Sintering behavior, microstructure and properties of TiC-FeCr hard alloy

来源 :Journal of University of Science and Technology Beijing | 被引量 : 0次 | 上传用户:yoyoluo5531
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TiC based cermets were produced with FeCr, as a binder, by conventional P/M (powder metallurgy) to near >97% of the theoretical density. Sintering temperature significantly affects the mechanical properties of the composite. The sintering temperature of >1360°C caused severe chemical reaction between TiC particles and the binder phase. In the TiC-FeCr cermets, the mechanical prop- erties did not vary linearly with the carbide content. Optimum mechanical properties were found in the composite containing 57wt% TiC reinforcement, when sintered at 1360°C for 1 h. Use of carbon as an additive enhanced the mechanical properties of the composites. Cermets containing carbon as an additive with 49wt% TiC exhibited attractive mechanical properties. The microstructure of the developed composite contained less or no debonding, representing good wettability of the binder with TiC particles. Homogeneous distribution of the TiC particles ensured the presence of isotropic mechanical properties and homogeneous distribution of stresses in the composite. Preliminary experiments for evaluation of the oxidation resistance of FeCr bonded TiC cermets indicate that they are more resistant than WC-Co hardmetals. TiC based cermets were produced with FeCr, as a binder, by conventional P / M (powder metallurgy) to near> 97% of the theoretical density. Sintering temperature significantly affects the mechanical properties of the composite. The sintering temperature of> 1360 ° C caused severe chemical reaction between TiC particles and the binder phase. In the TiC-FeCr cermets, the mechanical prop- erties did not vary linearly with the carbide content. Optimum mechanical properties were found in the composite containing 57 wt% TiC reinforcement, when sintered at 1360 ° C for 1 h. Use of carbon as an additive enhanced mechanical properties of the composites. Cermets containing carbon as an additive with 49 wt% TiC exhibited attractive mechanical properties. The microstructure of the developed composite contained less or no debonding, representing good wettability of the binder with TiC particles. Homogeneous distribution of the TiC particles deposited the presence of isotropic mechanical properties and h omogeneous distribution of stresses in the composite. Preliminary experiments for evaluation of the oxidation resistance of FeCr bonded TiC cermets indicate that they are more resistant than WC-Co hardmetals.
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