Preparation method of aluminum hydroxide gel and microlite alpha-Al2O3 aggregate

A technology of aluminum hydroxide gel and aluminum hydroxide, applied in the direction of aluminum hydroxide preparation, aluminum oxide/hydroxide preparation, ammonium nitrate, etc., can solve the complex process, uneven dispersion of sintering aids, impurities High content and other issues
CN102807243AActive Publication Date: 2012-12-05SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2012-12-05

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Abstract

The invention relates to an aluminum hydroxide gel. The preparation method includes performing reaction of aluminum nitrate hydrate and ammonia water to obtain aluminum hydroxide, adding additive to suspension after ball-milling to obtain aluminum hydroxide gel, and drying to obtain aluminum hydroxide dried gel; and grinding and calcining the aluminum hydroxide dried gel to prepare microlite alpha-Al2O3 aggregate. The preparation method is suitable for large-scale production of the microlite alpha-Al2O3 aggregate, conditions of process are easy to control, grain size of primary grain of the prepared microlite alpha-Al2O3 aggregate is 50-400nm, particle size of secondary aggregate particle of the prepared microlite alpha-Al2O3 aggregate is 75-600um, the prepared microlite alpha-Al2O3 aggregate is compact in structure, density is 3.90-3.98g / cm<3>, and hardness is 19-24GPa. The prepared microlite alpha-Al2O3 aggregate can be used for abrasive, high-temperature-resistant material, electronic device material, high-frequency insulation material, aerospace material, information material and the like.
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Description

technical field

[0001] The invention relates to an aluminum hydroxide gel and the preparation of microcrystalline α-Al by using the aluminum hydroxide gel as a raw material 2 O 3 The aggregate material belongs to the field of inorganic non-metallic materials. Background technique

[0002] Microcrystalline α-Al 2 O 3 Aggregate materials can be used in many basic industries and fields such as chemistry, insulating materials, catalyst carriers, ceramics, aerospace, electronics, etc., especially as ceramic materials are the most widely used. Microcrystalline α-Al 2 O 3 As an important ceramic material, aggregate has always been a research hotspot at home and abroad, especially the research and application of microcrystalline corundum abrasives, electronic ceramics and transparent ceramics, which have developed rapidly in recent years, are the most typical.

[0003] α-Al since the 1980s 2 O 3 The preparation technology has developed rapidly. α-Al 2 O 3 It is usually ob...

Claims

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