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

A zirconia ceramic and injection molding technology, applied in the field of precision ceramic preparation, can solve the problems of poor sintering process controllability, high hardness of zirconia ceramics, and high organic content, so as to solve the hidden dangers of environmental protection and safety, good flow performance, and expand application fields Effect

Active Publication Date: 2019-12-06
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Batching by mass percentage, get 85wt% ZrO(OH) 2 Precursors, 10wt% polyvinylpyrrolidone PVP and 5wt% stearic acid are added to the mixer at 180°C to melt and stir, and after fully mixing, cool down and set aside to obtain an organic mixture. The following steps are used to prepare a low-distortion, High precision zirconia ceramic material:

[0038] (1) Put 3mol yttrium-stabilized zirconia powder into a 200KG horizontal ceramic ball mill for ball milling for 16 hours, and spray granulation after ball milling;

[0039] (2) Put the yttrium-stabilized zirconia powder after spray granulation into a mixer, add an organic mixture with a powder mass fraction of 12 wt%, and uniformly mix at a temperature of 180° C.;

[0040] (3) After the mixed raw materials are granulated into a ceramic feed with a diameter of 3 mm and a height of 5 mm in a granulator, the feed is sent into the hopper of a high-pressure injection molding machine through an automatic feeder, and the injection p...

Embodiment 2

[0046] Batching by mass percentage, get 82wt% ZrO(OH) 2 Precursor, 8wt% high-density polyethylene HDPE, 5wt% polypropylene PP and 5wt% stearic acid are added to the mixer at 180°C to melt and stir, and after fully mixing, cool and set aside to obtain an organic mixture. The low deformation and high precision zirconia ceramic material is prepared through the following steps:

[0047] (1) After 2mol yttrium-stabilized zirconia powder (2YSZ) is batched, put into a 200KG horizontal ceramic ball mill for ball milling for 16 hours, and spray granulate after ball milling;

[0048] (2) Put the zirconia powder after spray granulation into the kneader, add an organic mixture with a powder mass fraction of 12%~, and knead evenly at a temperature of 180°C;

[0049] (3) After the mixed raw materials are granulated into a ceramic feed with a diameter of 3 mm and a height of 5 mm in a granulator, the feed is sent into the hopper of a high-pressure injection molding machine through an automa...

Embodiment 3

[0055] The same features of this embodiment as those of Embodiment 1 or Embodiment 2 will not be repeated here. The difference between this embodiment and the above-mentioned embodiment is that the ingredients are formulated according to mass percentage, and 75wt% of ZrO(OH) is taken. 2 Precursor, at least one of 20wt% high-density polyethylene HDPE, ethylene-vinyl acetate copolymer EVA, polyvinylpyrrolidone PVP, polyvinyl butyral PVB, random polypropylene APP, polypropylene PP, and At least one of 5 wt% of stearic acid SA, oleic acid OA, and carboxystearic acid HSA is added into a mixer and melted at 160°C.

[0056] The ball milling time in (1) was 5 hours, and the kneading temperature was 130°C.

[0057] (2) Add an organic compound with a powder mass fraction of 12 wt%, and knead evenly at a temperature of 130°C.

[0058] (3) The injection pressure is 20MPa, and the injection temperature is 125°C.

[0059] (4) The ceramic blank in the middle is subjected to degreasing trea...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/626C04B35/638
CPCC04B35/48C04B35/622C04B35/6263C04B35/6325C04B35/638C04B2235/6562C04B2235/6567C04B2235/6022
Inventor 赵小玻高勇王玉宝崔凯魏华阳徐先豹鲍晓芸张永翠
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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