Ce2O3含量对WC基硬质合金微观组织和性能影响
Effects of Ce2O3 Content on Microstructure and Properties of WC-based Cemented Carbide
张旭东 1李秀兰 1周新军 1蒋啸 1陈尧1
作者信息
- 1. 四川轻化工大学机械工程学院,宜宾 644005
- 折叠
摘要
以不同的WC粉末(铸造WC、球形WC和细粒WC)和Ni粉作骨架成分,CuNi合金为黏接金属,采用无压熔渗法在1 200℃下保温1 h制备WC基硬质合金,研究添加不同含量的Ce2O3(0,0.2%,0.4%,0.6%,0.8%和1.0%)对WC基硬质合金组织和力学性能的影响.结果表明,WC在试验温度下发生了不同程度的分解或溶解,同时熔渗过程中有新相生成,如C、W2C和Ni2W4C.微观组织中板条状形貌的WC有利于硬度和抗弯强度的提高,适量Ni2W4C相有利于冲击韧度的提高.当Ce2O3 含量为 0.6%时,合金硬度(HRA)和抗弯强度达到了最高值,分别为93.5和1 844.7 MPa;当Ce2O3含量为1.0%时,冲击韧度最高,为6.45 J/cm2.
Abstract
Taking different types of WC powders(cast WC,spherical WC,and fine-grained WC)and nickel powder as skeleton,and CuNi alloy as bonding metal,WC-based cemented carbide was fabricated by non-pressure fusion method at 1 200℃for 1 h.Effects of different amounts of Ce2O3(0%,0.2%,0.4%,0.6%,0.8%,and 1.0%)on microstructure and mechanical properties of WC-based cemented carbide were investigated.The results indicate that WC is decomposed or dissolved to varying degrees at experimental temperatures.Simultaneously,new phases,such as C,W2C,and Ni2W4C,are generated during fusion process.The plate-shaped WC in the microstructure is condu-cive to enhancing hardness and bending strength,while the presence of Ni2W4C is helpful to enhance impact toughness.Hardness and bending strength reach the maximum values of 93.5 HRA and 1 844.7 MPa,respectively,when Ce2O3 content is 0.6%,and the highest impact toughness of 6.45 J/cm2 can be obtained at a Ce2O3 content of 1.0%.
关键词
WC/硬质合金/Ce2O3/微观组织/力学性能Key words
WC/Cemented Carbide/Ce2O3/Microstructure/Mechanical Property引用本文复制引用
基金项目
四川省科技计划资助项目(2022YFG0289)
四川轻化工大学研究生创新基金资助项目(Y2023080)
自贡市科技局重点科技计划资助项目(2018YYJC08)
四川轻化工大学人才引进资助项目(2018RCL12)
出版年
2024
NETL
NSTL
万方数据