Pub Date : 2022-11-17DOI: 10.1080/17436753.2023.2170618
Cristian Casut, R. Bucur, N. Miclău, I. Malaescu, M. Miclau
ABSTRACT From a new perspective, polymorphism is now often considered as a functional property that extends the applications of many materials. BiFeO3 is still an interesting material from both fundamental and applied points of view. A unique characteristic of BiFeO3 film, the polymorphism was stabilised only using the epitaxial strain caused by the substrate of the film. Here we report the hydrothermal synthesis of biphasic BiFeO3 ceramics using low NaOH concentration and temperature. The ability of BiFeO3 ceramics to morph into tetragonal and rhombohedral allotropic phases was demonstrated, confirming the theoretical prediction that the polymorphism can be stabilised even in powder form. Based on our experimental study NaOH(aq) is proposed as responsible for the strain on the structure of the rhombohedral phase. In addition, the in-depth characterisation of this biphasic ceramic opens up new opportunities for the technological applications of BiFeO3 material.
{"title":"Biphasic BiFeO3 ceramics based on rhombohedral and tetragonal polymorphs","authors":"Cristian Casut, R. Bucur, N. Miclău, I. Malaescu, M. Miclau","doi":"10.1080/17436753.2023.2170618","DOIUrl":"https://doi.org/10.1080/17436753.2023.2170618","url":null,"abstract":"ABSTRACT From a new perspective, polymorphism is now often considered as a functional property that extends the applications of many materials. BiFeO3 is still an interesting material from both fundamental and applied points of view. A unique characteristic of BiFeO3 film, the polymorphism was stabilised only using the epitaxial strain caused by the substrate of the film. Here we report the hydrothermal synthesis of biphasic BiFeO3 ceramics using low NaOH concentration and temperature. The ability of BiFeO3 ceramics to morph into tetragonal and rhombohedral allotropic phases was demonstrated, confirming the theoretical prediction that the polymorphism can be stabilised even in powder form. Based on our experimental study NaOH(aq) is proposed as responsible for the strain on the structure of the rhombohedral phase. In addition, the in-depth characterisation of this biphasic ceramic opens up new opportunities for the technological applications of BiFeO3 material.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74314494","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 Carbon fibre-reinforced carbon aerogel composites (C/CAs) were prepared by using polyacrylonitrile (PAN) and phenolic (PH) carbon precursor fibres as reinforcements, respectively, then impregnated with resorcinol-formaldehyde sol, aging, solvent exchanging, CO2 supercritical drying and carbonization at 1000°C. The physical properties, structural morphology and mechanical and thermal insulation behaviour of the two kinds of composites were further compared. Pore structure analysis shows that the PH-based C/CAs have a larger specific surface area (438.92 m2·g−1) and richer mesoporous volume than the PAN-based C/CAs. Mechanical behaviour of the C/CAs has been changed, but the stronger enhancement effects belong to PAN-based C/CAs (compressive strength in xy and z-directions are 1.63±0.10 MPa and 1.22±0.19 MPa, bending strength is 3.62±0.50 MPa). However, the PH-based C/CA composites have relatively low thermal conductivities, ranging from 0.027 to 0.164 W·m−1·K−1 between 25 and 1800°C.
