Cake forming method of high-purity alumina powder
A technology of high-purity alumina and molding method, applied in ceramic molding machines, manufacturing tools, etc., can solve the problems of friction pollution, uneven shape, etc., and achieve the effect of increasing the amount of charging, uniform shape and size, and uniform material
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Embodiment 1
[0016] Embodiment 1 is the best embodiment of the present invention, and concrete processing steps are:
[0017] 1. Mix 10 kg of alumina powder with a purity of 99.997% and a particle size (D50) of about 2.0 to 3.0 μm and 8 kg of deionized water evenly.
[0018] 2. Put 100g of the mixed material into a special PP or PTFE mould, transfer the 100 parts of the mold filled with the material to a low-pressure machine for low-pressure compression, and the pressure is controlled at 20Mpa.
[0019] 3. Take out the cake materials and put them in food vacuum packaging bags respectively, and vacuum and seal them in a vacuum machine.
[0020] 4. Transfer these sealed cake materials to an isostatic press for cold isostatic pressing, the pressing pressure is 250Mpa, and the pressure is kept for 170s.
[0021] 5. The 100 cakes pressed by cold isostatic pressing are then sintered at high temperature. The sintering temperature is controlled at 1550° C. and the time is controlled at 5 hours. ...
Embodiment 2
[0024] The specific forming process steps of high-purity alumina cake are as follows:
[0025] 1. Mix 10kg of alumina powder with a purity of 99.997% and a particle size (D50) of about 2.0-3.0μm and 0.4kg of deionized water evenly.
[0026] 2. Put all the mixed materials into special PP or PTFE molds according to the amount of 100g per part, transfer the 100 parts of the molds filled with materials to a low-pressure machine for low-pressure compression, and the pressure is controlled at 1Mpa.
[0027] 3. Take out the cake materials and put them in food vacuum packaging bags respectively, and vacuum and seal them in a vacuum machine.
[0028] 4. Transfer the sealed cake materials to an isostatic press for cold isostatic pressing. The pressing pressure is 110Mpa and the pressure is kept for 35s.
[0029] 5. The 100 cakes pressed by cold isostatic pressing are then subjected to high-temperature sintering, the sintering temperature is controlled at 1400° C., and the time is 8 hou...
Embodiment 3
[0032] The specific forming process steps of high-purity alumina cake are as follows:
[0033] 1. Mix 10kg of alumina powder with a purity of 99.997% and a particle size (D50) of about 2.0-3.0μm and 1.6kg of deionized water evenly.
[0034] 2. Put 100g of the mixed material into a special PP or PTFE mould, transfer the 100 parts of the mold filled with the material to a low-pressure machine for low-pressure compression, and the pressure is controlled at 30Mpa.
[0035] 3. Take out the cake materials and put them in food vacuum packaging bags respectively, and vacuum and seal them in a vacuum machine.
[0036] 4. Transfer the sealed cake materials to an isostatic press for cold isostatic pressing. The pressing pressure is 350Mpa and the pressure is kept for 200s.
[0037] 5. The 100 cold isostatic pressed cakes are then sintered at high temperature, the sintering temperature is controlled at 1650°C, and the sintering time is 4H. After sintering, high-density high-purity alumi...
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