2002 年 43 巻 5 号 p. 1197-1201
Sintered composites of WC–WB–W2B were prepared from B4C–W–WC powders using a reactive energization hot-pressing technique that initiated a solid state reaction between B4C and W. Below a WC mole fraction of 0.769 in the starting powder, WB and WC were formed according to the reaction B4C+5W+xWC=WB+(1+x)WC, while WB, W2B, and WC were produced above a mole fraction of 0.854. Densely sintered bodies were not obtained for pure WC. Composites of WC–WB–W2B obtained at WC mole fractions between 0.854 and 0.956 were fully consolidated, having high Young’s modulus and Vickers hardness values, and a fracture toughness which were comparable to those of WC.
