日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 10 (2003),
pp. 622-628

Formation of TiB2-TixCuy Compound Layer on Ti Substrate by RF-Induction Heating of Ti-Cu-TiB2 Powder Mixtures

Long-Xian Ding, Keijiro Nakasa, Masahiko Kato and Jie-Ru Li\footnotemark[1]

Graduate School of Engineering, Hiroshima University, Higashi-hiroshima 739-8527

Abstract:

Radio frequency (R.F.) induction heating was applied to Ti, TiB2 and Cu mixed powder on a pure titanium substrate in vacuum. This method enabled the formation of a surface layer of TixCuy compounds (TiCu2 and Ti2Cu3) containing titanium di-boride (TiB2) particles. The layer with highest hardness (HV=8.0 GPa) and flat surface was obtained at a mixing ratio of Ti:TiB2:Cu=30:20:50(mol)%. The layer formation was completed in a shorter time by R.F. heating than normal electric furnace heating in vacuum. In case of R.F. heating up to 1170 K or 1220 K, TiB2 particles were distributed in lines in the TixCuy matrix, while TiB2 particles were homogenously distributed in case of electric furnace heating at 1223 K. Mixed powder initially melted at a temperature higher than 1170 K, and solidified by increasing the temperature to a higher value than 1240 K or with continuous holding at 1220 K. The reason for the solidification will be due to the decomposition of TiB2 and increase in melting point by the solution of boron into the melt.


(Received July 11, 2003)

Keywords:

radio frequency induction heating, Ti-TiB2-Cu powder mixtures, layer formation, titanium-copper compound, titanium boride


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