Impact of high wear-resistant molybdenum alloy on hard chromium chemical nickel
Hard chromium and chemical nickel have been widely used in related important components because of their excellent high hardness and high wear resistance. Will such functional coatings be replaced? Led by Henan University of Science and Technology, a new type of Molybdenum alloy, which has a room temperature strength of more than 1200 MPA, a high temperature (1300 ℃) strength of more than 250 MPA, and a high temperature wear resistance of 5 times better than pure Molybdenum, has recently been developed and passed the provincial scientific and technological appraisal. Molybdenum is an important strategic metal. Molybdenum and its alloys can be used as key components in aerospace industry, such as flame nozzles and combustors of engines, nose cones and nozzles of spacecraft, etc., the service conditions are harsh, but the high temperature wear resistance of the alloys used at present is not ideal. With the support of the National Natural Science Foundation of China and the National Development and Reform Commission, after eight years of tackling the key problems, the key enterprises of Henan University of Science and Technology have broken through the second phase size control, liquid-liquid doping synthesis of composite powder, isostatic pressing molding and pressure processing, and have successfully developed self-generated nano-Al2O3 ceramic particles to strengthen high temperature anti-wear Molybdenum alloy.
It is understood that the microstructure of the alloy at room temperature reaches Hv400, the particle size of the hard-phase alumina is about 500 nm, the interface of the hard-phase alumina is good, the high-temperature hardness of 1300 DEG C is more than Hv330, the high-temperature tensile strength is more than 250 MPa, the elongation is more than 20%, and the addition of the Al2O3 strengthens the base body, And the high-temperature abrasion resistance of the 10 vol% Al2O3/ Molybdenum alloy is about 5 times that of the pure graphite. The high-temperature hardness, strength and wear resistance of the new type of rare earth alloy are superior to that of the conventional TZM alloy and the rare-earth alloy. The new generation high-temperature wear-resistant alloy alloy researched by the Project can break the foreign block, effectively reduce the import dependence of high-performance ferroalloy products, meet the needs of the development of aerospace, metallurgy, chemical industry, electronic and the like, and the related products have been converted and produced in a plurality of enterprises, And the production value is more than 1 billion yuan. The project has successively applied for more than 20 invention patents, has the full independent intellectual property rights, and reaches the international advanced level. The hardness of hard chrome and chemical nickel can reach HV1000 and the manufacturing cost is relatively low as compared with the newly developed silicon alloy, so it is not completely replaced at present, and they will still play an important role in the field of each industry.
