Method for preparing porous beta-SiAlON ceramic
A technology of ceramics and N elements, applied in the field of preparation of porous ceramic materials, can solve the problems of hydrolysis of AlN raw materials, uneven distribution of pore structure, and inability to control porosity, etc., and achieve the effect of meeting the requirements of dielectric properties
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specific Embodiment approach 1
[0011] Embodiment 1: This embodiment is a preparation method of porous β-SiAlON ceramics, which is specifically completed according to the following steps: 1. Prepare materials: according to the chemical formula Si 6-z Al z o z N 8-z , weigh Si according to the ratio of Si element, Al element, O element and N element molar ratio of 6-z:z:z:8-z 3 N 4 Powder, Al 2 o 3 powder and AlN powder; two, preparation of mixed powder: first with Si 3 N 4 The ball is a grinding ball, with absolute ethanol as the ball milling medium, the Si 3 N 4 Powder, Al 2 o 3 The powder and AlN powder were wet-mixed by ball mill for 18h~22h, and the mixed powder was obtained after drying through a 200-mesh sieve; 3. Preparation of SiAlON-β-SiAlON slurry: firstly, put the SiAlON, dispersant and mixed powder in a ball mill tank , and then ball milled at a temperature of 55°C~65°C for 12h~24h to obtain a uniform and stable alkene-β-SiAlON slurry; 4. Condensation: first preheat the polyethylene mo...
specific Embodiment approach 2
[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the dispersant described in Step 3 is Deqian 923S wetting and dispersing agent. Others are the same as the first embodiment.
[0022] The mixture of Deqian 923S wetting and dispersing agent Sergio electrically neutral polycarboxylate amine salt and modified polysiloxane described in this embodiment is operated by Guangzhou Jinhong Chemical Co., Ltd. The slurry of β-SiAlON original powder with alkenes as the solvent can improve the slurry stability and solid phase content of the slurry, so this embodiment chooses the Deqian 923S wetting and dispersing agent as the dispersant of this embodiment.
specific Embodiment approach 3
[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the cooling source described in step 4 is ice water, alcohol at a temperature of -60°C~-30°C, or alcohol at a temperature of -185°C Liquid nitrogen at ~-180°C. Others are the same as those in Embodiment 1 or 2.
[0024] Adopt following test to verify effect of the present invention:
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