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A kind of nanocrystalline ceramic corundum abrasive and preparation method thereof

A technology of ceramic corundum and nanocrystals, applied in the field of ceramic corundum abrasives, can solve problems such as low grinding performance and uneven grain size

Active Publication Date: 2021-06-08
YICHUAN DONGFENG ABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a 2 o 3 A method for preparing nanocrystalline ceramic corundum abrasives from sol crystal seeds and the resulting abrasives, thereby solving the technical problems of uneven grain size and low grinding performance of ceramic corundum abrasives in the prior art

Method used

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  • A kind of nanocrystalline ceramic corundum abrasive and preparation method thereof
  • A kind of nanocrystalline ceramic corundum abrasive and preparation method thereof
  • A kind of nanocrystalline ceramic corundum abrasive and preparation method thereof

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Effect test

Embodiment 1

[0044] First prepare Al 2 o 3 Sol crystal seed, its preparation method is: take by weighing 42g analysis grade Al (NO 3 ) 3 9H 2 Dissolve O in deionized water, add dispersant PEG1000, and make Al 3+ A solution with a concentration of 2.0mol / L; then heat 560ml of an ammonia solution with a concentration of 1.5mol / L to 85~90°C, add the above solution dropwise to the ammonia solution, stir while adding, and control the pH value at 9~10 In between, aged for 2 hours, obtained the precipitate after suction filtration, made the precipitate into a suspension with deionized water; heated the obtained suspension to 80~95°C, and added dropwise to the suspension with a concentration of 1.5mol / L of nitric acid solution 28ml, make Al 3+ / H + The ratio is 1 / 40~1 / 3, add and stir to get Al 2 o 3 Sol seed.

[0045] Carry out the preparation of ceramic corundum abrasive secondly, the preparation method of ceramic corundum abrasive is: take by weighing 55g Al 2 (SO 4 ) 3 18H 2 O, 0....

Embodiment 2

[0048] First prepare Al 2 o 3 Sol crystal seed, its preparation method is: take by weighing 42g analysis grade Al (NO 3 ) 3 9H 2 Dissolve O in deionized water, add dispersant PEG1000, and make Al 3+ A solution with a concentration of 1.5mol / L; then heat 560ml of an ammonia solution with a concentration of 1mol / L to 85~90°C, add the above solution to the ammonia solution dropwise, stir while adding, and control the pH value between 9~10 After aging for 2 hours and suction filtration, the precipitate was obtained, and the precipitate was made into a suspension with deionized water; the resulting suspension was heated to 80~95°C, and the concentration of 1mol / L was added dropwise to the suspension. 28ml of nitric acid solution to make Al 3+ / H + The ratio is 1 / 40~1 / 3, add and stir to get Al 2 o 3 Sol seed.

[0049] Carry out the preparation of ceramic corundum abrasive secondly, the preparation method of ceramic corundum abrasive is: take by weighing 55g Al 2 (SO 4 ) ...

Embodiment 3

[0052] Weigh 55g Al 2 (SO 4 ) 3 18H 2 O, 0.55g PEG1000 dissolved in deionized water, dubbed Al 3+ A solution with a concentration of 0.70mol / L. Slowly add 1.0mol / L ammonia solution dropwise to the above solution, and add the ammonia solution in 4 times, and the amount of the first addition should ensure that the NH 4+ / Al 3+ =1.0~2.5, the addition amount of the remaining 3 times guarantees NH 4+ / Al 3+ =0.005~0.015, stirring while adding dropwise, keeping the pH value at 9.4, stirring for 3 hours, aging for 2 hours, to obtain a uniform and transparent gel, which was obtained by suction filtration and washing 3 times to obtain Al(OH) 3 Gel precursor. Add 5.5wt% (3.025g) liquid composite sintering aid to the above precursor, the composition and mass percentage of the added liquid composite sintering aid are: 34.5% Si(OC 2 h 5 ) 4 , 50.5% Mg(NO 3 ) 2 ·6H 2 O, 14.0% Ca(NO 3 ) 2 4H 2 O, 1.0% H 3 BO 3 , then add Al 2 o 3 Sol Seed, Al 2 o 3 The content of sol s...

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Abstract

The invention relates to nanocrystalline ceramic corundum abrasives and a preparation method thereof, belonging to the field of ceramic corundum abrasives. The abrasives are made of Al 2 (SO 4 ) 3 •18H 2 Composition of O and additives, additives include dispersant, liquid composite sintering aid and Al 2 o 3 Sol crystal seeds, the method for preparing ceramic corundum abrasives includes adding Al 2 (OH) 3 Gel precursor added liquid composite sintering aid and Al 2 o 3 The sol crystal seeds are uniformly ball-milled and then dried step by step to obtain dry gel. The dry gel is crushed, granulated, and sieved to obtain gel particles that meet the particle size requirements. The gel particles are calcined in sections and then cooled in the furnace , Vitrified corundum abrasive particles of different particle sizes are obtained by sieving. Also published Al 2 o 3 The preparation method of the sol seed crystal and the prepared ceramic corundum abrasive. By introducing Al 2 o 3 Sol crystal seeds overcome the difficulty of introducing solid nano crystal seeds and uneven mixing, and ensure the uniform mixing of raw materials and additives, so that the prepared ceramic abrasive has a microscopic morphology with fine and uniform grain size, which improves its compressive strength and grinding performance. performance.

Description

technical field [0001] The invention relates to the field of ceramic corundum abrasives, in particular to a nanocrystalline ceramic corundum abrasive, in particular to a nanocrystalline ceramic corundum abrasive and a preparation method thereof. Background technique [0002] Corundum (α-Al 2 o 3 ) Abrasives are used to make grinding materials because of their high melting point, high hardness, and difficulty in crushing. Ceramic corundum abrasives, as a new type of corundum abrasives, have good mechanical properties due to their small grain size and high degree of densification. , high grinding efficiency, long service life and many other advantages, and is widely used. Most of the preparation methods of ceramic corundum abrasives use the sol-gel method. The sol-gel method is through the alcoholysis or hydrolysis reaction of the solute and the solvent, and the product molecules generate nanoscale crystal nuclei particles and form a sol. The sol is formed under certain cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/624C09K3/14
CPCC04B35/10C04B35/624C04B2235/3206C04B2235/3208C04B2235/3409C04B2235/6562C04B2235/661C09K3/1454
Inventor 李海涛樊利存石铁拴赵钢强石小磊王广欣闫焉服李武会王维贾江议
Owner YICHUAN DONGFENG ABRASIVES
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