Y2O3改性Co黏结相对WC-10%Co硬质合金组织和性能的影响

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中文摘要：采用行星球磨法制备掺杂Y2O3 的Co复合粉末,再添加 WC粉末制得含Y2O3 的 WC-Co混合粉末,随后经SPS工序制得 WC-Co-Y2O3 硬质合金.采用扫描电镜、能谱仪、X射线衍射仪、维氏硬度计和摩擦磨损试验机研究了球磨时间对Co-1%Y2O3 复合粉形貌及物相,以及球磨时间、Y2O3 含量对 WC-Co-Y2O3 硬质合金微观组织、物相组成、密度、维氏硬度、断裂韧性和耐磨性能的影响.结果表明:添加Y2O3 后球磨,Co衍射峰向较大角度方向偏移;随着球磨时间的延长,Co晶粒被破坏,尺寸变小,导致Co衍射峰强度降低.硬质合金密度、维氏硬度及断裂韧性随着球磨时间的延长而提高,当球磨时间达到36 h后,合金硬度趋于稳定,而断裂韧性降低.合金密度、维氏硬度、断裂韧性和耐磨性随着Y2O3 含量的增加均出现了先上升后下降的趋势,当Y2O3 含量为1%时合金综合性能最佳.分步球磨添加稀土氧化物Y2O3 可以强化Co黏结相,抑制 WC晶粒长大,增强合金的力学性能.

外文标题：Effect of Y2O3 Modified Co Binder on the Microstructure and Properties of WC-10%Co Cemented Carbide

外文摘要：The Co composite powder doped with Y2O3 was prepared by planetary grinding,the WC-Co mixed powder containing Y2O3 was prepared by adding WC powder,and then WC-Co-Y2O3 cemented car-bide was prepared by SPS.Scanning electron microscope,energy spectrum analyzer,X-ray diffractometer,Vickers hardness tester and friction and wear testing machine were used to investigate the effects of ball milling time on the microstructure and phase composition of Co-1%Y2O3 composite powder,and ball mil-ling time and Y2O3 content on the microstructure,phase composition,density,Vickers hardness,fracture toughness and wear resistance of WC-Co-Y2O3 cemented carbide.The results show that the Co diffraction peak shifts towards a larger angle after adding Y2O3 and ball milling.As the ball milling time increases,the Co grains are disrupted and their size becomes smaller,leading to a decrease in the intensity of Co diffrac-tion peak.The density,Vickers hardness and fracture toughness of the cemented carbide increase with the extension of ball milling time.When the ball milling time exceeds 36 h,the hardness of the cemented car-bide tends to stabilize,while the fracture toughness decreases.The density,Vickers hardness,fracture toughness and wear resistance of the cemented carbide first increase and then decrease with the increase of Y2O3 content.The best overall performance of the cemented carbide is obtained when the Y2O3 content is 1%.The addition of rare earth oxide Y2O3 by stepwise ball milling can strengthen the Co binder,inhibit the growth of WC grains,and enhance the mechanical properties of the cemented carbide.

外文关键词：

WC-Co cemented carbideCo binderdoping Y2O3two-step ball millingmicrostructureme-chanical property

作者：

李宇涛、郭圣达、李金辉、陈颢、黄能、任洪宇、郭建锋、郭祥飞

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作者单位：

江西理工大学材料冶金化学学部,江西赣州 341000

江西耀升钨业股份有限公司,江西赣州 341300

赣州市钨产业技术研究院,江西赣州 341500

关键词：

WC-Co硬质合金 Co黏结相掺杂Y2O3 两步球磨微观组织力学性能

基金：

国家自然科学基金项目江西省主要学科学术和技术带头人培养计划领军人才项目江西省双千计划项目江西省重点研发项目江西省教育厅一般项目

项目编号：

5190412620225BCJ22013jxsq202310214820224BBE51041GJ220614

出版年：

2024

DOI：

10.19990/j.issn.1004-0536.2024.05.092.10

稀有金属与硬质合金

中国有色金属学会，长沙有色冶金设计研究院有限公司

稀有金属与硬质合金

北大核心

影响因子：0.32

ISSN：1004-0536

年,卷(期)：2024.52(5)