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.