| Mechanism of toughening and strengthening of Si3N4／SiC／ZrO2 nanocomposites |
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| 引用本文： | 晏建武,周继承,鲁世强,李卫超,张志华.Mechanism of toughening and strengthening of Si3N4／SiC／ZrO2 nanocomposites[J].中国有色金属学会会刊,2004,14(3):430-435. |
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| 作者姓名： | 晏建武 周继承 鲁世强 李卫超 张志华 |
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| 作者单位： | School of Physics Science and Technology，School of Physics Science and Technology，Department of Materials Science and Engineering，Department of Materials Science and Engineering，Department of Materials Science and Engineering Central South University，Changsha 410083，China，Department of Materials Science and Engineering，Nanchang Institute of Aeronautical Technology，Nanchang 330034，China，Central South University，Changsha 410083，China，Nanchang Institute of Aeronautical Technology，Nanchang 330034，China，Nanchang Institute of Aeronautical Technology，Nanchang 330034，China，Nanchang Institute of Aeronautical Technology，Nanchang 330034，China |
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| 基金项目： | 国家自然科学基金，Nanchang Institute of Aeronautical Technology |
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| 摘 要： | 1 INTRODUCTIONInnumerousceramicmaterials ,Si3N4 ceramiciscalled“omnipotentchampion”.Itisnotonlyagoodconstructionmaterialappliedinhightemperature ,butalsoanewfunctionmaterial1,2 ] .Withthedevel opmentofnanocomposites ,theapplicationinvestiga tionofnewtypeSi3N4 ceramicconstructionmaterialshasenteredanewage .Ithasvastappliedperspec tive39] .ButthelowtoughnessistheobstacleoftheapplicationofSi3N4 ceramicmaterials ,sohowtoim provethetoughnessofSi3N4 ceramicmaterialsisanurgentproblem .T…
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| 关 键 词： | 韧化机制 Si3N4／SiC／ZrO2 复合材料 纳米材料 强化机制 |
Mechanism of toughening and strengthening of Si3N4/SiC/ZrO2 nanocomposites |
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| YAN Jian-wu.Mechanism of toughening and strengthening of Si3N4/SiC/ZrO2 nanocomposites[J].Transactions of Nonferrous Metals Society of China,2004,14(3):430-435. |
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| Authors: | YAN Jian-wu |
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| Affiliation: | YAN Jian-wu~ |
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| Abstract: | The Si3N4-based nanocomposites reinforced with micro ZrO2 and nano SiC particles were prepared by polarity dispersant and vacuum-sintering technology. The mechanical properties and microstructures were tested. The results show that appropriate amount of micro ZrO2 and nano SiC particles, not only enhance the microhardness, but also block the excessively growth of β-Si3 N4 and β-Si3N4 grains, so they finally all grow up to uniformly pole-shaped grains. This process is similar to the strengthening and toughening mechanism of grain whiskers and makes a remarkable improvement on the toughness. Compared with Si3N4 ceramic, the toughness of Si3N4/SiC/ZrO2 nanocomposites are increased from 6.2 MPa · m1/2 to 11 MPa · m1/2. |
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| Keywords: | Si3N4 nanocomposites toughening strengthening |
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