Pub Date : 2023-05-19DOI: 10.1080/17436753.2023.2230008
Zhengzheng Wang, I. Zhitomirsky
ABSTRACT This investigation is motivated by increasing interest in polymer-diamond coatings for biomedical applications in implants and sensors. A conceptually new strategy is based on the feasibility of solubilisation of polyethyl methacrylate (PEMA) in isopropanol using 18β-glycyrrhetinic acid (GRA) and rhamnolipids (RLP) as solubilising agents. This approach offers benefits for biomedical applications by avoiding the use of traditional toxic solvents for PEMA dissolution. The ability to obtain concentrated solutions of high molecular mass polymer is a crucial factor for the development of a dip coating method. Potentiodynamic and impedance spectroscopy studies indicate that PEMA films provide corrosion protection of stainless steel in 3% NaCl solutions. The use of GRA facilitates the fabrication of films with improved protective properties. PEMA films are obtained as monolayers or multilayers of controlled film mass. Another important finding is a good dispersion of chemically inert microdiamond and nanodiamond particles using GRA and RLP. For the first time composite PEMA-diamond films are obtained using GRA and RLP as solubilising agents for PEMA and dispersing agents for diamonds in isopropanol solvent. The detailed analysis of film microstructures provides an insight into the influence of chemical structure of GRA and RLP on their interactions with PEMA and diamonds. Moreover, microstructure analysis indicates that such interactions are important for preventing defects in the composite films. The benefits of steroid-like dispersants are discussed. Composite films are obtained as monolayers with different diamond content or PEMA-diamond multilayers of different composition and film mass. The method represents a versatile strategy for the fabrication of alternating PEMA/PEMA-diamond multilayers. The benefits of the obtained microstructures for biomedical applications are discussed. The approach developed in this investigation opens an avenue for the fabrication of other polymer coatings containing various functional materials. GRAPHICAL ABSTRACT
{"title":"Surfactant assisted dip-coating method for deposition of polyethylmethacrylate-diamond coatings","authors":"Zhengzheng Wang, I. Zhitomirsky","doi":"10.1080/17436753.2023.2230008","DOIUrl":"https://doi.org/10.1080/17436753.2023.2230008","url":null,"abstract":"ABSTRACT This investigation is motivated by increasing interest in polymer-diamond coatings for biomedical applications in implants and sensors. A conceptually new strategy is based on the feasibility of solubilisation of polyethyl methacrylate (PEMA) in isopropanol using 18β-glycyrrhetinic acid (GRA) and rhamnolipids (RLP) as solubilising agents. This approach offers benefits for biomedical applications by avoiding the use of traditional toxic solvents for PEMA dissolution. The ability to obtain concentrated solutions of high molecular mass polymer is a crucial factor for the development of a dip coating method. Potentiodynamic and impedance spectroscopy studies indicate that PEMA films provide corrosion protection of stainless steel in 3% NaCl solutions. The use of GRA facilitates the fabrication of films with improved protective properties. PEMA films are obtained as monolayers or multilayers of controlled film mass. Another important finding is a good dispersion of chemically inert microdiamond and nanodiamond particles using GRA and RLP. For the first time composite PEMA-diamond films are obtained using GRA and RLP as solubilising agents for PEMA and dispersing agents for diamonds in isopropanol solvent. The detailed analysis of film microstructures provides an insight into the influence of chemical structure of GRA and RLP on their interactions with PEMA and diamonds. Moreover, microstructure analysis indicates that such interactions are important for preventing defects in the composite films. The benefits of steroid-like dispersants are discussed. Composite films are obtained as monolayers with different diamond content or PEMA-diamond multilayers of different composition and film mass. The method represents a versatile strategy for the fabrication of alternating PEMA/PEMA-diamond multilayers. The benefits of the obtained microstructures for biomedical applications are discussed. The approach developed in this investigation opens an avenue for the fabrication of other polymer coatings containing various functional materials. GRAPHICAL ABSTRACT","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80909144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/17436753.2023.2236888
G. Fisher, D. Diaz
ABSTRACT The Albertan oil sands surface mining industry recovers and processes large quantities of ore to remove the bitumen from the oil sands. The scale of the operations and the abrasive nature of the ore results in very aggressive wear conditions. The high levels of abrasive and impact wear can lead to equipment reliability issues, with associated costs and lost production. As such, it is common to augment the durability of mining components by the application of wear-resistant materials. For critical equipment tungsten carbide-based composite overlays are commonly selected to improve reliability and extend service life. The performance of the overlay is very much dependent on the service conditions. This paper will describe how the selection of tungsten carbide-type can determine the performance of a composite overlay in a range of abrasive and impact wear conditions. The paper will demonstrate how the effective selection of the composite to match the expected service conditions can improve the durability of mining equipment.
