一种具有密度梯度的飞片材料的制备

本文作者使用Fe-Al烧结助剂,在1473 K的热压烧结条件下成功制备出了整体致密、密度沿厚度方向呈特定分布的W-Mo-Ti体系密度梯度飞片材料。研究表明,低熔点Al的添加,使部分烧结助剂Fe以液态形式存在,提高了Fe的活化烧结能力。W-Mo,Mo-Ti合金的烧结均为液相烧结过程,W-Mo合金主要通过形成少量粘结相和液相来粘结W,Mo晶粒,而Mo-Ti合金则通过形成部分Mo-Ti固溶体来实现致密化。

PREPARATION OF A KIND OF FLIER-PLATE MATERIALWITH GRADED DENSITY

A new kind of flier-plate material with graded density has come to show great potential for the application in dynamic high-pressure technology. In the present paper, W-Mo-Ti system was chosen to prepare such graded density flier-plate materials. It is found that the Fe-Al additives were suitable for the hot-pressing of W alloy, W-Mo alloys and Mo-Ti alloys at a low temperature of 1473 K. The mechanism of the densification could be expressed as follows: Part of Fe powders dissolved into the liquid due to the addition of Al and thus displayed more active feature during the sintering, which promoted the formation of bonding-phase in W-Mo alloys and solid solution in Mo-Ti alloys, and evidently improved their relative densities. Finally, a wholly dense W-Mo-Ti graded density flier-plate material was successfully fabricated. Its density changed gradually from 4.5×103 kg/m3 up to 17.0×103 kg/m3.