碳含量对无压烧结碳化硅陶瓷的显微组织和力学性能的影响

材料导报

2021, Vol. 35

Issue (Z1): 169-171

无机非金属及其复合材料

碳含量对无压烧结碳化硅陶瓷的显微组织和力学性能的影响

刘宝友^1,2, 岳新艳^1,2, 冯东^1,2, 茹红强^1,2, 刘春明^1,2

1 东北大学材料各向异性与织构教育部重点实验室,沈阳 110819
2 东北大学材料科学与工程学院陶瓷与粉末冶金研究所,沈阳 110819

Effect of Carbon Content on Microstructure and Properties of Pressureless-sintered Silicon Carbide

LIU Baoyou^1,2, YUE Xinyan^1,2, FENG Dong^1,2, RU Hongqiang^1,2, LIU Chunming^1,2

1 Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education, Northeastern University, Shenyang 110819, China
2 Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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摘要在碳化硼添加量为1wt%的条件下,考察不同碳含量对2 000 ℃下制备的无压固相烧结碳化硅陶瓷的显微组织和力学性能的影响。实验结果表明:物相分析显示不同C含量的SiC陶瓷样品的XRD衍射图谱近似相同,其中主相均为SiC,检测到少量C,未检测到B₄C相。当C含量为3wt%时,SiC陶瓷样品的力学性能达到最佳,其相对密度、抗折强度、断裂韧性与维氏硬度分别为98.6%、452 MPa、4.5 MPa·m^1/2和 30 GPa。继续增加碳含量,SiC晶粒存在局部异常长大现象,相应样品的力学性能也有所下降。

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关键词: 碳含量无压烧结碳化硅显微组织力学性能

Abstract: In the present study, using samples with 1wt% B₄C addition prepared by pressureless sintering at 2 000 ℃, the effect of carbon content on the microstructure and mechanical properties of solid-state sintered silicon carbide ceramics was investigated. The experimental results were as follows: XRD patterns of all samples with different carbon content were almost same with each other. SiC as main phase and a trace amount of C were identified, B₄C phase was not detected. When carbon content was 3wt%, the sample showed the optimum mechanical properties of which the volume density, relative density, bending strength, fracture toughness and Vickers hardness were 98.6%, 452 MPa, 4.5 MPa·m^1/2, 30 GPa, respectively. With increasing carbon content, the grain size of silicon carbide gradually increased and some abnormal grain growth occurred which could decrease the mechanical properties of this material.

Key words: carbon content pressureless-sintered SiC microstructure mechanical property

发布日期: 2021-07-16

ZTFLH:

TB333

基金资助: 国家重点研发项目(2017YFB0310300)

通讯作者: ruhq@smm.neu.edu.cn

作者简介: 刘宝友,东北大学硕士,主要研究碳化硅超细粉体的提纯及碳化硅的无压烧结。茹红强,东北大学教授,博士研究生导师。主要研究方向为先进陶瓷材料、新型摩擦材料、陶瓷/金属复合材料、防弹新材料、粉末冶金新材料。近年来主持和完成包括国家“863”高技术项目和国家自然科学基金项目在内的各类科研项目30余项。在长期的科研工作中先后完成了 “高技术碳化硅陶瓷的无压烧结技术”、“高技术碳化硼陶瓷的无压烧结技术”、“高性能三维网络SiC陶瓷材料的制备技术”、“二硼化钛无压烧结技术”和“陶瓷/铝合金复合材料制备技术”等成果。发表论文230余篇,主编出版专著二部。获得省部级科研奖励6次。申请国家发明专利20项,获批15项。

引用本文:

刘宝友, 岳新艳, 冯东, 茹红强, 刘春明. 碳含量对无压烧结碳化硅陶瓷的显微组织和力学性能的影响[J]. 材料导报, 2021, 35(Z1): 169-171.
LIU Baoyou, YUE Xinyan, FENG Dong, RU Hongqiang, LIU Chunming. Effect of Carbon Content on Microstructure and Properties of Pressureless-sintered Silicon Carbide. Materials Reports, 2021, 35(Z1): 169-171.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2021/V35/IZ1/169

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