{"title":"The design and selection of tungsten carbide-based composite overlays for aggressive wear service conditions","authors":"G. Fisher, D. Diaz","doi":"10.1080/17436753.2023.2236888","DOIUrl":"https://doi.org/10.1080/17436753.2023.2236888","url":null,"abstract":"ABSTRACT The Albertan oil sands surface mining industry recovers and processes large quantities of ore to remove the bitumen from the oil sands. The scale of the operations and the abrasive nature of the ore results in very aggressive wear conditions. The high levels of abrasive and impact wear can lead to equipment reliability issues, with associated costs and lost production. As such, it is common to augment the durability of mining components by the application of wear-resistant materials. For critical equipment tungsten carbide-based composite overlays are commonly selected to improve reliability and extend service life. The performance of the overlay is very much dependent on the service conditions. This paper will describe how the selection of tungsten carbide-type can determine the performance of a composite overlay in a range of abrasive and impact wear conditions. The paper will demonstrate how the effective selection of the composite to match the expected service conditions can improve the durability of mining equipment.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83019915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/17436753.2023.2233242
J. Billman, I. Reimanis, A. Ambrosini, G. Jackson
ABSTRACT CuCr2O4 spinel is a candidate coating material for central receivers in concentrating solar power to protect structural alloys against high temperature oxidation and related degradation. Coating performance and microstructure of dip-coated and sintered coatings is dictated by the initial particle size of the CuCr2O4 and sintering temperature, but can be compromised by particle agglomeration. In this study, sub-micron particles were synthesised through the Pechini and modified Pechini sol–gel methods. Phase composition was confirmed via X-ray diffraction. Particle growth during calcination of the nanoparticles at different temperatures (650°C, 750°C, 850°C) and times (between 1 and 24 h) was measured via laser diffraction and scanning electron microscopy. The modified Pechini method displayed evidence of smaller particle sizes and greater agglomeration. The kinetics of particle growth observed are consistent with a diffusion limited inhibited grain growth model.
