Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66645-8
Ying-ze LIU , Ju-fu JIANG , Ying ZHANG , Min-jie HUANG , Jian DONG , Ying WANG
To form complex box-shape parts with large wall-thickness difference, a directly thixoforged technology of 2A14 alloy with low-cost and short-process was proposed and verified. The results showed that complex components were successfully thixoforged. Solid grains in the microstructure of the thixoforged parts exhibited a large deformation degree. This led to an obvious improvement in the mechanical properties of the thixoforged parts. No obvious liquid segregation was found in the microstructure. High mechanical properties were obtained in the thixoforged 2A14 alloy components. The yield strength varied from 157.1 to 187.3 MPa, the ultimate tensile strength varied from 268.2 to 316.6 MPa, and the elongation varied from 7.8% to 24.9%. Increase in plastic deformation degree caused by larger size and less round grains is beneficial to the mechanical properties of the thixoforged components.
{"title":"Microstructure and mechanical properties of directly thixoforged complex box-shape 2A14 part with large wall-thickness difference","authors":"Ying-ze LIU , Ju-fu JIANG , Ying ZHANG , Min-jie HUANG , Jian DONG , Ying WANG","doi":"10.1016/S1003-6326(24)66645-8","DOIUrl":"10.1016/S1003-6326(24)66645-8","url":null,"abstract":"<div><div>To form complex box-shape parts with large wall-thickness difference, a directly thixoforged technology of 2A14 alloy with low-cost and short-process was proposed and verified. The results showed that complex components were successfully thixoforged. Solid grains in the microstructure of the thixoforged parts exhibited a large deformation degree. This led to an obvious improvement in the mechanical properties of the thixoforged parts. No obvious liquid segregation was found in the microstructure. High mechanical properties were obtained in the thixoforged 2A14 alloy components. The yield strength varied from 157.1 to 187.3 MPa, the ultimate tensile strength varied from 268.2 to 316.6 MPa, and the elongation varied from 7.8% to 24.9%. Increase in plastic deformation degree caused by larger size and less round grains is beneficial to the mechanical properties of the thixoforged components.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3876-3892"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66644-6
Heng ZOU, Meng-xiong CHEN, Yang FU, Hui-wen XIONG, Lei ZHANG, Ke-chao ZHOU
Additives of dioctyl phthalate (DOP), ethylene bis-stearomide (EBS), and epoxy (EP) were selected to modify the surface of 7075 Al alloy powder. Functional groups in DOP and EBS form hydrogen bonds with hydroxyl groups on the surface of Al powder. Additionally, the epoxy groups in the epoxy resin undergo ring-opening reactions with hydroxyl groups. The above interactions increased the compatibility between alloy powder and polyoxymethylene (POM). After sintering, samples containing DOP and EP presented high contents of C and O, while the part with EBS additive exhibited the lowest contents of 0.006 wt.% C and 0.604 wt.% O, respectively. Excessive C tends to accumulate at grain boundaries during sintering. Concurrently, excessive O causes secondary oxidation of aluminium alloy powder, inhibiting the sintering densification process. Therefore, the densities of the samples containing DOP and EP were only 85.52% and 79.01%, respectively. In contrast, using EBS as an additive, high-quality aluminium alloy parts were achieved, with a relative density of 97.64% and a tensile strength of 193 MPa.