{"title":"Mechanical and thermal insulation properties of carbon fibre-reinforced carbon aerogel composites","authors":"Longlong Li, Junzong Feng, Fengqi Liu, Liangjun Li, Yonggang Jiang, Jian Feng","doi":"10.1080/17436753.2022.2156163","DOIUrl":"https://doi.org/10.1080/17436753.2022.2156163","url":null,"abstract":"ABSTRACT Carbon fibre-reinforced carbon aerogel composites (C/CAs) were prepared by using polyacrylonitrile (PAN) and phenolic (PH) carbon precursor fibres as reinforcements, respectively, then impregnated with resorcinol-formaldehyde sol, aging, solvent exchanging, CO2 supercritical drying and carbonization at 1000°C. The physical properties, structural morphology and mechanical and thermal insulation behaviour of the two kinds of composites were further compared. Pore structure analysis shows that the PH-based C/CAs have a larger specific surface area (438.92 m2·g−1) and richer mesoporous volume than the PAN-based C/CAs. Mechanical behaviour of the C/CAs has been changed, but the stronger enhancement effects belong to PAN-based C/CAs (compressive strength in xy and z-directions are 1.63±0.10 MPa and 1.22±0.19 MPa, bending strength is 3.62±0.50 MPa). However, the PH-based C/CA composites have relatively low thermal conductivities, ranging from 0.027 to 0.164 W·m−1·K−1 between 25 and 1800°C.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90533422","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 : 2022-11-07DOI: 10.1080/17436753.2022.2141994
L. Pardo, A. González, J. Bartolomé, P. Ochoa
This special issue of the journal Advances in Applied Ceramics comprises selected papers from the conference PIEZO2017: Electroceramics for End Users IX, that took place in Cercedilla (Madrid, Spain) on 19–22 February 2017 at the ‘Lucas Olazabal’ Forestry Residence of the ‘Universidad Politécnica de Madrid (UPM)’. There were 80 participants from academia and industry. They came from France, Spain, Germany, Mexico, Denmark, Slovenia, Norway, Italy, Switzerland, Finland, Uruguay, Czech Republic, Portugal, U.S.A., Latvia, Israel and Belgium. The conference was organised by the European Institute of Piezoelectric Materials and Devices (Piezoinstitute), the ‘Instituto de Ciencia de Materiales de Madrid (ICMM).CSIC’ and the School of Telecommunications Systems and Engineering (ETSIST) of the UPM. The conference was also made possible through the support of the companies Meggitt Sensing Systems (DK) and Aixacct Systems (DE). The sessions covered studies on piezoelectrics, ferroelectrics, relaxors and tuneable materials, applications, new processing techniques, lead-free ceramics and other sustainable materials, modelling and advanced characterisation. The invited talks were given by N. Setter (EPFL, CH) – who spoke in homage to Prof. L. E. Cross, from The Pennsylvania State University (U.S.A.), who passed away on December 2016 – F. Montero de Espinosa (ITEFI-CSIC, ES), M. E. Villafuerte-Castrejón (UNAM, MX) and D. C. Sinclair (Sheffield Univ., UK). The scientific programme consisted of 32 oral and 20 poster presentations. PIEZO2017 provided an opportunity to discuss challenges and future trends in this area. The conference was of high scientific level and technical quality. After a peer-review process according to the rules of Advances in Applied Ceramics journal, 10 invited articles were accepted for publication in this Special Issue. These works give a wide coverage of the topics presented in the conference from materials preparation (‘Ba0.9Ca0.1TiO3: microwave-assisted hydrothermal