From ore to metal materials, the metallurgical industry goes through multiple production links, such as mining, transportation, storage, crushing, classification, separation, liquid-solid separation, pelletizing, sintering, smelting, casting, refining and so on. The main equipment in each link is under extremely bad working conditions such as high wear, high load, high temperature and corrosion. These factors lead to the failure of production equipment, making the metallurgical industry a major consumer of consumables and energy in the national economy. Faced with this situation, in order to maintain production, a large number of spare parts must be consumed every year, and some still need to be imported. A large iron and steel enterprise has to pay more than hundreds of millions of yuan every year. On the other hand, modern metallurgical production is a highly continuous process. Even if the equipment in each part of the production link fails prematurely, it will also cause shutdown or reduction of production and bring huge economic losses.
Then we can adopt the method of high temperature oxidation resistant coating. What are the functions of high temperature oxidation resistant coatings? The high temperature resistant coating is used to improve the high temperature performance of the matrix (equipment or facilities) (the higher temperature can reach 1150 ℃) so that it can withstand the high temperature chemical or physical dissolution process and the erosion process of mechanical damage, or both. What are the requirements for high temperature oxidation resistant coatings? In order to avoid the damage caused by high temperature oxidation, these coatings must: prevent the diffusion of oxygen in the atmosphere; Prevent the rapid diffusion of the coating itself to the substrate; Having a melting point higher than the operating temperature; Low vapor pressure at operating temperature. The recommended spraying materials are nickel chromium alloy, nickel chromium aluminum alloy, spray aluminum sealing and hot infiltration. The recommended spraying methods include plasma spraying, high-speed flame spraying and combustion flame spraying.
Application examples include furnace walls of heating furnace, soaking furnace, heat treatment furnace, sintering furnace, hot blast furnace, regenerative furnace and regenerator, and the surface of metal grate; Annealing plate, annealing hood, heat treatment fixture, outer surface of rotary kiln, high temperature valve, sliding gate, flue and chimney, etc. Polysilicon furnace, sintered metal forming, exhaust muffler, blast furnace tuyere, air supply system, sintering equipment, blast system, air purification system, smoke exhaust system, annealing furnace roll, Franklin furnace, hot metal impregnation heater, titanium strip, forging tools, heating hood, coke oven sealing device, blast cooling system, converter oxygen supply system, coke oven tuyere Continuous casting roll and cooling sand mold, etc.
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