Heat-resistant ceramic fiber composite flashboard as well as preparation method and application thereof

Abstract

The invention relates to the technical field of industrial furnace systems, solves the problems of structural failure caused by mismatching of thermal expansion coefficients and performance reduction caused by non-uniformity of a temperature field, and particularly relates to a heat-resistant ceramic fiber composite flashboard and a preparation method thereof. The composite material is prepared by curing and sintering a pre-oxidized iron-chromium-aluminum alloy framework and a ceramic matrix filled in the framework at the medium temperature of 800-1000 DEG C, and the ceramic matrix is composed of polycrystalline alumina fibers, a Y2O3 stabilizer, nano-zirconia particles and a water-based solution of acid aluminum phosphate. The composite flashboard has excellent high-temperature structural stability, thermal shock resistance and temperature uniformity and is suitable for the high-temperature industrial environment of 1200 DEG C or above, and the service life is remarkably prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial furnace materials, and more particularly, to a heat-resistant ceramic fiber composite damper and a preparation method thereof. BACKGROUND

[0002] The existing high-temperature industrial scene damper is mostly made of heat-resistant cast steel or a composite damper combined with zirconium-containing ceramic fiber and stainless steel plate. Compared with heat-resistant cast steel, the composite damper has better thermal shock resistance, mechanical strength and service life due to the additional addition of bulk density and coating. However, the combination of metal and ceramic faces two major problems of mismatched thermal expansion coefficients and "cold core" effect.

[0003] In the related art, the composite damper combined with zirconium-containing ceramic fiber and stainless steel plate has a large difference in thermal expansion coefficients between the metal skeleton and the ceramic fiber module, which causes interfacial shear stress in repeated thermal cycles and easily causes material peeling or cracking. The metal skeleton becomes a heat sink at high temperature, causing uneven temperature distribution inside the damper, additional thermal stress, and possibly reducing the strength of the metal.

[0004] Therefore, some enterprises have tried to alleviate the above problems by improving the material formula or surface treatment of the metal skeleton, but these means have not fundamentally solved the structural failure caused by the mismatched thermal expansion coefficients and the performance decline caused by the uneven temperature field. Based on this, the present application provides a heat-resistant ceramic fiber composite damper and a preparation method and application thereof. SUMMARY

[0005] To solve the above technical problems, the present application provides a heat-resistant ceramic fiber composite damper and a preparation method and application thereof, which can overcome the technical obstacles of combining metal and ceramic while maintaining the comprehensive performance of the material, achieve longer service life and higher reliability.

[0006] In a first aspect, the present application provides a heat-resistant ceramic fiber composite damper, which adopts the following technical solution:

[0007] A heat-resistant ceramic fiber composite damper is made of a pre-oxidized iron-chromium-aluminum alloy skeleton and a ceramic matrix filled in the skeleton and sintered at 800-1000℃.

[0008] The iron-chromium-aluminum alloy skeleton has a lattice, porous or corrugated structure.

[0009] The ceramic matrix is composed of polycrystalline alumina fiber, Y2O3 stabilizer, nano zirconia particles and acid aluminum phosphate aqueous solution.

[0010] Preferably, the weight ratio of the pre-oxidized iron-chromium-aluminum alloy skeleton and the ceramic matrix is 1:(3-5).

[0011] Preferably, the grade of the iron-chromium-aluminum alloy skeleton is 0Cr25Al5;

[0012] The pre-oxidation treatment condition is heating at 700-900℃ for 1-2 hours in air atmosphere.

[0013] Preferably, the ceramic matrix is composed of the following components by weight percentage:

[0014] Polycrystalline alumina fiber 80-90wt%, Y2O3 stabilizer 1-3wt%, nano zirconia particles 3-5wt%, and water-based solution of acid aluminum phosphate as the balance.

[0015] Preferably, the polycrystalline alumina fiber is α-Al2O3 with Al2O3 content≧99.5%, and the fiber diameter is 7-12μm.

[0016] Preferably, the water-based solution of acid aluminum phosphate is aluminum dihydrogen phosphate solution with concentration of 30-50%.