synthesis and piezoelectric properties’ [1]) to properties (‘Structural and functional characterisation of KNNS-BNKZ lead-free piezoceramics’ [2], ‘Elasto-optic behavior in epitaxial films of perovskite oxide ferroelectrics’ [3], ‘The representation of coupling interactions in the material properties open database (MPOD)’ [4] and ‘Methodology to evaluate variations in piezoelectric constants after aging process’ [5]) and device design and modelling (‘Design of piston-like piezoelectric transducers based on a phononic crystal’ [6], ‘Parametric study of a thin piezoelectric cantilever for energy harvesting applications’ [7], ‘Virtual instrument to obtain electrical models of piezoelectric elements used in energy harvesting’ [8], ‘Modelling of the mechanical response of piezoelectric structures from millimeter to micrometer’ [9] and ‘Effects of the LGT crystal quality on the resonance frequency stability of bulk acoustic waves resonators’ [10]) of piezoelectrics and related m
《应用陶瓷进展》杂志的这一期特刊包括了2017年2月19日至22日在Cercedilla(西班牙马德里)举行的“最终用户电陶瓷IX”会议上的精选论文，该会议在“马德里politcnica大学(UPM)”的“Lucas Olazabal”森林住宅举行。来自学术界和工业界的80名与会者参加了会议。他们分别来自法国、西班牙、德国、墨西哥、丹麦、斯洛文尼亚、挪威、意大利、瑞士、芬兰、乌拉圭、捷克共和国、葡萄牙、美国、拉脱维亚、以色列和比利时。会议由欧洲压电材料与器件研究所(Piezoinstitute)、马德里材料科学研究所(ICMM)组织。CSIC和UPM电信系统与工程学院(ETSIST)。此次会议还得到了梅吉特传感系统公司(DK)和Aixacct系统公司(DE)的支持。会议涵盖了压电、铁电、弛豫和可调谐材料、应用、新加工技术、无铅陶瓷和其他可持续材料、建模和高级特性的研究。特邀演讲人是N. Setter (EPFL, CH)，他向2016年12月去世的美国宾夕法尼亚州立大学L. E. Cross教授、F. Montero de Espinosa (ITEFI-CSIC, ES)、m.e. Villafuerte-Castrejón (UNAM, MX)和D. C. Sinclair (Sheffield University, UK)致敬。科学方案包括32次口头报告和20次海报报告。PIEZO2017为讨论这一领域的挑战和未来趋势提供了机会。会议具有较高的科学水平和技术质量。根据《应用陶瓷进展》杂志的规则，经过同行评审，10篇特邀文章被接受发表在本期特刊上。这些工作广泛涵盖了会议上提出的主题，从材料准备(' Ba0.9Ca0.1TiO3:微波辅助水热合成和压电性能”[1])到“KNNS-BNKZ无铅压电陶瓷的结构和功能表征”[2]，“钙钛矿氧化物铁电体外延膜的弹性光学行为”[3]，“材料特性开放数据库(MPOD)中耦合相互作用的表示”[4]，“老化过程后压电常数变化的评估方法”[5]，以及器件设计和建模(“基于声子晶体的活塞式压电换能器的设计”[6]，“用于能量收集应用的薄压电悬臂梁的参数化研究”[7]，“获取用于能量收集的压电元件电气模型的虚拟仪器”[8]，“从毫米到微米的压电结构的机械响应建模”[9]和“LGT晶体质量对体声波谐振器谐振频率稳定性的影响”[10])的压电和相关材料。我们希望它将提供一个很好的概述，目前在压电材料和器件领域的研究，这将有助于那些参与这个主题以及新手。我们要向为本期特刊做出贡献的作者们表示感谢。我们也感谢审稿人在提供批评性评论方面的辛勤工作。感谢《应用陶瓷进展》编辑Michael Reece、编辑助理SophieDonnelly和RoseWorrell对编辑工作的有效协调。我们希望您喜欢阅读这篇文章，并鼓励您参加将于2019年1月在捷克共和国Krkonoše举行的PIEZO2019系列未来会议。
{"title":"Editorial: special issue on PIEZO2017: Electroceramics for End Users IX","authors":"L. Pardo, A. González, J. Bartolomé, P. Ochoa","doi":"10.1080/17436753.2022.2141994","DOIUrl":"https://doi.org/10.1080/17436753.2022.2141994","url":null,"abstract":"This special issue of the journal Advances in Applied Ceramics comprises selected papers from the conference PIEZO2017: Electroceramics for End Users IX, that took place in Cercedilla (Madrid, Spain) on 19–22 February 2017 at the ‘Lucas Olazabal’ Forestry Residence of the ‘Universidad Politécnica de Madrid (UPM)’. There were 80 participants from academia and industry. They came from France, Spain, Germany, Mexico, Denmark, Slovenia, Norway, Italy, Switzerland, Finland, Uruguay, Czech Republic, Portugal, U.S.A., Latvia, Israel and Belgium. The conference was organised by the European Institute of Piezoelectric Materials and Devices (Piezoinstitute), the ‘Instituto de Ciencia de Materiales de Madrid (ICMM).CSIC’ and the School of Telecommunications Systems and Engineering (ETSIST) of the UPM. The conference was also made possible through the support of the companies Meggitt Sensing Systems (DK) and Aixacct Systems (DE). The sessions covered studies on piezoelectrics, ferroelectrics, relaxors and tuneable materials, applications, new processing