{"title":"CuCr2O4 particle growth and evolution across sol–gel routes and calcination profiles","authors":"J. Billman, I. Reimanis, A. Ambrosini, G. Jackson","doi":"10.1080/17436753.2023.2233242","DOIUrl":"https://doi.org/10.1080/17436753.2023.2233242","url":null,"abstract":"ABSTRACT CuCr2O4 spinel is a candidate coating material for central receivers in concentrating solar power to protect structural alloys against high temperature oxidation and related degradation. Coating performance and microstructure of dip-coated and sintered coatings is dictated by the initial particle size of the CuCr2O4 and sintering temperature, but can be compromised by particle agglomeration. In this study, sub-micron particles were synthesised through the Pechini and modified Pechini sol–gel methods. Phase composition was confirmed via X-ray diffraction. Particle growth during calcination of the nanoparticles at different temperatures (650°C, 750°C, 850°C) and times (between 1 and 24 h) was measured via laser diffraction and scanning electron microscopy. The modified Pechini method displayed evidence of smaller particle sizes and greater agglomeration. The kinetics of particle growth observed are consistent with a diffusion limited inhibited grain growth model.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88514337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/17436753.2023.2235491
L. Ćurković, D. Landek, Zrinka Švagelj, Ivan Gabelica
ABSTRACT The volume erosion rate of the slip cast monolithic and composite ceramics was studied using SiO2 and SiC particles as erodents, under different impact angles (30°, 60°, 90°), at room temperature. Therefore, three groups of samples were prepared: (i) monolithic alumina (Al2O3); (ii) composite alumina–zirconia (Al2O3–ZrO2) containing 99 wt-% Al2O3 and 1 wt-% ZrO2 and (iii) composite alumina–zirconia (Al2O3–ZrO2) containing 90 wt-% Al2O3 and 10 wt-% ZrO2. Erosion mechanisms of all prepared ceramic samples were evaluated by the volume erosion rate ( , mm3·g–1). Obtained results were compared with the analytical Wiederhorn and Evans equations. The mechanical properties (hardness and fracture toughness) of prepared ceramic samples were compared with their under the above-mentioned conditions. It was found that the erosion of monolithic and composite ceramics increased with the increase of the impact angle. Volume erosion rate was highest at an impact angle of 90° and amounts to 115 mm3·g–1 with SiC, and 12 mm3·g–1 with SiO2 erodent particles for monolithic alumina ceramics, 77 mm3·g–1 with SiC, and 8 mm3·g–1 with SiO2 erodent particles for ceramics with the addition of 1 wt-% of ZrO2, and 61 mm3·g–1 with SiC, and 7 mm3·g–1 with SiO2 erodent particles for ceramics with the addition of 10 wt-% of ZrO2. Therefore, it can be concluded that the erosion resistance of monolithic Al2O3 increases with the increasing amount of ZrO2 in the composite Al2O3-ZrO2 ceramics, thus erosion resistance can be improved with the addition of ZrO2.
{"title":"The volume erosion rate of the slip cast monolithic and composite ceramics","authors":"L. Ćurković, D. Landek, Zrinka Švagelj, Ivan Gabelica","doi":"10.1080/17436753.2023.2235491","DOIUrl":"https://doi.org/10.1080/17436753.2023.2235491","url":null,"abstract":"ABSTRACT The volume erosion rate of the slip cast monolithic and composite ceramics was studied using SiO2 and SiC particles as erodents, under different impact angles (30°, 60°, 90°), at room temperature. Therefore, three groups of samples were prepared: (i) monolithic alumina (Al2O3); (ii) composite alumina–zirconia (Al2O3–ZrO2) containing 99 wt-% Al2O3 and 1 wt-% ZrO2 and (iii) composite alumina–zirconia (Al2O3–ZrO2) containing 90 wt-% Al2O3 and 10 wt-% ZrO2. Erosion mechanisms of all prepared ceramic samples were evaluated by the volume erosion rate ( , mm3·g–1). Obtained results were compared with the analytical Wiederhorn and Evans equations. The mechanical properties (hardness and fracture toughness) of prepared ceramic samples were compared with their under the above-mentioned conditions. It was found that the erosion of monolithic and composite ceramics increased with the increase of the impact angle. Volume erosion rate was highest at an impact angle of 90° and amounts to 115 mm3·g–1 with SiC, and 12 mm3·g–1 with SiO2 erodent particles for monolithic alumina ceramics, 77 mm3·g–1 with SiC, and 8 mm3·g–1 with SiO2 erodent particles for ceramics with the addition of 1 wt-% of ZrO2, and 61 mm3·g–1 with SiC, and 7 mm3·g–1 with SiO2 erodent particles for ceramics with the addition of 10 wt-% of ZrO2. Therefore, it can be concluded that the erosion resistance of monolithic Al2O3 increases with the increasing amount of ZrO2 in the composite Al2O3-ZrO2 ceramics, thus erosion resistance can be improved with the addition of ZrO2.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78643074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-19DOI: 10.1080/17436753.2023.2238980
S. Ueno, T. Ohji
ABSTRACT This review article outlines the authors’ previous works on environmental barrier coatings (EBC) for non-oxide ceramics and discusses what has been revealed since then. It also provides an overview of the research on eutectic coatings as EBC's that has been carried out in recent years. The authors have developed EBC for Lu2O3-doped silicon nitride ceramics. Since preliminary material screening tests revealed that Lu2Si2O7 phase has superior resistance against water vapour corrosion, the development was carried out mainly on EBC's based on this phase. This review addresses recession behaviours in static state and dynamic steam jet water vapour environments for some oxides, as well as under steam jet test for silicon nitride ceramics with EBC's, in addition to fabrication of EBC's with oxides eutectic structure. One example of the authors’ works is described here, since it can fabricate a crack-free Al2O3–HfO2 eutectic coating.
