Formation of High Temperature Compounds in W-C-B System by Reactive Spark Plasma Sintering

Abstract

The formation of high temperature composites in W-C-Bsystem from fine-grained powders in dependence on the ratio of components byusing reactive spark plasma sintering was studied. The mixture of W2Cand C nanoparticles was used as tungsten and carbon precursors. The W2Cand carbon mixture with different ratio of components was prepared by reductionof WO3 in presence of CH4 in nitrogen inductively coupledplasma. The specific surface area of the mixture was in the range of 36–42 m2/gin dependence on the content of carbon. The W2C and carbon particleswere mixed mechanically with amorphous boron and densified using the sparkplasma sintering technique at 1500–1700 oC and pressure of 30 MPafor 4 minutes. The sintered bodies contained WB2 and B4Cphases. The ratio of phase depends on the content of the components in the rawmixture. DOI: http://dx.doi.org/10.5755/j01.ms.21.3.7352