| 无压烧结氮化硅陶瓷的力学性能和显微结构 |
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| 引用本文： | 刘学建,黄智勇,黄莉萍,张培志,陈晓阳.无压烧结氮化硅陶瓷的力学性能和显微结构[J].无机材料学报,2004,19(6):1282-1286. |
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| 作者姓名： | 刘学建 黄智勇 黄莉萍 张培志 陈晓阳 |
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| 作者单位： | 1. 中国科学院上海硅酸盐研究所, 上海 200050; 2. 上海材料研究所, 上海 200437; 3. 上海大学 上海 200072 |
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| 基金项目： | 上海市基础研究项目(0152nm031,04DZ14002)，国家973基础研究项目(G2000067204-2) |
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| 摘 要： | 以MgO-Al2O3-SiO2为烧结助剂,借助XRD、SEM、TEM、EDS、HRTEM等手段,研究了无压烧结氮化硅陶瓷材料的力学性能和显微结构,着重探讨了材料制备工艺、力学性能和显微结构之间的关系,通过调整制备工艺改善材料微观结构以提高材料的力学性能.强化球磨混合的试样经1780℃无压烧结3h后,抗折强度高达1.06GPa,洛氏硬度92,显微硬度14.2GPa,断裂韧性6.6MPa·m0.5.材料由长柱状β-Si3N4晶粒组成,晶粒具有较大的长径比,长柱晶的近圆晶粒尺寸0.3-0.8μm,长度3-6μm,长径比约7-10,显微结构均匀.
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| 关 键 词： | 氮化硅 无压烧结 力学性能 显微结构 |
| 文章编号： | 1000-324X(2004)06-1282-05 |
| 收稿时间： | 2003-9-28 |
| 修稿时间： | 2003-11-28 |
Mechanical Properties and Microstructure of Silicon Nitride Ceramics by Pressureless Sintering |
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| LIU Xue-Jian,HUANG Zhi-Yong,HUANG Li-Ping,ZHANG Pei-Zhi,CHEN Xiao-Yang.Mechanical Properties and Microstructure of Silicon Nitride Ceramics by Pressureless Sintering[J].Journal of Inorganic Materials,2004,19(6):1282-1286. |
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| Authors: | LIU Xue-Jian HUANG Zhi-Yong HUANG Li-Ping ZHANG Pei-Zhi CHEN Xiao-Yang |
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| Affiliation: | 1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China; 2. Shanghai Institute of Materials; Shanghai 200437, China; 3. Shanghai University; Shanghai 200072; China |
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| Abstract: | The mechanical properties and microstructure of silicon nitride ceramics with MgO-Al2O3-SiO2 as additives produced by pressless sintering were investigated by XRD, SEM, TEM, EDS, and HRTEM. The relationship among preparation processing, microstructure, and mechanical properties was emphatically discussed. Intensifying blend by planetary blender, silicon nitride ceramics sintered at 1780℃ for 3h has an uniform microstructure with bigger aspect ratio of elongated grains (diameter in 0.3～0.8μm, length in 3～6μm, aspect ratio in 7～10), flexure strength of 1.06GPa, HRA hardness of 92, Hv hardness of 14.2GPa, and fracture toughness of 6.6 MPa·m0.5. |
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| Keywords: | silicon nitride pressless sintering mechanical properties microstructure |
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