{"title":"Development of environmental barrier coatings for non-oxide ceramics","authors":"S. Ueno, T. Ohji","doi":"10.1080/17436753.2023.2238980","DOIUrl":"https://doi.org/10.1080/17436753.2023.2238980","url":null,"abstract":"ABSTRACT This review article outlines the authors’ previous works on environmental barrier coatings (EBC) for non-oxide ceramics and discusses what has been revealed since then. It also provides an overview of the research on eutectic coatings as EBC's that has been carried out in recent years. The authors have developed EBC for Lu2O3-doped silicon nitride ceramics. Since preliminary material screening tests revealed that Lu2Si2O7 phase has superior resistance against water vapour corrosion, the development was carried out mainly on EBC's based on this phase. This review addresses recession behaviours in static state and dynamic steam jet water vapour environments for some oxides, as well as under steam jet test for silicon nitride ceramics with EBC's, in addition to fabrication of EBC's with oxides eutectic structure. One example of the authors’ works is described here, since it can fabricate a crack-free Al2O3–HfO2 eutectic coating.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91180567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-17DOI: 10.1080/17436753.2023.2199554
Diwakar Makireddi, V. D. Ghuge, Alok Behera, Y. Puri, G. Thakare, M. M. Thawre
ABSTRACT Using a conventional sintering (CS) process, it is difficult to eliminate pore distribution across ceramic composites, resulting in mechanical properties destruction. In this study, 90%–95% of pores were reduced with the same sintering parameters by replacing CS with the cutting-edge Alumina-Graphite Powder Bath (AGPB) sintering method. Alumina-Zirconia-CNT(AZC) composites were fabricated using both AGPB and CS methods. The ceramic samples were surrounded by alumina-graphite powder particles in the AGPB method, which provided indirect homogeneous heating to the samples. This powder bath setup changed convection-radiation heat to conduction heat and produced sintered product with pore-free microstructures. The hardness of the AGPB-AZC composite was 43% higher than the CS-AZC, demonstrating the exponential property enhancement caused by cutting-edge AGPB sintering. The AGPB-AZC FESEM investigation revealed the formation of a homogenous microstructure with minimum pores, which eventually increased the hardness.
