Preparation method of high-purity aluminum oxide ceramic

A high-purity alumina, alumina technology, applied in the field of ceramic materials, to avoid agglomeration, improve sintering effect, ensure the effect of purity

Active Publication Date: 2013-09-18
重庆兀盾纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, this method is not suitable for the preparation of alumin

Method used

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  • Preparation method of high-purity aluminum oxide ceramic
  • Preparation method of high-purity aluminum oxide ceramic
  • Preparation method of high-purity aluminum oxide ceramic

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0027] Example one:

[0028] In this embodiment, a method for preparing high-purity alumina ceramics has the following steps:

[0029] (1) Dissolve 20 g of aluminum isopropoxide in 100 ml of xylene to form an aluminum isopropoxide solution;

[0030] (2) Take 100g of alumina powder (W40, average particle size of 40μm) and stir and mix the above aluminum isopropoxide solution to obtain a mixed suspension;

[0031] (3) Put the above-mentioned mixed suspension in a hydrothermal reaction kettle and treat it at 150°C for 10 hours; then remove the upper layer solution of the mixed suspension to obtain the alumina slurry of the bottom layer;

[0032] (4) After drying the above alumina slurry in an oven at a temperature of 100°C, it is calcined in a muffle furnace at a temperature rising rate of 3°C / min to 800°C and kept for 2 hours to obtain pretreated alumina powder body;

[0033] (5) Add 2wt% PVA to the above-mentioned pretreated alumina powder, dry-press it under 6Mpa pressure, and press it ...

Example Embodiment

[0035] Embodiment two:

[0036] In this embodiment, a method for preparing high-purity alumina ceramics has the following steps:

[0037] (1) Dissolve 20 g of aluminum isopropoxide in 100 ml of xylene to form an aluminum isopropoxide solution;

[0038] (2) Take 90g of alumina powder (W40, average particle size of 40μm), 10g of alumina powder (W1, average particle size of 1μm), ball mill and mix them uniformly to obtain mixed alumina powder, and then mix with the above aluminum isopropoxide The solution is stirred and mixed to obtain a mixed suspension;

[0039] (3) Put the above-mentioned mixed suspension in a hydrothermal reaction vessel and treat it at 180°C for 8 hours; then remove the upper layer solution of the mixed suspension to obtain the alumina slurry of the bottom layer;

[0040] (4) After drying the above alumina slurry in an oven at a temperature of 100°C, it is calcined in a muffle furnace at a heating rate of 3°C / min to 750°C, and kept for 2 hours to obtain pretreated al...

Example Embodiment

[0043] Embodiment three:

[0044] The difference between the preparation method of a high-purity alumina ceramic in this embodiment and the first embodiment is:

[0045] In step (2), the alumina powder is 120g; in step (5), methyl cellulose, tung oil, glycerol, and water are added to the pretreated alumina powder, and a suitable material is obtained through mixing, mud refining, aging, etc. The mud is extruded to obtain a round tube (or cylindrical, multi-channel tube); then it is calcined at a temperature of 1650°C and kept for 2 hours to obtain a high-purity alumina rod (tube).

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Abstract

The invention discloses a preparation method of a high-purity aluminum oxide ceramic. According to the preparation method, a nano Al2O3 coating formed on the surfaces of aluminum oxide particles is used as a sintering aid to ensure that a small amount of the sintering aid can be uniformly dispersed in a main phase, so that uniform adding of a small dose of the sintering aid is realized. The preparation method not only ensures the purity and performance of the high-purity aluminum oxide ceramic and meets process requirements for preparation of the aluminum oxide ceramic, but also effectively solves the problem that when the particle size difference of main phase powder and the sintering aid is large, particles of a nano auxiliary agent are gathered in a main phase powder particle gap; and moreover, partial over-firing is avoided, so that the uniformity of sintering of the main phase powder particles and the sintering assisting effect of the sintering aid are effectively improved.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a preparation method of high-purity alumina ceramics. Background technique [0002] Alumina ceramics are a kind of aluminum oxide (AL 2 o 3 ) as the main material, has good conductivity, mechanical strength and high temperature resistance, and is the basic material for manufacturing high-performance ceramic components such as high strength, wear resistance and high temperature resistance, and has been widely used in machinery, communications, semiconductors, Pharmaceutical, food, petroleum, chemical, aerospace and other fields. [0003] The melting point of alumina is relatively high, and its sintering temperature is correspondingly high, especially for the sintering of large-diameter alumina particles, which will result in high energy consumption and high production cost. In order to reduce the sintering temperature of alumina, it is usually necessary to add sinteri...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 汪永清周健儿常启兵张小珍梁健胡学兵
Owner 重庆兀盾纳米科技有限公司
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