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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

Inactive Publication Date: 2010-05-05
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to control the distribution of the gel network in the green body and the strength of the green body by controlling the content of the monomer used for the gelation reaction in the gel injection molding and the ratio of the monomer to the crosslinking agent, and solve the problem of drying process. Deformability problems in
It can realize near-net size to prepare large-size and complex-shaped ceramic green bodies

Method used

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  • Method for controlling deformation of ceramic blank in gel casting process
  • Method for controlling deformation of ceramic blank in gel casting process
  • Method for controlling deformation of ceramic blank in gel casting process

Examples

Experimental program
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Embodiment 1

[0034] Mix 20% 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 % silicon nitride powder and 3% sintering aid (Al 2 o 3 ;Y 2 o 3 ), adjust the pH value to 9-11, and prepare the slurry after ball milling for 12 hours; after the slurry is degassed in vacuum, add an initiator, degass it again, and inject it into the mold, and react for 30-60 minutes at 40-65°C The slurry is gelled and solidified, demoulded, and dried under the conditions of 25° C. and 98% humidity to obtain a green body. The deformation rate, shrinkage rate and bending strength of the obtained silicon nitride ceramic body are 3.5%, 2.9% and 27.9 MPa respectively.

Embodiment 2

[0036] Mix 55% 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 % silicon nitride powder and 3% sintering aid (Al 2 o 3 ;Y 2 o 3), adjust the pH value to 9-11, and prepare the slurry after ball milling for 12 hours; after the slurry is degassed in vacuum, add an initiator, degass it again, and inject it into the mold, and react for 30-60 minutes at 40-65°C The slurry is gelled and solidified, demoulded, and dried under the conditions of 25° C. and 98% humidity to obtain a green body. The deformation rate, shrinkage rate and bending strength of the obtained silicon nitride ceramic body are 0.6%, 1.95% and 60.2MPa respectively.

Embodiment 3

[0038] Mix 20% 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 % silicon nitride powder and 3% sintering aid (Al 2 o 3 ;Y 2 o 3 ), adjust the pH value to 9-11, and prepare the slurry after ball milling for 12 hours; after the slurry is degassed in vacuum, add an initiator, degass it again, and inject it into the mold, and react for 30-60 minutes at 40-65°C The slurry is gelled and solidified, demoulded, and dried under the conditions of 25° C. and 98% humidity to obtain a green body. The deformation rate, shrinkage rate and bending strength of the obtained silicon nitride ceramic body are 6.2%, 3.25% and 28.9 MPa respectively.

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Abstract

The present invention discloses a method for controlling the deformation of ceramic blank in the gel casting process which has the key point that in the gel casting process, the deformation of the ceramic blank is controlled in the drying process of the ceramic blank by controlling the content of monomer used for the gelling reaction and the proportion of the monomer to crosslinker in the slurry.The method is characterized in that acrylamide (AM) is used as the monomer and N, N'-methylene bisacrylamide (MBAM) is used as the crosslinker to prepare the slurry, the distribution of the gel network in the ceramic blank and the strength of the ceramic blank are controlled by controlling the content of the monomer used for the gelling reaction and the proportion of the monomer to crosslinker inthe slurry, and the problem of controlling the deformation of the ceramic blank in the drying process of the ceramic blank is solved.

Description

Technical field: [0001] The invention belongs to the field of porous ceramic preparation, and relates to a method for controlling the deformability of green bodies in gel injection molding technology. Background technique: [0002] With the continuous practical use of advanced ceramics with excellent characteristics, the demand for making ceramic parts with complex shapes is increasing. Forming technology is the prerequisite for the preparation of ceramic parts. However, traditional processes such as dry pressing, molding, grouting, injection and other forming methods are increasingly unable to meet the forming requirements, which makes forming technology the key to the preparation of complex shaped ceramic parts. Therefore, in order to obtain advanced ceramic products with expected functions, the powder forming process is particularly important in the whole process of ceramic manufacturing. It is necessary to form a formed body with uniform density and high shape and dimens...

Claims

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Application Information

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IPC IPC(8): B28B15/00B28B1/14
Inventor 王红洁余娟丽严友兰浑丙利乔冠军
Owner XI AN JIAOTONG UNIV
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