| 反应烧结制备Si3N4/SiC复相陶瓷及其力学性能研究 |
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| 引用本文： | 胡海龙,姚冬旭,夏咏锋,左开慧,曾宇平. 反应烧结制备Si3N4/SiC复相陶瓷及其力学性能研究[J]. 无机材料学报, 2014, 29(6): 594-598. DOI: 10.3724/SP.J.1077.2014.13469 |
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| 作者姓名： | 胡海龙 姚冬旭 夏咏锋 左开慧 曾宇平 |
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| 作者单位： | (1. 中国科学院 上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海 200050; 2. 中国科学院大学, 北京100049) |
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| 摘 要： | 以两种不同配比Y2O3/Al2O3 (A, 2:3; B, 3:1, 总量15 wt%)为烧结助剂, 通过添加不同质量分数的SiC粉体,反应烧结制备了高强度的氮化硅/碳化硅复相陶瓷。并对材料的相组成、相对密度、显微结构和力学性能进行了分析。结果表明: 在1700℃保温2 h情况下, 烧结助剂A 与B对应的样品中α-Si3N4相全部转化为β-Si3N4; 添加5wt% SiC, 烧结助剂A对应样品的相对密度达到最大值94.8%, 且抗弯强度为521.8 MPa, 相对于不添加SiC样品的抗弯强度(338.7 MPa)提高了约54.1%。SiC能有效改善氮化硅基陶瓷力学性能, 且Si3N4/SiC复相陶瓷断裂以沿晶断裂方式为主。
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| 关 键 词： | 反应烧结 Si3N4/SiC复相陶瓷 烧结助剂 SiC含量 |
| 收稿时间： | 2013-09-17 |
| 修稿时间： | 2013-11-11 |
Mechanical Properties of Reaction-bonded Si3N4/SiC Composite Ceramics |
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| HU Hai-Long,YAO Dong-Xu,XIA Yong-Feng,ZUO Kai-Hui,ZENG Yu-Ping. Mechanical Properties of Reaction-bonded Si3N4/SiC Composite Ceramics[J]. Journal of Inorganic Materials, 2014, 29(6): 594-598. DOI: 10.3724/SP.J.1077.2014.13469 |
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| Authors: | HU Hai-Long YAO Dong-Xu XIA Yong-Feng ZUO Kai-Hui ZENG Yu-Ping |
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| Affiliation: | (1. State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China) |
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| Abstract: | With Y2O3:Al2O3 (A 2:3; B 3:1 total amount 15wt%) as sintering additives and SiC as the second phase, high flexural strength Si3N4/SiC composite ceramics were prepared via nitridation of Si powder. The phase composition, relative density, microstructure as well as mechanical properties were investigated. The experimental results showed that the α→β-Si3N4 phase transformation could be completed at 1700℃ for 2 h with sintering additives A or B. With the sintering additive A and 5wt% SiC addition, the maximum relative density of 94.8% and maximum flexural strength of 521.8 MPa were obtained for the Si3N4/SiC composite ceramics. As compared with the specimen without SiC addition which flexural strength was 338.7 MPa, flexural strength of the above mentioned Si3N4/SiC composite ceramics was improved by 54.1%. SiC powder can effectively improve the mechanical properties of the specimen and the fracture of Si3N4/SiC composite ceramics followed the typical intergranular fractural mode. |
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| Keywords: | reaction-bonded Si3N4/SiC composite ceramics sintering additives SiC content |
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