A kind of zirconium boride plasma spraying raw material and preparation method thereof

Abstract

The invention belongs to the field of high-temperature-resistant stealth materials, and the product is suitable for hiding high-temperature parts of high-speed flying objects, and particularly relates to zirconium boride, an ultra-high-temperature conductive material. The invention prepares large-size zirconium boride spray coating raw materials by adding an appropriate amount of boron carbide on the basis of a pressure ring. The prepared large-grained zirconium boride spraying raw material has a particle size of 20-80 μm, and its particle size is controllable, the oxide impurity content is ≤0.1%, the purity is ≥90%, the density is high, and the melting point is 3040 ° C. It is suitable for plasma spraying to realize boron The stealth function of zirconium oxide. In addition, the sintering in the method of the present invention can adopt an economical and cheap pressureless graphite carbon tube furnace, and the production cost is low.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant stealth materials, and the product is suitable for hiding high-temperature parts of high-speed flying objects, and in particular relates to zirconium boride, an ultra-high-temperature conductive material, which is suitable for ion spraying raw materials. Background technique [0002] The zirconium boride with high conductivity is sprayed into a special pattern by plasma spraying to change the reflection angle of the electromagnetic wave emitted by the radar, so that the target can be prevented from being detected by the radar, thereby achieving stealth. [0003] The particle size of the raw materials required for plasma spraying is 20-80μm, which requires that the particle size of zirconium boride should not be too small. Zirconium boride powder with too small particles will be blown away instantly by the flame at high temperature, and cannot be used for plasma spraying. However, the zirc...

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Problems solved by technology

Moreover, the density of the zirconium boride materials synthesized by the above method is too low, and the impurity content is too high, so they cannot be directly used for plasma spraying.

[0004] If the carbothermal reduction method is used to increase the synthesis temperature to a very high temperature and extend the holding time to a very long time to synthesize zirconium boride under ultra-high temperature conditions, although it can achieve a relatively high density, which can crush zirconium boride with large particle size, but The content of oxide impurities is too high, and these oxide impurities will make the conductivity of zirconium boride very low, so that the high density synthesized in this way is not the density of pure zirconium boride, which is an invalid density. If it is used for spraying, the stealth performance of zirconium boride cannot be realized

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