techniques, lead-free ceramics and other sustainable materials, modelling and advanced characterisation. The invited talks were given by N. Setter (EPFL, CH) – who spoke in homage to Prof. L. E. Cross, from The Pennsylvania State University (U.S.A.), who passed away on December 2016 – F. Montero de Espinosa (ITEFI-CSIC, ES), M. E. Villafuerte-Castrejón (UNAM, MX) and D. C. Sinclair (Sheffield Univ., UK). The scientific programme consisted of 32 oral and 20 poster presentations. PIEZO2017 provided an opportunity to discuss challenges and future trends in this area. The conference was of high scientific level and technical quality. After a peer-review process according to the rules of Advances in Applied Ceramics journal, 10 invited articles were accepted for publication in this Special Issue. These works give a wide coverage of the topics presented in the conference from materials preparation (‘Ba0.9Ca0.1TiO3: microwave-assisted hydrothermal synthesis and piezoelectric properties’ [1]) to properties (‘Structural and functional characterisation of KNNS-BNKZ lead-free piezoceramics’ [2], ‘Elasto-optic behavior in epitaxial films of perovskite oxide ferroelectrics’ [3], ‘The representation of coupling interactions in the material properties open database (MPOD)’ [4] and ‘Methodology to evaluate variations in piezoelectric constants after aging process’ [5]) and device design and modelling (‘Design of piston-like piezoelectric transducers based on a phononic crystal’ [6], ‘Parametric study of a thin piezoelectric cantilever for energy harvesting applications’ [7], ‘Virtual instrument to obtain electrical models of piezoelectric elements used in energy harvesting’ [8], ‘Modelling of the mechanical response of piezoelectric structures from millimeter to micrometer’ [9] and ‘Effects of the LGT crystal quality on the resonance frequency stability of bulk acoustic waves resonators’ [10]) of piezoelectrics and related m","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83707388","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 : 2022-11-07DOI: 10.1080/17436753.2022.2139047
A. Kocjan
{"title":"Introduction to research on advanced ceramics in dentistry (4th Advanced Ceramics and Technologies for Dentistry (ACT4D) 2020)","authors":"A. Kocjan","doi":"10.1080/17436753.2022.2139047","DOIUrl":"https://doi.org/10.1080/17436753.2022.2139047","url":null,"abstract":"","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81978418","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 : 2022-11-03DOI: 10.1080/17436753.2022.2139448
Yasith Chameendra Jayakody Mudiyanselage, K. Ramachandran, Doni Daniel Jayaseelan
ABSTRACT ZrSi2 was fabricated via reactive hot-pressing technique for 45 min at 1250°C and 1350°C, respectively. The hot-pressed sample exhibited Vickers hardness of 10.93 ± 0.32 GPa and indentation fracture toughness of 3.16 ± 0.54 MPa.m1/2. Thermal conductivity (RT-2.99 W (m.K)−1) and diffusivity (RT–18.2 mm2 s−1) of the sample decreased with increasing temperature due to phonon scattering. Oxidation studies were carried out for the hot-pressed samples from 1000°C to 1200°C for 5, 48 and 100 h in air. The oxidation test results showed that ZrSi2 followed selective oxidation with Si diffusing into the oxide layers at high temperatures. At 1200°C, the surface of ZrSi2 oxidised completely to form a high-temperature stable phase, zircon (ZrSiO4). The autoclave test at 250°C and 250 bar shown negligible mass gain (∼0.022 g) which suggests the usage of ZrSi2 for nuclear fuel cladding applications.
