放电等离子烧结制备无粘结相SiC_(w)/WC硬质合金  

Preparation of binderless SiC_(w)/WC cemented carbides by spark plasma sintering

作　　者：王彬 陈睿智 李剑峰[1,2] 陈鹏起 程继贵 WANG Bin;CHEN Ruizhi;LI Jianfeng;CHEN Pengqi;CHENG Jigui(School of Material Science and Engineering,Hefei University of Technology,Hefei 230009,China;Research Centre for Powder Metallurgy Engineering and Technology of Anhui Province,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]安徽省粉末冶金工程技术研究中心,合肥230009

出　　处：《粉末冶金技术》2023年第1期38-43,共6页Powder Metallurgy Technology

基　　金：国家重点研发计划资助项目(2018YFC1901704)。

摘　　要：以碳化硅晶须(SiC whiskers,SiC_(w))作为增韧相,通过放电等离子烧结制备了无粘结相SiC_(w)/WC硬质合金。考察了放电等离子烧结温度及SiC_(w)添加量对SiC_(w)/WC硬质合金组织性能的影响。结果表明,采用放电等离子烧结在1800℃下可获得相对密度高于99%的WC烧结体,其维氏硬度和断裂韧性分别达到25.99 GPa和4.99 MPa·m^(1/2)。添加适量的SiC_(w)可以改善SiC_(w)/WC烧结性能和断裂韧性,在SiC_(w)的质量分数为0.6%时,断裂韧性达到6.80 MPa·m^(1/2),当添加过量的SiC_(w)时,增韧效果减弱。SiC whiskers(SiC_(w))/WC binderless cemented carbides were prepared by spark plasma sintering(SPS), using SiC_(w)as the toughening phase. The effects of sintering temperature and SiC_(w)content on the microstructure and properties of the SiC_(w)/WC cemented carbides were investigated. The results show that the WC sintered body with the relative density higher than 99% can be obtained by spark plasma sintering at 1800 ℃, and the Vickers hardness and fracture toughness reach 25.99 GPa and 4.99 MPa·m^(1/2),respectively. The sintering properties and fracture toughness of the SiC_(w)/WC sintered body can be improved by adding the appropriate amount of SiC_(w). The fracture toughness reaches 6.80 MPa·m^(1/2)with the SiC_(w)mass fraction of 0.6%. However, the toughening effect to the WC matrix decreases with the further increase of content SiC_(w).

关 键 词：无粘结相硬质合金 放电等离子烧结 SIC晶须 力学性能 

分 类 号：TG135[一般工业技术—材料科学与工程]