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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 alumina ceramics that require dry preparation or require net shape dimensions

Method used

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  • Preparation method of high-purity aluminum oxide ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of the present embodiment high-purity alumina ceramics, its steps are as follows:

[0029] (1) Get 20g aluminum isopropoxide and dissolve in 100ml xylene to form aluminum isopropoxide solution;

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

[0031] (3) Put the above 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 at the bottom;

[0032] (4) Dry the above alumina powder slurry in an oven at 100°C, then heat it up to 800°C in a muffle furnace at a rate of 3°C / min for calcination, and keep it warm for 2 hours to obtain pretreated alumina powder body;

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

Embodiment 2

[0036] A kind of preparation method of the present embodiment high-purity alumina ceramics, its steps are as follows:

[0037] (1) Get 20g aluminum isopropoxide and dissolve in 100ml xylene to form aluminum isopropoxide solution;

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

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

[0040] (4) Dry the above alumina powder slurry in an oven at 100°C, then heat it up to 750°C in a muffle furnace at a rate of 3°C / min for calcination, and keep it warm for 2 hours to ...

Embodiment 3

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

[0045] In step (2), the alumina powder is 120g; in step (5), methyl cellulose, tung oil, glycerin, and water are added to the pretreated alumina powder, and a suitable The mud material is extruded to obtain a round tube (or cylindrical, multi-channel tube); then 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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