| 维氏压痕对常压固相烧结碳化硅陶瓷材料力学性能的影响 |
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| 引用本文： | 杨晓,刘学建,黄政仁,刘桂玲,姚秀敏.维氏压痕对常压固相烧结碳化硅陶瓷材料力学性能的影响[J].无机材料学报,2012,27(9):965-969. |
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| 作者姓名： | 杨晓 刘学建 黄政仁 刘桂玲 姚秀敏 |
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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 研究生院, 北京100049) |
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| 基金项目： | 中国科学院知识创新重要方向性项目;上海硅酸盐研究所创新项目~~ |
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| 摘 要： | 为了研究维氏压痕裂纹对常压固相烧结碳化硅陶瓷(SSiC)材料力学性能的影响, 通过扫描电镜观察了0.1~100 N的压痕载荷下产生的表面裂纹及裂纹剖面的状况, 并测试了相应载荷下的力学性质, 探讨了压痕法测量SSiC材料硬度、韧性等力学性质的适当压力载荷. 结果表明, SSiC材料压痕裂纹起始的临界压力载荷介于0.1~0.2 N; 当压痕载荷小于0.5 N时, 裂纹尺寸小于5 μm, SSiC材料的平均弯曲强度受影响程度较小. 此外, 当压痕载荷为10 N以上时, 压痕法测得的维氏硬度值趋近定值, 且所得到的裂纹是半圆形裂纹, 因此, 10 N为采用压痕法准确测量SSiC材料硬度及韧性的最低压痕载荷值.
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| 关 键 词： | 碳化硅陶瓷 压痕载荷 力学性质 |
| 收稿时间： | 2011-10-17 |
| 修稿时间： | 2011-11-21 |
Effects of Vickers Cracks on the Mechanical Properties of Solid-phase-sintered Silicon Carbide Ceramics |
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| YANG Xiao,LIU Xue-Jian,HUANG Zheng-Ren,LIU Gui-Ling,YAO Xiu-Min.Effects of Vickers Cracks on the Mechanical Properties of Solid-phase-sintered Silicon Carbide Ceramics[J].Journal of Inorganic Materials,2012,27(9):965-969. |
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| Authors: | YANG Xiao LIU Xue-Jian HUANG Zheng-Ren LIU Gui-Ling YAO Xiu-Min |
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| Affiliation: | (1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China) |
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| Abstract: | In order to study the effects of Vickers cracks on the mechanical properties of solid-phase-sintered silicon carbide(SSiC for short) ceramics,the indentation cracks and the crack profiles were observed after loading 0.1–100 N loads on the SSiC samples by SEM.The critical indentation load for Vickers crack initiation in SSiC ceramics lies between 0.1 N and 0.2 N.Indentations by loads lower than 0.5 N have limited influence on bending strength.And if the indentation loads is higher than 10 N,the obtained hardness floats around 24.2 GPa and the cracks are half-coin type.The proper Vickers indentation load range for SSiC ceramic hardness and toughness tests are determined to be 10 N or above. |
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| Keywords: | silicon carbide ceramic indentation load mechanical properties |
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