Method for performing thermal spraying by using ceramic powder
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A ceramic powder, thermal spraying technology, applied in coating, fusion spraying, metal material coating technology and other directions, to achieve the effect of easy operation, improved utilization, and stable spraying power
Inactive Publication Date: 2012-06-20
JIANGSU WUJIN HYDRAULIC HOIST
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Abstract
Description
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Problems solved by technology
The existing ceramic spraying generally uses ceramic powder particles with a particle size of 15-45 μm, the roughness of the coating is generally greater than or equal to 0.3 μm, the hardness is about 800HV, and the powder deposition efficiency is about 40%.
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Embodiment 1
[0015] Take ceramic powder, wherein 50% of the ceramic powder has a particle size of 20-25 μm, 40% has a particle size greater than 25 μm and less than 35 μm, and 10% has a particle size of 35-40 μm.
[0016] 1) The ceramic powder is heated, melted or softened by a flame heating method;
[0017] 2) spraying the ceramic powder heated and melted or softened in step 1) onto the surface of the substrate;
[0018] 3) cooling, solidification, forming;
[0019] The size powders of the ceramic coating prepared in Example 1 are closely arranged and uniform, with a roughness of 0.12 μm, a hardness of 900 HV, and a powder deposition efficiency of 70%.
Embodiment 2
[0021] Take ceramic powder, wherein 45% of the ceramic powder has a particle size of 20-25 μm, 40% has a particle size greater than 25 μm and less than 35 μm, and 15% has a particle size of 35-40 μm.
[0022] 1) The ceramic powder is heated, melted or softened by the ion arc heating method;
[0023] 2) spraying the ceramic powder heated and melted or softened in step 1) onto the surface of the substrate;
[0024] 3) cooling, solidification, forming;
[0025] The size and size powders of the ceramic coating prepared in Example 2 are closely arranged and uniform, with a roughness of 0.15 μm, a hardness of 950 HV, and a powder deposition efficiency of 72%.
Embodiment 3
[0027] Ceramic powder is taken, wherein the particle size of the powder is 25 μm to 35 μm.
[0028] 1) The ceramic powder is heated, melted or softened by a flame heating method;
[0029] 2) spraying the ceramic powder heated and melted or softened in step 1) onto the surface of the substrate;
[0030] 3) cooling, solidification, forming;
[0031] The powders of the ceramic coating prepared in Example 3 are evenly arranged and compact, with a roughness of 0.2 μm, a hardness of 850 HV, and a powder deposition efficiency of 65%.
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Abstract
The invention relates to a thermal spraying method in the field, in particular to a method for performing thermal spraying by using ceramic powder. The method comprises the following steps of: 1) heating and melting or softening the ceramic powder by a heat source; 2) spraying the ceramic powder which is heated and molten or softened in step 1) onto the surface of a matrix; and 3) cooling, solidifying and forming, wherein the particle size of the ceramic powder is 20 to 40mu m. According to the method for performing thermal spraying by using the ceramic powder, the utilization rate of the ceramic powder is improved by performing thermal spraying by using the ceramic powder with the particle size of between 20 and 40mu m; a ceramic coating is compact and uniform; the spraying power is stable; the method can be easily operated by workers; the phenomenon that the surface of the coating is bumpy because the ceramic powder has larger particles and cannot be molten is avoided; and the roughness is less than or equal to 0.2mu m, so that the surface roughness of the coating is greatly reduced. The hardness of the coating is 850 to 1,000HV, the powder deposition efficiency is over 60 percent, and the harness of the coating and the power deposition efficiency are remarkably improved.
Description
technical field [0001] The invention relates to a thermal spraying method in the field, in particular to a thermal spraying method using ceramic powder. Background technique [0002] Thermal spraying is a method of preparing coatings and has become one of the new technologies for material surface protection and strengthening. It uses a heat source to heat, melt or soften the sprayed materials, and sprays them onto the surface of the substrate at a certain speed to form a coating. Its substrate can be almost all kinds of materials, including inorganic materials such as metal, ceramics, glass, and organic materials such as plastic, wood, paper, cloth, etc., and there is no limit to the size of the workpiece, as large as iron towers, bridges, and as small as mechanical parts. Spray to prepare the coating. Spraying materials can be metal materials, or inorganic non-metallic materials such as ceramics and ceramic-metal composite materials. Ceramic thermal spraying refers to a t...
Claims
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Application Information
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