Method for eliminating ITO blank interlayer during pressure slip casting

A technology for grouting molding and eliminating pressure, applied in ceramic molding machines, die-casting molds, etc., can solve the problems of cracking of ITO blanks and unqualified products, preventing dehydration difficulties, preventing interlayer phenomenon, and reducing residual water. Effect

Inactive Publication Date: 2015-07-08
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
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Problems solved by technology

[0008] Finally, after the ITO green body is demolded, this interlayer is retained. In the subsequent drying process, the water in the ITO green body evaporates and causes shrinkage, causing changes in the internal stress of the green body, and the ITO green body is easy to appear along the middle interlayer. Cracking, resulting in defective products

Method used

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  • Method for eliminating ITO blank interlayer during pressure slip casting

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] Take 1432g of deionized water according to the solid content of 88% of the ITO powder, then select 94.5g of polyacrylic acid dispersant according to 0.9% of the total weight of the ITO powder, and select 31.5g of ammonia water with a concentration of 28% according to 0.3% of the total weight of the ITO powder. g, select 52.5g of polyacrylamide filter aid according to 5‰ of the total weight of ITO powder. Put polyacrylic acid dispersant, ammonia water and polyacrylamide filter aid into deionized water and stir evenly to obtain a mixed solution. Pour the mixed solution into the stainless steel tank, add each part of the ITO powder in three batches at a speed of 80r / min for stirring, and control the time of each batch of stirring and grinding at 15h, and the total time of three batches of stirring and grinding It is controlled at 45h, and the mass ratio of zirconia balls to the total weight of ITO powder is required to be controlled at 4:1, and the primary ITO slurry is ob...

Embodiment 2

[0045] Take 1167g of deionized water according to the solid content of 90% of the ITO powder, then select 162.75g of polycarboxylic acid dispersant according to 1.55% of the total weight of the ITO powder, and select 28% ammonia water according to 0.5% of the total weight of the ITO powder 52.5g, select polyacrylamide filter aid 210g according to 20‰ of the total weight of ITO powder. Put polycarboxylic acid dispersant, ammonia water and polyacrylamide filter aid into deionized water and stir evenly to obtain a mixed solution. Pour the mixed solution into the stainless steel tank, add each part of the ITO powder in three batches at a speed of 120r / min for stirring, and control the time of each batch of stirring and grinding at 10h, and the total time of three batches of stirring and grinding It is controlled at 30h, and the mass ratio of zirconia balls to the total weight of ITO powder is required to be controlled at 2:1, and the primary ITO slurry is obtained after stirring a...

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Abstract

Provided is a method for eliminating an ITO blank interlayer during pressure slip casting. 1167 g-1432 g of deionized water is selected according to the solid content of ITO powder, organic dispersants, ammonia water and filter aids are added to the ITO powder, stirring and grinding are conducted through a roller ball mill or a planetary ball mill, and therefore primary ITO slurry with the viscosity of 881 mPa*s-1300 mPa*s is obtained. Ageing is conducted for 10 h-15 h under indoor temperature conditions, then, ball milling is conducted for 3 h-5 h, and ITO slurry which has a high solid content and is prone to dehydration is obtained. Sieving is conducted through a 200-mesh sieve, defoaming is conducted through organic defoaming agents, and ITO slurry suitable for pressure injection is obtained. The ITO slurry is subjected to pressure slip casting, and demoulding is conducted after forming. A demoulded ITO blank is dried for two days under the temperature of 25 DGE C and then dried for three days under the temperature of 150 DGE C, and the dries ITO blank is obtained. A fracture of the ITO blank is sampled and observed under a scanning electron microscope, and the interlayer phenomenon is not found.

Description

technical field [0001] The invention belongs to the technical field of pressure grouting, and in particular relates to a method for eliminating the interlayer of an ITO green body during pressure grouting. Background technique [0002] ITO is the abbreviated name of Tin-doped Indium Oxide. The meaning of ITO refers to an indium tin oxide material. The ITO body is a body made of indium tin oxide. This article focuses on the cause of the interlayer in the flat ITO body and elimination methods. [0003] The mold used in the molding of the flat ITO green body is as follows: figure 1 As shown, the mold is composed of a mold frame, an outer mold, an inner mold, a cavity, a vacuum channel 9, a slurry inlet channel 11 and a drainage channel 10, wherein the mold frame is divided into a left mold frame 1 and a right mold frame 2, and the outer mold is divided into It is a left outer mold 3 and a right outer mold 4, and the inner mold is divided into a left inner mold 5 and a right i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/26C04B35/01
CPCB28B1/265C04B35/01
Inventor 杨硕王政红师琳璞
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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