Study On The Optimization Of The Performance Of Ni60A Alloy Powder Prepared By Pressure Atomization Of True Air

At present,the powder metallurgy industry is becoming more and more important in China’s national economy.Because metal products have to withstand high temperature,high pressure,high corrosion and high erosion and other working conditions,so that their life is shortened.Therefore,the development of wear-resistant and corrosion-resistant coating technology has become an important challenge.Supersonic flame spraying and vacuum cladding are the core technologies of coating preparation,especially for Ni60A alloy powder,which has extremely high technical requirements.The real air atomization technology is the most commonly used technology in the preparation of high-end alloy powder.In the process of true air atomization powder,the blockage of liquid guide tube and the phenomenon of alloy melt backspray often occurs.These problems bring great challenges to the preparation process,which will lead to the poor performance of the prepared Ni60A alloy powder and the low yield of fine powder.Based on the above reasons,the CFD method is used to simulate the atomization process of Ni60A alloy powder prepared by true air atomization,and the influence of the gas flow field and the shape of the metal melt,the distribution of the powder and the performance of the fabricated powder.On the basis of numerical simulation analysis,on the premise that the Ni60A melt does not backspray and the diversion tube is not blocked,the applied pressure parameter is tested repeatedly to find the most appropriate pressure parameter.To verify the accuracy of the results,the production of Ni60A alloy powder was performed on the basis of varying the relevant parameters.For the Ni60A alloy powder,the composition,surface micromorphology,fluidity,loose packing density and particle size distribution were studied.After comparing the powder performance results before and after pressurization,it is found that the powder yield rate,powder particle size distribution and average particle size D50 have been improved.This paper focuses on the combination of practice and theory,guides the experiment with theory and numerical simulation,studies the optimal design idea of reasonable and feasible applied pressure,and finds the optimal pressurization parameters.The pressurization scheme effectively improves the powder yield and physical properties of Ni60A alloy powder.