Fabrication and mechanical properties of WC-Co-Al_2O_3 nanocomposites by spark plasma sintering  

Fabrication and mechanical properties of WC-Co-Al_2O_3 nanocomposites by spark plasma sintering

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作  者:沈军 张法明 孙剑飞 

机构地区:[1]School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

出  处:《中国有色金属学会会刊:英文版》2005年第2期233-237,共5页Transactions of Nonferrous Metals Society of China

基  金:Project(50374035) supported by the National Natural Science Foundation of China; Key Project(230103640324323) sup ported by Nano Science and Technology Fund of Heilongjiang Province; China

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-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 Al2O3 nanoparticles doped.Small amounts of nanocrystalline Al_2O_3 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-Al_2O_3 nanocomposites. Experimental results show that the use of Al_2O_3 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) Al_2O_3 nanoparticles, the spark plasma sintered WC-7Co-0.5Al_2O_3 nanocomposites exhibit hardness of 21.22 GPa and transverse rupture strength of 3 548 MPa. The fracture surface of the WC-7Co-(0.5Al_2O_3) 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 Al_2O_3 nanoparticles doped.

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 

分 类 号:TB383[一般工业技术—材料科学与工程]

 

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