The Study Of Alloy Coating Technology By Using Anti-vacuum Fusion Sintering Nickel-based Alloy Powder With Addition Of Tellurium Element

By using the laser cladding technology on the damageable parts of the machineparts forming wear-resisting and corrosion resistant layer, which can be greatlyextend the service life of equipment and improve the production efficiency. Especiallyit can overcome the problem of the work-piece deformation and combined with lowstrength, existing in the surfacing welding and thermal spraying and ubiquity in thetraditional surface treatment technology, it with great development potential. But thequality problem of the nickel-based alloy laser cladding layer is still an importantfactor restrict the technology to the industrial application. Plus, because of highenergy beam cladding equipment price is higher, make its application anddissemination are difficult. Therefore, we further research the anti-vacuum fusionsintering technology which equipment requirement is simple and cost of low.According to appearance of the above, this subject explore adopting theanti-vacuum fusion sintering technology, preparation nickel-based coating withaddition of tellurium element. That is adding trace amounts of tellurium elements innickel-based alloy powder. Nickel-based cladding is prepared on the45#steelsubstrate with addition of tellurium element, by means of laying alloy powder directlyand adding binder. Put the prepared sample in the anti-vacuum box resistance furnace,heating up to950℃,1000℃,1050℃,1100℃, heat preservation30minutes to makenickel-based alloy powder with addition of tellurium element melting. Close theanti-vacuum box resistance furnace. Samples were cooled in the furnace to roomtemperature, taking out observation. By using scanning electron microscope, X-raydiffraction and electron probe, micro-hardness testing, friction and wear resistancetest, high temperature oxidation performance analysis, corrosion resistance andcorrosion behavior analysis, and other means. To research the microstructure ofstructure and mechanical properties of the nickel-based alloy cladding with additionof tellurium element.The results show that: Anti-vacuum fusion sintering nickel-based alloy powderwith addition of tellurium element at1050℃, the preparation of the nickel-based alloycoating with addition of tellurium element with45#steel substrate metallurgycombining good. The alloy coating with fine microstructure was dense, uniform, andthere was no flaw. The protruding black gray bone shape organization was distributedevenly on the surface, playing a supporting function of the matrix role to the whole alloy cladding. The hardness of the nickel-based alloy cladding was4~7times to the45#steel substrate. Friction coefficient stable over time，excellent resistance to wearability，high temperature oxidation resistance was increased significantly, with thevery good corrosion resistance performance.