Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第3期    总第228期    2018年3月

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文章编号:1004-0609(2018)-03-0556-09
SPS制备含钼WC-6Co硬质合金的工艺性能
郭圣达1, 2,鲍 瑞1,易健宏1,羊建高2,刘 亮1,杨 平1

(1. 昆明理工大学 材料科学与工程学院,昆明 650093; 2. 江西理工大学 工程研究院,赣州 341000)

摘 要: 以Mo粉、Co粉和自主研发的WC-6Co复合粉为原料,通过球磨、SPS制备Mo添加量为1%(质量分数)的细晶WC-6Co硬质合金。利用XRD、SEM、XPS、维氏硬度计和电化学工作站等研究SPS烧结温度、保温时间对合金组织和性能的影响。结果表明:随着SPS烧结温度的升高和保温时间的延长,WC-6Co-1Mo合金相对密度和断裂韧性持续增加,维氏硬度先增大然后略有下降。当烧结温度为1250 ℃、保温时间为5 min时,制备的合金综合性能最佳。与相同工艺制备的WC-6Co和WC-6Co-4Mo合金进行对比,发现添加适量Mo能够有效抑制WC晶粒的长大,提高合金的硬度和韧性,但相对密度减小;同时,也能够增强合金在HCl溶液的耐腐蚀性能。

 

关键字: WC-6Co硬质合金;Mo;烧结参数;显微组织;耐腐蚀性能

Effects of SPS sintering parameters on microstructure and properties of WC-6Co cemented carbides with Mo addition
GUO Sheng-da1, 2, RUI Bao1, YI Jian-hong1, YANG Jian-gao2, LIU Liang1, YANG Ping1

1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2. Project Research Institute, Jiangxi University of Science and Technology, Ganzhou 341000, China

Abstract:Using Mo powders, Co powders and WC-6Co composite powders as raw materials, the fine-grained WC-6Co cemented carbides with 1% Mo (mass fraction) addition were fabricated by ball-milling and spark plasma sintering technology. The effects of sintering temperature and holding time on the microstructure and properties of cemented carbides were investigated by XRD, SEM, XPS, Vickers hardness tester, electrochemical workstation, and so on. The results show that the relative density and fracture toughness of cemented carbides with 1% (mass fraction) Mo addition increase as the sintering temperature and holding time increasing. The Vickers hardness increases until the maximun value, and then follows a decreasing trend with the increase of sintering temperature and holding time. The best comprehensive properties achieve at temperature of 1250 ℃ ant holding time of 5 min comparing with WC-6Co and WC-6Co-4Mo cemented carbides prepared by the same processes. The results show that the appropriate content of Mo is beneficial for refining the WC grains, increasing the hardness and fracture toughness significantly. However, the relative density decreases with the addition of Mo slightly. Moreover, the corrosion resistance of WC-6Co cemented carbides in HCl solution increases with Mo addition.

 

Key words: WC-6Co cemented carbide; Mo; sintering parameter; microstructure; corrosion resistance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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