Effects of Different Pressures on Laser Cladding Special Powder Prepared by Gas Atomization
摘要：
Gas atomization is characterized by higher sphericity,larger apparent density and better fluidity,suitable for preparing laser cladding special powder.Through the ingredient adjustment of thermal spraying powder Ni60,independently designed supersonic nozzle with confined type is put in use for the atomization,and the atomization experiments are performed under different gas atomization pressures,to obtain the laser cladding alloy powder with excellent performances.The results show that with the gas atomization pressure increasing,the particle mean diameter of powder decreases,as well as the volume mean diameter and Sauter mean diameter.Furthermore,the particle size decreases.In addition,the powder with properties of larger apparent density and better fluidity can be achieved to meet the requirement of laser cladding.But the gas atomization pressure might not increase without limit.The optimum gas atomization pressure is 7 MPa comprehensively,under which the experiments of laser cladding with coaxial feeding are carried on.Compared with the coating by cladding thermal spraying powder Ni60 under the same laser cladding parameters,the coating by the cladding self-designed powder embodies a smoother surface without cracks and pores,and the hardnesses of different coatings are approximately the same.
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DOI：
10.3969/j.issn.1001-4381.2013.07.010
被引量：
年份：
2013
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