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粉末冶金材料科学与工程  2021, Vol. 26 Issue (1): 77-83    
  工艺技术 本期目录 | 过刊浏览 | 高级检索 |
B4C含量对ZrB2陶瓷微观结构及力学性能的影响
杜玉辉, 汤振霄, 彭可, 周远明, 易茂中
中南大学 粉末冶金国家重点实验室,长沙 410083
Effects of B4C content on the microstructure and mechanical properties of ZrB2 ceramics
DU Yuhui, TANG Zhenxiao, PENG Ke, ZHOU Yuanming, YI Maozhong
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
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摘要 针对ZrB2陶瓷粉末在球磨时易掺入ZrO2,影响ZrB2陶瓷烧结致密化的问题,添加B4C作为烧结助剂,采用无压烧结法制备ZrB2陶瓷材料,研究B4C含量(w(B4C),下同)对材料微观形貌、硬度与抗弯强度的影响。结果表明,B4C通过与晶粒表面的ZrO2发生反应,抑制ZrB2晶粒粗化,减小晶粒尺寸,从而提高烧结致密度。随B4C含量增加,ZrB2陶瓷的晶粒尺寸和相对密度逐渐增大,抗弯强度和硬度先升高后降低。当w(B4C)为7%时,ZrB2晶粒细小,材料的抗弯强度和硬度(HV)达到最大,分别为242 MPa和12.65 GPa。w(B4C)增加至9%时,出现晶粒异常长大,材料力学性能下降。
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作者相关文章
杜玉辉
汤振霄
彭可
周远明
易茂中
关键词 ZrB2陶瓷B4C含量无压烧结微观结构抗弯强度    
Abstract:Aiming at the problem that ZrB2 ceramics powder were easily mixed with ZrO2 during ball milling, which affected the sintering denstification of ZrB2 ceramics, B4C was introduced as sintering additive, and ZrB2 ceramics were prepared by pressureless sintering. The effects of B4C content on the microstructure and mechanical properties of the materials were investigated. The results show that B4C can inhibit grain coarsening and reduce grain size by reacting with ZrO2 on the grain surface. With the increase of B4C content, the grain size and relative density of the ZrB2 ceramics increase gradually, while the flexural strength and hardness first increase and then decrease. When the mass fraction of B4C is 7%, the grain size of ZrB2 are fine, and the flexural strength and hardness of the material reach the maximum value, which are 242 MPa and 12.65 GPa respectively. As increasing the content of B4C to 9%, the grains grow abnormally and the mechanical properties decrease.
Key wordsZrB2 ceramics    B4C content    pressureless sintering    microstructure    flexural strength
收稿日期: 2020-11-26      出版日期: 2021-03-22
ZTFLH:  U465.3  
基金资助:装备预研相关基础研究项目(4142202XXXX); 湖南省自然科学基金资助项目(2017JJ2320)
通讯作者: 彭可,副教授,博士。电话:0731-88879422;E-mail: pengkecsu@csu.edu.cn   
引用本文:   
杜玉辉, 汤振霄, 彭可, 周远明, 易茂中. B4C含量对ZrB2陶瓷微观结构及力学性能的影响[J]. 粉末冶金材料科学与工程, 2021, 26(1): 77-83.
DU Yuhui, TANG Zhenxiao, PENG Ke, ZHOU Yuanming, YI Maozhong. Effects of B4C content on the microstructure and mechanical properties of ZrB2 ceramics. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 77-83.
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