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采用高速压制(HVC)技术成形平均粒径分别为103、66和44μm的3种Ti6Al4V合金粉末,然后将合金粉末进行真空烧结,考察粉末粒径对成形效果和烧结体性能的影响。结果表明,细粉末比粗粉末更难压制,获得的压坯密度也更低。但是细粉末压坯的烧结密度明显高于粗粉末压坯的烧结密度。与粒径为103和66μm的粉末相比,粒径为44μm的粉末的压坯密度最低,在冲击能量为913J时其相对密度为85.1%。然而在1300°C烧结2.5h后,粒径为44μm的粉末压坯的烧结密度最高,其相对密度达到98.2%。而且,粒径为44μm的烧结试样具有最高的硬度和压缩强度,分别为HV354和1265MPa。
Three kinds of Ti6Al4V alloy powders with average particle sizes of 103, 66 and 44 μm were formed by high-speed pressing (HVC) technique. The alloy powders were then sintered in vacuum to investigate the effect of powder particle size on the forming effect and the sintered properties. The results show that the fine powder is more difficult to press than the coarse powder and the compact density obtained is also lower. However, the sintering density of the fine powder compact is significantly higher than the sintering density of the coarse powder compact. The powder with a particle size of 44 μm had the lowest density of the compacted powder with a relative density of 85.1% at an impact energy of 913 J as compared to the powder with the particle sizes of 103 and 66 μm. However, after firing at 1300 ° C for 2.5h, the powder compact with the particle size of 44μm had the highest sintering density and the relative density of 98.2%. Moreover, the sintered samples with a particle diameter of 44 μm had the highest hardness and compressive strength of HV354 and 1265 MPa, respectively.