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Prepn of microcrystalline alumina ceramic grain

An alumina ceramic and alumina technology, which is applied in the field of preparation of microcrystalline alumina ceramic particles, can solve the problems of low durability of abrasive tools, weak cutting force, low toughness of abrasive grains, etc., and achieve good durability of abrasive tools. , toughness improvement, good wear resistance effect

Active Publication Date: 2006-05-17
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the melting process, the primary crystals of alumina in corundum are relatively large, generally reaching hundreds of microns or even several millimeters, so corundum abrasives have the characteristics of high hardness. , high brittleness is generally manifested as transgranular fracture, so it has a great negative impact on the performance of abrasive tools, mainly manifested in low toughness of abrasive grains and low durability of abrasive tools
Although the hardness of sintered corundum is also very high, because the processing process is a powder sintering process, the microstructure of the prepared material is a material with no sharp edges and corners, so the cutting force is not strong, so it can only be used as a polishing material. , and cannot be used as an abrasive that requires high cutting force

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, add 500 grams of aluminum hydroxide with D50<1 μm to 1 gram of magnesium oxide and 2 grams of aluminum fluoride, calcinate at 1200 ° C for 2 hours, and crush the prepared α-alumina into fine powder with D50<1 μm, and take α-alumina 30 grams of aluminum micropowder, 100 grams of superfine superfine aluminum hydroxide micropowder, 300 grams of pseudoboehmite, grind for 12 hours in a small ball mill in the laboratory, add 25 grams of calcium oxide and 45 grams of silicon oxide to the ground material. gram, 30 grams of magnesium oxide, and 1000ml of water are prepared into a suspension, stirred and added dropwise to the suspension with hydrochloric acid until the pH value is 1 to obtain a gel, and the gel is placed in a laboratory drying oven at 90°C Drying, the dried gel is crushed into particles smaller than 1.0mm in a jaw crusher, and the crushed particles are calcined in a muffle furnace at 1400°C for 2 hours to obtain a ceramic sintered body, and the ceramic sint...

Embodiment 2

[0024] First, add 500 grams of aluminum hydroxide with DS0-1 Calcium nitrate solution 70ml, 1g.ml -1 Magnesium nitrate solution 100ml, hydrochloric acid was added dropwise until the pH value was 2, and heated to obtain a gel, the gel was dried in a laboratory drying oven at 90 ° C, and the dried gel was crushed in a jaw crusher into For particles smaller than 0.5mm, the crushed particles are calcined in a muffle furnace at 1250°C for 4 hours to obtain a ceramic sintered body, which is crushed to obtain finished alumina ceramic particles.

Embodiment 3

[0026] Get 50 grams of α-alumina micropowder prepared in Example 1, 80 grams of superfine superfine aluminum hydroxide micropowder, 45 grams of superfine calcium oxide, 55 grams of superfine silicon oxide, 40 grams of magnesium oxide, pseudoboehmite 350 grams, 500 grams of water, prepared into a suspension, grinded for 12 hours with a small ball mill in the laboratory, to obtain a uniformly mixed suspension, add 15% dilute hydrochloric acid to the suspension until the pH value is 3, and heat to obtain a condensed Colloid, the gel is dried in a laboratory drying oven at 90°C, the dried gel is crushed into particles smaller than 1.5mm in a jaw crusher, and the crushed particles are calcined in a muffle furnace at 1650°C for 2 Hours, a ceramic sintered body is obtained, and the ceramic sintered body is broken into different particle sizes to obtain finished alumina ceramic particles.

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Abstract

The preparation process of microcrystalline alumina ceramic grain includes the following steps: preparing alpha-alumina with superfine aluminum hydroxide as initial material, mixing with aluminum hydroxide and pseudoboehmite, grinding to compound suspension, preparing gel, drying, crushing, sintering at 1250-1650 deg.c, crushing and final sieving. Compared with white corundum, brown corundum and other traditional aluminum base grinding material, the present invention has the advantages of high hardness, high toughness, high wear resistance, etc. and primary crystal of 0.2-2 micron size. This grinding tool of the said grinding material has greatly raised durability.

Description

technical field [0001] The invention discloses a preparation method of microcrystalline alumina ceramic particles, which relates to a preparation method of alumina ceramic abrasive grains for grinding materials, and is especially suitable for preparing high wear resistance alumina ceramic grinding products. Background technique [0002] α-Al 2 o 3 (commonly known as corundum) is the most stable phase of all alumina, belonging to the A2B3 type compound, trigonal crystal system, with high melting point (up to 2050 ° C), high hardness (Mohs hardness up to 9), compact structure (primary crystal true density Up to 4.01g.cm -3 ), high mechanical strength, stable chemical properties, and products with good resistance to acid and alkali. [0003] Based on α-Al 2 o 3 With the characteristics of high hardness and good wear resistance, it is widely used to manufacture various grinding materials, such as fused corundum, including white corundum, brown corundum, high alumina corundu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 陈玮马艳红
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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