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现在,人们正试图更经济地用热等静压方法将予合金化的钛粉制成近成品形状的高强度的飞机构件。这种工艺所必须的粉末摇实密度至少为60%,这就要求粉粒形状接近于球形。用予合金化熔体离心雾化方法可以生产这种球形粉末,借助电弧或电子束来熔化物料。前者能较大量地生产粒度差异小的球形粉末,而后者则可得到更高的粉末纯度。真空电子束熔化的粉末不含有钨夹杂,但由于合金化元素的选择蒸发而使其存在偏
At present, people are trying to make hot-isostatic pressing of alloying titanium powder into a near-finished high-strength aircraft component more economically. The powder must have a tap density of at least 60% for this process, which requires the shape of the particles to be nearly spherical. This spherical powder can be produced by a centrifugal atomizing method using an alloying melt, which is melted by means of an electric arc or electron beam. The former produces spherical powders with small particle size differences in larger quantities, while the latter achieves higher powder purity. Vacuum electron beam melting powder does not contain tungsten inclusions, but due to the selective evaporation of alloying elements to make it exist partial