CN-121346540-B - Heat-resistant ceramic fiber composite flashboard and preparation method and application thereof

Abstract

The application relates to the technical field of industrial furnace systems, solves the problem of performance reduction caused by structural failure and uneven temperature field due to unmatched thermal expansion coefficients in the prior art, and in particular relates to a heat-resistant ceramic fiber composite flashboard and a preparation method thereof, wherein the heat-resistant ceramic fiber composite flashboard is prepared by solidifying and sintering a pre-oxidized ferrochrome aluminum alloy skeleton and a ceramic matrix filled in the skeleton at a medium temperature of 800-1000 ℃, wherein the ceramic matrix consists of polycrystalline alumina fiber, a Y 2 O 3 stabilizer, nanometer zirconia particles and an acid aluminum phosphate water-based solution. The composite flashboard has excellent high-temperature structural stability, thermal shock resistance and temperature uniformity, is suitable for high-temperature industrial environments with the temperature of more than 1200 ℃, and has obviously prolonged service life.

Inventors

• SHI ZIHAO
• SHI XIAOBING
• HAN SONG
• TANG PENG
• ZHOU YONGQIANG

Assignees

• 山西阿拉丁新材料有限公司

Dates

Publication Date

20260512

Application Date

20251217

Claims (4)

1. 1. The heat-resistant ceramic fiber composite flashboard is characterized by being prepared by solidifying and sintering a pre-oxidized iron-chromium-aluminum alloy skeleton and a ceramic matrix filled in the skeleton at a medium temperature of 800-1000 ℃; the weight ratio of the pre-oxidized iron-chromium-aluminum alloy framework to the ceramic matrix is 1 (3-5); The iron-chromium-aluminum alloy framework is in a lattice, porous or corrugated structure; the brand of the iron-chromium-aluminum alloy skeleton is 0Cr25Al5; The pre-oxidation treatment condition is that the mixture is heated for 1 to 2 hours at the temperature of 700 to 900 ℃ in the air atmosphere; The ceramic matrix comprises the following components in percentage by weight: 80-90wt% of polycrystalline alumina fiber, 1-3wt% of Y2O3 stabilizer, 3-5wt% of nano zirconia particles and the balance of water-based solution of acid aluminum phosphate; The polycrystalline alumina fiber is alpha-Al 2O3 with Al2O3 content of not less than 99.5 percent and fiber diameter of 7-12 mu m.
2. 2. The heat-resistant ceramic fiber composite ram of claim 1, wherein the aqueous solution of acid aluminum phosphate is a solution of aluminum dihydrogen phosphate having a concentration of 30-50%.
3. 3. The method for producing a heat-resistant ceramic fiber composite shutter according to any one of claims 1 to 2, comprising the steps of: a) Pre-oxidizing the iron-chromium-aluminum alloy skeleton; b) Mixing polycrystalline alumina fiber, a Y2O3 stabilizer, nano zirconia particles and an aqueous solution of acid aluminum phosphate according to corresponding weight ratio to prepare ceramic slurry; c) Pouring the ceramic slurry obtained in the step b) into the alloy framework in the step a), and after shaping, performing medium-temperature curing sintering for 2-4 hours at 800-1000 ℃ to obtain the heat-resistant ceramic fiber composite flashboard.
4. 4. The use of the heat-resistant ceramic fiber composite flashboard of claim 1 or the heat-resistant ceramic fiber composite flashboard obtained in claim 3 in a carbon flue flashboard or a high-temperature industrial furnace system, which is characterized in that the long-acting heat-resistant ceramic fiber composite flashboard is suitable for high-temperature industrial environments with the temperature of more than 1200 ℃.

