成分配比对稀土钨电极材料组织及力学性能影响  

Effect of Composition Ratio on Microstructure and Mechanical Properties of Rare Earth Tungsten Electrode Materials

作　　者：王哲 王芦燕 章德铭 WANG Zhe;WANG Luyan;ZHANG Deming(BGRIMM Technology Group,Beijing 100160,China;Beijing Engineering Technology Research Center of Surface Strengthening and Repairing of Industry Parts,Beijing 102206,China)

机构地区：[1]矿冶科技集团有限公司,北京100160 [2]北京市工业部件表面强化与修复工程技术研究中心,北京102206

出　　处：《有色金属工程》2022年第8期55-61,共7页Nonferrous Metals Engineering

摘　　要：通过固液掺杂、等静压压制、中频烧结的方法,制备了不同的氧化镧、氧化钇、氧化锆三元掺杂成分比例的钨电极材料烧结棒材,探究了不同成分配比对样品显微组织、第二相粒子分布以及宏观力学性能的影响。结果表明,氧化镧、氧化钇、氧化锆三元复合添加能够有效改善第二相粒子在钨基体中的分布形态,降低第二相在晶界的过度富集,提高钨电极材料的综合力学性能。并且当添加成分镧、钇、锆质量比为3∶1∶1时,材料具有最好的综合力学性能,致密度可达96.04%,显微硬度可达549.37 HV_(0.3),抗压强度可达3 785 MPa,原因是此配比下第二相粒子最为细小均匀,弥散程度最高,对基体晶粒的细化作用最好,该配比下钨基体平均晶粒尺寸达到10.3μm。Sintered tungsten electrode materials with different proportions of lanthanum oxide,yttrium oxide and zirconia were prepared by solid-liquid doping,isostatic pressing and intermediate frequency sintering.The effects of different proportions of lanthanum oxide,yttrium oxide and zirconia on the microstructure,second phase particle distribution and macroscopic mechanical properties of the samples were investigated.The results show that the addition of lanthanum oxide,yttrium oxide and zirconia can effectively improve the distribution of the second phase particles in the tungsten matrix,reduce the over enrichment of the second phase at the grain boundary,and improve the comprehensive mechanical properties of tungsten electrode materials.When the mass ratio of lanthanum to yttrium zirconium is 3∶1∶1,the material shows optimal comprehensive mechanical properties,the density can reach 96.04%,the microhardness can reach 549.37 HV_(0.3),and the compressive strength can reach 3785 MPa.The reason is that under this ratio,the second phase particles are the smallest and uniform,the dispersion degree is the highest,and the refinement effect on the matrix grain is also optimal which is the average grain size of tungsten matrix is 10.3μm.

关 键 词：稀土钨电极 氧化物第二相 弥散强化 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]