热爆SHS法制备金属陶瓷块体工艺过程研究

Study on the Process of “Thermal Explosion” Self propagating High temperature Synthesis of Bulk Cermet

用热爆自蔓延高温合成法（ＳＨＳ法）简便、快捷地制备了钨基金属陶瓷块体，分析研究了影响热爆ＳＨＳ反应的各种因素；经对起始温度和稀释剂对材料气孔率的影响研究发现：起始温度的升高，稀释剂含量的减少，均有利于材料的致密化；而不同起始温度时，稀释剂含量对气孔率的影响存在一最佳值，该最佳值相对应的绝热温度在钨的熔点附近。

A bulk Tungsten based Cermet material is prepared by “thermal explosion” SHS method, a process provides simple, rapid and energy saving over more conventional routes. The effects of the properties of starting material, the amount of diluent and initial temperature( T 0) on the “thermal explosion” self propagating high temperature synthesis of bulk cermet are studied. The porosity of resultant material dependence on the processing parameters, such as initial temperature( T 0), grain size of starting materials, diluent content(m)and so on, is investigated. It is indicated that the resulted porosity decreases with the increasing initial temperature for thermal explosion. As for specific initial temperature, an optimum content of diluent exists which results a Tad corresponding to the melting temperature for tungsten.