The requirements of thermal spraying technology for carbide powder spraying are as follows:

Each particle has completed the formation of cemented carbide microstructure, coating formed by spraying process will not have obvious changes.

Requires good fluidity that is good sphericity and filler.

With extremely narrow particle size distribution, it is found that the performance of hard alloy powder for thermal spraying has been significantly improved by impact crushing volume crushing and airflow grading to remove too many edges and corners, which meets the requirements of thermal spraying workers.

Blade coating is a way to produce high quality coated paper. Scraper coating machine is a key component in the production process, the quality of scraper directly affects the quality of products and production efficiency. The traditional coating scraper is the spring steel blade after surface oxidation and bluing treatment. Steel blade scraper wear in the process of use, short life, need to change the knife frequently, low productivity; Steel scraper damaged uneven, often resulting in scraper line, thick coating and banner coating uneven paper disease, seriously affect the output and quality of products. With the increase of speed of paper machine, scraper becomes one of the most expensive and influential parts of coating machine. Ceramic coating spatula is a kind of spatula which is used for thermal spraying ceramic coating on the surface of pretreated steel sheet and precision grinding. Its wear resistance, long service life, the correct choice and use of ceramic scraper can increase output, reduce cost, increase productivity, improve and stabilize coating quality, reduce labor intensity. The current ceramic scraper is made by plasma spraying. Although the coating obtained by plasma spraying method has the advantages of smooth surface, low porosity, high binding degree, low oxide and impurity content of the coating, but the plasma equipment is expensive, the operation is complex, not suitable for field operation, the spraying size is small and other characteristics limit its popularization and application. Flame powder spraying is to use the heat generated by the combustion of gas to heat the powder spraying material, so that it reaches the melting or softening state, with the aid of flame flow energy or jet acceleration gas, powder spray to the substrate surface after pretreatment, forming a continuous coating.

The bonding strength, surface rockwell hardness, microhardness, porosity and wear resistance of coatings were determined by the national standard of thermal spraying technology and some general methods. The results show that the abrasion resistance of ceramic coating by thermal spraying is 3 times that of steel blade and 0.93 times that of plasma blade. It has been proved that high quality wear-resistant ceramic coatings can be obtained by applying thermal spraying technology with mature technology, simple operation and low cost and introducing reactive thermal spraying technology.

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