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Pressureless Sintering of Tantalum Carbide Ceramics without Additives

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Using fine tantalum carbide (TaC) powder with narrow particle-size distribution, monolithic TaC ceramics with a relative density of 97.5% was obtained by pressureless sintering at 2300°C without adding additives. The monolithic TaC ceramics had a very fine microstructure with grain size of about 2 m. It is considered that the small particle size and uniform particle-size distribution of TaC powder are important factors for preparing dense TaC ceramics with fine microstructure. Otherwise, fast grain growth of TaC will occur. Compared with the reported values in literature, the monolithic TaC ceramics obtained demonstrated a high bending strength of 338±10 MPa.
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Document Type: Research Article

Affiliations: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai 200050, China

Publication date: 2010-02-01

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