真空烧结粉末冶金法制作钛合金试件的物理性能测试

研究真空烧结粉末冶金法制作钛合金试件的物理性能，方法：采用真空烧结粉末冶金法制作 钛合金试件，测试烧结收缩率、开口孔隙度。结果：在１００－３００ＭＰａ范围内，随着粉末的成形压力的增大，烧结收缩率和开口孔隙度减少；采用的３种钛粉末粒度对烧结体的物理性能没有影响。；钛粉镀铜镀锡组坯体烧结后线收缩率较其它粉末配方组大。

Study on Physical Properties of Titanium Alloy Sample Fabricated with Vacuum-Sintered Powder Metallurgy

OBJECTIVE: To investigate the physical properties of titanium alloy fabricated with vacuum-sintered powder metallurgy. METHODS: The titanium powders of three different particle sizes(-160mesh, -200 - +300mesh, -300mesh) were selected, and mixed with copper and aluminum powder in different proportions. Two other groups were made up of titanium powder(-200 - +300mesh) plated with copper and tin. The build-up and, condensation method and a double-direction press with a metal mold were used. The green compacts were sintered at 1000 degrees C for 15 minutes in a vacuum furnace at 0.025 Pa. In the double-direction press, the specimens were compacted at the pressure of 100 MPa, 200 MPa and 300 MPa respectively. Then the linear shrinkage ratio and the opening porosity of the sintered compacts were evaluated respectively. RESULTS: 1. The linear shrinkage ratio of specimens decreased with the increased compacted pressure(P < 0.05). There was no significant difference among the linear shrinkage ratios of three different titanium powders at the same compacted pressure(P > 0.05), but that of titanium powder plated with copper and tin was higher than those of other specimens without plating(P < 0.05). 2. The opening porosity of specimens decreased with the increased compacted pressure(P < 0.05). Three different sized particle of titanium powder did not affect the opening porosity at the same compacted pressure(P > 0.05). CONCLUSION: The composition of titanium-based metal powder mixtures and the compacted pressures affect the physical properties of sintered compacts. Titanium powder plated with copper and tin is compacted and sintered easily, and the physical properties of sintered compacts are greatly improved.