Abstract
To improve oxidation resistance of the titanium matrix composites, the network structured Ti-Al-Si coating was successfully prepared on TiBw/Ti6Al4V composites with network microstructure utilizing hot dip siliconizing and subsequent heat treatment. The cycle oxidation tests showed that the weight gains of the Ti-Al-Si coating were only 8.98%, 5.99% and 3.65% of the TiBw/Ti6Al4V composites at 973K, 1073K and 1173K for 100 h. This result indicates super oxidation resistance of the network structured Ti-Al-Si of TiBw/Ti6Al4V composites, which can be ascribed to the three reasons: (1) the continuous Al2O3 oxide scale was formed in the outermost layer, (2) there were no cracks existed in the oxidized coating due to the unique network structure of the coating, (3) the Ti5Si4 layer in the interface could effectively retard the interfacial reaction between the Ti(Al,Si)3 coating and composite substrate.
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