Method for reducing shrinkage rate of nano zirconium oxide ceramic dry-pressed molded product
A technology of nano-zirconia and dry-pressing, which is applied in the field of ceramic dry-pressing, can solve the problems of high friction between nano-powder and mold wall, poor pressure transmission of indenter, large pressure gradient, etc. The effect of increasing compact density and reducing shrinkage
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Embodiment 1
[0030] The method for reducing the shrinkage rate of nano-zirconia ceramic dry-pressed products in this embodiment comprises the following steps:
[0031] S1. Use Dow dispersant D3018 to configure zirconia slurry with a solid content of 45%, add dispersant B1022 to prepare spray granulation slurry for spray granulation, set the turntable frequency of the spray dryer to 30Hz, the feeding pump to 20Hz, and the outlet temperature to 120 ℃, spray granulation to obtain zirconia microspheres;
[0032] S2, heat preservation at 1300° C. for 1 hour, calcining micron zirconia granulated powder, and grinding;
[0033] S3. Add 180g of nano-zirconia powder and PVP grinding aid to 150mL of ethanol, and ball mill at 300r / min for 48h; add 20g of calcined zirconia granulation powder to the nano-zirconia ethanol solution, stir at a low speed for 6h, and dry the ethanol at 60°C , grinding to prepare micro-nano zirconia graded powder,
[0034] S4, forming the micro-nano graded powder by dry pre...
Embodiment 2
[0038] The method for reducing the shrinkage rate of nano-zirconia ceramic dry-pressed products in this embodiment comprises the following steps:
[0039] S1. Use Dow dispersant D3018 to configure zirconia slurry with a solid content of 55%, add dispersant B1022, prepare spray granulation slurry for spray granulation, set the turntable frequency of the spray dryer to 30Hz, the feeding pump to 20Hz, and the outlet temperature to 120 ℃, spray granulation to obtain zirconia microspheres;
[0040] S2, heat preservation at 1300° C. for 1 hour, calcining micron zirconia granulated powder, and grinding;
[0041] S3. Add 180g of nano-zirconia powder and PVP grinding aid to 150mL of ethanol, and ball mill at 300r / min for 48h; add 20g of calcined zirconia granulation powder to the nano-zirconia ethanol solution, stir at a low speed for 6h, and dry the ethanol at 60°C , grinding to prepare micro-nano zirconia graded powder,
[0042] S4, forming the micro-nano graded powder by dry press...
Embodiment 3
[0047] The method for reducing the shrinkage rate of nano-zirconia ceramic dry-pressed products in this embodiment comprises the following steps:
[0048] S1. Use Dow dispersant D3018 to configure zirconia slurry with a solid content of 65%, add dispersant B1022 to prepare spray granulation slurry for spray granulation, set the turntable frequency of the spray dryer to 30Hz, the feed pump to 20Hz, and the outlet temperature to 120 ℃, spray granulation to obtain zirconia microspheres;
[0049] S2, heat preservation at 1300° C. for 1 hour, calcining micron zirconia granulated powder, and grinding;
[0050] S3. Add 180g of nano-zirconia powder and PVP grinding aid to 150mL of ethanol, and ball mill at 300r / min for 48h; add 20g of calcined zirconia granulation powder to the nano-zirconia ethanol solution, stir at a low speed for 6h, and dry the ethanol at 60°C , grinding to prepare micro-nano zirconia graded powder,
[0051] S4, forming the micro-nano graded powder by dry pressi...
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