Slurry for ceramic screw and preparation method

A screw and ceramic technology, which is applied in the field of ceramic screw slurry and preparation, can solve the problems of ceramic screw with good wear resistance and safety, high dimensional accuracy requirements, and low product dimensional accuracy, so as to avoid product defects and disperse the effect Good, uniform product density

Inactive Publication Date: 2019-12-06
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Screws used in juicers are mainly made of plastic, metal, and ceramics. Plastic screws are easy to wear and have a short life; although metal screws have better wear resistance, they have hidden dangers such as corrosion or heavy metal dissolution when in contact with juice; Ceramic screw has good wear resistance and safety
[0003] The shape of the ceramic screw is relatively complex and requires high dimensional accuracy. The forming methods of ceramic structural parts, including dry pressing, isostatic pressing, grouting, hot die casting, etc., cannot meet the requirements. Dry pressing and isostatic pressing processes cannot form complex shapes. Ceramic products; grouting molding blanks are prone to density unevenness and composition segregation, and the product's dimensional accuracy is low; hot die casting molding is more suitable for the molding of small-sized ceramic parts, and large-sized products are prone to defects such as pores and cracks
At present, the production of ceramic screws mainly adopts the injection molding process, which can form products with complex shapes. The product has high dimensional accuracy and can realize near-net size molding. Many, debinding treatment is required before sintering, the production cycle is long, it is easy to cause environmental pollution, and the debinding process may also cause cracking of the green body
Concrete injection molding uses water as a solvent and has less environmental pollution. This technology makes the ceramic powder shape through the in-situ polymerization of monomers and crosslinking agents. It is suitable for the precision molding of ceramic green bodies, but this process is used to prepare ceramics with complex shapes. When producing products, the efficiency is low, and the gas at the corners is not easy to discharge when the slurry is poured into the mold, which may easily cause product defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: 96 alumina ceramic screw

[0022] Weigh 1000g of 96 alumina ceramic powder, add 130g of deionized water, 9g of modified ammonium polyacrylate (acrylic acid and methacrylic acid copolymer ammonium salt solution) as a dispersant, 1.2g of tetramethylammonium hydroxide as a regulator, 25g Acrylamide monomer and 1.25g of N,N-methylenebisacrylamide crosslinking agent were mixed to obtain a water-based slurry, 1.5g of catalyst and 2.5g of initiator were added, and vacuum defoaming was performed. Put it into a closed container connected to compressed air, connect it to the grouting port on the mold through a hose with a valve, turn on the compressed air to slowly inject the slurry into the mold, after the slurry fills the mold, close the valve on the hose, and wait The slurry gel solidified. After curing, demould, dry and sinter to obtain 96 alumina ceramic screw.

[0023] Wherein, the initiator can be selected from ammonium persulfate, and the catalyst can be sele...

Embodiment 2

[0025] A ceramic screw slurry prepared from the following components by mass fraction, alumina ceramic powder, modified ammonium polyacrylate accounting for 0.6% of the ceramic powder, and tetramethylammonium hydroxide accounting for 0.2% of the ceramic powder, The water that accounts for 10% of the ceramic powder, acrylamide and N, N-methylenebisacrylamide are monomers and crosslinking agents, and the amount of the monomers is 3% of the ceramic powder. The amount of the crosslinking agent It is 1 / 20 of the monomer, the modified ammonium polyacrylate is an aqueous ammonium salt solution of acrylic acid and methacrylic acid copolymer, the mass fraction of alumina in the ceramic powder is 75%, and the mass fraction of the sintering aid is is 25%, and the sintering aid is selected from kaolin, calcium carbonate or talc.

[0026] Other technical features are the same as in Embodiment 1.

Embodiment 3

[0028] A ceramic screw slurry prepared from the following components by mass fraction, ceramic powder, modified ammonium polyacrylate accounting for 2.5% of the ceramic powder, tetramethylammonium hydroxide accounting for 0.1% of the ceramic powder, accounting for ceramic powder 15% of water in the powder, acrylamide and N, N-methylenebisacrylamide are monomers and crosslinking agents, the amount of the monomers is 2% of the ceramic powder, and the amount of the crosslinking agents is the 1 / 15 of the above monomers.

[0029] Preferably: the mass fraction of alumina in the ceramic powder is 96%, and the mass fraction of the sintering aid is 4%, and the sintering aid is selected from kaolin, calcium carbonate or talc.

[0030] Other technical features are the same as those in Embodiment 1 or Embodiment 2.

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PUM

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Abstract

The invention discloses slurry for a ceramic screw and a preparation method. The slurry is prepared from the following components in parts by mass: ceramic powder, modified ammonium polyacrylate accounting for 0.6 to 2.5% of the ceramic powder, tetramethylammonium hydroxide accounting for 0.1-0.2% of ceramic powder, water accounting for 10-15% of the ceramic powder, acrylamide used as a monomer, and N,N-methylene bisacrylamide used as a cross-linking agent, wherein the use amount of the monomer is 2-3% of the use amount of the ceramic powder, and the use amount of the cross-linking agent is 1/15-1/20 of the use amount of the monomer. The dispersing agent, the conditioning agent, the water and the like of the slurry are coordinated with ceramic powder, so synergistic promotion effect is obtained, the ball-milled slurry has low viscosity while having high solid content (50 vol% or above), and good fluidity, suspension properties and uniformity of the slurry are guaranteed, which are beneficial for grouting and uniform product density.

Description

technical field [0001] The invention relates to the field of preparation of ceramic screws, in particular to a slurry and a preparation method of ceramic screws. Background technique [0002] Screws used in juicers are mainly made of plastic, metal, and ceramics. Plastic screws are easy to wear and have a short life; although metal screws have better wear resistance, they have hidden dangers such as corrosion or heavy metal dissolution when in contact with juice; The wear resistance and safety of the ceramic screw are good. [0003] The shape of the ceramic screw is relatively complex and requires high dimensional accuracy. The forming methods of ceramic structural parts, including dry pressing, isostatic pressing, grouting, hot die casting, etc., cannot meet the requirements. Dry pressing and isostatic pressing processes cannot form complex shapes. Ceramic products; grouting molding blanks are prone to density unevenness and composition segregation, and the product's dimen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/632C04B35/634
CPCC04B35/10C04B35/622C04B35/632C04B35/63404
Inventor 鲍晓芸张永翠赵小玻王玉宝吕锋高勇徐先豹魏华阳
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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