{"title":"Enhancing the hardness of alumina-zirconia-CNT composites using alumina-graphite powder bath to provide homogeneous sintering","authors":"Diwakar Makireddi, V. D. Ghuge, Alok Behera, Y. Puri, G. Thakare, M. M. Thawre","doi":"10.1080/17436753.2023.2199554","DOIUrl":"https://doi.org/10.1080/17436753.2023.2199554","url":null,"abstract":"ABSTRACT Using a conventional sintering (CS) process, it is difficult to eliminate pore distribution across ceramic composites, resulting in mechanical properties destruction. In this study, 90%–95% of pores were reduced with the same sintering parameters by replacing CS with the cutting-edge Alumina-Graphite Powder Bath (AGPB) sintering method. Alumina-Zirconia-CNT(AZC) composites were fabricated using both AGPB and CS methods. The ceramic samples were surrounded by alumina-graphite powder particles in the AGPB method, which provided indirect homogeneous heating to the samples. This powder bath setup changed convection-radiation heat to conduction heat and produced sintered product with pore-free microstructures. The hardness of the AGPB-AZC composite was 43% higher than the CS-AZC, demonstrating the exponential property enhancement caused by cutting-edge AGPB sintering. The AGPB-AZC FESEM investigation revealed the formation of a homogenous microstructure with minimum pores, which eventually increased the hardness.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78904524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT The major objective of the work is to explore the mechanical properties of biphasic calcium phosphates (BCP), a biomaterial derived from marine resources like prawn (Fenneropenaeus Indicus) shell biowaste through wet chemical treatment of CaO. We report the BCP, a mixture of hydroxyapatite and octa calcium phosphate from prawn shell biowaste using wet chemical synthesis at 80°C under pH 10. XRD of BCP revealed the coexistence of secondary phases like β-TCP and α-TCP along with HA upon sintering at different temperatures. Furthermore, the SEM and EDS opened well-sintered uniaxial grains and the presence of trace elements like Fe, Mg, Si, and Na. The specimens sintered at 1100°C showed the highest compression strength of 56.8 MPa due to MgO at the grain boundaries, which plays an important role in grain boundary diffusion. Therefore, the prawn shell biowaste-derived BCP has good mechanical properties, making them suitable materials for high-strength bone substitutes.
{"title":"Preparation and structural characteristics of biphasic calcium phosphates from prawn shell bio-waste","authors":"Perabathula Satish, Ashritha Salian, Komalakrushna Hadagalli, Saumen Mandal","doi":"10.1080/17436753.2023.2231701","DOIUrl":"https://doi.org/10.1080/17436753.2023.2231701","url":null,"abstract":"ABSTRACT The major objective of the work is to explore the mechanical properties of biphasic calcium phosphates (BCP), a biomaterial derived from marine resources like prawn (Fenneropenaeus Indicus) shell biowaste through wet chemical treatment of CaO. We report the BCP, a mixture of hydroxyapatite and octa calcium phosphate from prawn shell biowaste using wet chemical synthesis at 80°C under pH 10. XRD of BCP revealed the coexistence of secondary phases like β-TCP and α-TCP along with HA upon sintering at different temperatures. Furthermore, the SEM and EDS opened well-sintered uniaxial grains and the presence of trace elements like Fe, Mg, Si, and Na. The specimens sintered at 1100°C showed the highest compression strength of 56.8 MPa due to MgO at the grain boundaries, which plays an important role in grain boundary diffusion. Therefore, the prawn shell biowaste-derived BCP has good mechanical properties, making them suitable materials for high-strength bone substitutes.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88667362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17436753.2023.2172649
Lv Changhai, Li Jing, Tian Shouxin, Lv Renxiang
ABSTRACT In this paper, the oxidation resistance of magnesia carbon bricks with different compositions was evaluated and the influencing factors were obtained, the influence of oxidation resistance on the performance of magnesia carbon bricks was investigated. The test results showed that for low-carbon MgO-C refractories, the influence of holding time was greater than that of oxidation temperature; for medium and high carbon MgO-C refractories, the influence of oxidation temperature was greater than that of holding times. The oxidation resistance of refractories, especially that of low-carbon MgO-C refractories, improved with the increase of the content of metallic additives. The oxidation resistance improved with the increase of graphite purity, especially in the low-temperature region. It is expected that this study can contribute to the optimal selection of magnesia carbon bricks in the trunnion area of furnace lining and provide a reference for the design of refractories with long overall service life.
