A micro-nano silicon carbide/calcium oxide stabilized zirconia spherical feeding material and its preparation method

Abstract

A micro-nano silicon carbide / calcium oxide stabilized zirconia spherical feeding material and a preparation method of the present invention, comprising: step 1, configuring ZrOCl 2 ·8H 2 O / Ca(NO 3 ) 2 4H 2 O mixed solution; step 2, add excess ammonia water dropwise to the mixed solution and continue stirring to generate a white precipitate, forming solution A; step 3, dissolving polycarbosilane in p-xylene solution to form solution B; step 4, dissolving the solution B and PVA aqueous solution are added to solution A to obtain a mixture; step 5, the mixture in step 4 is ball-milled in a roller ball mill to obtain a ball-milled slurry; step 6, the ball-milled slurry is carried out on a spray granulator Granulate, get dry Zr(OH) after dehydration 4 , Ca(OH) 2 and the spherical mixed powder of polycarbosilane; step 7, the spherical powder obtained after granulation is placed in a corundum crucible, and placed in a vacuum sintering furnace for calcination at high temperature, so that Zr(OH) 4 , Ca(OH) 2 And polycarbosilane (PCS) undergoes pyrolysis to form a uniform SiC / CSZ spherical feed.

Description

A kind of micro-nano silicon carbide / calcium oxide stabilized zirconia spherical feed and preparation method technical field The invention belongs to the micro-nano powder of high temperature protection technical field, be specifically related to a kind of micro-nano silicon carbide / oxidation Calcium-stabilized zirconia spherical feed and preparation method. Background technique Thermal barrier coating, as a special material, is coated on the surface of the hot end component, and has a good thermal insulation effect. It is used to reduce the influence of steam turbine or engine blades by high temperature environment, and reduce the impact of substrate wear, high temperature oxidation and other factors on the substrate. The destruction of the body can greatly extend the service life of the blade and increase the working temperature of the machine. Calcium oxide stabilized zirconia (ZrO 2 ) coating is currently the most promising thermal barrier material. Due to t...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a micro-nano silicon carbide / calcium oxide stabilized zirconia spherical feeding material and its preparation method, which solves the problems of coarse particle size, uneven composition, incomplete melting and poor density of the traditional feeding material

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