采用反应热压法制备ZrSi2，温度分别为1250℃和1350℃，反应时间为45min。热压试样的维氏硬度为10.93±0.32 GPa，压痕断裂韧性为3.16±0.54 MPa.m1/2。由于声子散射，样品的导热系数(RT-2.99 W (m.K)−1)和扩散系数(RT-18.2 mm2 s−1)随温度升高而降低。对热压样品在空气中从1000°C到1200°C进行5、48和100小时的氧化研究。氧化实验结果表明，ZrSi2在高温下发生选择性氧化，Si扩散到氧化层中。在1200℃时，ZrSi2表面完全氧化形成高温稳定相锆石(ZrSiO4)。在250°C和250 bar下的高压灭菌器试验显示，质量增益可以忽略不计(~ 0.022 g)，这表明ZrSi2用于核燃料包壳应用。
{"title":"Fabrication and characterisation of ZrSi2 ceramics via reactive hot-pressing","authors":"Yasith Chameendra Jayakody Mudiyanselage, K. Ramachandran, Doni Daniel Jayaseelan","doi":"10.1080/17436753.2022.2139448","DOIUrl":"https://doi.org/10.1080/17436753.2022.2139448","url":null,"abstract":"ABSTRACT ZrSi2 was fabricated via reactive hot-pressing technique for 45 min at 1250°C and 1350°C, respectively. The hot-pressed sample exhibited Vickers hardness of 10.93 ± 0.32 GPa and indentation fracture toughness of 3.16 ± 0.54 MPa.m1/2. Thermal conductivity (RT-2.99 W (m.K)−1) and diffusivity (RT–18.2 mm2 s−1) of the sample decreased with increasing temperature due to phonon scattering. Oxidation studies were carried out for the hot-pressed samples from 1000°C to 1200°C for 5, 48 and 100 h in air. The oxidation test results showed that ZrSi2 followed selective oxidation with Si diffusing into the oxide layers at high temperatures. At 1200°C, the surface of ZrSi2 oxidised completely to form a high-temperature stable phase, zircon (ZrSiO4). The autoclave test at 250°C and 250 bar shown negligible mass gain (∼0.022 g) which suggests the usage of ZrSi2 for nuclear fuel cladding applications.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86942652","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 : 2022-07-01DOI: 10.1080/17436753.2022.2155369
Pengyu Ji, Chenghao Song, Yongwan Wu, Hailiang Deng, X. Deng, Yi Zhang, Xiang-jin Ding, Haijun Zhang, S. Ran
ABSTRACT ZrO2-reinforced porous mullite ceramics were fabricated by a foam-gel casting approach using zircon (ZrSiO4) powders and alumina (Al2O3) powders as raw materials. The influence of firing temperature on the phase composition of porous samples was analysed. Based on the analysis results, the effects of a blowing agent on the physical properties, microstructure, mechanical strength and heat conductivity of ZrO2-reinforced porous mullite samples fired at 1600°C were investigated. In the present study, linear shrinkage, porosity and mean pore size of ZrO2-reinforced porous mullite ceramics increased, and volume density, mechanical strength and heat conductivity decreased. When the dosage of the blowing agent was 1.0 vol.-%, the flexural strength and compressive strength of ZrO2-reinforced porous mullite sample with 77.4% porosity respectively reached 3.0 and 10.9 MPa, and their heat conductivity was kept at 0.181 W m−1 K−1.
摘要:以锆英石(ZrSiO4)粉末和氧化铝(Al2O3)粉末为原料，采用泡沫-凝胶铸造法制备了zro2增强多孔莫来石陶瓷。分析了烧结温度对多孔试样相组成的影响。在此基础上，研究了发泡剂对1600℃焙烧zro2增强多孔莫来石的物理性能、微观结构、机械强度和导热性能的影响。在本研究中，zro2增强多孔莫来石陶瓷的线收缩率、孔隙率和平均孔径增大，体积密度、机械强度和导热系数减小。当发泡剂用量为1.0 vol.-%时，孔隙率为77.4%的zro2增强多孔莫来石试样的抗折强度和抗压强度分别达到3.0和10.9 MPa，导热系数保持在0.181 W m−1 K−1。
{"title":"Fabrication and characterisation of ZrO2-reinforced porous mullite ceramics","authors":"Pengyu Ji, Chenghao Song, Yongwan Wu, Hailiang Deng, X. Deng, Yi Zhang, Xiang-jin Ding, Haijun Zhang, S. Ran","doi":"10.1080/17436753.2022.2155369","DOIUrl":"https://doi.org/10.1080/17436753.2022.2155369","url":null,"abstract":"ABSTRACT ZrO2-reinforced porous mullite ceramics were fabricated by a foam-gel casting approach using zircon (ZrSiO4) powders and alumina (Al2O3) powders as raw materials. The influence of firing temperature on the phase composition of porous samples was analysed. Based on the analysis results, the effects of a blowing agent on the physical properties, microstructure, mechanical strength and heat conductivity of ZrO2-reinforced porous mullite samples fired at 1600°C were investigated. In the present study, linear shrinkage, porosity and mean pore size of ZrO2-reinforced porous mullite ceramics increased, and volume density, mechanical strength and heat conductivity decreased. When the dosage of the blowing agent was 1.0 vol.-%, the flexural strength and compressive strength of ZrO2-reinforced porous mullite sample with 77.4% porosity respectively reached 3.0 and 10.9 MPa, and their heat conductivity was kept at 0.181 W m−1 K−1.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81606413","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 : 2022-05-19DOI: 10.1080/17436753.2022.2119545
