Characteristics of high hardness alumina coatings formed by gas tunnel plasma spraying

Characterisation of thin α-Al2O3 tribo-coating deposited by low-power gas tunnel plasma spray

“…00-010-0425) are broad and low. The high-temperature plasma and rapid cooling rates during GTPS are believed to promote the phase transformation of γ -Al 2 O 3 to α-Al 2 O 3 [8][9][10]. The α-Al 2 O 3 possesses superior properties compared to other metastable alumina based on higher melting point, hardness, and denser structure [8][9][10].…”

“…Kobayashi [4][5][6]8] originally designed the GTPS, with the aim of rapidly depositing ceramic coatings with thicknesses of several hundred microns using plasma power ranging from 20 to 30 kW. Recently, a smaller-scale GTPS has been developed, which allows for operation at significantly lower input power (typically below 5 kW).…”

Corrosion Resistance of High Hardness TiN Coatings Prepared by Gas Tunnel Type Plasma Reactive Spraying

“…The qualities of some ceramic coatings produced by the gas tunnel type plasma spraying are superior than the conventional ones. 5) The alumina coating 6,7) and zirconia coating 8) produced are very dense and have higher hardness. 9) The gas tunnel type plasma reactive spraying of titanium powders in nitrogen atmosphere containing plasma gas has been applied for preparing TiN coating with high hardness.…”