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Superhard ceramic abrasive material preparation method

A technology of ceramics and abrasives, which is applied in the field of preparation of superhard ceramic abrasives, which can solve problems such as holes, cracks, uneven product composition, poor performance stability, etc., and achieve no holes, no chemical segregation, and good performance stability Effect

Inactive Publication Date: 2017-03-22
CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: for the preparation of ceramic abrasives by the sol-gel method, due to the uneven mixing of various components in the system, it is easy to cause chemical segregation, resulting in uneven composition of the sintered product, poor performance stability, and easy to produce The disadvantages of holes and cracks provide a method of crushing and sieving bentonite, mixing with deionized water for ball milling, stirring with sulfuric acid solution after drying, centrifuging to obtain a refined pickling solution, adding urea to prepare a mixed solution, and suction filtration to obtain a filter solution. The cake is washed, dried, and calcined to obtain alumina whiskers, mixed with pseudo-boehmite and triammonium citrate solution, and then added with alumina whiskers, sprayed, granulated, and calcined to obtain superhard ceramic abrasives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, weigh 200g of bentonite, put it into a pulverizer and pulverize it, pass through a 100-mesh sieve, soak the sieved bentonite powder in 100mL of deionized water, let it stand for 1 hour, put it into a ball mill, and ball mill it at 200r / min for 1 hour, then place In a drying oven, dry at 100°C to constant weight to obtain pretreated bentonite; then weigh 80g of the above pretreated bentonite, add 320mL of sulfuric acid solution with a mass fraction of 40%, in a constant temperature water bath at 90°C, at 300r / min After stirring for 3 hours, collect the filtrate by filtration, add aluminum hydroxide to the filtrate to adjust the pH of the filtrate to 2.5, then add 0.8 g of potassium permanganate, continue stirring for 15 minutes, leave it to cool to room temperature, and then centrifuge to collect the supernatant to obtain Refined pickling solution; then add 50g of urea and 15g of polyethylene glycol PEG-2000 to 100mL of the above-mentioned refined pickling solution...

example 2

[0018]First weigh 250g of bentonite, put it into a pulverizer and pulverize it, pass through a 100-mesh sieve, soak the sieved bentonite powder in 150mL of deionized water, let it stand for 2 hours, put it into a ball mill, and ball mill it at 250r / min for 2 hours, then place In a drying oven, dry at 105°C to constant weight to obtain pretreated bentonite; then weigh 90g of the above pretreated bentonite, add 360mL of sulfuric acid solution with a mass fraction of 40%, in a constant temperature water bath at 93°C, at 400r / min After stirring for 4 hours, collect the filtrate by filtration, add aluminum hydroxide to the filtrate to adjust the pH of the filtrate to 2.8, then add 0.9 g of potassium permanganate, continue to stir for 18 minutes, leave it to cool to room temperature, and then centrifuge to collect the supernatant to obtain Refined pickling solution; then add 65g of urea and 16g of polyethylene glycol PEG-2000 to 110mL of the above-mentioned refined pickling solution,...

example 3

[0020] First, weigh 300g of bentonite, put it into a pulverizer and pulverize it, pass through a 100-mesh sieve, soak the sieved bentonite powder in 200mL of deionized water, let it stand for 2 hours, put it into a ball mill, and ball mill it at 300r / min for 2 hours, then place In a drying oven, dry at 110°C to constant weight to obtain pretreated bentonite; then weigh 100g of the above pretreated bentonite, add 400mL of sulfuric acid solution with a mass fraction of 40%, in a constant temperature water bath at 95°C, at 500r / min After stirring for 4 hours, collect the filtrate by filtration, add aluminum hydroxide to the filtrate to adjust the pH of the filtrate to 3.0, then add 1.0 g of potassium permanganate, continue to stir for 20 minutes, leave it to cool to room temperature, and then centrifuge to collect the supernatant to obtain Refined pickling solution; then add 80g of urea and 16g of polyethylene glycol PEG-2000 to 120mL of the above-mentioned refined pickling soluti...

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Abstract

The invention discloses a superhard ceramic abrasive material preparation method and belongs to the technical field of ceramic abrasive material preparation. The preparation method comprises the steps of smashing and sieving bentonite; mixing and ball milling the bentonite with deionized water; drying the bentonite and stirring the bentonite with sulfuric acid solution; centrifuging to obtain refined pickle liquor; adding urea to obtain mixed liquor; performing suction filtration to obtain filter cake; washing, drying and roasting to obtain aluminum oxide crystal whisker; mixing pseudo-boehmite with ammonium citrate solution, then adding the aluminum oxide crystal whisker and performing spray granulation and roasting to obtain the superhard ceramic abrasive material. The preparation method is simple in preparation step, all the ingredients in the system can be evenly mixed through a bridge connection effect of the aluminum oxide crystal whisker, the chemical segregation phenomenon is avoided, and the obtained ceramic abrasive material is even in components, good in performance stability and free of holes and cracks.

Description

technical field [0001] The invention relates to a preparation method of superhard ceramic abrasive, which belongs to the technical field of ceramic abrasive preparation. Background technique [0002] Ceramic microcrystalline abrasive is a new product among alumina abrasives, which is prepared by sol-gel method. Ceramic microcrystalline abrasives are sintered abrasives with very small grain sizes. During grinding, the traditional fused corundum abrasive grains are flattened and passivated after being ground off on the working surface. Under the action of grinding force, the abrasive grains are easy to fall off from the abrasive tool, and the service life is short. The whole wear process of ceramic microcrystalline abrasives is also the self-sharpening process of the abrasive grains themselves; during use, when the tiny grains on the surface of the abrasive grains are blunted and fall off from the abrasive grains under the action of grinding force, they are constantly exposed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/624
CPCC04B35/803C04B35/10C04B35/624C04B2235/528C04B2235/96
Inventor 周丽花邹宇帆宋豪
Owner CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH
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