Feed for injection molding of zirconium oxide ceramic and preparation method thereof

Abstract

The invention discloses a feed for injection molding of a zirconium oxide ceramic and a preparation method thereof. The feed is prepared from yttrium-stabilized zirconium oxide powder and an organic mixture, wherein the yttrium-stabilized zirconium oxide powder accounts for 75 wt%-92 wt%, and the organic mixture accounts for 8 wt%-25 wt%. According to the invention, an organic zirconium precursoris creatively introduced, so the zirconium oxide ceramic feed is optimized; the organic zirconium precursor has good flowability and brings about 30 wt% of zirconium oxide yield after sintering; and thus, the problems of high organic matter content and considerable sintering defects of traditional zirconium oxide ceramic feeds are solved, and the zirconium oxide ceramic feed with high solid content and good flowability is obtained.

Description

technical field [0001] The invention relates to the field of precision ceramic preparation, in particular to a feed material for injection molding of zirconia ceramics and a preparation method thereof. Background technique [0002] Zirconia ceramics is a new type of high-tech ceramics. In addition to the high strength, hardness, high temperature resistance, acid and alkali corrosion resistance and high chemical stability of precision ceramics, it also has higher toughness than ordinary ceramics, making it Zirconia ceramics are widely used in various industries, such as shaft seal bearings, cutting components, molds, auto parts, etc., and can even be used in artificial joints. Especially in recent years, with the development of communication technology, 5G communication will be commercialized in 2020. The interference from metal is very severe. 3D zirconia ceramic mobile phone backplane has no signal shielding, high hardness, strong appearance and close to metal materials. F...

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Problems solved by technology

[0003] However, the low production pass rate and poor controllability of dimensional accuracy of zirconia ceramic structural parts greatly limit its large-scale application, especially the complex shape of zirconia ceramic structural parts is more difficult to mass-produce, and the precision required is higher than that of ceramics. It is difficult to effectively control the production process. The dimensional accuracy of structural parts can only be achieved by machining. Due to the high hardness and brittleness of zirconia ceramics, complex structures such as thin-walled and curved surfaces are extremely difficult to process, resulting in high costs and serious productivity. restricted

In the industry, the qualified rate of zirconia ceramic structural parts with complex shapes is less than 20%, mainly due to the poor controllability of ceramic molding and sintering processes

[0004] The dimensional accuracy of the complex shape zirconia ceramic structural parts blanks formed by the dry pressing and isostatic pressing processes commonly used at present is very poor, and a large size margin needs to be reserved for machining; the existing injection molding process is also difficult to mass produce zirconia For zirconium ceramic structural parts, the main reason is that the zirconia feed material has a high content of organic matter, and it is difficult to completely remove the organic matter during the firing process, resulting in many pore defects and low density of the injection molded zirconia ceramic structural parts, and the product performance cannot meet the requirements; while the sintered size The shrinkage and consistency of ceramic structural parts caused by large shrinkage are uncontrollable, which is a difficulty that the existing zirconia ceramic system cannot overcome

This is a problem brought about by the "womb" of the zirconia ceramic system. The sintering shrinkage of the existing zirconia ceramic system is as high as 20%, and the dimensional change temperature range is very narrow. Only in the sintering temperature range of 10-20 degrees, the zirconia ceramic structure Obviously, the fluctuation of the sintering temperature has a great impact on its size shrinkage and deformation, which also directly restricts the industrialization process of zirconia ceramic structural parts.

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