Cermet Powders Based on TiAl Intermetallic for Thermal Spraying

The paper presents a study of the formation process of cermet powders based on TiAl intermetallic with the addition of non-metallic refractory compounds. Non-metallic refractory compounds B4C, BN, SiC, and Si 3 N4 were chosen as strengthening components, improving the mechanical properties and resistance to high-temperature oxidation of TiAl-type intermetallic coatings. The composition of the initial mixtures was selected based on thermodynamic analysis of the interaction between TiAl intermetallic and non-metallic refractory compounds. As a result of the mechanochemical synthesis of powder mixtures, 73TiAl-27B 4 C, 69TiAl-31BN, 88TiAl-12SiC, and 83TiAl-17Si 3 N4 (wt. %) cermet powders are formed, consisting of titanium aluminide (TiAl, Ti 3 Al) phases and refractory compounds of aluminium (AlB2 and AlN) and titanium (TiB 2 , TiC, TiN, Ti5Si 3 ). The conglomeration technology of produced cermet powders has been developed to enhance fluidity. Using conglomerated powders will provide their constant feed to the high-temperature jet and the formation of dense coatings during thermal spraying.