[0017] In the second aspect, the application provides a preparation method of a heat-resistant ceramic fiber composite brake plate, which adopts the following technical scheme:

[0018] A preparation method of a heat-resistant ceramic fiber composite brake plate, comprising the following steps:

[0019] a) Pre-oxidation treatment of the iron-chromium-aluminum alloy skeleton;

[0020] b) Mixing polycrystalline alumina fiber, Y2O3 stabilizer, nano zirconia particles, and water-based solution of acid aluminum phosphate according to the corresponding weight ratio to prepare ceramic slurry;

[0021] c) Pouring the ceramic slurry obtained in b) into the alloy skeleton in a), and after shaping, performing medium-temperature solidification sintering at 800-1000℃ for 2-4h to obtain the heat-resistant ceramic fiber composite brake plate.

[0022] In the third aspect, the application provides a heat-resistant ceramic fiber composite brake plate, or the application of the heat-resistant ceramic fiber composite brake plate obtained by the above process in a carbon flue brake plate or a high-temperature industrial furnace system, characterized in that it is long-acting and suitable for high-temperature industrial environments above 1200℃.

[0023] In summary, the application has the following beneficial effects:

[0024] 1. The heat-resistant ceramic fiber composite brake plate in the application realizes the synergistic effect of macroscopic mechanical support and microscopic crack inhibition through the composite structure of the pre-oxidized iron-chromium-aluminum alloy skeleton and the multi-scale toughening ceramic matrix, thereby ensuring its excellent structural stability, thermal shock resistance, and mechanical strength in high-temperature environments above 1200℃.

[0025] 2. The heat-resistant ceramic fiber composite damper prepared by the method in the application, thanks to the precise process control of pre-oxidation, slurry filling and medium-temperature solidification sintering, the obtained product has stable and uniform performance, good high-temperature toughness and durability, excellent long-term stability, and remarkable industrial value and application prospect;

[0026] 3. The heat-resistant ceramic fiber composite damper in the application can effectively meet the application requirements of carbon flue, high-temperature industrial furnace and other systems under extreme thermal cycle conditions, and its excellent comprehensive performance, long-term applicability and universality are significantly better than those of traditional materials, effectively prolonging the service life of equipment and reducing maintenance costs. DETAILED DESCRIPTION

[0027] The application will be further described in detail below in combination with examples. The raw materials used in the application are commercially available common materials, except that some specifications are specifically limited.

[0028] Preparation Example 1

[0029] An iron-chromium-aluminum alloy framework with a brand of 0Cr25Al5, specifically a lattice-shaped steel square frame with a size of 600×600×10 mm, divided into 3600 units, each unit being 10×10×10 mm.

[0030] Preparation Example 2

[0031] An iron-chromium-aluminum alloy framework with a brand of 0Cr25Al5, specifically a lattice-shaped steel square frame with a size of 600×600×10 mm, divided into 3600 units, each unit being 10×10×10 mm.

[0032] The pre-oxidation treatment condition is heating at 900℃ for 1 hour in an air atmosphere.

[0033] Preparation Example 3

[0034] An iron-chromium-aluminum alloy framework with a brand of 0Cr25Al5, specifically a lattice-shaped steel square frame with a size of 600×600×10 mm, divided into 36 units, each unit being 100×100×10 mm.

[0035] The pre-oxidation treatment condition is heating at 700℃ for 2 hours in an air atmosphere.

[0036] Preparation Examples 4-8

[0037] A ceramic matrix composed of the following components by weight percentage (per 100 kg):

[0038] Table: Each component in Preparation Examples 4-8 and its weight (kg)

[0039] Preparation Example Ingredient 4 5 6 7 8 Polycrystalline alumina fiber 80 80 80 85 90 Y2O3 stabilizer 1 2 3 2 1 Nanometer zirconium oxide particles 3 4 5 4 3 Aqueous solution of acid aluminum phosphate 16 14 12 9 6

[0040] wherein the polycrystalline alumina fibers are a-Al203 having an Al203 content of > 99.5%, a fiber diameter of 7-12 μm, and the aqueous solution of acid aluminum phosphate is an aluminum dihydrogen phosphate solution having a concentration of 50%.

