| Fabrication and mechanical properties of WC-Co-Al2O3 nanocomposites by spark plasma sintering |
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| 作者姓名： | 沈军 张法明 孙剑飞 |
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| 作者单位： | SchoolofMaterialsScienceandEngineering,HarbinInstituteofTechnology,Harbin150001,China |
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| 基金项目： | 国家自然科学基金，Nano Science and Technology Fund of Heilongjiang Province |
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| 摘 要： | Small amounts of nanocrystalline Al2O3 particles were doped in WC-Co nanocrystalline powders to study their reinforcing effects, and spark plasma sintering technique was used to fabricate the WC-Co-Al2O3 nanocomposites. Experimental results show that the use of Al2O3 nanoparticles as dispersions to reinforce WC-Co composites can increase the hardness, especially the transverse rupture strength of the WC-Co hardmetal. With addition of 0.5%(mass fraction) Al2O3 nanoparticles, the spark plasma sintered WC-TCo-0. 5Al2O3 nanocomposites exhibit hardness of 21.22 GPa and transverse rupture strength of 3 548 MPa. The fracture surface of the WC-TCo-0.5Al2O3 nanocomposites mainly fracture with transcrystalline rupture mode. The reinforcing mechanism is maybe related to the hindrance effect of microcracks propagation and the pinning effect for the dislocations movement, as well as the residual compressive strength due to the Al2O3 nanoparticles doped.
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| 关 键 词： | 纳米金属陶瓷材料 机械性质 钨碳-钴-氧化铝 火花等离子体烧结 |
Fabrication and mechanical properties of WC-Co-Al2O3 nanocomposites by spark plasma sintering |
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| SHEN Jun,ZHANG Fa-ming,SUN Jian-fei.Fabrication and mechanical properties of WC-Co-Al2O3 nanocomposites by spark plasma sintering[J].Transactions of Nonferrous Metals Society of China,2005,15(2):233-237. |
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| Authors: | SHEN Jun ZHANG Fa-ming SUN Jian-fei |
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| Abstract: | Small amounts of nanocrystalline Al2 O3 particles were doped in WC-Co nanocrystalline powders to study their reinforcing effects, and spark plasma sintering technique was used to fabricate the WC-Co-Al2 O3 nanocomposites. Experimental results show that the use of Al2 O3 nanoparticles as dispersions to reinforce WC-Co composites can increase the hardness, especially the transverse rupture strength of the WC-Co hardmetal. With addition of 0.5%(mass fraction) Al2O3 nanoparticles, the spark plasma sintered WC-7Co-0.5Al2O3 nanocomposites exhibit hardness of 21.22 GPa and transverse rupture strength of 3 548 MPa. The fracture surface of the WC-7Co-0.5Al2O3 nanocomposites mainly fracture with transcrystalline rupture mode. The reinforcing mechanism is maybe related to the hindrance effect of microcracks propagation and the pinning effect for the dislocations movement, as well as the residual compressive strength due to the Al2 O3 nanoparticles doped. |
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| Keywords: | nanocomposites WC-Co-Al2O3 mechanical properties spark plasma sintering |
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