{"title":"Microstructure and mechanical properties of complex-shaped 7075 aluminium alloy prepared using modified polyoxymethylene-based feedstock","authors":"Heng ZOU, Meng-xiong CHEN, Yang FU, Hui-wen XIONG, Lei ZHANG, Ke-chao ZHOU","doi":"10.1016/S1003-6326(24)66644-6","DOIUrl":"10.1016/S1003-6326(24)66644-6","url":null,"abstract":"<div><div>Additives of dioctyl phthalate (DOP), ethylene bis-stearomide (EBS), and epoxy (EP) were selected to modify the surface of 7075 Al alloy powder. Functional groups in DOP and EBS form hydrogen bonds with hydroxyl groups on the surface of Al powder. Additionally, the epoxy groups in the epoxy resin undergo ring-opening reactions with hydroxyl groups. The above interactions increased the compatibility between alloy powder and polyoxymethylene (POM). After sintering, samples containing DOP and EP presented high contents of C and O, while the part with EBS additive exhibited the lowest contents of 0.006 wt.% C and 0.604 wt.% O, respectively. Excessive C tends to accumulate at grain boundaries during sintering. Concurrently, excessive O causes secondary oxidation of aluminium alloy powder, inhibiting the sintering densification process. Therefore, the densities of the samples containing DOP and EP were only 85.52% and 79.01%, respectively. In contrast, using EBS as an additive, high-quality aluminium alloy parts were achieved, with a relative density of 97.64% and a tensile strength of 193 MPa.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3862-3875"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66641-0
Zhu XIAO , Yan-jun DING , Ze-jun WANG , Yan-lin JIA , Yan-bin JIANG , Shen GONG , Zhou LI
Copper matrix composites (CMCs) offer promising applications by combining the functional characteristics of copper with composite phases. With the rapid advancement in aerospace, microelectronics, and intelligent terminal engineering, the demand for CMCs with superior mechanical and electrical properties has become increasingly critical. This paper reviews the design principles, preparation methods, microstructures and properties of some typical CMCs. The existing form of composite phases in the Cu matrix and their effects on microstructure evolution and comprehensive properties are summarised. Key underlying mechanisms governing these enhancements are discussed. The results provide a systematic understanding of the relationship between reinforcement phases and properties, offering insights for the future development of CMCs aimed to achieve much better comprehensive properties. The paper concludes by outlining the development trends and future outlook for the application of CMCs.
{"title":"Research and development of advanced copper matrix composites","authors":"Zhu XIAO , Yan-jun DING , Ze-jun WANG , Yan-lin JIA , Yan-bin JIANG , Shen GONG , Zhou LI","doi":"10.1016/S1003-6326(24)66641-0","DOIUrl":"10.1016/S1003-6326(24)66641-0","url":null,"abstract":"<div><div>Copper matrix composites (CMCs) offer promising applications by combining the functional characteristics of copper with composite phases. With the rapid advancement in aerospace, microelectronics, and intelligent terminal engineering, the demand for CMCs with superior mechanical and electrical properties has become increasingly critical. This paper reviews the design principles, preparation methods, microstructures and properties of some typical CMCs. The existing form of composite phases in the Cu matrix and their effects on microstructure evolution and comprehensive properties are summarised. Key underlying mechanisms governing these enhancements are discussed. The results provide a systematic understanding of the relationship between reinforcement phases and properties, offering insights for the future development of CMCs aimed to achieve much better comprehensive properties. The paper concludes by outlining the development trends and future outlook for the application of CMCs.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3789-3821"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66652-5
Ying-lin HU , Zi-luo CHENG , Xiao-na LI , Zhu-min LI , Yuan-di HOU , Min LI , Mian YANG , Yue-hong ZHENG , Chuang DONG
The segregation of Sn and discontinuous precipitation at grain boundaries are detrimental to the strength, ductility, and machinability of the Cu−Ni−Sn alloy. A strategy to solve the above problems is multi-component composition design by introducing strong enthalpic interaction element. In this work, a series of Cu80Ni15Sn5−xTix (at.%) alloys were designed by cluster-plus-glue-atom model, and the effects of Ti content on the microstructure and properties of the alloys were systematically investigated using TEM and other analysis methods. The results demonstrate that Ti can effectively inhibit the segregation and discontinuous precipitation while promoting continuous precipitation to improve the high-temperature stability of the alloys. As the Ti content increases, the distribution of Ti changes from uniform distribution to predominant precipitation. The hardness and conductivity of the alloy exceed those of the C72900 (Cu−15Ni−8Sn (wt.%)) commercial alloy and the Cu80Ni15Sn5 (at.%) reference alloy when Ti is in the solution state.
