Influence of Ar Pressure on Product Characteristics of Self Propagating High-Temperature Synthesis from WO_3/B_2O_3/Al Reactant System

摘要

Self propagating high temperature synthesis-casting, Phase separation, Tungsten boride, Aluminium tungsten Abstract Influence of Ar gas pressure on the SHS reaction products from WO_3/B_2O_3/Al system has been investigated. The pressure of Ar gas has a significant effect on the phase separation and microstructures of SHS products. Increase in Ar gas pressure has a effect on the phase compositions of SHS products and results in the increase of the amount of W_2B. Furthermore, the crystalize sizes of W_2B increase with the increase of Ar gas pressure from 0.3 to 0.5 MPa, respectively.