Slurry for ceramic screw and preparation method

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...

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