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本工作通过氢氟酸和氟化铵混合液为活化液的常温超声波辅助活化处理,使其在W粉和Ti C粉表面获得均匀分布的缺陷(吸附质岛或台阶等),增加了粉体的表面活性。通过粉末冶金方法制备W-1.5%Ti C(质量分数)复合材料,采用场发射扫描显微镜(FE-SEM)研究分析了原始烧结粉体、活化预处理后烧结粉体和烧结后W-1.5%Ti C复合材料表面与断口形貌,对烧结机理进行了探讨。结果发现,相同烧结工艺条件下,经过活化处理后烧结粉获得的复合材料比原始粉相对密度提高7%,组织更致密。
This work through hydrofluoric acid and ammonium fluoride mixture as the activation liquid at room temperature ultrasonic assisted activation process to make the W powder and Ti C powder surface uniformly distributed defects (adsorbed island or step, etc.), an increase of powder Surface activity. The W-1.5% Ti C (mass fraction) composite was prepared by powder metallurgy method. The raw sintered powder, activated pre-treated sintered powder and W-1.5% Ti C composite surface and fracture morphology, the sintering mechanism was discussed. The results show that under the same sintering conditions, the relative density of the composite material obtained after the sintering treatment is 7% higher than that of the original powder, the structure is denser.