| Al_2O_3／nano－SiC复相陶瓷力学性能及显微结构 |
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| 引用本文： | 余龙文,曾照强,苗赫濯,江作昭. Al_2O_3／nano－SiC复相陶瓷力学性能及显微结构[J]. 清华大学学报(自然科学版), 1996, 0(8) |
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| 作者姓名： | 余龙文 曾照强 苗赫濯 江作昭 |
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| 作者单位： | 清华大学材料科学与工程系 |
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| 摘 要： | 研究了热压烧结Ａｌ２Ｏ３／ｎａｎｏ－ＳｉＣ复相陶瓷的力学性能及显微结构。研究表明,纳米ＳｉＣ的引入显著地改善了材料的力学性能,在ＳｉＣ添加体积分数为１０％时,Ａｌ２Ｏ３／ｎａｎｏ－ＳｉＣ复相陶瓷抗弯强度σｆ达峰值为８６９ＭＰａ,断裂韧性ＫＩｃ也达峰值为６．７ＭＰａ·ｍ０．５,比纯Ａｌ２Ｏ３基体材料分别提高１３８％和８１％。ＴＥＭ观察表明：纳米ＳｉＣ晶粒主要存在于Ａｌ２Ｏ３基体晶粒内部,形成独特的“晶内型”结构。当受外力作用时,既能因弥散的纳米颗粒诱发穿晶断裂,且穿晶断裂时,还能因晶内存在第二相颗粒而引起裂纹偏转,起到增强增韧作用。
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| 关 键 词： | 纳米SiC 复相陶瓷 力学性能 显微结构 |
Study on the mechnical properties and microstructure of Al_2O_3/nano-SiC multiphase ceramics |
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| Yu Longwen, Zeng Zhaoqiang, Miao Hezhuo, Jiang Zuozhao. Study on the mechnical properties and microstructure of Al_2O_3/nano-SiC multiphase ceramics[J]. Journal of Tsinghua University(Science and Technology), 1996, 0(8) |
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| Authors: | Yu Longwen Zeng Zhaoqiang Miao Hezhuo Jiang Zuozhao |
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| Abstract: | The mechanical properties and microstructure of Al2O3/nano-SiC multiphase ceramics made by hot-pressing were studied. The results showed that the mechanical properties of the composites were dramatically improved by incorporating of nano-size SiC particles. When the nano-SiC content was 10% the maximum fiexural strength and fracture toughness were 869 MPa and 6. 7 MPa .mo.5, which were 138% and 81% higher than that of Al2O3 matrix respectively. TEM showed that the nano-size SiC particles sited inside the grains of Al2O3 matrix mainly, and formed the "intergranular-type" microstructure. The localized tensile stress around the nano-size particles induces the transgranular fracture during loading, then the strengthening and toughening were occurred by the crack deflection by the hard particles. |
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| Keywords: | nano-SiC multiphase ceramics mechanical properties microstructure |
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