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Corundum cooling medium, related preparation method thereof and application thereof

A technology of cooling medium and corundum, applied in the field of corundum toughening and abrasive toughening, can solve the problems of unsuitable for small and medium-scale manufacturers, complex exhalation furnace equipment, limited size roll wall, etc., to achieve no safety hazard, suitable for large-scale Promotion and application, the effect of reasonable cost

Inactive Publication Date: 2012-10-24
王胜国 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel roll cooling method uses cold water to cool the hollow steel roll. The size of the roll is limited and the roll wall is very thin for the cooling effect. In this way, if a large amount of corundum melt of about 2000 degrees is poured in a pouring furnace, there is no time to dissipate heat, and the roll wall will be melted. , the corundum solution directly contacts with water to generate a large amount of water vapor and cause a big explosion. Therefore, the steel roll cooling method can only be cooled by slow discharge furnace. The equipment of the discharge furnace is complicated and the investment is large, which is not suitable for small and medium-sized manufacturers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Melt 60 kg of alumina and 40 kg of zirconia in a single-phase DC electric arc furnace with a voltage of about 70 volts and a current of about 1500 amperes. After being completely melted and poured into silicon carbide balls at around 1950 degrees, the obtained zirconium corundum crystals have a size of about 13 microns and a grain boundary thickness of less than 300 nanometers. However, about 60% of the silicon carbide balls have been broken and cannot be used again, and the production cost is high.

Embodiment 2

[0020] Melt 60 kg of alumina and 40 kg of zirconia in an electric arc furnace with a voltage of about 70 volts and a current of about 1500 amperes. After being completely melted, it is poured into carbon fiber reinforced silicon carbide balls at about 2000 degrees. The obtained zirconium corundum crystals are about 12 microns in size and the grain boundary thickness is less than 300 nanometers. All carbon fiber reinforced silicon carbide balls have no cracks and can be reused more than 30 times.

Embodiment 3

[0022] Melt 100 kg of alumina, appropriate amount of magnesia, silicon oxide and titanium oxide (less than 3 kg in total) in an electric arc furnace with a voltage of about 70 volts and a current of about 1500 amperes. After it is completely melted, it is poured into graphite fiber-reinforced silicon carbide plates at about 2200 degrees. The resulting corundum has a size of about 80 microns. All graphite fiber-reinforced silicon carbide plates have no cracks and can be reused more than 30 times.

[0023] The cooling effect of the steel ball cooling method is average, and the crystal size is large, mainly because the thermal conductivity of carbon steel is small, generally 48 W / mK The thermal conductivity is low. If a cooling material with a large thermal conductivity is selected, the corundum melt can be rapidly cooled to prevent crystal growth, thereby improving the toughness of the corundum abrasive. It can be seen from the thermal conductivity table of materials that diamon...

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Abstract

The invention relates to a corundum cooling medium which is a silicon carbide ball, carbon fiber-enhanced silicon carbide ball or graphite fiber-enhanced silicon carbide plate. The invention further provides a preparation method of the carbon fiber-enhanced silicon carbide ball or the graphite fiber-enhanced silicon carbide plate, an application of the silicon carbide ball, the carbon fiber-enhanced silicon carbide ball or the graphite fiber-enhanced silicon carbide plate used as the corundum cooling medium in the cooling of the corundum, a corundum quick cooling method, an obtained corundum abrasive material, and a mould made by the corundum abrasive material. According to the corundum cooling medium, the method and the application, the corundum is cooled by the corundum cooling medium, the cooling is quick, no potential safety hazard exists, the investment is little, and the cost is reasonable, an obtained corundum product is small in crystal size, and the product cost of the obtained corundum product can not be obviously increased, so that the corundum cooling medium, the method and the application are suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of abrasive toughening, in particular to the technical field of corundum toughening, and specifically refers to a corundum cooling medium, a related preparation method and application. Background technique [0002] The toughness of corundum has a very important influence on the grinding performance of abrasives. In addition to the chemical composition, the current abrasive toughening method also has a rapid cooling method to reduce the crystal size. The current popular rapid cooling methods for corundum include steel ball cooling method and There are 2 kinds of steel roll cooling methods. [0003] The steel selected by the steel ball cooling method is generally carbon steel, which has a small thermal conductivity and a slow cooling rate, so the cooling effect is average. The crystal size of corundum is relatively large. For example, domestic zirconium corundum AZ-25 and AZ-40 are both around 30 microns , Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/10C09K5/14C09K3/14
Inventor 王胜国牛耀武
Owner 王胜国
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