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Improved grouting method for preparing special ceramic

A technology of special ceramics and grouting, which is applied in the field of preparation of special ceramic materials. It can solve the problems of ceramic sound, light, electricity, magnetism and other performance effects, difficulty in eating slurry for plaster molds, and affecting the fluidity of slurry, etc., to achieve low cost. , Not easy to deform, shorten the process time

Inactive Publication Date: 2015-03-25
AVIC BASIC TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dispersant added by the traditional grouting method is easy to bring in K and Na ions, which has a great influence on the acoustic, optical, electrical and magnetic properties of ceramics.
The binders such as PVA and PVP added by the traditional grouting method will react with water to become a viscous colloidal liquid, affecting the fluidity of the slurry, thereby reducing the solid content of the slurry
The slurry with low solid content will make it difficult for the gypsum mold to eat the slurry, and the slurry eating time is too long, so that the green body is delaminated and dried, and the shrinkage rate is large during the sintering process, resulting in deformation and cracking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: Forming of silicon nitride ceramic radome body

[0044] Weigh 2000g of silicon nitride powder with an average particle size of 1.0 μm, 150g of yttrium oxide and 150g of lanthanum oxide powder, add 300ml of deionized water, 50ml of 2% sucrose aqueous solution as a binder, 25g of polyammonium methacrylate Dispersant, add 2500g of balls, place in a planetary mill for ball milling for 4 hours, take out the slurry, and pour it into a gypsum cone mold after vacuum stirring and degassing. After the slurry is deposited for 20 minutes, pour off the excess slurry. The green body is taken out from the mold. After drying, the green body has a smooth surface, no cracking phenomenon, and the strength is sufficient for simple machining. The processed green body was sintered in an atmosphere furnace at a temperature of 1800°C and kept for 3 hours. After sintering, a silicon nitride ceramic radome with a size of φ150mm×200mm and a thickness of 6mm is obtained with good el...

Embodiment 2

[0045] Embodiment 2: the molding of alumina ceramic crucible

[0046] Weigh 2000g of alumina ceramic powder and 20g of basic magnesium carbonate as a sintering aid, add 280ml of deionized water, 60ml of 3% fructose aqueous solution, 30g of polyammonium methacrylate dispersant, and add 3000g of grinding balls at the same time, and place it in the drum In the type ball mill, take out the slurry after mixing for 22 hours, remove air bubbles under vacuum, add it to the plaster mold, pour off the excess slurry after 15 minutes at room temperature, and take out the green body. There is no cracking phenomenon after the crucible green body is dried. The dried alumina crucible body was placed in a sintering furnace for pressureless sintering at a sintering temperature of 1600°C and a holding time of 2 hours. A 150mm×150mm×100mm alumina crucible with a thickness of 3mm was obtained.

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Abstract

The invention belongs to the field of special ceramic material preparation processes and relates to an improved ceramic grouting and molding method. The method comprises the steps of proportioning; mixing and carrying out ball milling; removing air bubbles; pouring; settling slurry; discharging superfluous slurry; demolding and drying; and sintering. According to the method, a proper amount of organic sugar water solution is added in the slurry preparation process, organic sugar plays a role as a binding agent beneficial to improvement of strength of a blank obtained after slurry is settled, and the blank does not easily deform and crack in the drying and sintering processes, so that a non-deformable and defect-free ceramic part can be obtained. Only a small quantity of dispersing agent and sugar binding agent are added in the slurry preparation process, so that the content of organic matters in slurry is greatly reduced as comparison with the content of organic matters in slurry obtained by using the traditional grouting method; and due to the reduction of the organic matters, holes generated by discharging the organic matters in the sintering process of the ceramic part can be reduced, the ceramic density can be increased, and furthermore the strength of the ceramic can be improved.

Description

technical field [0001] The invention belongs to the field of preparation technology of special ceramic materials, and relates to the improvement of a ceramic grouting molding method. Background technique [0002] Grouting molding is to use the water absorption of the plaster mold to inject fluid slurry into the plaster mold, so that the slurry adheres to the model in a dispersed manner, forming a green body with the same shape as the model, and gradually grows with time. Thickening, when it reaches a certain thickness, it will be separated from the mold wall after drying and shrinkage, and then demoulded and taken out, and the green body will be made. Grouting molding is an ancient pottery and porcelain molding method, which is mostly used in daily ceramics, industrial art porcelain, sanitary ware porcelain, etc. The grouting method is considered to be only a backward ceramic forming technology, and the density of the green body is low, the structure of the green body is un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/63
Inventor 梁艳媛王岭焦健焦春荣张冰玉杨金华
Owner AVIC BASIC TECH RES INST
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