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Alpha-alumina-based abrasive containing sheet-shaped structures, and preparation method thereof

An alumina-based, sheet-like structure technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of high cost and achieve the effects of high grinding efficiency, long durability, mature and stable process

Active Publication Date: 2013-04-03
山东英格瓷四砂泰山磨料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the defects of high cost of using pure boehmite as the main raw material for the preparation of ceramic abrasives in the prior art, and provide a low-cost boehmite semi-finished product as the main raw material without adding seed crystals, through sol Gel method to prepare α-alumina-based abrasive and its preparation method

Method used

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  • Alpha-alumina-based abrasive containing sheet-shaped structures, and preparation method thereof
  • Alpha-alumina-based abrasive containing sheet-shaped structures, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Add 16.8 kg of purified water and 42 kg of semi-finished boehmite with a water content of 70% to a 150-liter blender with vacuum function, start the blender to stir and beat into a slurry, add 1.6 kg of 20% nitric acid solution, and stir for 5 minutes. Stop stirring, slurry is input into colloid mill, further refines slurry, slurry is transferred in the former mixer after coming out from colloid mill, vacuumizes, starts mixer, adds the nitric acid of 3 kilograms of 20%, stirs evenly. After a while, a gel forms.

[0036] Transfer the above-prepared gel into a stainless steel tray and put it in an oven at 100°C until the gel becomes brittle and cracks, becoming fragments with a diameter of several millimeters to more than ten millimeters, and some particles can reach several centimeters , the size of the pieces depends on the drying speed. The faster the drying speed, the smaller the particles.

[0037] The dried fragments are further crushed, and the required particle ...

Embodiment 2

[0043] In a 150-liter blender with vacuum function, add 0.6 kg of pure water, 62.5 kg of semi-finished boehmite with a water content of 80%, add 1.6 kg of 20% nitric acid solution, and stir for 5 minutes. Stop stirring, slurry is input colloid mill, further thins slurry, slurry is transferred in the former mixer after coming out from colloid mill, vacuumizes, starts mixer, adds the nitric acid of 3.2 kilograms of 20%, stirs evenly. After a while, a gel forms. Following the same example 1, but the difference is: when preparing the modifier solution, 10 kilograms of aqueous solution contained 520 grams of yttrium nitrate hexahydrate, 815 grams of lanthanum nitrate hexahydrate, 983 grams of magnesium nitrate hexahydrate and 39 grams of cobalt nitrate hexahydrate .

[0044] The resulting product has a particle density of 3.90 g / cm3 and a microhardness of 20.5 Gpa. The grains of ceramic microcrystalline abrasive particles are about 2 microns, containing a flaky structure, and the ...

Embodiment 3

[0047] In a 30-liter kneader with a vacuum function, add 10 kilograms of water-containing 75% boehmite semi-finished products, add the dried gel in Example 1, crush and sieve, 2 kilograms of fine gel particles under a 120 mesh sieve, and start kneading Machine kneading for 5 minutes, then add 0.9 kg of nitric acid with a concentration of 20%, 2 kg contains 132 grams of yttrium nitrate hexahydrate, 207 grams of lanthanum nitrate hexahydrate, 250 grams of magnesium nitrate hexahydrate and 15 grams of cobalt nitrate hexahydrate aqueous solution, continue Start the kneader and knead for 60 minutes, then take it out and dry it, crush it, sieve it, calcinate it at 800°C for 10 minutes, and then sinter it at 1500°C for 60 minutes. The resulting product has a particle density of 3.90 g / cubic centimeter, a hardness of 20 Gpa, and contains a flake structure, and the sum of yttrium oxide, lanthanum oxide, magnesium oxide and cobalt oxide accounts for about 4%.

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Abstract

The invention specifically relates to an alpha-alumina-based abrasive containing sheet-shaped structures, and a preparation method thereof. The abrasive is characterized in that particle density is higher than 3.88, a microhardness is higher than 20GPa, sizes of grains forming particles are lower than 5 micrometers, and the abrasive contains sheet-shaped structures. The preparation method comprises the steps that: (1) pure water and a boehmite semi-finished product are added into a stirring machine with a vacuum pumping function; and the mixture is stirred into slurry; (2) dilute nitric acid with a concentration of 20% is added; stirring is carried out under a vacuum state, such that a sol and then a gel are gradually formed; (3) the gel is bake-dried and crushed; on-sieve particles with a size higher than 120 meshes are obtained by sieving; (4) the sieved particles are calcined, and the calcined particles are sintered; and (5) finished-product particles are obtained by sieving. The preparation method provided by the invention has the advantages of low raw material cost, and mature and stable process. With the method provided by the invention, the prepared abrasive particles contain sheet-shaped structures. Prepared abrasive product has the characteristics such as high grinding efficiency, good self-sharpening performance, long durability, and the like.

Description

technical field [0001] The invention belongs to the field of α-alumina ceramic abrasive particles and a preparation method thereof, and in particular relates to a low-cost α-alumina-based abrasive containing a flake structure and a preparation method thereof. Background technique [0002] The general method of preparing ceramic abrasives by sol-gel method is to mix pure boehmite with deionized water, seed crystals and nitric acid to form a uniform and delicate sol or gel, then dry to remove the moisture in the gel, and then dry The large particles of the gel are broken into particles slightly larger than the required size, calcined at a temperature of 500°C to 800°C, and then calcined at a temperature of 1300°C to 1500°C for 5 to 60 minutes to form a hard sintered body of alumina. The density of the sintered abrasive particles is generally greater than 3.5 g / cm3, more preferably greater than 3.8 g / cm3, most preferably greater than 3.9 g / cm3, and the hardness is generally gre...

Claims

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Application Information

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IPC IPC(8): C09K3/14
Inventor 翟涵刘海红
Owner 山东英格瓷四砂泰山磨料有限公司
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