Abstract
High-temperature self-lubricating wear-resistant metal matrix composite coatings are fabricated on substrate of a (gamma) - TiAl intermetallic alloy Ti-48Al-2Cr-2Nb by laser cladding. The hybrid (gamma) -NiCr metal matrix composite coating is mainly reinforced by rapidly solidified wear-resistant phase of hyper-eutectic M<SUB>7</SUB>C<SUB>3</SUB> and self-lubricating particles of Ag and CaF<SUB>2</SUB> or CaAgF<SUB>4</SUB>. Microstructure and hardness within the whole laser clad composite coating is homogeneous and the bonding to the substrate is purely metallurgical. Both hardness and dry sliding wear resistance of the (gamma) -TiAl intermetallic alloy are significantly enhanced after laser cladding treatment.
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