Gadolinium zirconate thermal barrier coating ceramic granulation powder for atmospheric plasma spraying and preparation method and application thereof

Abstract

The invention provides gadolinium zirconate thermal barrier coating ceramic granulation powder for atmospheric plasma spraying and a preparation method thereof, and belongs to the technical field of ceramic powder. Hydroxide with higher activity and lower hardness is adopted as a raw material, zirconium hydroxide and gadolinium hydroxide are subjected to high-energy ball milling, raw material powder obtained through treatment can achieve a solid-phase reaction at the low roasting temperature (800-1100 DEG C), meanwhile, the roasted gadolinium zirconate clinker is treated through high-energy ball milling, the gadolinium zirconate powder with the cubic pyrochlore structure, which is smaller in particle size (nanoscale), more uniform in particle size distribution and stable in structure, can be obtained; the defects of high reaction temperature, large particle size of prepared powder, non-uniformity and the like of the traditional solid-phase reaction method are overcome; polluting ions such as acid radicals and ammonia radicals are not introduced, the method has the advantages of energy conservation and environmental protection, and the ceramic powder with the particle size close to that of powder prepared through a chemical precipitation method can be obtained.

Description

technical field [0001] The invention relates to the technical field of ceramic powders, in particular to a gadolinium zirconate thermal barrier coating ceramic granulation powder for atmospheric plasma spraying and a preparation method and application thereof. Background technique [0002] With the rapid development of the aerospace industry, high flow ratio, high thrust-to-weight ratio, and high inlet temperature are the development directions of thermal engines (including gas turbines and aeroengines). The thrust of thermal engines can be effectively increased by increasing the inlet temperature of superalloy turbine blades. Ratio and driving force. The ever-increasing front gas inlet temperature reduces the reliability of high-temperature components in the combustion system and shortens their service life. The existing high-temperature alloys and cooling technologies have been difficult to meet the service requirements of the new generation of aero-engines. Practice has ...

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Problems solved by technology

The process of washing these polluting ions not only consumes a large amount of deionized water, but also causes environmental pollution and increases the cost of wastewater treatment, which does not meet the development requirements of future new material preparation processes

Moreover, some acid ions will inevitably remain in the powder prepared by the co-precipitation method, which may affect the performance stability of the powder and further affect the service life of the coating.

The raw materials used in the traditional solid-state reaction method are oxides of zirconium and gadolinium such as zirconia and gadolinium oxide. Although this process does not introduce polluting ions such as acid radicals and ammonia radicals, the raw material oxides used are compared with hydroxide and For salt substances, the raw material activity is lower, the powder is harder, the solid phase reaction temperature required is higher, and it is more difficult to be crushed to the nanometer scale by ball milling.

Compared with the chemical co-precipitation process, the particle size of the final powder obtained by the traditional solid phase method is generally large and uneven, which is difficult to meet the requirements of the atmospheric plasma spraying process for preparing thermal barrier coatings

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