摘要
通过SPS工艺制备了不同Mo含量的WC-6Co硬质合金,并采用XRD、SEM和摩擦磨损机分析了合金的物相组成、微观组织及力学性能,借助动电位极化曲线分析了合金的电化学腐蚀行为,从而研究Mo对合金微观组织、硬度、耐磨性及耐腐蚀性的影响。结果表明:添加Mo元素能够有效抑制WC晶粒的长大,利于提升合金硬度,但随着Mo含量的升高,合金致密度持续减小,其硬度先升高后降低,耐磨性能下降。Mo能有效增强硬质合金在酸性溶液中的耐腐蚀性;合金更容易受到盐酸的腐蚀,但SO4^2-对合金的腐蚀作用比Cl^-强,合金在硫酸中的腐蚀电流密度更大,腐蚀速率更快。
WC-6 Co cemented carbides with different Mo contents were fabricated by SPS.The phase composition,microstructure and mechanical properties of the alloy were analyzed by XRD,SEM and frictional wear machine.The electrochemical corrosion behavior of the alloy was analyzed by potentiodynamic polarization curves.And thus effects of Mo on the microstructure,hardness,wear resistance and corrosion resistance of the alloy were studied.The results show that Mo addition can effectively suppress the growth of WC grains and increase the hardness of the alloy.However,with the increase of Mo content,the relative density of the alloy gradually decreases,its hardness increases at first and then decreases,and its wear resistance also decreases.The corrosion resistance of the alloy in acid solution can be effectively enhanced by Mo addition.The alloy is more susceptible to corrosion by hydrochloric acid,but SO4^2- is more aggressive than Cl^- to corrode the alloy.The corrosion current density of the alloy in sulfuric acid is greater,and the corrosion rate is faster.
作者
严维
王水龙
郭圣达
郭建锋
黄星
陈颢
李律达
曹赛鹏
YAN Wei;WANG Shui-long;GUO Sheng-da;GUO Jian-feng;HUANG Xing;CHEN Hao;LI Lv-da;CAO Sai-peng(Faculty of Materials,Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China;Special Tungsten New Materials Engineering Technology Research Center of Jiangxi Province,Ganzhou 341000,China;Jiangxi Yaosheng Tungsten Co.,Ltd.,Ganzhou 341000,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2020年第4期73-78,共6页
Rare Metals and Cemented Carbides
基金
国家自然科学基金(51664023)
江西省教育厅项目(GJJ180431)
江西理工大学博士启动基金(jxxjbs18041)
江西理工大学大学生创新训练项目(DC2019-032)。
