FABRICATION PROCESS OF MICRO-CRYSTALLINE TUNGSTEN HEAVY ALLOY BY MECHANICAL ALLOYING AND RAPID TWO-STEP SINTERING

摘要

The present invention is mechanically alloyed to reduce the amount of tungsten powder of 91 wt% or more, and the remaining nickel powder and iron powder to the lamarilla spacing to 0.5 μm or less through ball milling, forming the obtained powder, and forming a known liquid phase After the solid-phase sintering in the temperature range of less than the sintering temperature, rapid liquid phase sintering for 1 to 60 minutes in the temperature range above the known phase liquid phase sintering temperature, a method for producing ultrafine tungsten polymer to provide. Here, it is preferable that the rapid liquid phase sintering time increases as the rapid liquid phase sintering temperature decreases. In addition, preferably, the volume fraction of the tungsten polymer alloy increases as the rapid liquid phase sintering temperature increases, or the tungsten-tungsten adjacency of the tungsten polymer alloy decreases as the rapid liquid phase sintering temperature increases, or the rapid As the liquid phase sintering temperature increases, the particle size of the tungsten polymer gold increases in the range of 6 to 10 mu m.