不同粒度W粉与TiH_2液相烧结制备W-10Ti合金  

Preparation of W-10Ti Alloy with Tungsten Powder of Different Sizes and TiH_2 Powder by Liquid Phase Sintering

作　　者：杨晓红[1] 孙特[1] 肖鹏[1] 梁淑华[1] 

机构地区：[1]西安理工大学,陕西西安710048

出　　处：《稀有金属材料与工程》2013年第7期1492-1496,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51201132;51174161);陕西省自然科学基金(2012JQ6013);陕西省教育厅科学研究计划项目(11JK0804);陕西省重点学科建设专项资金

摘　　要：以粒度6和300nm的高纯钨粉级配后与TiH2粉混匀,经冷等静压压制后采用液相烧结制备W-10Ti合金。通过测试合金致密度,利用XRD,SEM及TEM等测试手段,研究了不同钨粉粒度对W-10Ti合金显微组织和相组成的影响。结果表明:全部用6μm钨粉时,制备的W-10Ti合金致密度仅为85%;但组织中W和Ti分布比较均匀,形成相结构相对单一的富W固溶体。全部用300nm钨粉时,合金致密度可达到97%以上,但组织中有较多的富Ti固溶体。采取纳米与微米W粉级配时,级配比越小,W-10Ti合金中富W固溶体含量越多,但致密度越低。级配比为1:2时,致密度可达到95%,且形成相对单一的富W固溶体相。W-10Ti alloys were prepared with high purity 6 μm and 300 nm tungsten powder and Till2 powder as raw materials, which were mixed according to different graded proportions, compacted by the cold isostatic press, and sintered by the liquid sintering method. The density of W-10Ti alloys prepared with tungsten powder of different sizes was measured, and the microstructures and phase constituent of alloys were analyzed by XRD, SEM and TEM. The results show that the density of W-10Ti alloy prepared with all 6 p.m tungsten powder and Till2 powder is only 85%, but W and Ti are distributed uniformly, and almost single phase solid solution is formed in the microstructure. The density of W-10Ti alloy prepared with all 300 nm tungsten powder and Till2 powder is up to 97%, but more Ti rich solid solution is formed. When W-10Ti alloys prepared with W powder of different sizes and Till2 powder, the single phase W-rich solid solution in microstructures is increased and the density of alloys are lowered with the decrease of the graded ratio of nanoscale to micronscale tungsten powder. When the graded ratio of nanoscale W to micronscale W is 1：2, the density of W-10Ti alloy is 95%, and more single phase W-rich solid solution is formed.

关 键 词：W-10Ti合金 液相烧结 级配比 致密度 富W固溶体 

分 类 号：TF124.5[冶金工程—粉末冶金]