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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。
High-purity tungsten powder with particle size of 6 and 300nm was graded and mixed with TiH2 powder. After being isostatically pressed by cold isostatic pressing, W-10Ti alloy was prepared by liquid phase sintering. The effects of different tungsten powder sizes on the microstructure and phase composition of W-10Ti alloy were studied by testing the alloy densities and using XRD, SEM and TEM measurements. The results show that the W-10Ti alloy prepared with 6μm tungsten powder has a density of only 85%. However, the distribution of W and Ti in the microstructure is relatively uniform and the W-10Ti alloy with relatively pure phase structure is formed. All 300W tungsten powder, the alloy density can reach more than 97%, but the organization has more Ti-rich solid solution. When using the nano-micron W powder grading, the smaller the grading ratio is, the more W-containing solid solution is contained in the W-10Ti alloy, but the lower the density is. The grading ratio of 1: 2, the density can reach 95%, and the formation of a relatively single rich W solid solution phase.