A Nano Titanium Oxide-Zirconia Tungsten Powder With High Infrared Radiation Performance

The composite material prepared by the composite powder obtained by uniformly doping the metal-based particles with the nano ceramic powder not only has excellent toughness, thermal conductivity and the like of the metal, but also has high temperature resistance, wear resistance and corrosion resistance of the ceramic, and high hardness and highness. Chemical stability and other characteristics.

In practical applications, in order to ensure the uniformity of dispersion of composite particles and to maximize the performance of the material, it is often required to coat the doped phase particles on the surface of the matrix particles to form a coating layer to achieve the best mixing degree. For example, a liquid titanium pre-freezing-freeze-drying method is used to prepare a nano titanium oxide- zirconia-coated tungsten powder composite material which is considered to have high reflection and high infrared radiation performance. The preparation steps of the material are as follows:

(1) Weigh the butyl titanate, zirconium oxychloride and ammonium paratungstate crystal powder according to the molar ratio of titanium oxide, zirconium oxide and tungsten in the target composite powder to 0.5-1.5:0.5-1.5:7-9. Dissolved in deionized water to be clarified;

(2) Using a nitrogen lance, the clarified mixed solution is pre-frozen in liquid nitrogen to obtain a frozen product, and the pressure of the lance is 2-4 atmospheres;

(3) Placing the frozen product pre-frozen with liquid nitrogen in a lyophilizer for vacuum drying to obtain a lyophilized mixed powder;

(4) The lyophilized mixed powder is subjected to staged calcination reduction, the atmosphere is a hydrogen atmosphere, and the flow rate is 0.1-0.5 m3/h, and a composite powder of nano-titanium oxide zirconia-coated tungsten powder is obtained; Reduction, including two-stage process: the first stage is the reduction process, the reduction temperature is 600-900 °C, and the heat preservation is 2-4 hours; the second stage is the calcination decomposition process, the decomposition temperature is 900-1100 ° C, and the heat preservation is 2-3 hours. .

In the above process, the liquid nitrogen pre-freezing-freeze drying method is used to obtain an amorphous lyophilized powder by low-temperature low-pressure drying, which can effectively prevent segregation of single-phase particles. The nano-titanium oxide zirconia-coated tungsten powder composite material with high reflection and high infrared radiation performance is obtained by segmental calcination reduction, and the material has the advantages of ceramics and metals.

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