Preparation method for silicon nitride heating body
A technology of a silicon nitride heating element and a manufacturing method, which is applied in the direction of heating element materials, can solve the problems of reducing safety and reliability, degrading the insulation performance of materials, and large grain boundary stress, so as to improve reliability and safety, Effect of eliminating material stress and promoting crystallization
Active Publication Date: 2013-05-08
JIANGSU JINSHENG CERAMIC TECH
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Abstract
The invention relates to a preparation method for a silicon nitride heating body. The preparation method comprises that silicon nitride powder and small amount of high-temperature liquid-phase sintering aid are arranged into absolute ethyl alcohol to be mixed, the mixture is made into a formula material through spraying granulation 10-72 hours after mixing; a metal heating wire is embedded into the formula material, the formula material is formed by drying and pressing; then the formula material is further formed by pressing through isostatic cool pressing of 180-220Mpa, pressure is maintained for 3-10 minutes, and the material is formed into a biscuit; then a boron nitride isolation layer is evenly coated on the surface of the biscuit, the biscuit is dried; the biscuit is sintered through hot pressing, sintering pressure is 20-30MPa, sintering temperature is from 1600-1900 DEG C, heat insulation time is 0.5-4 hours, and a blank is formed; and finally, the blank is arranged into a vacuum atmosphere furnace, constant temperature of 1300-1600 DEG C is kept for 10-24 hours, and then the blank is naturally cooled to room temperature. The boron nitride isolation layer is thick slurry formed by mixing the absolute ethyl alcohol with a mixture prepared by mixing the boron nitride powder and silicon nitride powder.
Application Domain
Heating element materials
Technology Topic
Silica fumeSilicon nitride +13
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