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Preparation method of in-situ generated mullite whisker ceramic material

A mullite whisker and ceramic material technology, applied in the field of refractory ceramic materials, can solve the problems of fiber porous performance damage, affecting the overall strength and heat insulation effect of the product, and achieve the promotion of formation and growth, excellent thermal shock resistance stability , the effect of lowering the temperature

Inactive Publication Date: 2018-05-11
马鞍山科润冶金材料有限公司
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Problems solved by technology

Although the ceramic fiber castable is lightweight and heat-insulating, the porosity of the ceramic fiber is mostly destroyed after being mixed with the refractory bulk material, and many places are filled with refractory mud, which directly affects the overall strength of the product and the best heat insulation effect

Method used

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Embodiment Construction

[0023] A preparation method for in-situ generation of mullite whisker ceramic material, using coal gangue and high bauxite as raw materials, introducing acid-activated potassium feldspar, polycrystalline mullite fiber and chlorine fluoride, through gel injection molding Molding technology After molding, it is sintered at high temperature to generate mullite whisker ceramic material in situ.

[0024] The specific process steps are as follows:

[0025] (1) Preparation of acid-activated potassium feldspar:

[0026] After heating 12 parts of potassium feldspar powder at 105°C for 6 minutes, according to the solid-to-liquid ratio of 1:15, add it to 8% oxalic acid solution, place it in a water bath at 60°C, stir and react for 1 hour, and filter , washed 4 times with ethanol, and dried at 110° C. for 2 hours to obtain acid-activated potassium feldspar;

[0027] (2) Pre-mixing of raw material powder:

[0028] 42 parts of high alumina bauxite and 34 parts of coal gangue are crushed,...

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Abstract

The invention discloses a preparation method of an in-situ generated mullite whisker ceramic material. According to the preparation method, coal gangue and high bauxite are used as raw materials, polycrystal mullite fibers are added and used as seed crystals, chlorine trifluoride is added and used as a whisker growth catalyst, and generation of mullite whiskers in the sintering process is promoted; the crystal structure of acidized potassium feldspar is damaged, the liquid-phase formation temperature of a ceramic blank system is lowered, fusion of substances in ceramic blank is promoted, formation and growth of mullite crystals are promoted, the aim of lowering the ceramic sintering temperature is achieved, and energy consumption is lowered; through gel injection molding and two-segment high-temperature sintering, in-situ generated mullite whiskers develop completely, a three-dimensional network structure is formed in the ceramic material, the ceramic material has high porosity, a gelinjection molding technology is adopted at the same time, the pore distribution state of final ceramic can be adjusted and controlled, and the light heat insulation performance of the ceramic materialis improved.

Description

technical field [0001] The invention relates to the technical field of refractory ceramic materials, in particular to a preparation method for in-situ generation of mullite whisker ceramic materials. Background technique [0002] So far, the technological process of the ceramic fiber refractory materials developed and produced is basically that the ceramic fiber cotton is crushed and directly mixed into various unshaped refractory bulk materials, and then molded by casting. Broken ceramic fibers have poor dispersion, and most of them exist in the form of cloud flakes or flocs with uneven sizes. Although the ceramic fiber castable is lightweight and heat-insulating, the porosity of the ceramic fiber is mostly destroyed after being mixed with the refractory bulk material, and many places are filled with refractory mud, which directly affects the overall strength of the product and the best heat insulation effect. [0003] The mullite fiber is used at a temperature of 1500-160...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/624C04B35/64
CPCC04B35/62204C04B35/624C04B35/64C04B35/803C04B2235/3217C04B2235/3463C04B2235/3472C04B2235/5276C04B2235/661
Inventor 鲁庭志
Owner 马鞍山科润冶金材料有限公司
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