High Temperature Resistance Inorganic Tungsten Powder Coating

High performance propellant increase the temperature of solid rocket engine fuel gas, this requires the materials of high melting point and anti-impact. When temperature reaches 3000°C by 2000°C /s, there are huge temperature gradient and thermal press. Common metal material can hardly bear high power burning and physical crush of solid particle results from burning and explosion of rocket propellant. If erosion is severe, it will affect thrust and efficiency of generator.

Using coating technology will do benefits for the high temperature protection of metal parts. The common used coatings are refractory metal and alloy, refractory ceramic material、carbon material, boride and C/C composite material. But it has apparent shortcomings which are complex preparation processes, it is difficult for large and complicated structured accessories.

The components of environmental friendly high temperature resistance inorganic tungsten powder coating introduced in this article are: 20~60% liquid silicate, 3~20% phosphate aluminum powder, yttrium stable zirconium oxide powder 5~50%, tungsten powder 5~50%, titanium carbide powder 5~30%, zinc powder 5~25%. Among which, liquid silicate is the mixing solution of potassium silicate and sodium silicate. Silicate in solution takes part of 30~40%. Using distilled water to adjust viscosity of coating, the weight rate of the above material and water is 1: (4〜10).

Producing method:
1. Mixing phosphate aluminum powder, YSZ powder, tungsten powder, titanium carbide powder and zinc powder.
2. Adding the blended material into liquid silicate and stirring fully.
3. Adding distilled water. Stirring them by 1500〜2500rpm for 30 minutes in the stirring machine, the coating is obtained by going through 200 mesh.

Advantages: Using silicate as film forming matter, tungsten powder and titanium carbide powder can show high temperature resistance property of coating. Zirconium oxide has high temperature resistance property as well as low thermal conductivity to lower the temperature, its big expansitivity makes an improvement on low expansitivity of silicate coating to adjust the thermal expand of metal and avoid falling off.

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