添加碳化钽对SPS制备钨块力学性能的影响  

Effect of TaC on Mechanical Properties of Sintered Tungsten by SPS

作　　者：马明亮 王青云 张文军 聂建航 孙真真 Ma Mingliang;Wang Qingyun;Zhang Wenjun;Nie Jianhang;Sun Zhenzhen(Luoyang SUNRUI Special Alloy Materials Co.,Ltd,Luoyang Henan 471000,China)

机构地区：[1]洛阳双瑞特种合金材料有限公司,河南洛阳471000

出　　处：《硬质合金》2019年第3期228-234,共7页Cemented Carbides

基　　金：国家重点基础研究发展计划(973计划)项目(课题)资助(2008CB717802);国际热核聚变实验堆(ITER)计划专项2010GB109000)

摘　　要：本文使用放电等离子烧结(SPS)的方法制备得到面向等离子体材料(高性能钨块).使用纳米和微米钨粉作为原料,加入不同计量的自制纳米碳化钽,采用密度测试、硬度、抗弯、金相、EDS、SEM等分析手段,研究了添加碳化钽对SPS制备钨块力学性能的影响,并对其机理进行探讨.结果表明,添加适量的碳化钽可以有效地提高钨块的相对密度、显微维氏硬度和抗弯强度,使用30nm钨粉添加2%碳化钽的钨块其相对密度达95.7%,显微维氏硬度值达540.4HV0.1,使用3μm钨粉添加2%碳化钽的钨块其相对密度达96.8%,抗弯强度达617.0MPa.其强化机理是添加的碳化钽呈粒状均匀分布于晶界,对于晶界起到了钉扎作用,从而细化了晶粒,使钨块强韧化.High performance tungsten blocks are successfully prepared by a spark plasma sintering process. The nano and micro meter W powders are chosen to fabricate the material, while the nano TaC powder is added. The effect of TaC on the mechanical properties of the W block fabricated by SPS is investigated by the way of density test, hardness, bending resistance, metallography, EDS and SEM. Meanwhile, the mechanism is discussed. The results show that proper TaC added to tungsten can raise relative density, Vickers micro-hardness and bending strength. The relative density of tungsten block produced by 30 nm tungsten powders with 2% TaC is 95.7%, and its Vickers micro-hardness is 540.4 HV0.1. The relative density of tungsten block produced by 3 μm tungsten powders with 2% TaC is 96.8%, and its bending strength is 617.0 MPa.The strengthening mechanism is that tantalum carbide is distributed in grain boundaries in granular form, which acts as a nail for grain boundaries,thus refining the grain and toughening the tungsten block.

关 键 词：钨 放电等离子烧结 碳化钽 显微硬度 抗弯强度 面向等离子体材料 

分 类 号：TL627[核科学技术—核技术及应用] TG146.411[一般工业技术—材料科学与工程]