Aluminum oxide-boron carbide composite ceramic core block and preparation method thereof
A technology of aluminum oxide and composite ceramics, which is applied in the field of composite ceramics preparation, and can solve the problems of large size of the green body mold, difficulty in forming thin-walled pellets, and complex molds, etc.
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[0032] The invention provides a kind of aluminum oxide-boron carbide (Al 2 o 3 -B 4 C) the preparation method of composite ceramic pellet, comprises the following steps: at first will comprise Al 2 o 3 , B 4 C. The mixture of coupling agent and binder is heated and granulated to obtain the feed material for preforming; an injection molding mold with a wall thickness of 0.8-1.2 mm is used, and the injection molding temperature is 150-175 ° C. Pressure 65~80kg / cm 3 Injection-molding the columnar material under certain conditions to obtain a green body; degreasing the obtained green body and then sintering to obtain a composite ceramic core block.
[0033] The method provided by the invention includes B 4 C. Al 2 o 3 , the mixture of coupling agent and binder is granulated to obtain the feed material for pre-molding; an injection molding mold with a wall thickness of 0.8-1.2 mm is used, and the temperature of injection molding is 150-175 °C and the pressure of injection m...
Embodiment 1
[0063] 1. Mixing
[0064] Al with an average particle size of 0.2 μm 2 o 3 Powder and B with an average particle size of 3.0 μm 4 C powder was dried at 200°C for 3 hours, and then the Al 2 o 3 , B 4 C powder was weighed according to the mass ratio of 80%:20% and preliminarily mixed: put the mixed powder into an appropriate amount of zirconia balls and absolute ethanol, and ball milled on a ball mill at a speed of 55 rpm for 8 hours. After drying the ball-milled slurry, use a beater to break up the block material, and weigh 1000 g of the total material after mixing for later use.
[0065] 2. Banbury
[0066] First add 10g of aluminate coupling agent evenly into the mixture. Weigh 131.58g of polypropylene PP, 157.90g of paraffin wax, and 26.32g of stearic acid SA. Turn on the heater of the internal mixer, control the temperature at 175°C, add all the PP into the internal mixing chamber, after the PP is completely melted, control the temperature at 165°C and add SA, wait ...
Embodiment 2
[0076] 1. Mixing
[0077] Al with an average particle size of 1.0 μm 2 o 3 Powder and B with an average particle size of 5.0 μm 4 C powder was dried at 200°C for 3 hours, and then the Al 2 o 3 , B 4 The powder C was weighed according to the mass ratio of 82%:18% and preliminarily mixed: the mixture was put into an appropriate amount of zirconia balls and absolute ethanol, and ball milled on a ball mill at a speed of 120 rpm for 6 hours. After the ball-milled slurry was dried in an oven at 80°C, the block material was crushed with a beater, and the total amount of the mixed material was weighed as 1000g, and set aside.
[0078] 2. Banbury
[0079] First add 10g of titanate coupling agent evenly into the mixture. Weigh 102.56g of PP, 153.84g of PW, and 25.64g of SA. Turn on the heater of the internal mixer, control the temperature at 178°C, add all the PP into the internal mixing chamber, after the PP is completely melted, control the temperature at 160°C and add SA, wai...
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