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Sintering method of corundum crystals

A sintering method and crystal technology, applied in the field of corundum crystal, can solve the problems of large corundum crystal grain size, high energy consumption and high production cost, and achieve the effects of small cutting edge, low energy consumption and short sintering time

Active Publication Date: 2012-05-09
郑州嵩山硼业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high-temperature smelting process, the smelting temperature needs to be as high as 2000°C and the smelting cycle is about 20 hours, so the energy consumption is large and the production cost is high. At the same time, the corundum crystals obtained have a large particle size and need to be crushed to meet the needs of abrasive processing and other industries. needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the sintering method of corundum crystals according to the present invention, first select active alumina and water with a particle size of less than 10 microns and a purity greater than 60% and mix them into lumps or pastes according to the ratio of 1:0.3-2, then put them into a drying furnace, heat Dehydrate at 120°C for 3-4 hours, then put the dried molding material into a high-temperature furnace, raise the temperature to 1200-2050°C, sinter for 1-16 hours, and naturally cool to room temperature. The obtained block green body is broken into crystals Corundum crystals with a particle size of less than 10 microns. During sintering, as the sintering temperature increases and the sintering time prolongs, the crystal grain size will gradually increase and the strength will gradually become stronger. For example, when the sintering temperature is 1200-1600°C and the sintering time is 1-5 hours, the strength of the obtained corundum crystal is slightly lower. When used ...

Embodiment 2

[0014] The sintering method of corundum crystal according to the present invention firstly selects active alumina, water and auxiliary materials calcium oxide, magnesium oxide, silicon oxide, chromium oxide, titanium oxide with a particle size less than 10 microns and a purity greater than 60%. The ratio is: activated alumina: calcium oxide: magnesium oxide: silicon oxide: chromium oxide: titanium oxide: water=1:0.01-0.05:0.01-0.05:0.01-0.03:0.01-0.03:0.01-0.03:0.3-2 ;Mix the above-mentioned raw materials into a block or paste in a mixer, put them into a drying furnace, heat to 120°C for 3-4 hours, and then put the dried molding material into a high-temperature furnace, and heat up to 1200-2050°C , sintered for 1-16 hours, cooled naturally to room temperature, and the obtained block body was crushed into corundum crystals with a crystal size of less than 10 microns.

[0015] The addition of auxiliary materials such as calcium oxide, magnesium oxide, silicon oxide, chromium oxi...

Embodiment 3

[0018] If the raw materials in Example 1 or Example 2 are mixed, add a small amount of acetic acid and sulfuric acid (the two account for 0.1-0.5% of the activated alumina respectively), and the water solubility of the activated alumina will be better when mixed. The better the raw materials are mixed, the more uniform the crystal grain size in the sintered corundum compact and the better the effect.

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PUM

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Abstract

The invention discloses a sintering method of corundum crystals, comprising the following steps of: firstly, selecting activated aluminium oxide with the grain size being less than 10 microns and the purity being more than 60% and water, mixing the activated aluminium oxide and the water into a block or paste in the ratio of 1:(0.3 to 2) and then putting into a drying furnace; heating to 120 degrees centigrade and dehydrating for 3-4 hours; and then putting the dried molding materials into a high temperature furnace; and increasing the temperature to 1200-2050 degrees centigrade, sintering for 1-16 hours, naturally cooling to the room temperature, crushing the obtained blocky body to obtain the corundum crystals with the grain size being less than 10 microns. The sintering method disclosed by the invention has the advantages of greatly reducing the heating time and energy consumption by adopting the sintering method to replace the traditional melting method; the grain size of the sintered corundum crystals can be minimized to 1 nanometer; the corundum crystals presents an excellent self-sharpening performance when being used as the abrasive material; the service lives of the corundum crystals is more than ten times of that of the common abrasive material; and when fine grinding is performed, because the cryostalline of the corundum crystal is small, an emerging cutting edge is small, so that the efficiency is high and the polishing precision is improved.

Description

technical field [0001] The invention relates to corundum crystals, in particular to a sintering method for corundum crystals used as abrasives. Background technique [0002] The existing artificial corundum crystal is smelted with alumina as raw material at high temperature. The finished corundum has high hardness but low toughness, stable chemical properties and high insulation. The abrasive tools used for production can be used for high hardness and high strength materials such as alloys Grinding steel, high-carbon steel, high-speed steel and quenched steel, etc., can also be used as grinding and polishing materials, and can also be used as precision casting sand, spraying materials, chemical catalyst carriers, characteristic ceramics, advanced wear-resistant materials, etc. Due to the high-temperature smelting process, the smelting temperature needs to be as high as 2000°C and the smelting cycle is about 20 hours, so the energy consumption is large and the production cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/20C30B1/10C30B28/02
Inventor 王基峰
Owner 郑州嵩山硼业科技有限公司