Method of preparing alumina ceramic prilling powder for sealed ring
A technology of alumina ceramics and granulated powder, which is applied in the field of preparation of alumina ceramic granulated powder for sealing rings, which can solve the problems of increasing huge costs and achieve the effects of reasonable particle size distribution, moderate strength and high density
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[0013] A method for preparing alumina ceramic granulated powder for sealing rings, the preparation process comprising:
[0014] (1) Weigh α-alumina, silicon micropowder, light calcium carbonate, kaolin, calcined talc magnesia and yttrium oxide as ingredients, dry grind, pulverize and mix evenly. 99%, silicon micropowder 0-2.5%, light calcium carbonate 0-2%, kaolin 0-3%, calcined talc magnesium oxide 0.6%-3%, yttrium oxide 0.3%-0.5%;
[0015] (2) Place the above-mentioned uniformly mixed powder in a ball mill, dilute with pure water at a weight ratio of 1:0.8, and add dispersant, binder and release agent according to the composition, and ball mill to make a slurry; add The dispersant is 0.4% to 0.6% of the total weight of the ingredients, the binder is 1.2% to 2.0% of the total weight of the ingredients, and the release agent is 0.5 to 1.0% by weight of the total weight of the ingredients;
[0016] (3) The slurry made by the ball mill is passed through a 100-mesh sieve, and ir...
Embodiment 1
[0020] Raw material composition: α-Al 2 o 3 Micropowder 90%, silicon micropowder 2.5%, light calcium carbonate 2%, kaolin 3%, burnt talc 2%, yttrium oxide 0.5%.
[0021] Weigh, dry grind and mix uniformly according to the above composition requirements. Place the uniformly mixed powder in a ball mill, dilute with pure water at a weight ratio of 1:0.8, add 0.6% dispersant, 1.3% binder and 0.5% release agent, and ball mill for 24 hours to make a slurry. Pass the above-mentioned slurry through a 100-mesh sieve and remove iron, spray and granulate through a spray drying tower, the pump feed pressure is 1.8-2.2MPa, the inlet temperature is 350-380°C, and the outlet temperature is 105-120°C. Put the spray granulation powder in a mixer and mix for 0.5 hours, pass through 40 mesh and 200 mesh sieves, take the powder between the two layers of sieves, inspect, pack and store.
Embodiment 2
[0023] Raw material composition: α-Al 2 o 3 Micropowder 93.5%, silicon micropowder 1%, light calcium carbonate 1.5%, kaolin 2%, burnt talc 1.5%, yttrium oxide 0.5%.
[0024] Weigh, dry grind and mix uniformly according to the above composition requirements. Place the uniformly mixed powder in a ball mill, dilute with pure water at a weight ratio of 1:0.8, add 0.5% dispersant, 1.5% binder and 0.5% release agent, and ball mill for 24 hours to make a slurry. Pass the above-mentioned slurry through a 100-mesh sieve and remove iron, spray and granulate through a spray drying tower, the pump feed pressure is 1.8-2.2MPa, the inlet temperature is 350-380°C, and the outlet temperature is 105-120°C. Put the spray granulation powder in a mixer and mix for 0.5 hours, pass through 40 mesh and 200 mesh sieves, take the powder between the two layers of sieves, inspect, pack and store.
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