Silicon carbide ceramic surface preparation si 3 no 4 Method of Whisker Reinforcement of β-sialon Ceramic Coatings
A silicon carbide ceramic and ceramic coating technology is applied in the field of preparing Si3N4 whisker reinforced β-Sialon ceramic coating on the surface of silicon carbide, which can solve the problems of many impurities, high coating brittleness and high infrared emissivity, and achieves good toughness, The effect of low cost and low infrared emissivity
Active Publication Date: 2017-12-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the defects of existing ceramic coatings such as large brittleness, many impurity phases, and high infrared emissivity, and provide a Si coating with low emissivity and good toughness. 3 N 4 Method of Whisker Toughening Single Phase β-Sialon Ceramic Coating
Method used
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Embodiment 1
[0020] This embodiment is to prepare Si on the surface of silicon carbide ceramic substrate. 3 N 4 Whisker enhanced β-Sialon ceramic coating, including the following steps:
[0021] (1) Substrate treatment: select the silicon carbide ceramic substrate, use 200 mesh, 500 mesh, and 800 mesh sandpaper to grind successively until the surface of the substrate is smooth and flat, and then put the ground silicon carbide ceramic substrate into distilled water for ultrasonic cleaning for 15 to 25 minutes. Finally, put the substrate into an oven and dry it at 80°C for 2 hours;
[0022] (2) Preparation of glue: mix polyvinyl butyral and absolute ethanol with a mass ratio of polyvinyl butyral: absolute ethanol = 1:10, stir for 20 minutes, and prepare polyvinyl butyral glue solution;
[0023] (3) Preparation of ceramic slurry: Si 3 N 4 , AIN, AI 2 o 3 , Y 2 o 3 、Nd 2 o 3 The mixture is mixed with absolute ethanol, Si 3 N 4 , AIN, AI 2 o 3 , Y 2 o 3 、Nd 2 o 3 The diameter...
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Abstract
The invention discloses a method for preparing a Si3N4 crystal whisker-enhanced beta-Sialon ceramic coating on the surface of silicon carbide ceramic. The method comprises the following preparation steps of 1 matrix processing; 2 adhesive preparing; 3 ceramic slurry preparing; 4 slurry spraying; 5 sample drying; 6 sample sintering. The prepared Si3N4 crystal whisker-enhanced beta-Sialon ceramic coating is uniform and controllable in thickness, compact in structure and free of microscopic cracks. According to the method, the prepared Si3N4 crystal whisker-enhanced beta-Sialon ceramic coating is fewer in impurity, and the surfaces of Si3N4 crystal whiskers take part in a chemical reaction and are closely combined with a beta-Sialon ceramic matrix; the method has the advantages of being simple, flexible, efficient and easy for industrial application.
Description
technical field [0001] The invention belongs to the technical field of preparation of ceramic coatings, in particular to a silicon carbide surface preparation Si 3 N 4 Method for whisker-reinforced β-Sialon ceramic coatings. technical background [0002] Silicon carbide ceramics have a series of excellent characteristics, such as high temperature resistance, corrosion resistance, oxidation resistance, high strength, and thermal shock resistance. It is a good structural and functional integration material. However, silicon carbide coatings have poor wave-transmitting performance and high infrared emissivity, so they are not suitable for surface coatings of aerospace vehicles in the military industry. In addition, for high-temperature (>1600°C) environments, silicon carbide coatings are prone to rapid failure in a short period of time, and do not have the effect of anti-oxidation. It is an important means to solve this problem to use silicon carbide as the substrate or i...
Claims
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IPC IPC(8): C04B41/87
Inventor 陈照峰汪洋聂丽丽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS