炭化チタンウイスカーの育成と機械的性質の測定(<小特集>セラミック材料小特集)

概要

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Titanium carbide whiskers were prepared on a graphite substrate at 1250℃ by CVD method using gases of TiCl_4, CO arid H_2. The factors affecting growth of the whiskers were investigated. The presence of nucleating agents on the substrate showed a significant effect, and PtCl_4 was most effective. By treating graphite substrates with various concentration of PtCl_4 aq. solution, a desired dimension of whiskers could be prepared to some extent. X-ray diffraction revealed that the whiskers were titanium carbide with growth directions of <111> and <100>. Coating of the whiskers with Ni and Pt was performed by sputtering. Sputtered Ni on the whiskers revealed small droplets, whereas Pt was very smooth. The measurements of tensile strength showed the size effect and strength scatter similar to those reported on alumina whiskers. For the whiskers showing low strength, clear growth steps were found on the surface. The elastic moduli measured by 3-point bending also showed scatter and it may be explained by tapered shape of the whiskers. The effects of coating on strength and elastic modulus were not distinct.
社団法人日本材料学会の論文
1983-11-15