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Zinc oxide powder for preparing zinc oxide sintered body with high strength and low thermal conductivity

A technology of zinc oxide powder and density, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of not getting sintered body, the grain growth becomes larger, the seed crystal is large, etc., and achieves uniform structure and inhibits grain growth. Effect

Active Publication Date: 2019-07-19
KAWATETABU MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the seed crystal becomes larger, and the grain growth becomes significantly larger, so that a uniform sintered body cannot be obtained.

Method used

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  • Zinc oxide powder for preparing zinc oxide sintered body with high strength and low thermal conductivity
  • Zinc oxide powder for preparing zinc oxide sintered body with high strength and low thermal conductivity
  • Zinc oxide powder for preparing zinc oxide sintered body with high strength and low thermal conductivity

Examples

Experimental program
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Effect test

Embodiment

[0054] Hereinafter, the process of synthesizing basic zinc carbonate which is the precursor of zinc oxide powder of the present invention, the process of heat-treating the precursor to produce zinc oxide powder, the process of producing zinc oxide powder from zinc oxide powder, and the sintered zinc oxide The method and evaluation thereof are described, but the present invention is not limited to these specific examples.

[0055]

Synthetic example 1

[0057] As a zinc source, zinc nitrate hexahydrate (manufactured by Kishida Chemical Co., Ltd.), ammonium carbonate (manufactured by Kishida Chemical Co., Ltd.) as a carbonic acid source, and 30 wt% sodium hydroxide (manufactured by Kishida Chemical Co., Ltd.) as an alkali were used. Regarding each aqueous solution using pure water, 1 L of 0.5 M aqueous solution was prepared for zinc nitrate, and 0.5 L of 0.4 M aqueous solution was prepared for ammonium carbonate in a 2 L beaker. A pH electrode for pH control was placed in the aqueous ammonium carbonate solution, and the aqueous zinc nitrate solution was dropped at a rate of 1 L / h. In order to prevent the pH of the ammonium carbonate aqueous solution from falling due to the dropping of the acidic zinc nitrate aqueous solution, the on / off control of the pH controller (TDP-51, Toyo Chemical Research Laboratory) was used to drop the ammonium carbonate aqueous solution. By adding 30% by weight of sodium hydroxide, the pH of the aque...

Synthetic example 2

[0064] It is the same as the production example of precursor synthesis example 1, except that the carbonic acid source is changed to sodium bicarbonate to synthesize the precursor hydrozincite.

[0065] (Precursor Synthesis Example 3)

[0066] The synthesis was performed under the same conditions as the precursor synthesis example 1 except that the pH during synthesis was 6.0 and 8.5. The precipitates are all basic carbonates with hydrozincite as the main constituent, but at pH 6.0, the amount of precipitates obtained is small. According to the analysis of the solution, the yield rate is about 20%, which is obviously low in economy . At pH 8.5, the same results as in Examples were obtained with a yield of 100%.

[0067] (Precursor Synthesis Example 4)

[0068] The synthesis was performed in accordance with Patent Document 1 and Non-Patent Document 1. The zinc source was changed from zinc chloride to zinc nitrate, and the carbonic acid source was still sodium bicarbonate. For the pr...

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Abstract

This zinc oxide powder has a crystallite size of 20 to 50 nm as determined by X-ray diffraction, a particle diameter of 15 to 60 nm as determined by the BET method, a loose bulk density of 0.38 to 0.50 g / cm<3>, and a tapped density of 0.50 to 1.00 g / cm<3>. The zinc oxide powder has a small number of bound particles and a high tap density, and is useful as a raw material for obtaining a zinc oxidesintered body exhibiting high strength and low thermal conduction.

Description

Technical field [0001] The present invention relates to the provision of a zinc oxide material as a raw material for obtaining a zinc oxide sintered body with high strength and low thermal conductivity. Background technique [0002] Generally, parts made of ceramics are obtained by molding and sintering powder. Regarding the technology for molding powder and giving it a shape, various granulation methods and many technologies for obtaining a dense near-net shape, such as pressure molding, CIP molding, and belt molding, have been proposed and put into practical use. However, in order to achieve high-strength and low thermal conductivity ceramics, it is necessary to have dense and large grain boundaries, that is, uniform and small grain growth. Since ceramic sintering (including calcination) is completed by densification based on grain growth, it is difficult To achieve this, it is desired that the sintering powder be densified while suppressing the growth of crystal grains while ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02C04B35/453
CPCC01G9/02C04B35/453C01P2002/72C01P2006/10C01P2006/12C01P2004/03C01P2002/70C01P2002/60C01P2004/64C01P2006/11
Inventor 宇田川悦郎越前谷木绵子中田圭美
Owner KAWATETABU MINING