Shuoyan Zhai, Xianying Cao, Juncheng Liu, Qiang Liu
ABSTRACT Al2O3/MgAl2O4 directionally solidified eutectic ceramic (DSEC) rods with Φ 10 mm were prepared with induction heating zone melting (IHZM) method. The phase components of the DSEC were composed of MgAl2O4 phase growing along the preferred orientation 〈311〉 and Al2O3 phases growing along the preferred orientation 〈110〉. In the DSEC, the Al2O3 phase is the matrix phase mixed with part of MgAl2O4 phase and the other part of MgAl2O4 phase forms slice structure. Both the DSEC density and hardness decrease with the increase of the growth rate, due to the increase of micropores in DSEC with the higher growth rate. However, its fracture toughness improved due to the fine interface spacing toughening and the dispersion toughening. The highest hardness and fracture toughness of DSEC are 19.3 GPa and 3.74 MPa·m1/2, respectively, the toughening effect could be attributed to the crack deflection and bifurcation hindering the propagation of crack in DSEC.
{"title":"Microstructure characteristics and mechanical properties of Al2O3/MgAl2O4 directionally solidified eutectic ceramic","authors":"Shuoyan Zhai, Xianying Cao, Juncheng Liu, Qiang Liu","doi":"10.1080/17436753.2022.2119545","DOIUrl":"https://doi.org/10.1080/17436753.2022.2119545","url":null,"abstract":"ABSTRACT Al2O3/MgAl2O4 directionally solidified eutectic ceramic (DSEC) rods with Φ 10 mm were prepared with induction heating zone melting (IHZM) method. The phase components of the DSEC were composed of MgAl2O4 phase growing along the preferred orientation 〈311〉 and Al2O3 phases growing along the preferred orientation 〈110〉. In the DSEC, the Al2O3 phase is the matrix phase mixed with part of MgAl2O4 phase and the other part of MgAl2O4 phase forms slice structure. Both the DSEC density and hardness decrease with the increase of the growth rate, due to the increase of micropores in DSEC with the higher growth rate. However, its fracture toughness improved due to the fine interface spacing toughening and the dispersion toughening. The highest hardness and fracture toughness of DSEC are 19.3 GPa and 3.74 MPa·m1/2, respectively, the toughening effect could be attributed to the crack deflection and bifurcation hindering the propagation of crack in DSEC.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81977667","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 : 2022-05-19DOI: 10.1080/17436753.2022.2109259
Benjun Cheng, Can Yao, Juntong Huang, Cheng Liu, Shaowei Zhang, He-song Li
ABSTRACT A homogeneous and high-purity titanium silicon carbon powder (Ti3SiC2) is synthesised, using titanium, silicon and carbon black powders as raw starting materials at low temperatures via an improved molten salt method. This work demonstrates that multiple molten salts are more beneficial in facilitating the synthesis of Ti3SiC2 powder. The effect of reaction temperature on the purity of the synthesis was investigated, and the amount of excess Si required to compensate for their evaporating losses was determined. The powders were characterised by Various instruments. SEM and TEM images show that the as-prepared Ti3SiC2 retained its homogeneous morphology, and is near-pure, 500-600 nm in size, and generally well-dispersed. We believe that TiC and TiSi2 formed by the molten salt method at low temperatures is the dominant factor in the reduced synthesis temperature and good dispersion of the final Ti3SiC2 powder.
