Injection molding of micro-porous titanium alloy with space holder technique

The powder space holder （PSH） and powder injection molding （PIM） methods have an industrial competitive advantage because they are capable of the net-shape production of micro-sized porous parts. In this study, micro-porous Ti6Al4V alloy （Ti64） parts were produced by the PSH-PIM process. Ti64 alloy powder and spherical polymethylrnethacrylate （PMMA） particles were used as a space holder material. After molding, binder debinding was performed by thermal method under inert gas. Debinded samples were sintered at 1250℃ for 60min in a vacuum （10-4 Pa）. Metallographic studies were conducted to determine densification and the corresponding microstructural changes. The surface of sintered samples was examined by SEM. The compressive stress and elastic modulus of the rificro-porous Ti64 samples were determined. The effects of fraction of PMMA on the properties of sintered micro-porous Ti64 alloy samples were investigated. It was shown that the fraction of PMMA could be controlled to affect the properties of the Ti alloy.

多孔钛板静态抗拉强度的研究

采用松装烧结技术在不同条件下制备出多孔钛板。利用扫描电子显微镜分析多孔钛板的形貌,研究多孔钛板的粉末粒度、压制压力、烧结温度及厚度对其静态抗拉强度的影响。结果表明,选用的粉末粒度越小,多孔钛板的抗拉强度越大;并且抗拉强度随着压制压力、烧结温度和厚度的增大而增大。

粉末轧制大尺寸多孔钛板制备工艺研究

以氢化脱氢钛粉为原料,采用粉末轧制和真空烧结技术,通过对喂料和烧结制备工艺的优化改进,制备出了过滤性能均匀,且宽度>400 mm的大尺寸多孔钛板。实验结果表明:限制式喂粉方式可实现定量喂料,能保证喂料的均匀性;加压限位烧结可以有效防止生料坯在高温烧结过程中发生翘曲变形;轧制多孔钛板过滤性能良好,其密度为2.85 g/cm^(3),最大孔径为37μm,透气度为150 m^(3)/(h·k Pa·m^(2)),同时对于5μm以上的气体粉尘过滤效率>99.99%,满足了过滤行业对大尺寸多孔钛板的需求。

松装烧结多孔钛板

介绍了松装烧结多孔钛板的制取工艺及性能。结果表明,通过控制粉末粒度、装料方式和烧结工艺,可以得到不同性能的、材质均匀的多孔钛板。所制得的φ320～380mm×10mm多孔钛板,已应用于工业废水处理装置,获得了良好的技术经济效益。