Method for controlling deformation of ceramic blank in gel casting process
A gel injection molding, deformability technology, applied in manufacturing tools, ceramic molding workshops, ceramic molding machines, etc., can solve problems such as deformation, and achieve the effect of uniform distribution and small deformability
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[0033] Example 1
[0034] Mix 20% of the mixture (acrylamide and N,N'-methylenebisacrylamide), the ratio of monomer to crosslinking agent is 5, 2% dispersant, and water to prepare a premix. Add 40 to the premix % Silicon nitride powder and 3% sintering aid (Al 2 O 3 ; Y 2 O 3 ), adjust the pH to 9-11, ball mill for 12h to prepare slurry; after the slurry is vacuum degassed, add initiator, degas again, and then inject the mold, react for 30-60 minutes at 40-65℃ The slurry glue is solidified, demolded, and dried at 25° C. and 98% humidity to obtain a green body. The deformation rate, shrinkage rate, and bending strength of the prepared silicon nitride ceramic body are 3.5%, 2.9%, and 27.9 MPa, respectively.
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[0035] Example 2
[0036] Mix 55% of the mixture (acrylamide and N,N'-methylenebisacrylamide), the ratio of monomer to crosslinking agent is 5, 2% of dispersant and water to prepare a premix, and add 40 to the premix % Silicon nitride powder and 3% sintering aid (Al 2 O 3 ; Y 2 O 3 ), adjust the pH to 9-11, ball mill for 12h to prepare slurry; after the slurry is vacuum degassed, add initiator, degas again, and then inject the mold, react for 30-60 minutes at 40-65℃ The slurry glue is solidified, demolded, and dried at 25° C. and 98% humidity to obtain a green body. The deformation rate, shrinkage rate, and bending strength of the prepared silicon nitride ceramic body are 0.6%, 1.95%, and 60.2MPa, respectively.
Example Embodiment
[0037] Example 3
[0038] Mix 20% of the mixture (acrylamide and N,N'-methylenebisacrylamide), the ratio of monomer to crosslinking agent is 7, 2% dispersant and water to prepare a premix. Add 40 to the premix % Silicon nitride powder and 3% sintering aid (Al 2 O 3 ; Y 2 O 3 ), adjust the pH to 9-11, ball mill for 12h to prepare slurry; after the slurry is vacuum degassed, add initiator, degas again, and then inject the mold, react for 30-60 minutes at 40-65℃ The slurry glue is solidified, demolded, and dried at 25° C. and 98% humidity to obtain a green body. The deformation rate, shrinkage rate and flexural strength of the prepared silicon nitride ceramic body are 6.2%, 3.25%, and 28.9 MPa, respectively.
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