Preparation method of high-density zirconia ceramic material

Abstract

A preparation method of the high-compactness zirconia ceramic material comprises the following steps: carrying out high-temperature and high-pressure spray drying composite modification on zirconia powder by adopting stearic acid (SA) and polyethyleneimine (PEI) to prepare zirconia ceramic slurry; curing under the irradiation of ultraviolet light to obtain a ceramic green body, and then performing five-section degreasing treatment at 180-1000 DEG C under atmospheric pressure; performing high temperature treatment by increasing the temperature to 1000 DEG C under the vacuum degree of 10<-3> Pa for high-temperature treatment, and finally, nitrogen is adopted to adjust the pressure to 1000-3000 Pa, and segmented high-temperature sintering is carried out. The solid content of the prepared zirconium oxide slurry is 90-94%, the viscosity is 1.05-1.39 Pa.s under 30 / s; the prepared zirconium oxide ceramic material has no crack and layering defects, the shrinkage rate after degreasing and sintering is 14-18%, the sintering density reaches 98.9-99.7%, the ceramic uniformity is good, and no crack, layering or other defects exists.

Description

Technical field [0001] The present invention relates to the field of additive manufacturing techniques, and more particularly to a method of preparing highly dense zirconia ceramic materials. Background technique [0002] Zirconia ceramics are widely used in chemical, mechanical, electronics, aerospace and biomedical fields such as physical properties such as mechanical strength, high temperature resistance, corrosion resistance, chemical stability. The conventional ceramic preparation process is usually mixed with ceramic powder and binder or other additives, prepared by injection molding, stamping, casting, gel injection molding, etc., and then dry, high temperature degreasing and Process such as sintering causes dense. However, these conventional preparation methods require a pre-manufacturing mold, resulting in the entire preparation cycle, and unable to prepare a highly complex structure, especially a medium-porous ceramic material parts. With the advancement and development...

AI Technical Summary

Problems solved by technology

DLP-3D printing zirconia ceramic slurry contains more resin materials. Since ceramic slurry requires low viscosity, low viscosity reduces cracks and improves the uniformity of microstructure, but ensuring low viscosity will lead to solidification of the prepared slurry. Low content, when the resin material decomposes at high temperature, it will release a large amount of gas, internal chemical water, and some components will volatilize, and the sintering after high temperature degreasing makes the material have a large shrinkage rate and cause great deformation. These factors make the material It is easy to produce cracks, delamination, pores and other defects. These defects will be enlarged during the sintering process, which will reduce the sintering density of the material and affect the performance of the prepared ceramic material.

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