The Analysis Of Microstructure Of New Type Of Tellurium Nickel Chromium Alloy Powder Material

Nickel-chrome alloy with wear-resisting, corrosion resistant, high temperature oxidation and good comprehensive property has been widely used in petroleum, machinery, chemical and other industries. Petroleum, machinery, chemical and other industries every year due to the damage and losses of material wear and corrosion, fatigue, oxidation and fracture are quite amazing. In order to reduce the material in loss in these industries, this paper first studies adding a little of tellurium in nickel chrome alloy powder further increase the high temperature oxidation resistance, corrosion resistance and wear resistance and other properties of Nickel-chromium alloy. Adding different amounts of tellurium on the basis of the current nickel-chromium alloy powder(tellurium contents were 0%, 0.3%, 0.5%, 0.8%, 1%, 1.5%, 2.0%), evenly mixed, produce a new type of tellurium nickel-chromium alloy powder. Placing the prepared tellurium nickel-chromium alloy powder and sintering in quartz tube obtaine a new type of tellurium nickel-chromium alloy. Analyzing microstructure, chemical composition and phase composition of tellurium nickel-chromium alloy by electron microscopy, EPMA, XRD and other methods, and testing the hardness, study the influence of tellurium on microstructure of Nickel-chromium alloy. Through the above analysis, to determine the optimal composition of tellurium nickel-chromium alloy powder. Selecting the best composition ratio of tellurium nickel-chromium alloy, compared with the nickel-chromium alloy in the friction conditions and acidic environment, discusses the influence of tellurium on the properties of nickel chrome tellurium.The results show that:(1)with a little of tellurium in the nickel-chromium alloy , the alloy microstructure obviously changes, generatingβphase,γphase and tellurium-rich phase on the surface of the alloy.(2)The macro-hardness of tellurium nickel-chromium alloy is larger than nickel-chromium alloy; In the microhardness testing the matrix hardness of tellurium nickel-chromium alloy is larger than the matrix hardness of nickel-chromium alloy, the maximum microhardness isβphase in tellurium nickel-chromium alloy, as the hard phase, followed by theγphase. The microhardness ofβandγphase is larger than matrix microhardness in tellurium nickel-chromium alloy.(3)For adding amount of 1% of tellurium in nickel-chromium alloy, microstructure and hardness performance of tellurium nickel-chromium alloy is the best.(4)Friction and wear, corrosion tests show that the property of wear resistance and corrosion resistance of tellurium nickel-chromium alloy is significantly better than nickel-chromium alloy.