Effect of Relative Density on a Compressive Deformation Rate in Chromium Carbide Composite(Cr3C2+Cr7C3)and the Reliability in the Strength.

Abstract

The effect of relative density on a compressive deformation rate in chromium carbide composite (Cr3C2+Cr7C3) and the reliability in the strength was investigated. A chromium carbide sintered compact with a carbon content of 13.1wt% was fabricated from the high purity Cr3C2 powder with a particle size below 1μm. After being presintered at 1673-1773 K for 3000 sunder a vacuum of 0.13 Pa, the green compact was pressed isostatically at 150 MPa at 1623K for 3600s. The deformation rate in the composite with a lower relative density increases under a high compressive strength at an elevated temperature. But that with a higher relative density above 98% is hardly influenced by a stress. A HIP process is significantly effective in increasing in the density of the composite. The composite with a Weible parameter of 16.8 can be produced with a deflection of±15% in 2S/σm by the HIP.