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Method for preparing corundum abrasive by microwave sintering

A microwave sintering and abrasive technology, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of low grinding efficiency of corundum abrasives and high energy consumption of corundum abrasives, shorten the firing time, improve firing quality, reduce The effect of production energy consumption

Inactive Publication Date: 2017-12-08
河南建筑材料研究设计院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main chemical composition of corundum abrasive is α-Al 2 o 3 , α-Al 2 o 3 The bonding strength of positive and negative ions is very strong, which is the most stable phase in all aluminas. It not only has excellent mechanical properties, but also has a high melting point (up to 2050°C) in terms of macroscopic characteristics. It uses the electrofusion method to produce corundum abrasives. The melting temperature of the corundum abrasive is as high as 2200°C. Therefore, the energy consumption of the corundum abrasive produced by this method is relatively high; the primary crystal of the corundum abrasive obtained by the electrofusion method is relatively large due to the melting process, and the abrasive grains in the grinding process are as large as Intergranular fracture is the main form of damage, so the grinding efficiency of corundum abrasives produced by this method is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] With water as the ball milling medium, by total weight, the weight percentage is Al 2 o 3 95%, SiO 2 2.5%, MgO 1%, TiO 2 0.5%, MnO 2 0.5% and CuO 0.5% were mixed by ball milling, the ball milling speed was 400r / min, and the ball milling time was 8h. The ball-milled mixture was dried at 110°C for 10 hours, and 1 drop / g of PVA binder with a mass concentration of 4% was added to the dried mixture for granulation, and then shaped on a tablet machine. The pressure is 80MPa, and the holding time is 5min. Crushing, sieving and grading the pressed green body, taking green body particles between 100 and 120 mesh and putting them in a high-temperature furnace at 500°C for 30 minutes for debinding, and placing the degummed green body particles on the inner wall with α -Al 2 o 3 Put the coated SiC crucible into the mullite insulation cover, then put it into the microwave sintering furnace, heat up at 20°C / min, raise the temperature to 1100°C, then heat up at 15°C / min, an...

Embodiment 2

[0024] With water as the ball milling medium, by total weight, the weight percentage is Al 2 o 3 96%, SiO 2 2%, MgO1%, TiO 2 0.4%, MnO 2 0.4%, CuO0.2% were mixed by ball milling, the ball milling speed was 400r / min, and the ball milling time was 8h. The ball-milled mixture was dried at 110°C for 10 hours, and 1 drop / g of PVA binder with a mass concentration of 4% was added to the dried mixture for granulation, and then shaped on a tablet machine. The pressure is 60MPa, and the holding time is 10min. Crushing, sieving and grading the pressed green body, taking green body particles between 80 and 100 mesh and putting them in a high-temperature furnace at 600°C for 30 minutes for debinding, and placing the degummed green body particles on the inner wall with α -Al 2 o 3 Put the coated SiC crucible into the mullite insulation cover, then put it into the microwave sintering furnace, heat up at 20°C / min, raise the temperature to 1100°C, then heat up at 15°C / min, and heat up t...

Embodiment 3

[0026] With water as the ball milling medium, by total weight, the weight percentage is Al 2 o 3 98%, SiO 2 1%, MgO 0.5%, TiO 2 0.2%, MnO 2 0.2%, CuO 0.1% were mixed by ball milling, the ball milling speed was 400r / min, and the ball milling time was 8h. The ball-milled mixture was dried at 110°C for 10 hours, and 1 drop / g of PVA binder with a mass concentration of 4% was added to the dried mixture for granulation, and then shaped on a tablet machine. The pressure is 120MPa, and the holding time is 3min. Crushing, sieving and grading the pressed green body, taking the green body particles between 40 and 60 mesh and putting them into a high-temperature furnace at 600°C for 30 minutes for debinding, and placing the degummed green body particles on the inner wall with α -Al 2 o 3Put the coated SiC crucible into the mullite insulation cover, then put it into the microwave sintering furnace, heat up at 15°C / min, raise the temperature to 1100°C, then heat up at 10°C / min, a...

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Abstract

The invention discloses a method for preparing corundum abrasive by microwave sintering, and belongs to the technical field of abrasive preparation. The corundum abrasive comprises the following raw materials in percentage by weight: 95-98% of Al2O3, 0.5-2.5% of SiO2, 0.5-1% of MgO, 0.2-1% of TiO2, 0.2-1% of MnO2, and 0.1-1% of CuO. The method comprises the following steps: mixing the raw materials; molding; crushing; sieving; grading; performing rubber removing; transferring the rubber-removed blank particles into an SiC crucible; increasing the temperature to reach 1300-1500 DEG C at the rate of 10-20 DEG C per minute; then maintaining the temperature for 5-30min, and performing microwave sintering to obtain the corundum abrasive. With the adoption of the method, energy consumption of the corundum abrasive production can be greatly decreased; in addition, the blank particles are in contact with each other, so that the clearances among the particles are small, the temperature gradient of a sintered body can be reduced, the sintering time is greatly decreased, and as a result, the corundum abrasive sintering quality can be improved.

Description

technical field [0001] The invention relates to the technical field of abrasive preparation, in particular to a preparation method of corundum abrasive. Background technique [0002] Abrasives are materials used for grinding, grinding and polishing in mechanical processing. They are widely used in machinery, light industry, chemical industry, military industry, electronics, construction, transportation and other fields, and play a very important role in the development of modern industry. There are many kinds of abrasives, which are divided into natural abrasives and artificial abrasives according to their production methods. The performance of artificial abrasives can be regulated by controlling components and adding additives, so they have a wide range of applications. Artificial abrasives can be roughly divided into corundum abrasives, silicon carbide abrasives, diamond abrasives, cubic boron nitride abrasives, etc. Corundum abrasives are one of the major categories becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/64C09K3/14
CPCC04B35/10C04B35/622C04B35/64C04B2235/3206C04B2235/3232C04B2235/3267C04B2235/3281C04B2235/3418C04B2235/667C04B2235/96C09K3/1436
Inventor 杨子尹青亚边华英张梦真
Owner 河南建筑材料研究设计院有限责任公司
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