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Mullite ceramic with high strength and low shrinkage performance, and preparation method thereof

A low-shrinkage, high-strength technology, applied in the field of mullite ceramics and its preparation, to achieve the effects of inhibiting a large amount of generation, inhibiting ceramic shrinkage, and improving ceramic strength

Active Publication Date: 2021-07-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a mullite ceramic with high strength and low shrinkage and its preparation method, which is used to solve the problem that the existing mullite ceramic preparation method has high strength, high temperature resistance and low shrinkage. Three performance issues

Method used

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  • Mullite ceramic with high strength and low shrinkage performance, and preparation method thereof
  • Mullite ceramic with high strength and low shrinkage performance, and preparation method thereof
  • Mullite ceramic with high strength and low shrinkage performance, and preparation method thereof

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preparation example Construction

[0022] For the second solution in the present invention, a method for preparing mullite ceramics with high strength and low shrinkage properties is provided, which is used to prepare mullite ceramics with high strength and low shrinkage properties in the aforementioned first solution. Laishi ceramics, the steps include: mixing the silicon source and the aluminum source according to the mass ratio (40-50): (50-60) and ball milling, and then sieving, preferably 250-500 mesh sieve, to obtain the mixture; and then The mixture is pressed into a green body and fired at high temperature to obtain mullite ceramics with high strength and low shrinkage. Among them, the specific process conditions of high-temperature firing are preferably: the firing temperature is 1550-1650° C., the heating rate is 10-20° C. / min, and the holding time is 10-30 minutes.

[0023]Among them, the silicon source is coal series kaolin, and the preferred particle size of the silicon source is 20-50 μm; in terms...

Embodiment 1

[0029] In this embodiment, the steps for preparing mullite ceramics with high strength and low shrinkage properties are as follows:

[0030] (1) Coal series kaolin is selected as the silicon source, in terms of mass percentage, the chemical composition of the silicon source is specifically: SiO 2 45%, Al 2 o 3 36%, Fe 2 o 3 0.011%, CaO 0.035%, K 2 O-Na 2 O 0.015%, carbonaceous 15%; the particle size of the silicon source is 20-50 μm.

[0031] (2) Select α-Al 2 o 3 and Al(OH) 3 The mixture of the aluminum source is used as the aluminum source, and the chemical composition of the aluminum source is specifically: α-Al 2 o 3 65%, Al(OH) 3 35%; the particle size of the aluminum source is 10-20 μm.

[0032] (3) After the silicon source and the aluminum source are mixed and ball milled according to the mass ratio of 50:50, the mixture is sieved with a 300-mesh sieve to obtain the mixture; Under the conditions of 15°C / min and holding time of 20min, the green body is f...

Embodiment 2

[0035] In this embodiment, the steps for preparing mullite ceramics with high strength and low shrinkage properties are as follows:

[0036] (1) Coal series kaolin is selected as the silicon source, in terms of mass percentage, the chemical composition of the silicon source is specifically: SiO 2 40%, Al 2 o 3 38%, Fe 2 o 3 0.01%, CaO 0.03%, K 2 O-Na 2 O 0.01%, carbonaceous 18%; the particle size of the silicon source is 20-50 μm.

[0037] (2) Select α-Al 2 o 3 and Al(OH) 3 The mixture of the aluminum source is used as the aluminum source, and the chemical composition of the aluminum source is specifically: α-Al 2 o 3 60%, Al(OH) 3 40%; the particle size of the aluminum source is 10-20 μm.

[0038] (3) After the silicon source and the aluminum source are mixed and ball milled in a mass ratio of 45:55, the mixture is sieved with a 250-mesh sieve to obtain the mixture; Under the conditions of 10°C / min and holding time of 10min, the green body is fired to obtain ...

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Abstract

The invention discloses a mullite ceramic with high strength and low shrinkage performance, and a preparation method thereof. The mullite ceramic with high strength and low shrinkage performance is composed of a silicon source and an aluminum source, and the mass ratio of the silicon source to the aluminum source is (40-50): (50-60); and the silicon source is coal series kaolin, and the aluminum source is a mixture of alpha-Al2O3 and Al(OH)3. According to the invention, by introducing the coal series kaolin, a secondary mullite reaction is continuously carried out in the high-temperature firing process of 1550-1650 DEG C, and the generation of a large amount of a liquid phase is inhibited, so that the use temperature of the ceramic is increased, and the shrinkage rate is reduced; and meanwhile, micropores are formed by using a small amount of introduced carbon, so that not only can the ceramic shrinkage be effectively inhibited, but also the internal stress is dispersed, and the ceramic strength is improved.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a mullite ceramic with high strength and low shrinkage performance and a preparation method thereof. Background technique [0002] Mullite ceramics has the characteristics of small thermal expansion coefficient, excellent thermal shock resistance and corrosion resistance, and is widely used as the lining of various high-temperature furnaces, including furnace kilns, blast furnaces, hot iron pouring troughs and continuous casting furnaces, etc. Lining material. Since mullite ceramics usually contain part of the glass phase, in order to avoid bubbling, creep and rupture of the material during use, mullite ceramics need to have a higher service temperature and strength. On the other hand, mullite ceramics is usually accompanied by volume shrinkage during the firing process, which affects the quality of the product, such as causing caliber distortion and geometric shape changes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/64
CPCC04B35/185C04B35/64C04B2235/349C04B2235/3218C04B2235/3217C04B2235/6562C04B2235/6567C04B2235/9615C04B2235/96Y02P40/60
Inventor 吴建锋丁春江徐晓虹张亚祥
Owner WUHAN UNIV OF TECH
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