DEVELOPMENT FOR PLASMA SPRAYING OF COMPOSITE MATERIAL BASED ON OXIDE CERAMICS
Keywords:
composite material, use of SHS powders, oxide ceramics, plasma spraying, coatings, durability and reliability, heating rate of powder partsAbstract
The results of a study of powders of the following composition are presented: Al2O3+30%TiO2+12.5%MoS2; Al2O3+30%TiO2+12.5%CaF2. To obtain these compositions, the following dispersed materials were used: titanium PTM grade, aluminum oxide EBM-40, molybdenum disulfide MoS2 or calcium fluoride CaF. The synthesis of the compositions was carried out in a reactor in the self-propagation mode without supplying energy from an external source, in a nitrogen-oxygen environment with an oxygen content of 10 to 25 wt.% and a pressure of 0.1-0.9 MPa, which is necessary for the powder oxidation reaction titanium. For spheroidization, particles of the resulting composite powder were introduced into a plasma jet and sprayed into a steel cylinder 1 m long filled with argon. The coatings were applied using an APS air plasma spraying installation from Plasma-Tekhnik AG. The disadvantage of carbide ceramics with solid lubricant inclusions is high thermal dissociation during plasma spraying. During flight in a plasma jet, carbide ceramic particles are prone to loss of stability with a change in chemical composition, which leads to a high coefficient of friction for coatings and negatively affects their performance properties. A composite ceramic material based on oxide ceramics with the addition of a solid lubricant, obtained by the method of self-propagating high-temperature synthesis, has good technological characteristics, is resistant to maintaining the chemical composition during plasma spraying and is capable of forming coatings with high wear resistance and low coefficient friction.
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