{"title":"Low-temperature synthesis of Ti3SiC2 powders in mixed molten salts","authors":"Benjun Cheng, Can Yao, Juntong Huang, Cheng Liu, Shaowei Zhang, He-song Li","doi":"10.1080/17436753.2022.2109259","DOIUrl":"https://doi.org/10.1080/17436753.2022.2109259","url":null,"abstract":"ABSTRACT A homogeneous and high-purity titanium silicon carbon powder (Ti3SiC2) is synthesised, using titanium, silicon and carbon black powders as raw starting materials at low temperatures via an improved molten salt method. This work demonstrates that multiple molten salts are more beneficial in facilitating the synthesis of Ti3SiC2 powder. The effect of reaction temperature on the purity of the synthesis was investigated, and the amount of excess Si required to compensate for their evaporating losses was determined. The powders were characterised by Various instruments. SEM and TEM images show that the as-prepared Ti3SiC2 retained its homogeneous morphology, and is near-pure, 500-600 nm in size, and generally well-dispersed. We believe that TiC and TiSi2 formed by the molten salt method at low temperatures is the dominant factor in the reduced synthesis temperature and good dispersion of the final Ti3SiC2 powder.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91162356","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 : 2022-05-19DOI: 10.1080/17436753.2022.2121460
M. Krinitcyn
ABSTRACT In this article, the thermal stability of TiC–Ti3AlC2 and TiC–Ti3AlC composites during selective laser sintering/melting is studied. The phase composition evolution after laser processing is investigated and the structure of the obtained samples is also described. Samples were obtained by selective laser sintering/melting from mixtures of commercial powders and from a synthesised composite powder. It is possible to maintain most of the MAX-phase using the laser processing parameters described; in addition, the intermetallic phase is formed.
{"title":"Thermal stability of TiC–Ti3AlC2 and TiC–Ti3AlC composites during selective laser treatment","authors":"M. Krinitcyn","doi":"10.1080/17436753.2022.2121460","DOIUrl":"https://doi.org/10.1080/17436753.2022.2121460","url":null,"abstract":"ABSTRACT In this article, the thermal stability of TiC–Ti3AlC2 and TiC–Ti3AlC composites during selective laser sintering/melting is studied. The phase composition evolution after laser processing is investigated and the structure of the obtained samples is also described. Samples were obtained by selective laser sintering/melting from mixtures of commercial powders and from a synthesised composite powder. It is possible to maintain most of the MAX-phase using the laser processing parameters described; in addition, the intermetallic phase is formed.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88623770","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 : 2022-05-19DOI: 10.1080/17436753.2022.2121536
Shafique Ahmed, Chunxia Song, Jiyue Wu, B. Li, Haixue Yan
ABSTRACT The temperature dependence of ageing in the commercial zirconia ceramic is crucial in the applications of dental implants. This study investigated the relationship between structure and mechanical properties of the zirconia dental ceramics and their susceptibility to human body temperature in a prolonged time. Commercial samples were put into exaggerated low-temperature degradation (LTD) as per ISO standard and three-quarters of its ageing temperature to see its effect on LTD in zirconia-based ceramics. The results reveal a negligible effect of LTD on the material at a temperature lower than 134°C, which is the standard LTD temperature for zirconia.
{"title":"Temperature dependence in ageing process in commercial zirconia dental ceramics","authors":"Shafique Ahmed, Chunxia Song, Jiyue Wu, B. Li, Haixue Yan","doi":"10.1080/17436753.2022.2121536","DOIUrl":"https://doi.org/10.1080/17436753.2022.2121536","url":null,"abstract":"ABSTRACT The temperature dependence of ageing in the commercial zirconia ceramic is crucial in the applications of dental implants. This study investigated the relationship between structure and mechanical properties of the zirconia dental ceramics and their susceptibility to human body temperature in a prolonged time. Commercial samples were put into exaggerated low-temperature degradation (LTD) as per ISO standard and three-quarters of its ageing temperature to see its effect on LTD in zirconia-based ceramics. The results reveal a negligible effect of LTD on the material at a temperature lower than 134°C, which is the standard LTD temperature for zirconia.","PeriodicalId":7224,"journal":{"name":"Advances in Applied Ceramics","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87093416","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}
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