{"title":"Modulation of microstructure and properties of Cu−Ni−Sn alloy by addition of trace Ti","authors":"Ying-lin HU , Zi-luo CHENG , Xiao-na LI , Zhu-min LI , Yuan-di HOU , Min LI , Mian YANG , Yue-hong ZHENG , Chuang DONG","doi":"10.1016/S1003-6326(24)66652-5","DOIUrl":"10.1016/S1003-6326(24)66652-5","url":null,"abstract":"<div><div>The segregation of Sn and discontinuous precipitation at grain boundaries are detrimental to the strength, ductility, and machinability of the Cu−Ni−Sn alloy. A strategy to solve the above problems is multi-component composition design by introducing strong enthalpic interaction element. In this work, a series of Cu<sub>80</sub>Ni<sub>15</sub>Sn<sub>5−<em>x</em></sub>Ti<sub><em>x</em></sub> (at.%) alloys were designed by cluster-plus-glue-atom model, and the effects of Ti content on the microstructure and properties of the alloys were systematically investigated using TEM and other analysis methods. The results demonstrate that Ti can effectively inhibit the segregation and discontinuous precipitation while promoting continuous precipitation to improve the high-temperature stability of the alloys. As the Ti content increases, the distribution of Ti changes from uniform distribution to predominant precipitation. The hardness and conductivity of the alloy exceed those of the C72900 (Cu−15Ni−8Sn (wt.%)) commercial alloy and the Cu<sub>80</sub>Ni<sub>15</sub>Sn<sub>5</sub> (at.%) reference alloy when Ti is in the solution state.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3978-3991"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66656-2
Kang PENG, Ren-zhi LAI, Song LUO, Xi-bing LI
To study the influence of axial stress on the failure characteristics of deep arched roadway considering structural effect, true triaxial compression tests were conducted on cubic granite specimens with a three-centered arched hole structure. A video monitoring device was utilized to record the failure process of surrounding rocks. The test results show that under 10−60 MPa axial stress, the surrounding rock failure process included the calm stage, particle ejection stage, fragment ejection stage, and rock slice buckling and spalling stage. Under higher axial stresses (70 and 80 MPa), the failure process is characterized by violent fragment spray during the fourth stage. As the axial stress increases, the failure of surrounding rock increases, while the initial vertical failure stress first increases and then decreases. According to the failure characteristics of roadway under different axial stresses, arranging the roadway along the direction of a moderate axial stress level is desired.
{"title":"Influence of axial stress on failure characteristics of deep arched hard rock roadway","authors":"Kang PENG, Ren-zhi LAI, Song LUO, Xi-bing LI","doi":"10.1016/S1003-6326(24)66656-2","DOIUrl":"10.1016/S1003-6326(24)66656-2","url":null,"abstract":"<div><div>To study the influence of axial stress on the failure characteristics of deep arched roadway considering structural effect, true triaxial compression tests were conducted on cubic granite specimens with a three-centered arched hole structure. A video monitoring device was utilized to record the failure process of surrounding rocks. The test results show that under 10−60 MPa axial stress, the surrounding rock failure process included the calm stage, particle ejection stage, fragment ejection stage, and rock slice buckling and spalling stage. Under higher axial stresses (70 and 80 MPa), the failure process is characterized by violent fragment spray during the fourth stage. As the axial stress increases, the failure of surrounding rock increases, while the initial vertical failure stress first increases and then decreases. According to the failure characteristics of roadway under different axial stresses, arranging the roadway along the direction of a moderate axial stress level is desired.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 4032-4048"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66653-7
An-liang YE , Meng WANG , Yan-bin JIANG , Xiao-zan WU , Chao-qun PENG , Jin HE , Xiao-feng WANG
Stereolithography (SLA) combined with a two-step post-processing method “oxidation−reduction” was developed to fabricate pure copper with high complexity. The copper slurries for SLA were prepared, and particularly the influence of volume fraction of copper on the properties of copper slurries was investigated. In the two-step post-treatment process, organics were removed by oxidation and copper powder was oxidized simultaneously, and then the oxidized copper was reduced into highly reactive copper particles, improving the sintering activity of the copper green body and enhancing the relative density of the sintered part. The results show that curing depth of the copper slurries decreased with the increase of volume fraction of copper. The viscosity of the pure copper slurry rises exponentially as the volume fraction of copper exceeded 50%. The highest volume fraction of pure copper slurry for SLA is 55%. The specimens exhibited an increase in hardness and electrical conductivity with the increase of volume fraction of copper. Specifically, the maximum values of hardness and conductivity of samples with 55 vol.% copper were HV 52.7 and 57.1%(IACS), respectively.
