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Metal powder flame spraying process

Author: langfeng Time: 2017-11-16

Metal powder flame spraying process

1) The surface is subject to static load or low-speed sliding load, wear-resistant but the tensile strength of the coating and the substrate bonding requirements of not more than 50N / mm2 of the workpiece, the spray coating hardness HV130-350, coating thickness from 0.3 to several millimeters, spraying State surface roughness Ra10-25μm, the surface roughness of the coating after grinding up to Ra0.8-0.4μm, such as a variety of shaft bearing parts.
2) The requirements of cavitation erosion, water erosion and processing roughness of not more than Ra0.4μm surface, such as imported automobile crankshaft, train crankshaft, marine crankshaft and so on.
3) The material is copper alloy, aluminum or aluminum alloy and other non-ferrous metals, the need to restore the size or increase the surface wear resistance of the workpiece.
4) copper alloy, aluminum or aluminum alloy and other non-ferrous metal workpiece spraying the best choice of copper-based powder or aluminum powder.
5) Used in corrosive media, the coating should be dense and non-porous. Choose the suitable plastic, ceramic or anticorrosive metal to be used according to the working environment, working temperature, medium concentration and composition of the workpieces Pore ​​agent to seal the coating.
6) The bonding strength of the sprayed layer and the substrate: The tensile strength of the conventional flame sprayed coating is generally 20-30N / mm2. The ZK8032 powder multifunctional high speed flame spraying gun newly developed and manufactured by Shaanxi Zhongke Surface Engineering Co., The cast iron is sprayed on the sandblasting surface and sprayed on the aluminum clad nickel composite coating, the shear bond strength of the coating can reach 63.7N / mm2. Although the sprayed coating is not as strong as the bonding strength of the sprayed coating, After the failure of parts is sufficient to meet the needs.After calculation of scientific research units, in the liberation of CA141 car full load operation, the shear stress on the crankshaft seven main journals focus on a main journal only 15N / mm2; Dongfanghong 75 tractors Only 5.5N / mm2, these data is far below the shear strength of the spray coating.
7) Wear resistance of spray coating: Taking the painting of automobile crankshaft as an example, the sprayed main journal has higher abrasion resistance compared with the new crankshaft. Once our company sprayed the crankshaft of Nissan automobile produced in Japan, Check the amount of wear 0.022-0.03mm, while the main journal without repair wear 0.2-0.25mm, the amount of wear is almost ten times the difference, from this example can be described spray coating has good wear resistance, and even in the Under the condition of lack of oil, the engine can still run for a few hours without burning the tile and holding the axle.
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