TiN添加量对WC-TiC-TaC-8.0Co硬质合金组织与性能的影响  

Effect of TiN content on microstructure and properties of WC-TiC-TaC-8%Co cemented carbide

作　　者：王雁洁 刘咏[1] 杨新宇[2] WANG Yanjie;LIU Yong;YANG Xinyu(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China;Zigong Cemented Carbide Co.Ltd.,Zigong 643011,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410083 [2]自贡硬质合金有限责任公司,自贡643011

出　　处：《粉末冶金材料科学与工程》2020年第1期35-39,共5页Materials Science and Engineering of Powder Metallurgy

摘　　要：以TiN作为N源,采用传统粉末冶金法,一步烧结制备脱β层梯度WC-TiC-TaC-8.0Co硬质合金,利用扫描电镜等手段对合金的微观组织进行观察与分析,研究TiN添加量对合金物理与力学性能、微观组织及脱β层厚度的影响,并进行切削试验。结果表明:TiN添加量(质量分数,下同)在0~2.0%范围内,随TiN添加量增加,合金的密度、矫顽磁力以及硬度等无明显差异,但脱β层厚度明显增大。随TiN含量从0上升到2.0%,脱β层厚度从0增加到32.7μm。切削试验表明:TiN含量为1.0%时,涂层后硬质合金刀片具有最佳的车削寿命和抗冲击综合性能。Using TiN as N source,WC-TiC-TaC-8.0Co cemented carbide withβ-Delamination gradient was prepared by one-step sintering with traditional powder metallurgy method.The microstructure of the alloy was observed and analyzed by means of scanning electron microscope,the effect of TiN addition on the microstructure,the thickness ofβ-layer,physical and mechanical properties was studied,and cutting test was also carried out.The results show that the density,coercive force,hardness and other physical properties of the alloy have no obvious variation with the increase of TiN content(mass fraction,the same below)in the range of 0−2.0%,but the thickness ofβ-layer obviously increases.With increasing TiN content from 0.5%to 2.0%,the corresponding thickness of cubic carbide free layer increases from 0 to 32.7μm.The cutting test results show that the TiN content of 1.0%,cemented carbides has the excellent comprehensive properties of wear resistance and impact resistance after coating.

关 键 词：硬质合金 脱β层 TiN含量 微观组织 性能 

分 类 号：TF125.3[冶金工程—粉末冶金]