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Preparation method of spherical spinel powder for thermal spraying

A spinel powder, thermal spraying technology, applied in coating, melting spraying, metal material coating process and other directions, can solve the problems of complex process and achieve the effect of improving the corrosion resistance of molten salt

Inactive Publication Date: 2013-09-18
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses oxides as raw materials, spray-dried to form agglomerate powders, and then undergoes plasma spheroidization or sintering densification before it can be used for thermal spraying, and the process is too complicated

Method used

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  • Preparation method of spherical spinel powder for thermal spraying
  • Preparation method of spherical spinel powder for thermal spraying
  • Preparation method of spherical spinel powder for thermal spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 20 kg NiFe 2 o 4 Powder, 200 g glycerin, 100 g sodium citrate, and 30 kg deionized water were placed in a vertical stirring mill and stirred at 200 r / min for 2 h to obtain a slurry with a solid content of 40% and stable suspension. After the slurry is prepared, pressure-type spray granulation is carried out, the inlet air temperature is 400°C, the outlet air temperature is 150°C, the spray pressure is 0.5 Mpa, and the yield is greater than 80%. The scanning photo of gained granulated powder is as figure 1 It can be seen from the figure that the shape of the product is spherical, the particle size is between 10 and 150 μm, the D50 of the product is 41.97 μm, the D90 is 129.60 μm, and the bulk density is 0.8 g / cm 3 .

Embodiment 2

[0032]Weigh 20 kg NiAl 2 o 4 Powder, 100 g of paraffin, 40 g of polyacrylamide, and 13.33 kg of deionized water were placed in a vertical stirring mill and stirred at 200 r / min for 2 h to obtain a slurry with a solid content of 60% and stable suspension. After the slurry is prepared, pressure-type spray granulation is carried out, the air inlet temperature is 180°C, the outlet air temperature is 80°C, the spray pressure is 2.0 Mpa, and the yield is greater than 78%. The scanning photo of gained granulated powder is as figure 2 It can be seen from the figure that the shape of the product is spherical, the particle size is between 20 and 120 μm, the D50 of the obtained product is 53.76 μm, the D90 is 114.34 μm, and the bulk density of the product is 1.49 g / cm 3 .

Embodiment 3

[0034] Weigh 10 kg ZnAl 2 o 4 Powder, 10 kg NiFe 2 o 4 , 400 g polyvinyl alcohol, 200 g carboxymethyl cellulose, and 8 kg ethanol were placed in a vertical stirring mill and stirred at 200 r / min for 2 h to obtain a slurry with a solid content of 70% and stable suspension. After the slurry was prepared, the centrifugal spray granulation was carried out, the air inlet temperature was 300°C, the outlet air temperature was 120°C, the atomizer speed was 30000 r / min, the peristaltic pump speed was 100 r / min, and the yield was greater than 90%. The scanning photo of gained granulated powder is as image 3 It can be seen from the figure that the appearance of the product is spherical, the particle size is between 10 and 50 μm, the D50 of the product is 37.82 μm, the D90 is 46.50 μm, and the bulk density of the product is 2.5 g / cm 3 .

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Abstract

The invention discloses a preparation method of spherical spinel powder for thermal spraying, and relates to a preparation method of spherical spinel powder for thermal spraying for improving the high temperature corrosion resistance by fluoride salt of materials. The method is characterized in that the preparation process comprises the step: spraying and prilling to obtain the spherical powder for thermal spraying by taking spinel type AB2O4 compound oxide as a raw material. The method provided by the invention is simple and feasible and can be used for large-scale production. The thermal spraying powder can be used for preparing anti-corrosive coatings of inert anodes of alloys for fused salt metallurgy, so that the fused salt corrosion of base bodies is improved.

Description

technical field [0001] The invention discloses a method for preparing spherical spinel powder for thermal spraying, and relates to a method for preparing spherical spinel powder for thermal spraying, which is used to improve the high-temperature corrosion resistance of fluoride salts. Background technique [0002] The current method of producing aluminum in the aluminum industry is to use the Hall-Herout electrolytic cell method, using self-consumed carbon anodes, in addition to producing a large amount of CO 2 In addition to greenhouse gases, it is often accompanied by the carcinogen CF n and asphalt fume emissions. In addition, because it is a self-consumable anode, the production unit ton of aluminum consumes up to 600kg of high-quality carbon materials. The carbon anode has poor electrical conductivity, low power efficiency, and particularly large power consumption. The current average power consumption per ton of aluminum in the aluminum industry is as high as 13200kWh...

Claims

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Application Information

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IPC IPC(8): C23C4/10C04B35/622B01J2/04C23C4/11
Inventor 张刚温合静杨建红杨文杰贺柳青
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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