Study On The Microstructural And Friction And Wear Performance In Thermal State Of New Type Of Tellurium-Nickel-Chromium Alloy

In recent years, a kind of wear-resistant materials has become a hot research topic in the field of tribology which has good tribological properties from room temperature to the thermal state. In the21st century, the development directions of all kinds of mechanical equipment and industrial products are gradually come to long-life, highly efficient, low energy. So research and development the materials that have excellent friction and wear properties are imperative and significant.At present, Scattered tellurium element more and more widely used in the field of high and new technology industry, cutting-edge technology and national defense. Its important position has gradually revealed. Through a lot of experimental research, on the basis of the nickel-based self-fluxing alloy powder material which has developed by our team, developed a new type of Te-Ni-Cr alloy powder materials, It is a kind of excellent metal surface protection material and wear-resisting and corrosion-resistance material. It can be widely used in industry of oil drilling, water conservancy and hydropower engineering, industry of ship, mining machinery, the parts in these areas which have wear-resisting, corrosion-resistance and heat-resistance, such as mould, piston rod, screw feeding rod, sprocket, valve, valve seat, turbine blade, wheel, bucket tooth, etc.Using metallographic microscopy, scanning electron microscope (SEM), energy spectrum (EDS), X-ray diffraction (XRD) and macro hardness test, microhardness test, friction and wear testing, studied the changes of microstructure and performance of Te-Ni-Cr alloy, the study focus on the friction and wear behavior of the alloy during thermal state. The results show that: the addition of tellurium improved the microstructure of alloy, promote the precipitation of hard phase, increasing the hardness of alloy; Generate a white circle and dot shape tellurium-rich phase (σ phase), its microhardness is greater than the matrix phase, belongs to a new strengthening phase; Additive amount of tellurium reach1%(mass percent), the microstructure, hardness and wear performance of alloy are the best. The microstructure, hardness, friction and wear properties and friction coefficient (from room temperature to the thermal state are)of Te-Ni-Cr alloy are better than Ni-Cr alloy, shows that the addition of tellurium optimize, improve, enhance the comprehensive performance of the alloy.