A kind of preparation method of aluminum nitride ceramics with high thermal conductivity
A technology of aluminum nitride ceramics and high thermal conductivity, which is applied in the field of preparation of aluminum nitride ceramics with high thermal conductivity, can solve the problems of limited size and size of the forming block, low production efficiency, slow processing speed, etc., and achieve sintering time Shortening, production cost reduction, and the effect of low production cost
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Embodiment 1
[0023] Weigh aluminum nitride powder and yttrium oxide powder according to the mass ratio of 97:3, the mass of aluminum nitride powder is 1940g, the mass of yttrium oxide powder is 60g, and the ball, material, solvent ratio is 1:1:0.7. Ball mill, alcohol is 1400ml, zirconia ball is 2000g, mixing for 12 hours, taking and drying, drying time is 12 hours. The agglomerated sample after drying was crushed and sieved to make it pass through a 20-mesh sieve. Weigh 1650g of the prepared material and perform isostatic pressing. Cut the formed powder into 4 triangles, brush a layer of boron nitride powder on the three sides of the triangle and join them together (such as figure 1 (Shown) installed in the mold. Then the mold is moved into the vacuum hot-pressing sintering atmosphere furnace for vacuuming, and the vacuum degree is maintained at about 3KPa. The heating rate is 10°C / min, and the temperature reaches 1820°C for heat preservation and pressure preservation. During the heating...
Embodiment 2
[0025] Weigh aluminum nitride powder and yttrium oxide powder according to the mass ratio of 98.5:1.5, the mass of aluminum nitride powder is 1970g, and the mass of yttrium oxide powder is 30g, and the ball, material, and solvent ratio is 1:1:0.7. Ball mill, alcohol is 1400ml, zirconia ball is 2000g, mixing for 12 hours, taking and drying, drying time is 12 hours. The agglomerated sample after drying was crushed and sieved to make it pass through a 20-mesh sieve. Weigh 1650g of the prepared material and perform isostatic pressing. Cut the formed powder into 4 quadrilaterals, apply a layer of boron nitride powder on the four sides of the quadrilaterals and join them together (such as figure 2 (Shown) installed in the mold. Then the mold is moved into the vacuum hot pressing sintering atmosphere furnace, the vacuum degree is kept at about 3KPa, the heating rate is 10°C / min, and the temperature reaches 1830°C for heat preservation and pressure preservation. During the heating p...
Embodiment 3
[0027] Weigh aluminum nitride powder and yttrium oxide powder according to the mass ratio of 95:5, the mass of aluminum nitride powder is 1900g, and the mass of yttrium oxide powder is 100g, and the ball, material, solvent ratio is 1:1:0.7. Ball mill, alcohol is 1400ml, zirconia ball is 2000g, mixing for 12 hours, taking and drying, drying time is 12 hours. The agglomerated sample after drying was crushed and sieved to make it pass through a 20-mesh sieve. Weigh 1650g of the prepared material and perform isostatic pressing. Cut the formed powder into equilateral hexagons, and brush the 6 sides of the hexagon with boron nitride powder. image 3 Shown are spliced together and installed in the mold. Then the mold is moved into a vacuum hot pressing sintering atmosphere furnace, the vacuum degree is kept at about 3KPa, the heating rate is 10°C / min, and the temperature reaches 1840°C for heat preservation and pressure preservation. During the heating process, the pressure starts...
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