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Preparation method of high-purity heat-conducting spherical aluminum oxide

A spherical alumina, high-purity alumina technology, used in aluminate/alumina/aluminum hydroxide purification, epoxy resin glue, non-polymer adhesive additives, etc., can solve physical structure and performance limitations, The surface of alumina is not smooth, which affects the thermal conductivity of the product, etc., to achieve the effect of adjustable powder particle size, small powder particle size and good sphericity

Active Publication Date: 2017-01-11
晶鑫晶体(内蒙古)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, the surface of alumina prepared by rolling into balls is not smooth and the particle size is uneven, and due to the limitation of alumina raw materials, its physical structure and performance are limited;
[0005] The production efficiency of the high-temperature melt injection method is low, and the cost of the ball is high. The spray gun will substitute impurities into the product under long-term high-temperature use, which will affect the purity of the product. In addition, acetylene and oxygen are used as fuel, and carbon will be generated during the combustion process, which will affect the heat conduction effect of the product.

Method used

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  • Preparation method of high-purity heat-conducting spherical aluminum oxide
  • Preparation method of high-purity heat-conducting spherical aluminum oxide
  • Preparation method of high-purity heat-conducting spherical aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) First put the carrier made of high-purity alumina on the conveyor belt, and align it with the discharge hole of the furnace, and start the cooling water under the conveyor belt;

[0036] 2) Put high-purity gamma alumina powder with particle size D50: 30 microns into the inner hopper;

[0037] 3) Connect the hydrogen-oxygen burner to the gas supply device and ignite it, adjust the hydrogen to 300SLM, the oxygen flow to 140SLM, and start heating up the kiln;

[0038] 4) When the temperature in the furnace rises to 1875°C, open the discharge port of the hopper, start the vibrating hammer above the hopper, and set the frequency of the vibrating hammer to 12HZ and the air intake of the loaded oxygen to 25SLM, so that the high-purity alumina powder Evenly and stably pass through the oxygen nozzle, enter the hydrogen-oxygen mixed combustion chamber, and carry out sintering, the feeding speed is 2000g / h;

[0039] 5) After the material is sintered by the hydrogen-oxygen flame ...

Embodiment 2

[0041] 1) First put the carrier made of high-purity alumina on the conveyor belt, align it with the discharge hole of the furnace, and start the cooling water under the conveyor belt;

[0042] 2) Put the high-purity gamma alumina powder with particle size D50: 28 microns into the inner hopper;

[0043] 3) Connect the hydrogen-oxygen burner to the gas supply device and ignite it, adjust the hydrogen gas to 296SLM, the oxygen flow rate to 140SLM, and start heating up the kiln;

[0044] 4) When the temperature in the furnace rises to 1865°C, open the discharge port of the hopper, start the vibrating hammer above the hopper, and set the frequency of the vibrating hammer to 11.5HZ and the air intake of the loaded oxygen to 25.6SLM, so that the high-purity Alumina powder passes through the oxygen nozzle evenly and stably, enters the hydrogen-oxygen mixed combustion chamber, and is sintered at a feeding rate of 1995g / h;

[0045] 5) After the material is sintered by the hydrogen-oxyg...

Embodiment 3

[0047] 1) First put the carrier made of high-purity alumina on the conveyor belt, align it with the discharge hole of the furnace, and start the cooling water under the conveyor belt;

[0048] 2) Put the high-purity gamma alumina powder with particle size D50: 32 microns into the inner hopper;

[0049] 3) Connect the hydrogen-oxygen burner to the gas supply device and ignite it, adjust the hydrogen gas to 304SLM at 14.6~15.4:7, and the oxygen flow rate to 140SLM, and start heating up the kiln;

[0050] 4) When the temperature in the furnace rises to 1880°C, open the discharge port of the hopper, start the vibrating hammer above the hopper, and set the frequency of the vibrating hammer to 12.5HZ and the air intake of the loaded oxygen to 24.6SLM, so that the high-purity Alumina powder passes through the oxygen nozzle evenly and stably, enters the hydrogen-oxygen mixed combustion chamber, and is sintered at a feeding rate of 2005g / h;

[0051] 5) After the material is sintered b...

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Abstract

The invention relates to a preparation method of high-purity heat-conducting spherical aluminum oxide. The method is characterized by comprising the following steps: high-purity gamma-aluminum oxide powder is added into a hopper; an oxyhydrogen combustor is connected with a gas feeder and is ignited, the volume flow rate of the hydrogen gas inlet to the oxygen gas inlet is regulated to (14.6-15.4):7, and heating of the furnace chamber of the furnace body is started; when the temperature in the furnace chamber rises to 1850-1890 DEG C, the volume flow rate of the material-carrying oxygen to the oxygen is (1.2-1.3):7, the aluminum oxide powder enters the combustion chamber of the oxyhydrogen combustor through an oxygen nozzle so as to be sintered; and the material is sintered through the oxyhydrogen flame of the nozzle, passes through the furnace chamber along with the gas flow, falls onto a high-purity aluminum oxide carrier of a conveyor belt, is cooled on the conveyor belt, and finally enters a storage bin. The technical process is simple, and is suitable for mass production. The technique is stable, and can ensure the product quality. The product has favorable particle size distribution and adjustable particle size. The product has the advantages of favorable sphericity, high purity and favorable heat-conducting property.

Description

technical field [0001] A method for preparing high-purity heat-conducting spherical alumina belongs to the technical field of high-purity alumina. Background technique [0002] Due to its excellent physical and chemical properties, high hardness, good wear resistance, heat resistance and corrosion resistance, alumina powder is widely used as ceramic materials, grinding materials, luminescent materials, adsorption materials and various chemical materials. Catalysts and catalyst supports for reactions. The spheroidization of alumina powder particles can improve the performance of the final product. For example, when spherical alumina is used as a heat-conducting additive, it has a higher thermal conductivity than alumina with irregular shapes, which can increase the service life. [0003] At present, the production methods of spherical alumina for heat conduction mainly include: flux sintering method, high temperature melt spraying method, etc. [0004] Among them, the surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/46C08K7/18C08K3/22C08L23/12C08L83/04C09J163/00C09J11/04C09D7/12
CPCC01F7/46C01P2004/32C01P2004/51C01P2004/61C01P2006/32C01P2006/80C08K3/22C08K7/18C08K2003/2227C08L2203/206C09J11/04C09J163/00C08L23/12C08L83/04
Inventor 王武平张棋宋军
Owner 晶鑫晶体(内蒙古)科技有限公司
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