Laser cladding transition metal silicide high-temperature wear-resistant and corrosion-resistant multifunctional coating technology

by:Caodahai     2021-09-26
In advanced defense equipment such as aviation, aerospace, weapons, ships, etc., a large number of key high-temperature sports auxiliary components can withstand strong friction and wear under harsh environmental conditions such as high-temperature oxidation, corrosion, and thermal corrosion. It is urgently needed to have excellent high-temperature wear resistance and excellent performance. High-temperature anti-oxidation and thermal corrosion resistance, low friction coefficient, excellent high-temperature self-lubricating performance, excellent high-temperature tribological compatibility, and excellent high-temperature long-term structural stability New technology for preparing high-quality coating (completely dense tissue, complete metallurgical bonding between coating and substrate). At present, the thermal spray coatings such as NiCr-Cr3C2, Co-WC, NiCr-Cr2O3, CoCr-Cr2O3, NiCr-Al2O3, which are widely researched and applied at home and abroad, are brittle, severely worn to the mating friction pair, and tribological Poor compatibility. In addition, the above-mentioned coatings can only be prepared by thermal spraying and other methods. Due to the inevitably a certain amount of looseness, microcracks, pores and other defects in the coating structure, especially between the coating and the part substrate In fact, it is a mechanical combination. Under the combined action of contact mechanical stress and thermal stress, it is prone to interface shedding. It is difficult to meet the performance requirements of a large number of key high-temperature wear-resistant moving parts in advanced defense equipment such as thruster aeroengines. Beijing University of Aeronautics and Astronautics, 'Laser Material Processing and Manufacturing Technology Laboratory,' internationally proposed 'transition metal silicide high-temperature wear-resistant and corrosion-resistant multi-functional coating materials and new areas of laser cladding preparation technology for high-quality coatings. Successful research Out of Cr3Si/Cr2Ni3Si, Cr5Si3/CrSi, Mo2Ni3Si/NiSi, Ti2Ni3Si/NiTi, Cr13Ni5Si2, Ti5Si3/NiTi2, Ni2Si/NiSi, etc., they also have excellent wear resistance, corrosion resistance, heat corrosion resistance, oxidation resistance, low friction, non-stick metal , 'Abnormal wear load characteristics (the amount of wear hardly changes with the increase of the wear load), 'abnormal wear rate characteristics (the amount of wear decreases with the increase of the wear sliding speed), 'abnormal wear temperature characteristics (the amount of wear changes with the wear test The new system of high-temperature, wear-resistant and corrosion-resistant multifunctional coating materials with special properties such as multi-element multi-phase transition metal silicide and its new technology for laser cladding preparation of high-quality coatings are used in aeroengines, petroleum, chemical, etc. There are broad application prospects in the wear-resistant sports pair of machinery and equipment such as ships. (The above is edited by the laser cutting machine manufacturer on the Internet)
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