{"title":"Oxidation resistance of magnesia carbon bricks and the influence on their performance","authors":"Lv Changhai, Li Jing, Tian Shouxin, Lv Renxiang","doi":"10.1080/17436753.2023.2172649","DOIUrl":"https://doi.org/10.1080/17436753.2023.2172649","url":null,"abstract":"ABSTRACT In this paper, the oxidation resistance of magnesia carbon bricks with different compositions was evaluated and the influencing factors were obtained, the influence of oxidation resistance on the performance of magnesia carbon bricks was investigated. The test results showed that for low-carbon MgO-C refractories, the influence of holding time was greater than that of oxidation temperature; for medium and high carbon MgO-C refractories, the influence of oxidation temperature was greater than that of holding times. The oxidation resistance of refractories, especially that of low-carbon MgO-C refractories, improved with the increase of the content of metallic additives. The oxidation resistance improved with the increase of graphite purity, especially in the low-temperature region. It is expected that this study can contribute to the optimal selection of magnesia carbon bricks in the trunnion area of furnace lining and provide a reference for the design of refractories with long overall service life.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88620405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17436753.2023.2192079
A. Dmitrievskiy, D. G. Zhigacheva, Grigory V. Grigoriev
ABSTRACT The paper studies the structural features, phase composition and complex mechanical properties of two-layer composite ceramics based on alumina-toughened zirconia with silica added (Ca-ATZ/Ca-ATZ+SiO2). The ceramics under study were manufactured using a cost-effective technology involving grinding and mixing powders, layering of powder mixtures (different compositions), uniaxial pressing and two-stage sintering. It was found that at the interface of the compositions, there is an abrupt increase in fracture toughness (by 33%) and a decrease in hardness and Young’s modulus (by 8% and 7%, respectively). The possibility of manufacturing composite ceramics Ca-ATZ+SiO2 (with a thin surface layer, not containing SiO2) with a high ratio of hardness (not lower than 14 GPa) and fracture toughness (not lower than 12 MPa m1/2) was shown. Given the increased resistance to low-temperature degradation of the developed ceramics, this will increase the service life of products operated under high mechanical loads in a humid atmosphere.
{"title":"Ca-ATZ/Ca-ATZ+SiO2 functionally graded ceramic","authors":"A. Dmitrievskiy, D. G. Zhigacheva, Grigory V. Grigoriev","doi":"10.1080/17436753.2023.2192079","DOIUrl":"https://doi.org/10.1080/17436753.2023.2192079","url":null,"abstract":"ABSTRACT The paper studies the structural features, phase composition and complex mechanical properties of two-layer composite ceramics based on alumina-toughened zirconia with silica added (Ca-ATZ/Ca-ATZ+SiO2). The ceramics under study were manufactured using a cost-effective technology involving grinding and mixing powders, layering of powder mixtures (different compositions), uniaxial pressing and two-stage sintering. It was found that at the interface of the compositions, there is an abrupt increase in fracture toughness (by 33%) and a decrease in hardness and Young’s modulus (by 8% and 7%, respectively). The possibility of manufacturing composite ceramics Ca-ATZ+SiO2 (with a thin surface layer, not containing SiO2) with a high ratio of hardness (not lower than 14 GPa) and fracture toughness (not lower than 12 MPa m1/2) was shown. Given the increased resistance to low-temperature degradation of the developed ceramics, this will increase the service life of products operated under high mechanical loads in a humid atmosphere.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76238937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17436753.2023.2192077
Anil Painuly, B. George, K. Prabhakaran
ABSTRACT In this study, aluminosilicate fiber-embedded SiBOC matrix composite foams are realised by a simple, cost-effective and easily scalable method. Aluminosilicate wool is transformed into a compressible preform using polyvinyl alcohol as a binder. The preforms are impregnated with methylvinylborosiloxane (MVBS), followed by heat treatment at 1400°C in an inert atmosphere. The composite foam’s density, compressive strength and thermal conductivity are modulated in the ranges 0.71–0.46 g/cc, 0.79–0.39 MPa and 0.21–0.13 Wm−1K−1, respectively, by varying MVBS concentration from 29 to 54 wt.%. While the incorporation of aluminosilicate fibers was observed to lower the thermal conductivity of the composite foams, it did not contribute to their compressive strength. Exposure of the foams to air at 1300°C for 90 min didn’t change their density, while it increased the compressive strength by up to 46% due to improved fiber-matrix adhesion and rounding of cracks.
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