{"title":"Additive manufacturing of pure copper via vat photopolymerization with slurry","authors":"An-liang YE , Meng WANG , Yan-bin JIANG , Xiao-zan WU , Chao-qun PENG , Jin HE , Xiao-feng WANG","doi":"10.1016/S1003-6326(24)66653-7","DOIUrl":"10.1016/S1003-6326(24)66653-7","url":null,"abstract":"<div><div>Stereolithography (SLA) combined with a two-step post-processing method “oxidation−reduction” was developed to fabricate pure copper with high complexity. The copper slurries for SLA were prepared, and particularly the influence of volume fraction of copper on the properties of copper slurries was investigated. In the two-step post-treatment process, organics were removed by oxidation and copper powder was oxidized simultaneously, and then the oxidized copper was reduced into highly reactive copper particles, improving the sintering activity of the copper green body and enhancing the relative density of the sintered part. The results show that curing depth of the copper slurries decreased with the increase of volume fraction of copper. The viscosity of the pure copper slurry rises exponentially as the volume fraction of copper exceeded 50%. The highest volume fraction of pure copper slurry for SLA is 55%. The specimens exhibited an increase in hardness and electrical conductivity with the increase of volume fraction of copper. Specifically, the maximum values of hardness and conductivity of samples with 55 vol.% copper were HV 52.7 and 57.1%(IACS), respectively.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3992-4004"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The high-temperature oxidation resistance of the nickel superalloy prepared by the laser powder bed fusion (LPBF) has been significantly increased as a result of in-situ formation of a thermal barrier layer (α-Al2O3 + CaMoO4) during oxidative annealing of surface layers modified by electric spark treatment (EST). The reactive EST of the LPBF-built items based on nickel EP741NP alloy was carried out with low-melting Al−12%Si, Al−6%Ca−0.6%Si and Al−7%Ca−1%Mn electrodes. It was found that under EST done by Al−7%Ca−1%Mn electrode an intermetallic (β-NiAl + γ’-Ni3Al) 15 μm-thick layer reinforced by spherical oxide (CaMe)O nanoparticles was formed. Formation of that structure increases the wear resistance of LPBF nickel superalloy by 4.5 times. Further oxidative annealing at 1000 °C leads to a formation of continuous two-layered coating with an inner layer of α-Al2O3 and an outer layer of CaMoO4, which together act as an effective barrier preventing the diffusion of oxygen into the bulk of the superalloy.
