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Alpha-alumina-based abrasive and preparation method thereof

An alumina-based, alumina-based technology, applied in chemical instruments and methods, and other chemical processes, can solve the problem of high cost and achieve high grinding efficiency, low raw material cost, 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

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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, which is prepared by sol-gel method α-alumina-based abrasive and its preparation method

Method used

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  • Alpha-alumina-based abrasive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]In a 150-liter vacuum mixer, add 16.8 kg of pure water, 42 kg of semi-finished boehmite with a water content of 70%, and 3 kg of alumina seed grinding liquid with a concentration of 4%, start the mixer to stir and beat into a slurry, and add a concentration of 20% After 1.6 kg of nitric acid solution, stir for 5 minutes. Stop stirring, put the slurry into the colloid mill, further refine the slurry, transfer the slurry from the colloid mill to the original mixer, vacuumize, start the mixer, add 3 kilograms of 20% nitric acid, and then add 1 liter containing 17% Aqueous solution of magnesium nitrate hexahydrate, stir well. At this point a gel has formed.

[0034] Transfer the above-prepared gel into a stainless steel pan and put it in an oven at 120°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 dry...

Embodiment 2

[0040] In a 150-liter vacuum mixer, add 0.6 kg of pure water, 62.5 kg of boehmite semi-finished products with a water content of 80%, and 6 kg of alumina seed grinding liquid with a concentration of 4%, start the mixer to stir and beat into a slurry, and add a concentration of 20% After 1.6 kg of nitric acid solution, stir for 5 minutes. Stop stirring, put the slurry into the colloid mill, further refine the slurry, transfer the slurry from the colloid mill to the original mixer, vacuumize, start the mixer, add 3.2 kg of 20% nitric acid, and then add 1 liter containing 17% Aqueous solution of magnesium nitrate hexahydrate, stir well. At this point a gel has formed.

[0041] The following is the same as described in Example 1, the calcination temperature is controlled at 750° C., and the sintering time is 15 minutes; the sintering temperature is 1330° C., and the sintering time is 20 minutes. The resulting product has a density of 3.95 g / cm 3 , a microhardness of 23 GPa, and ...

Embodiment 3

[0044] As described in Example 1, the difference is that the calcining and sintering are carried out in a 24-meter-long roller kiln, the temperature in the calcining zone is set at 700°C, the calcining time is 60 minutes, the temperature in the sintering zone is set at 1360°C, and the sintering time is set at 1360°C. Set at 60 minutes. The obtained product has a density of 3.94 g / cm 3 , a microhardness of 20.5 GPa, a microhardness of 23 GPa, and a grain size of 0.4 micron constituting ceramic microcrystalline abrasive particles.

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Abstract

The invention specifically relates to an alpha-alumina-based abrasive and a preparation method thereof. The abrasive is characterized in that a particle density is higher than 3.88g / cm<3>, a micro hardness is higher than 20GPa, and particle-forming grain size is 0.15-0.3 micrometers. The preparation method comprises the steps that: (1) pure water, a boehmite half-finished product and alumina seed grind solution are added into a stirrer with a vacuum pumping function, and the raw materials are stirred and beaten into slurry; (2) dilute nitric acid with a concentration of 20% is added into the slurry, and a sol and then a gel are gradually formed in a vacuum state; (3) the gel is bake-dried under a temperature of 140 DEG C, and is crushed; on-sieve particles are obtained by using a 120-mesh sieve; (4) the obtained particles are calcined, and the calcined particles are sintered; and (5) finished product particles are obtained by sieving. The method provided by the invention has the advantages of low raw material cost, and mature and stable process. With the abrasive particles provided by the invention, a prepared abrasive product has the characteristics such as high grinding efficiency, good self-sharpening performance, and long durability.

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 and a preparation method thereof. Background technique [0002] The general method of preparing ceramic abrasives by melt-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 put The dried large gel particles are broken into particles slightly larger than the required size, and then 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 alumina body, the sintered abrasive particle density is generally greater than 3.5 g / cm3, better greater than 3.8 g / cm3, preferably greater than 3.9 g / cm3, and the hardness is generally greater than 20 Gpa. [0003] Pure boehmite is ...

Claims

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Application Information

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IPC IPC(8): C09K3/14C04B35/10C04B35/624
CPCC04B2235/77C04B35/1115C09K3/14C04B2235/3218C04B35/10C04B2235/3272C09K3/1409C04B2235/785
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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