(V,Cr,W)C复合粉末对WC-11Ni硬质合金微观组织及力学性能的影响  

Effects of(V,Cr,W)C Composite Powders on Microstructure and Mechanical Properties of WC-11Ni Cemented Carbides

作　　者：余碧荷 金永中 苏伟 钟健 赵建涛 曾守君 YU Bi-he;JIN Yong-zhong;SU Wei;ZHONG Jian;ZHAO Jian-tao;ZENG Shou-jun(Department of Meterials Science and Engineering,Sichuan University of Science and Engineering,Zigong 643000,China;Sichuan Province Key Laboratory of Material Corrosion and Protection,Zigong 643000,China;Zigong Zhongxing Wear-Resistant New Materials Co.,Ltd.,Zigong 643000,China)

机构地区：[1]四川轻化工大学材料科学与工程学院,四川自贡643000 [2]材料腐蚀与防护四川省重点实验室,四川自贡643000 [3]自贡中兴耐磨新材料有限公司,四川自贡643000

出　　处：《稀有金属与硬质合金》2023年第1期34-39,46,共7页Rare Metals and Cemented Carbides

基　　金：四川省科技厅重点研发计划项目(20ZDYF2629);四川省自然科学基金项目(2022NSFSC0342)。

摘　　要：以Cr_(2)O_(3)、WO_(3)、V_(2)O_(5)和炭黑为原料,采用碳热还原法在1500℃下反应2 h制备了(V,Cr,W)C复合粉末。采用XRD和SEM对(V,Cr,W)C复合粉末的相成分和显微组织进行了表征,研究了复合粉末的添加方式及含量对WC-11Ni硬质合金组织及力学性能的影响。结果表明,添加(V,Cr,W)C复合粉末的合金力学性能获得了显著提升,其抗弯强度、维氏硬度以及断裂韧性比未添加复合粉末的试样分别提高了19.97%、19.61%、12.18%。同时,添加(V,Cr,W)C复合粉末的合金性能优于添加(V,Cr)C复合粉末和添加WC+Cr_(3)C_(2)混合粉末的合金试样。另外,随着(V,Cr,W)C复合粉末添加量的增加,合金的抗弯强度、维氏硬度及断裂韧性均呈先增大后减小的变化趋势;当(V,Cr,W)C复合粉末的添加量为0.6%时,合金的抗弯强度、维氏硬度和断裂韧性达到最大值,分别为2835 MPa、1671 MPa、15.1 MPa·m^(1/2)。(V,Cr,W)C composite powders were prepared by carbothermal reduction method using Cr_(2)O_(3),WO_(3),V_(2)O_(5),and carbon black as raw materials at 1500℃for 2 h.The phase ingredients and microstructure of(V,Cr,W)C composite powders were characterized by XRD and SEM,and the effects of adding method and content of the composite powders on the microstructure and mechanical properties of WC-11Ni cemented carbides were investigated.The results show that the mechanical properties of the alloy are significantly improved by the addition of(V,Cr,W)C composite powders,and its flexural strength,Vickers hardness,and fracture toughness are increased by 19.97%,19.61%,and 12.18%,respectively,compared with those of the specimens without composite powders.The properties of the alloy with(V,Cr,W)C composite powders are better than those with(V,Cr)C composite powders and with WC+Cr_(3)C_(2)hybrid powders.In addition,the flexural strength,Vickers hardness,and fracture toughness of the alloy increase at first and then decrease with the increase of the addition of the(V,Cr,W)C composite powders.When the addition of the(V,Cr,W)C composite powders is 0.6%,the flexural strength,Vickers hardness,and fracture toughness of the alloy reach the maximum values of 2835 MPa,1671 MPa,and 15.1 MPa·m^(1/2).

关 键 词：(V CR W)C复合粉末 WC-Ni硬质合金 微量添加 显微组织 力学性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]