クロム炭化物系セラミックス(Cr3C2)のHIP焼結性

概要

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Cr3C2 ceramics are expected to be applied to the furnace rail for slab reheating furnace in steel making industry, because of their better characteristics; high temperature stability, oxidation resistance and scale resistance. However, the effect of HIP conditions on the properties of Cr3C2 ceramics has not been clarified. This report deals with the degree of sintering of chromium carbide system ceramics with C/Cr atomic ratio of 0.54 to 0.83 by HIP. The results obtained are as follows: (1) The degree of sintering of chromium carbide is remarkably effected by carbon content. From the properties required, the content should be 13.4 wt%. (2) Chromium carbide green compact forms the dense layer by a presintering in vacuum. This compact can be consolidated by HIP above a relative density of 89%, compared to that of 95% without presintering. (3) Fracture toughness measured through D.T. method was 4.2 MPa⋅M11/2 and crack propargation velocity was 9×10-3m/s.
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