Al-TiB
2 composite alloy powder was produced by a plasma arc CVD method using TiCl
4, BCl
3 and Al vapours. A plasma arc generated between a pair of Al or Al-Ti alloy electrodes was utilized both for the heating of reactants and for the vaporization of Al electrodes. The experimental results obtained are summarized as follows: (1) The reaction products were determined as Al-TiB
2 and Al-TiB
2-Al
3Ti composite alloys by X-ray diffraction method. (2) A plot of molar ratio of reactant vapour against TiB
2 content in the product showed a peak at molar ratio of TiCl
4 ranging from 0.6 to 0.63 in the mixture vapour of TiCl
4 and BCl
3. (3) Al-TiB
2-Al
3Ti composite alloy was formed when the molar ratio of TiCl
4 in CVD gas involving TiCl
4 and BCl
3 was larger than 0.5 and when Al-Ti alloys were used as electrodes. (4) The synthesized particles were considered to be consisted of the clusters of fine particles of Al-Ti alloy containing TiB
2 cores.
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