合金添加剂对WC基硬质合金氧化行为及其关联特性的影响

王春光; 张立; 黄祥; 聂仁鑫; 钟志强; 龙佳威

doi:10.19976/j.cnki.43-1448/TF.2023042

粉末冶金材料科学与工程 >

2023 , Vol. 28 >Issue 3: 296 - 304

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2023042

工艺技术

合金添加剂对WC基硬质合金氧化行为及其关联特性的影响

王春光 ,
张立 ,
黄祥 ,
聂仁鑫 ,
钟志强 ,
龙佳威

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1.中南大学粉末冶金国家重点实验室,长沙 410083;
2.崇义章源钨业股份有限公司,赣州 341300

收稿日期: 2023-04-03

修回日期: 2023-04-28

网络出版日期: 2023-07-06

基金资助

中南大学研究生创新项目(2021XQLH032,2022XQLH052); 中央资金引导地方科技发展资金资助项目(20231ZDH0 4044); 2021年湖南省研究生科研创新项目(150110030)

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Effects of alloy additives on oxidation behavior and correlative characteristics of WC-based cemented carbides

WANG Chunguang ,
ZHANG Li ,
HUANG Xiang ,
NIE Renxin ,
ZHONG Zhiqiang ,
LONG Jiawei

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1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Chongyi Zhangyuan Tungsten Co., Ltd., Ganzhou 341300, China

Received date: 2023-04-03

Revised date: 2023-04-28

Online published: 2023-07-06

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摘要

为了同步改善合金的高温抗氧化性能及物理与力学性能,设计WC-6Co-6Ni、WC-6Co-6Ni-1Cr₃C₂、WC-6Co-6Ni-1CeO₂和WC-12Co-1CeO₂等4组WC基硬质合金,分别对应1^#~4^#合金,对比研究合金的微观结构、物理与力学性能和700 ℃连续16 h的氧化行为。结果表明,CeO₂弥散相的存在不会导致WC基硬质合金强度降低,合金硬度遵循复合材料硬度及晶粒度和各相体积分数的耦合作用规律。4组合金中,4^#合金的硬度最高,其次为2^#合金,Co、Ni黏结金属对硬质合金硬度的影响显著。Cr₃C₂和CeO₂添加剂均可显著改善700 ℃下合金的抗氧化性能,但Cr₃C₂的改善效果明显优于CeO₂。在WC基硬质合金中添加适量的Cr₃C₂和CeO₂,并用Ni部分替代Co,可实现对合金高温抗氧化性能及物理与力学性能同步改善。

关键词： 硬质合金; 稀土; 微观结构; 性能; 高温抗氧化

本文引用格式

王春光 , 张立 , 黄祥 , 聂仁鑫 , 钟志强 , 龙佳威 . 合金添加剂对WC基硬质合金氧化行为及其关联特性的影响[J]. 粉末冶金材料科学与工程, 2023 , 28(3) : 296 -304 . DOI: 10.19976/j.cnki.43-1448/TF.2023042

Abstract

To explore the methods to improve the oxidation resistance at high temperature and the physical and mechanical properties simultaneously. Thus, this research designed WC-6Co-6Ni, WC-6Co-6Ni-1Cr₃C₂, WC-6Co- 6Ni-1CeO₂and WC-12Co-1CeO₂ WC-based cemented carbides, corresponding to alloys 1^#-4^#, respectively. The microstructure, physical and mechanical properties and oxidation behavior of the alloys at 700 ℃ for 16 h were investigated by comparison. The results show that the presence of rare earth-containing oxide dispersion phase in the alloy does not lead to the decrease of alloy strength, and the alloy hardness follows the coupling law of hardness, grain size and volume fraction of the phase components. The hardness of alloy 4^# is the highest, followed by alloy 2^#. The influence of Co and Ni binder metals on the hardness of cemented carbides is significant. Both Cr₃C₂and CeO₂ can significantly improve the oxidation resistance of the alloys at 700 ℃, but the improvement effect of Cr₃C₂ is better than that of CeO₂. The high temperature oxidation resistance and physical and mechanical properties of WC-based cemented carbide can be improved synchronously by adding appropriate amount of Cr₃C₂and CeO₂, and using Ni to partially replace Co.

Key words： cemented carbide; rare earth; microstructure; property; high temperature oxidation resistance

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