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Preparation method of microcrystalline corundum abrasive material

A technology of microcrystalline corundum and abrasives, which is applied in the field of preparation of microcrystalline corundum abrasives, can solve the problems of reduced product strength, poor quality controllability, and poor uniformity, and can meet the requirements of high hardness grinding, compact product structure, and grinding The effect of stable performance

Inactive Publication Date: 2015-11-11
贵州格勒尔高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Boehmite or pseudo-boehmite is usually used as the precursor, and the relative cost is relatively high; and the boehmite or pseudo-boehmite products currently on the market have large particle size, poor uniformity, and low purity (mostly contain sodium ions, calcium ions, etc.), it is easy to cause the sintered microcrystalline corundum grain size to be large, and the impurity content is high, which directly leads to low strength of the final product and poor quality controllability (grain size)
[0007] 2. The seeding process has significant limitations
The introduced crystal seed itself has the same lattice structure as α-alumina, but is completely different from the precursor of α-alumina (boehmite or pseudo-boehmite), so it is difficult to mix and dissolve in the process of peptization and mixing. It is easy to cause uneven distribution and increase the difficulty of large-scale production; and the activity of this type of seed crystal material itself is low, and it is easy to form defects during the sintering process of the final product, reducing the product strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of microcrystalline corundum abrasive

[0025] 1) Alumina monohydrate powder is added to a mixed solution of hydrochloric acid and water, the molar ratio of alumina monohydrate: hydrochloric acid: water is 1:8.5:50, and the suspension is obtained after stirring for 5h;

[0026] 2) Add manganese oxide to the suspension obtained in step 1), the molar ratio of aluminum oxide monohydrate to manganese oxide is 1:50, and stir for 4 hours to obtain a wet gel;

[0027] 3) Dry the wet gel obtained in step 2) at 50°C for 24 hours to obtain a dry gel;

[0028] 4) The dry gel obtained in step 3) is pulverized, and 30-70 mesh particles are selected, and the temperature is gradually increased and calcined at 400-800°C at a heating rate of 5°C / min to obtain γ-alumina;

[0029] 5) Calcining the γ-alumina obtained in step 4) at 1400° C. for 1 hour to obtain microcrystalline corundum abrasive.

[0030] The obtained microcrystalline corundum abrasive has a particle size of about 100 nm, ...

Embodiment 2

[0032] Preparation of microcrystalline corundum abrasive

[0033] 1) Add alumina monohydrate to a mixed solution of hydrochloric acid and water, the molar ratio of alumina monohydrate: hydrochloric acid: water is 1:6:40, and the suspension is obtained after stirring for 6.5h;

[0034] 2) Add manganese oxide to the suspension obtained in step 1), the molar ratio of aluminum oxide monohydrate to manganese oxide is 1:65, and stir for 5.5 hours to obtain a wet gel;

[0035] 3) Dry the wet gel obtained in step 2) at 120°C for 15 hours to obtain a dry gel;

[0036] 4) The dry gel obtained in step 3) is pulverized, 30-70 mesh particles are selected, and the temperature is gradually increased and calcined at 400-800°C at a heating rate of 10°C / min to obtain γ-alumina;

[0037] 5) Calcining the γ-alumina obtained in step 4) at 1250°C for 2 hours to obtain microcrystalline corundum abrasive.

[0038] The obtained microcrystalline corundum abrasive has a particle size of about 110 nm, the product h...

Embodiment 3

[0040] Preparation of microcrystalline corundum abrasive

[0041] 1) Add micropowder of alumina monohydrate to a mixed solution of hydrochloric acid and water, the molar ratio of alumina monohydrate: hydrochloric acid: water is 1:3.5:30, and the suspension is obtained after stirring for 8h;

[0042] 2) Add manganese oxide to the suspension obtained in step 1), the molar ratio of alumina monohydrate to manganese oxide is 1:80, and stir for 7 hours to obtain a wet gel;

[0043] 3) Dry the wet gel obtained in step 2) at 180°C for 6 hours to obtain a dry gel;

[0044] 4) The dry gel obtained in step 3) is pulverized, 30-70 mesh particles are selected, and the temperature is gradually increased and calcined at 400-800°C at a heating rate of 15°C / min to obtain γ-alumina;

[0045] 5) The γ-alumina obtained in step 4) is calcined at 1300° C. for 3 hours to obtain microcrystalline corundum abrasive.

[0046] The obtained microcrystalline corundum abrasive has a particle size of about 130 nm, the ...

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Abstract

The invention discloses a preparation method of a microcrystalline corundum abrasive material. The method comprises the following steps: adding an appropriate amount of hydrochloric acid solution and water into aluminum oxide monohydrate micro-powder which is used as a raw material to ensure that the raw material becomes a stable water sol; then adding manganese oxide to ensure that the water sol is gelatinized; performing drying solidification and crushing on the generated gel body; and then calcining and sintering to prepare an ultracrystalline corundum abrasive material. The preparation method is suitable for large-scale production, the technological process is easy to control, and the obtained ultracrystalline corundum abrasive material is small in particle size, compact in structure, good in obdurability and stable in grinding performance.

Description

Technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and specifically relates to a method for preparing microcrystalline corundum abrasives. Background technique [0002] Microcrystalline corundum abrasive is a high-performance wear-resistant material, suitable for grinding occasions that require high grinding efficiency and precision, especially for grinding high-strength and high-hardness materials. The abrasive is a kind of microcrystalline ceramic abrasive, the main component is aluminum oxide (Al2O3), and the grain size is generally required to be below 0.5μm, so it has high hardness, good toughness, low crushing rate, good self-sharpening, and its life can reach conventional abrasives. (White corundum, brown corundum, single crystal corundum, chromium corundum, silicon carbide, etc.) life span is several times, and it is not easy to cause burns of the ground material. [0003] There are two main methods for preparing microcrystalline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 左杰
Owner 贵州格勒尔高新材料有限公司