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Aluminum oxide/iron oxide composite abrasive grain and method of producing the same

A technology of composite abrasive grains and iron oxide, applied in the direction of fibrous fillers, etc., to achieve the effects of improving microscopic conditions, reducing roughness, and high polishing rate

Inactive Publication Date: 2011-08-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to overcome the defects of the single abrasive in the prior art and provide a composite abrasive grain of aluminum oxide / iron oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: In 2000 ml of deionized water, add α-Al 2 o 3 , formulated as a 5wt% aqueous solution; commercially available α-Al 2 o 3 The average particle size is 0.3μm; then add 4g of dispersant sodium hexametaphosphate, stir evenly with a mixer, then carry out ultrasonic dispersion, and then carry out ball mill dispersion to obtain α-Al 2 o 3 Dispersion 2000 ml.

[0017] The above α-Al 2 o 3 Add 10 grams of ferric nitrate to the dispersion liquid, heat to 100°C, add 30 g of 10% urea solution dropwise, and finish dropping in 30 minutes. Aging for 2 hours, centrifugal separation, purification, drying, and calcination at 600° C. for 2 hours, finally the alumina / iron oxide composite abrasive grains coated with 2 wt % iron oxide were obtained.

Embodiment 2

[0018] Example 2: In 2000 ml of deionized water, add α-Al 2 o 3 , formulated as a 5wt% aqueous solution; commercially available α-Al 2 o 3 The average particle size is 0.3μm; then add 4g of dispersant sodium hexametaphosphate, stir evenly with a mixer, then carry out ultrasonic dispersion, and then carry out ball mill dispersion to obtain α-Al 2 o 3 Dispersion 2000 ml.

[0019] The above α-Al 2 o 3 Add 50 grams of ferric nitrate to the dispersion, heat to 100° C., add 150 g of 10% urea solution dropwise, and finish dropping in 150 minutes. Aging for 2 hours, centrifugal separation, purification, drying, and calcination at 600° C. for 2 hours, finally the alumina / iron oxide composite abrasive grains coated with 10 wt % iron oxide were obtained.

Embodiment 3

[0021] The steps of this embodiment are basically the same as those of the above-mentioned embodiment 1, the difference is: in 2000 milliliters of α-Al 2 o 3 Add ferric nitrate to the dispersion liquid to be 100 grams, 10% urea solution to be 300 g, drip in 300 minutes. Finally, aluminum oxide / iron oxide composite abrasive grains coated with 20 wt% iron oxide were obtained.

[0022] As measured by a laser particle size analyzer, the particle size range of the above-prepared aluminum oxide / iron oxide composite abrasive grains is 100-1000 nm, and the average particle size is 200-700 nm.

[0023] The application test of the aluminum oxide / silicon oxide composite abrasive that the present embodiment makes now is described below:

[0024] (1) First prepare the polishing liquid: under mechanical stirring conditions, add 500 grams of alumina / iron oxide composite abrasive grains to 20 liters of water for dispersion and dilution, then add 150 grams of polyamine dispersant, and stir w...

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PUM

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Abstract

The present invention relates to an alumina / ferric oxide composite wear particle and a preparation method thereof. The inner core of the composite wear particle is Alpha-Al2O3 and a coating layer is ferric oxide, wherein, the mass of the ferric oxide is 2 percent to 40 percent of the content of Alpha-Al2O3. The inner core of the alumina / ferric oxide composite wear particle is Alpha-Al2O3 and the coating layer of the outer shell is ferric oxide; because the hardness of the outer shell is quite low, the 'hard impact' of the inorganic Alpha-Al2O3 wear particle to work pieces in a polishing micro area under pressurized and accelerated polishing conditions is reduced, so as to improve polishing scratches and surface damages as well as micro situations of the surface after polishing, and reduce the roughness. In addition, because of the quite strong chemical action of the ferric oxide, the composite wear particle has quite high polishing speed at the same time.

Description

technical field [0001] The invention relates to an aluminum oxide / iron oxide composite abrasive grain and a preparation method thereof, belonging to the technical field of preparation technology of abrasive materials for high-precision polishing. Background technique [0002] In recent years, with the rapid increase of memory hard disk capacity and storage density, the flying height of the computer head has been reduced to about 10nm. With the head running so close to the disk, the demands on the surface quality of the disk are getting higher and higher. If the surface roughness and waviness of the hard disk are too large, the head will collide with the surface of the disk during high-speed rotation, which will damage the head or the magnetic medium on the surface of the hard disk, resulting in failure of the disk device or failure of reading and writing information. mistake. Therefore, before forming a magnetic medium, the disk substrate must be polished to minimize the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/68
Inventor 雷红严琼林刘平布乃敬
Owner SHANGHAI UNIV
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