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Preparation method of multiphase ceramic powder

A technology for composite ceramics and powders, which is applied in the field of preparation of composite ceramic powders with adjustable resistivity, can solve problems not involved in the preparation of ceramic powders, achieve improved reliability and performance uniformity, low cost, and stable performance with uniform effect

Active Publication Date: 2013-07-10
宁波沃甘电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of these patents involves ceramic powder preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Mix silicon carbide, titanium boride, molybdenum disilicide and alumina in a weight ratio of 60:10:15:15, add dispersant and binder and grind in the water phase system to obtain a wet material; The dispersant adopts polyethyleneimine, and the binder adopts polyvinyl alcohol, and the dispersant accounts for 5.0% by weight of the water phase grinding system, and the weight percentage of the binder accounts for the water phase grinding system is 5%; raw material powder accounts for 60% by weight of the aqueous phase grinding system;

[0020] (2) The wet material obtained in step (1) is spray-dried and granulated to prepare multi-phase ceramic powder. During the process of spray-drying and granulating, the inlet temperature is controlled at 180°C, and the outlet temperature is controlled at 80°C; spray-drying and granulating The diameter of the post-granulation ball is controlled at 100-150 microns, and the water content is 3.0-5.0%.

Embodiment 2

[0022] (1) Mix boron carbide, titanium boride, iron silicide and boron oxide in a weight ratio of 80:5:10:5, add a dispersant and a binder, and grind in an aqueous phase system to obtain a wet material; The dispersant adopts tetramethyl ammonium hydroxide, the binder adopts polyvinyl butyral ester, the dispersant accounts for 5.0% by weight of the aqueous phase grinding system, and the binder accounts for 5.0% of the aqueous phase grinding system. The weight percentage is 5%; the weight percentage of the raw material powder in the aqueous phase grinding system is 40%;

[0023] (2) The wet material obtained in step (1) is spray-dried and granulated to prepare multi-phase ceramic powder. During the process of spray-drying and granulating, the inlet temperature is controlled at 200°C, and the outlet temperature is controlled at 100°C; spray-drying and granulating The diameter of the post-granulation ball is controlled at 100-150 microns, and the water content is 4.0-5.0%.

Embodiment 3

[0025] (1) Mix silicon carbide, titanium boride, molybdenum disilicide and alumina in a weight ratio of 60:10:15:15, add dispersant and binder and grind in the water phase system to obtain a wet material; The dispersant adopts polyethyleneimine, and the binder adopts polyvinyl alcohol, and the dispersant accounts for 8.0% by weight of the water phase grinding system, and the weight percentage of the binder accounts for the water phase grinding system is 3.0%; raw material powder accounts for 50% by weight of the aqueous phase grinding system;

[0026] (2) The wet material obtained in step (1) is spray-dried and granulated to prepare multi-phase ceramic powder. During the process of spray-drying and granulating, the inlet temperature is controlled at 220°C, and the outlet temperature is controlled at 100°C; spray-drying and granulating The diameter of the post-granulation ball is controlled at 130-180 microns, and the water content is 3.0-5.0%.

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Abstract

The invention relates to a preparation method of a multiphase ceramic powder, comprising the following steps of: (1) mixing carbide, boride, silicide and a metal oxide as raw material powders, adding a dispersant and a binder and grinding in an aqueous system to obtain a wet material; (2) carrying out spray-drying and granulation on the wet material obtained from the step (1) to obtain the multiphase ceramic powder. With the introduction of the dispersant, the binder and an antifoaming agent and with the combination of the stirring, grinding, mixing, spray-drying and granulation technologies,multi-phases are uniformly dispersed, thus greatly raising material reliability and performance uniformity. By the adoption of the advanced spray-drying and granulation technology, the powder is moresuitable for dry-pressing or continuous dry-pressing molding after spray-drying and granulation. The preparation method can be used to realize batch production and produce a heating-surface heating element with stable and uniform performance and adjustable resistivity, and has advantages of high production efficiency and low cost.

Description

technical field [0001] The invention relates to a powder preparation process of an inorganic solid material, which belongs to the preparation technology of multiphase ceramic powder with adjustable resistivity. Background technique [0002] In recent years, the electronic igniter manufacturing industry has developed rapidly in China. It involves various industries such as automobiles, various boilers, various fuel heaters, and weapon nodding systems, but most of them currently use electronic ignition methods. Although the electronic ignition method responds quickly, can be miniaturized and has high reliability, but due to the high-frequency electronic interference generated during the electronic ignition process, it is harmful to the human body, and the combustion of the gas is not complete, and the emission of incomplete combustion gas will be used as well as some products. Piezoelectric ceramics containing lead will pollute the environment. At home and abroad, more and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/626
Inventor 秦明刘亚飞
Owner 宁波沃甘电子科技有限公司
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