{"title":"Enhancing high-temperature oxidation resistance of nickel superalloy obtained by laser powder bed fusion via reactive electric spark treatment","authors":"S.K. MUKANOV, M.I. PETRZHIK, A.E. KUDRYASHOV, E.A. NAUMOVA, F.A. BASKOV, P.A. LOGINOV, E.A. LEVASHOV","doi":"10.1016/S1003-6326(24)66649-5","DOIUrl":"10.1016/S1003-6326(24)66649-5","url":null,"abstract":"<div><div>The high-temperature oxidation resistance of the nickel superalloy prepared by the laser powder bed fusion (LPBF) has been significantly increased as a result of in-situ formation of a thermal barrier layer (<em>α</em>-Al<sub>2</sub>O<sub>3</sub> + CaMoO<sub>4</sub>) during oxidative annealing of surface layers modified by electric spark treatment (EST). The reactive EST of the LPBF-built items based on nickel EP741NP alloy was carried out with low-melting Al−12%Si, Al−6%Ca−0.6%Si and Al−7%Ca−1%Mn electrodes. It was found that under EST done by Al−7%Ca−1%Mn electrode an intermetallic (<em>β</em>-NiAl + <em>γ’</em>-Ni<sub>3</sub>Al) 15 μm-thick layer reinforced by spherical oxide (CaMe)O nanoparticles was formed. Formation of that structure increases the wear resistance of LPBF nickel superalloy by 4.5 times. Further oxidative annealing at 1000 °C leads to a formation of continuous two-layered coating with an inner layer of <em>α</em>-Al<sub>2</sub>O<sub>3</sub> and an outer layer of CaMoO<sub>4</sub>, which together act as an effective barrier preventing the diffusion of oxygen into the bulk of the superalloy.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3935-3948"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
7075-T6 aluminum alloy/low carbon steel joint was carried out via a novel friction plug−riveting spot welding process. This process utilized uniquely designed steel rivets with a tip and groove shape. The macro- morphology formation, microstructure, microhardness and lap shear performance of joints were investigated. As the spindle down distance increased, the rivet tip was friction welded with the lower steel sheet, resulting in the formation of a solid phase welding zone exhibiting metallurgical bonding. Additionally, a hook was formed in the joint, providing the mechanical locking. The results showed that under optimal parameters of spindle down distance of 3.4 mm, rotation speed of 4000 r/min, and spindle down speed of 2.4 mm/s, the lap shear load of the joints reached a maximum of 14.36 kN. Failure occurred at the aluminum alloy base metal.
{"title":"Friction plug−riveting spot welding of AA 7075-T6 aluminum alloy and low carbon steel using 1045 steel rivet","authors":"Ya-jia LIU, Jian-yu LI, Ze-hao XIE, Shu-hai CHEN, Jian YANG, Ji-hua HUANG, Zhi-yi ZHAO","doi":"10.1016/S1003-6326(24)66646-X","DOIUrl":"10.1016/S1003-6326(24)66646-X","url":null,"abstract":"<div><div>7075-T6 aluminum alloy/low carbon steel joint was carried out via a novel friction plug−riveting spot welding process. This process utilized uniquely designed steel rivets with a tip and groove shape. The macro- morphology formation, microstructure, microhardness and lap shear performance of joints were investigated. As the spindle down distance increased, the rivet tip was friction welded with the lower steel sheet, resulting in the formation of a solid phase welding zone exhibiting metallurgical bonding. Additionally, a hook was formed in the joint, providing the mechanical locking. The results showed that under optimal parameters of spindle down distance of 3.4 mm, rotation speed of 4000 r/min, and spindle down speed of 2.4 mm/s, the lap shear load of the joints reached a maximum of 14.36 kN. Failure occurred at the aluminum alloy base metal.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3893-3904"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66642-2
Wu-bin QI, Jia-qi WU, Zhuan LI, Peng XIAO, Jun-jie DUAN, Yang-jie LI, Liang PANG, Zong-long GAO, Jia-min ZHU, Yang LI
Carbon fiber reinforced silicon carbide ceramic composite (C/SiC) has become a key structural material due to its excellent high temperature resistance, corrosion resistance and oxidation resistance. However, C/SiC composites are prone to oxidation under long-term high temperature loading conditions. In this work, the research progress of SiC coating and its modified coating on the surface of C/SiC composite is reviewed. The optimization of these coatings mainly involves two aspects: structure and composition. The focus of structural optimization is to improve the interphase structure by such as SiC nanowires, thereby improving the interfacial bonding strength between the coatings and between the coatings and the substrate. The focus of composition optimization is to improve the performance of the coatings under high temperature loads by rare earth silicates, etc. The modification strategies of various modified coatings are emphatically introduced, which is helpful to guide the preparation of high-performance C/SiC coating materials in the future.
