Preparation method of spherical yttrium oxide powder for high apparent density thermal spraying

Abstract

The invention discloses a preparation method of spherical yttrium oxide powder for high apparent density thermal spraying. The method comprises the following steps: 1, preparation of yttrium oxide slurry: adding high-purity yttrium oxide serving as a raw material into a mixing container, adding deionized water into the mixing container, stirring, blending into slurry, adding a binder into the slurry, uniformly mixing, putting the mixed slurry into a sand mill, and carrying out high-speed ball milling to obtain yttrium oxide slurry; then guiding the slurry obtained after high-speed ball millingout of a sand mill, and obtaining yttrium oxide slurry; 2, spray granulation: putting the yttrium oxide slurry obtained in the step 1 into a spray dryer to prepare spherical yttrium oxide powder; and3, high-temperature sintering: placing the spherical yttrium oxide powder obtained in the second step in a high-temperature sintering furnace to be sintered, and performing high-temperature sinteringin two stages. According to the method, the solid content of the slurry is increased and microwave sintering is adopted in the preparation process, so that the spherical yttrium oxide powder for thermal spraying with high apparent density can be prepared, and the method is simple in process, free of chemical reaction and controllable in process adjustment.

Description

technical field [0001] The invention relates to the technical field of rare earth oxide powder preparation, in particular to a method for preparing spherical yttrium oxide powder for thermal spraying with high bulk density by increasing the solid content of slurry and adopting microwave sintering during the preparation process. Background technique [0002] Yttrium oxide exhibits superior performance in aviation, aerospace, atomic energy, ceramics, magnetic materials, luminescent materials, and glass coloring applications. It is mainly used in the manufacture of magnetic materials for microwaves and single crystals of important military materials. It can also be used in the manufacture of high-temperature heat-resistant alloys and aircraft nozzles. It has been widely used in the electronics industry and semiconductor industry, especially as a coating material for semiconductor etching machines to prevent plasma corrosion. With the development of science and technology, sphe...

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Problems solved by technology

[0004] a) During the preparation process of spherical yttrium oxide powder for thermal spraying, it is necessary to use high-purity yttrium oxide as raw material to prepare slurry through high-energy ball milling. In the slurry preparation step of the existing method, due to the use of traditional methods, the slurry The solid content is low, and the granulated spherical powder is mixed with hollow spheres, resulting in low bulk density of the final product;

[0005] b) Spherical powder is sintered directly in the muffle furnace. Since the heating method of the muffle furnace is relatively simple and the heating uniformity is poor, if the temperature is low during heating, the sintering performance will be poor and the bulk density will be low. If the temperature is high, the sintering performance will be poor. It will lead to ball-to-ball sticking, which also reduces the bulk density, resulting in a low bulk density of the final product

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