Description

Heat-resistant ceramic fiber composite flashboard and preparation method and application thereof Technical Field The application relates to the field of industrial kiln materials, in particular to a heat-resistant ceramic fiber composite flashboard and a preparation method thereof. Background The flashboard in the existing high-temperature industrial scene mostly adopts heat-resistant cast steel or a composite flashboard formed by combining zirconium-containing ceramic fibers and stainless steel plates, and compared with the heat-resistant cast steel, the composite flashboard has the advantages of obtaining better thermal shock resistance, mechanical strength and service life due to the additional addition of bulk density and paint. However, the combination of metal and ceramic suffers from both thermal expansion coefficient mismatch and "cold-core" effects. In the related art, the composite flashboard formed by combining zirconium-containing ceramic fibers and stainless steel plates has great difference of thermal expansion coefficients of a metal skeleton and a ceramic fiber module, so that interfacial shear stress is generated in repeated thermal circulation, material stripping or cracking is easy to occur, the metal skeleton becomes a heat dissipation source at high temperature, uneven temperature distribution in the flashboard is caused, the thermal stress is additionally increased, and the metal strength is possibly reduced. There have also been attempts by enterprises to alleviate the above problems by improving the material formulation or surface treating the metal skeleton, but these approaches have failed to fundamentally solve the structural failure and the performance degradation caused by the non-uniformity of the temperature field due to the mismatch of the thermal expansion coefficients. Based on the heat, the application particularly provides a heat-resistant ceramic fiber composite flashboard, and a preparation method and application thereof. Disclosure of Invention In order to solve the technical problems, the application provides the heat-resistant ceramic fiber composite flashboard, the preparation method and the application thereof, which can overcome the technical barrier of metal and ceramic combination while maintaining the comprehensive performance of materials, and realize longer service life and higher reliability. In a first aspect, the application provides a heat-resistant ceramic fiber composite flashboard, which adopts the following technical scheme: a heat-resistant ceramic fiber composite flashboard is prepared by solidifying and sintering a pre-oxidized iron-chromium-aluminum alloy skeleton and a ceramic matrix filled in the skeleton at a medium temperature of 800-1000 ℃; The iron-chromium-aluminum alloy framework is in a lattice, porous or corrugated structure; The ceramic matrix consists of polycrystalline alumina fibers, a Y 2O3 stabilizer, nano zirconia particles and an aqueous solution of acid aluminum phosphate. Preferably, the weight ratio of the pre-oxidized iron-chromium-aluminum alloy framework to the ceramic matrix is 1 (3-5). Preferably, the brand of the iron-chromium-aluminum alloy skeleton is 0Cr25Al5; The pre-oxidation treatment condition is that the mixture is heated for 1 to 2 hours at the temperature of 700 to 900 ℃ in the air atmosphere. Preferably, the ceramic matrix is composed of the following components in percentage by weight: 80-90wt% of polycrystalline alumina fiber, 1-3wt% of Y 2O3 stabilizer, 3-5wt% of nano zirconia particles and the balance of water-based solution of acid aluminum phosphate. Preferably, the polycrystalline alumina fiber is alpha-Al 2O3 with the Al 2O3 content of greater than or equal to 99.5 percent, and the fiber diameter is 7-12 mu m. Preferably, the aqueous solution of acid aluminum phosphate is a solution of aluminum dihydrogen phosphate with a concentration of 30-50%. In a second aspect, the application provides a method for preparing a heat-resistant ceramic fiber composite flashboard, which adopts the following technical scheme: a preparation method of a heat-resistant ceramic fiber composite flashboard comprises the following steps: a) Pre-oxidizing the iron-chromium-aluminum alloy skeleton; b) Mixing polycrystalline alumina fiber, Y 2O3 stabilizer, nano zirconia particles and water-based solution of acid aluminum phosphate according to the corresponding weight ratio to prepare ceramic slurry; c) Pouring the ceramic slurry obtained in the step b) into the alloy framework in the step a), and after shaping, performing medium-temperature curing sintering for 2-4 hours at 800-1000 ℃ to obtain the heat-resistant ceramic fiber composite flashboard. In a third aspect, the application provides a heat-resistant ceramic fiber composite flashboard, or application of the heat-resistant ceramic fiber composite flashboard obtained by the process in a carbon flue flashboard or a high-temperature industrial furnace kiln system, which is