{"title":"Research progress on silicon carbide and its modified coatings in C/SiC composites","authors":"Wu-bin QI, Jia-qi WU, Zhuan LI, Peng XIAO, Jun-jie DUAN, Yang-jie LI, Liang PANG, Zong-long GAO, Jia-min ZHU, Yang LI","doi":"10.1016/S1003-6326(24)66642-2","DOIUrl":"10.1016/S1003-6326(24)66642-2","url":null,"abstract":"<div><div>Carbon fiber reinforced silicon carbide ceramic composite (C/SiC) has become a key structural material due to its excellent high temperature resistance, corrosion resistance and oxidation resistance. However, C/SiC composites are prone to oxidation under long-term high temperature loading conditions. In this work, the research progress of SiC coating and its modified coating on the surface of C/SiC composite is reviewed. The optimization of these coatings mainly involves two aspects: structure and composition. The focus of structural optimization is to improve the interphase structure by such as SiC nanowires, thereby improving the interfacial bonding strength between the coatings and between the coatings and the substrate. The focus of composition optimization is to improve the performance of the coatings under high temperature loads by rare earth silicates, etc. The modification strategies of various modified coatings are emphatically introduced, which is helpful to guide the preparation of high-performance C/SiC coating materials in the future.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 3822-3845"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143200896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/S1003-6326(24)66660-4
Nan HU , Ai-shu LI , Huang YU , Yu-long LIU , Hui ZHANG , Zhi-hui YANG , Guang-yue LI , De-xin DING
A strain of Klebsiella aerogenes (K. aerogenes) capable of decomposing calcium acetate for CaCO3 biomineralization was screened, and the optimum conditions for producing the maximum mass of CaCO3 crystals induced by Klebsiella aerogenes were found to be 0.25 mol/L calcium acetate, 4% inoculum level, and pH 7. Following that, the monosaccharides and proteins contained in the extracellular polymeric substances (EPS) of Klebsiella aerogenes were identified. The effects of additional identified monosaccharide and proteins on the crystalline form conversion of CaCO3 crystals were investigated, and the additional monosaccharides were found to promote the crystalline form conversion of CaCO3 crystals from vaterite to calcite. Specifically, adding 1.00 g/L glucuronic acid was observed to enhance the conversion of crystalline phases of CaCO3 crystals to calcite completely after 5 d. Meanwhile, additional catalase was observed to contribute to the regular morphology of CaCO3 crystals without affecting their crystalline phases. The results indicate that the additional glucuronic acid influences the crystalline forms of CaCO3 crystals significantly.
{"title":"Effects of monosaccharides and protein in extracellular polymeric substances of Klebsiella aerogenes on crystalline forms of CaCO3 crystals","authors":"Nan HU , Ai-shu LI , Huang YU , Yu-long LIU , Hui ZHANG , Zhi-hui YANG , Guang-yue LI , De-xin DING","doi":"10.1016/S1003-6326(24)66660-4","DOIUrl":"10.1016/S1003-6326(24)66660-4","url":null,"abstract":"<div><div>A strain of <em>Klebsiella aerogenes</em> (<em>K. aerogenes</em>) capable of decomposing calcium acetate for CaCO<sub>3</sub> biomineralization was screened, and the optimum conditions for producing the maximum mass of CaCO<sub>3</sub> crystals induced by <em>Klebsiella aerogenes</em> were found to be 0.25 mol/L calcium acetate, 4% inoculum level, and pH 7. Following that, the monosaccharides and proteins contained in the extracellular polymeric substances (EPS) of <em>Klebsiella aerogenes</em> were identified. The effects of additional identified monosaccharide and proteins on the crystalline form conversion of CaCO<sub>3</sub> crystals were investigated, and the additional monosaccharides were found to promote the crystalline form conversion of CaCO<sub>3</sub> crystals from vaterite to calcite. Specifically, adding 1.00 g/L glucuronic acid was observed to enhance the conversion of crystalline phases of CaCO<sub>3</sub> crystals to calcite completely after 5 d. Meanwhile, additional catalase was observed to contribute to the regular morphology of CaCO<sub>3</sub> crystals without affecting their crystalline phases. The results indicate that the additional glucuronic acid influences the crystalline forms of CaCO<sub>3</sub> crystals significantly.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 12","pages":"Pages 4085-4098"},"PeriodicalIF":4.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143201086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号