Thermal spraying is the use of certain heat the coating material is heated to a molten or semi-molten state, and by means of high velocity gas stream and the flame to be atomized and to promote the atomized spray particles to the substrate surface, depositing as having a function of the coating. Thermal spraying can provide surface wear and corrosion resistance, high temperature coating. Coating material usually present between the substrate and the combination of three ways: mechanical bonding, physical bonding, and a metallurgical bond. With the low pressure plasma spraying, high-energy, high velocity plasma spraying, HVOF technology, to further improve the performance of the coating: the porosity can be reduced to 015% to 1%; coating and the substrate bonding strength can reach 70 ~ 140MPa. Studies show that using HVOF (HVOF) and plasma spray technology (ASP) technology, respectively, in 0Cr13Ni5Mo precision stainless steel tube prepared on the substrate of the iron -based amorphous alloy coating and iron-based amorphous and nanocrystalline coatings studied two kind of coating at room temperature friction and wear characteristics, the results showed that the two spraying preparation of iron -based coating have high hardness and low porosity, dense and showed a typical layered structure, improve the wear resistance of the coating.
To compensate for soft precision stainless steel tube does not wear, friction coefficient weakness common plating methods to improve precision stainless steel tube drive shaft with parts of the surface hardness and self- lubricating properties. Precision stainless steel tube is a surface easily passivated metal must be removed before the plating surface passivation film, precision stainless steel tube through to oil, impregnation, activation, and the pre-nickel plating processes, obtained chromium, zinc, copper, tin, precious metals coating. Studies showed that the base metal turbine precision stainless steel tube, and with the periodic inverted earth chrome plating, coating thickness of about 013mm, the coating phase and the rare earth metal-based salt particles of second phase composition, hardness can reach 900 ~ 1000Hv, anti-abrasion coating as a base material of 25 to 28 times, than the original product life of the high precision stainless steel tube 2 to 6 times.
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