Microstructure And Properties Of Containing Tellurium Cobalt Powder Materials Research

Friction and wear phenomenon has a long history, is a pervasive feature of human life and working environment, and energy and economic losses caused incalculable. Therefore, related fields at home and abroad and scientific research institutes of science and technology workers paid great attention, and take the new material, new technology research in the first place. Thus developing new wear-resisting material is avoided and the best way to improve friction and wear failure problems, more to the research of this material has important practical significance.Cobalt-based alloy for its excellent high temperature performance, corrosion resistance and thermal fatigue properties are widely used in valve and valve seat workpiece etc of automobiles, trains and ships of engine, and in the use of harsh conditions for the valve sealing surface and the supercritical parameters of steam valve application, as hard alloy which exhibits superior scratch resistance under hot environmental conditions, wear resistance and corrosion resistance is higher. With the rapid development of industrial technology level, and parts of using at the harsh conditions put forward higher requirements, need to its abrasion resistance, resistance to high temperature corrosion and flue gas corrosion ability has greatly improved, more responsive to the requirements of complex conditions environment. Common parts of the preparation of cobalt-based alloy material on product quality and performance has been can not meet the requirement of using at the current conditions, such as nuclear power anti-wear plate and brake disc on the material properties is extremely demanding, therefore an urgent need to develop new wear resistance, high temperature gas corrosion excellent cobalt-based alloy material is the current focus. Tellurium has been hailed as a modern high-tech support materials, as alloy additives, is used to optimize the structure of alloy organization and improve the comprehensive mechanical properties of alloy. Researching that the Te element is added in the cobalt base alloy powder to prepare tellurium-cobalt-based alloy, refining grain, improving alloy structure, at the same time to form new wear-resistant phase(CoCrWTe), to improve the ability to resist wear and corrosion resistance of cobalt base alloy, and be used in the bad environment of valve sealing surface and the steam valve of supercritical parameters and the working condition of hot environment of wear resistant corrosion artifacts.By powder metallurgy technology prepare for cobalt-based alloy with different contents of Te, using the MEF-3 metallographic microscope and scanning electron microscope(SEM) to analysis alloy microstructure, the microstructure and wear morphology, and through the spectrometer(EDS) and X-ray diffraction(XRD) analyze the organization of alloy composition and wear-resistant phase; on the bloch hardness HB-3000 type instrument testing the hardness of alloy, in the MMW-1 vertical universal friction and wear testing machine testing friction coefficient, and in combination with the one over ten thousand electronic analytical balance FA2004 analyze alloy wear weightlessness. Through experimental study on the comparison and analysis, the results show that: the addition of micro Te has a lot to improve organizational structure and wear resistance of cobalt base alloy, and the grains of tellurium-cobalt-based alloy prepared under the 1.5%Te add quantity are more detailed, and grain boundary are more clearly, and organization is more dense ly. Alloy has the highest hardness and the youngest friction coefficient, porosity and oxidation residue on the surface of the alloy are sharply reduced. At the same time, Te added to form the new hard phase CoCrWTe, with the original hard phase CrCoWFe, Cr7C3, Cr5B3 firmly embedded in the substrate, having the effect of abrasion resistance, and the adhesive wear mechanism into a sliding wear, greatly reduce the wear process, and the impact on the microstructure of alloy is very good protection effect. The wear resistance of cobalt-based alloy under 1.5% content of Te performance improvement effect is best, having excellent wear resistance.