[0041] Performance test

[0042] The gate plate prepared in the examples was selected as the test object, and then its high-temperature durability, thermal shock resistance, thermal conductivity and interfacial bonding strength were tested, and the specific test methods and conditions are as follows:

[0043] 1) High-temperature durability test: place the gate plate to be tested in a 1200°C furnace for 1000 hours, observe the structural integrity, and record;

[0044] 2) Thermal shock resistance test: cycle the gate plate to be tested between 1200°C and room temperature for 100 times, and record the cracking and peeling of the gate plate;

[0045] 3) Thermal conductivity test: measure the thermal diffusivity from room temperature to 1200°C by laser flash method;

[0046] 4) Interfacial bonding strength: measure the metal-ceramic interfacial strength by shear test.

[0047] Example

[0048] Example 1

[0049] A heat-resistant ceramic fiber composite gate plate is prepared by the following preparation steps:

[0050] a) The pre-oxidized iron-chromium-aluminum alloy framework is prepared by Preparation Example 1;

[0051] b) The ceramic matrix obtained in Preparation Example 4 is mixed uniformly;

[0052] c) Pour the ceramic matrix obtained in b) into the alloy framework in a) according to a weight ratio of 1:3, and after shaping, perform medium-temperature solidification sintering at 800°C for 4h, to obtain the heat-resistant ceramic fiber composite gate plate.

[0053] Example 2

[0054] A heat-resistant ceramic fiber composite gate plate, which is different from Example 1, is prepared by the following preparation steps:

[0055] a) The pre-oxidized iron-chromium-aluminum alloy framework is prepared by Preparation Example 2;

[0056] b) The ceramic matrix obtained in Preparation Example 4 is mixed uniformly;

[0057] c) The ceramic matrix obtained in b) is poured into the alloy skeleton in a) at a weight ratio of 1:3, and after shaping, it is subjected to medium-temperature solidification sintering at 800°C for 4h to obtain the heat-resistant ceramic fiber composite brake pad.

[0058] Example 3

[0059] A heat-resistant ceramic fiber composite brake pad is prepared by using the following preparation steps, which is different from Example 1:

[0060] a) The pre-oxidized iron-chromium-aluminum alloy skeleton is prepared by Preparation Example 3;

[0061] b) The ceramic matrix obtained in Preparation Example 4 is uniformly mixed;

[0062] c) The ceramic matrix obtained in b) is poured into the alloy skeleton in a) at a weight ratio of 1:3, and after shaping, it is subjected to medium-temperature solidification sintering at 800°C for 4h to obtain the heat-resistant ceramic fiber composite brake pad.

[0063] Example 4

[0064] A heat-resistant ceramic fiber composite brake pad is prepared by using the following preparation steps, which is different from Example 1:

[0065] a) The pre-oxidized iron-chromium-aluminum alloy skeleton is prepared by Preparation Example 1;

[0066] b) The ceramic matrix obtained in Preparation Example 5 is uniformly mixed;

[0067] c) The ceramic matrix obtained in b) is poured into the alloy skeleton in a) at a weight ratio of 1:3, and after shaping, it is subjected to medium-temperature solidification sintering at 800°C for 4h to obtain the heat-resistant ceramic fiber composite brake pad.

[0068] Example 5

[0069] A heat-resistant ceramic fiber composite brake pad is prepared by using the following preparation steps, which is different from Example 1:

[0070] a) The pre-oxidized iron-chromium-aluminum alloy skeleton is prepared by Preparation Example 1;

[0071] b) The ceramic matrix obtained in Preparation Example 6 is uniformly mixed;

[0072] c) The ceramic matrix obtained in b) is poured into the alloy skeleton in a) at a weight ratio of 1:3, and after shaping, it is subjected to medium-temperature solidification sintering at 800°C for 4h to obtain the heat-resistant ceramic fiber composite brake pad.

[0073] Example 6

[0074] A heat-resistant ceramic fiber composite brake pad is prepared by using the following preparation steps, which is different from Example 1:

[0075] a) The pre-oxidized iron-chromium-aluminum alloy skeleton was prepared according to Preparation Example 1;

[0076] b) The ceramic matrix obtained in Preparation Example 7 was mixed evenly;

[0077] c) The ceramic matrix obtained in b) was poured into the alloy skeleton in a) at a weight ratio of 1:3, and after shaping, intermediate temperature solidification sintering was performed at 800°C for 4h to obtain the heat-resistant ceramic fiber composite gate plate.

[0078] Example 7

[0079] A heat-resistant ceramic fiber composite gate plate was prepared using the following preparation steps, which is different from Example 1:

[0080] a) The pre-oxidized iron-chromium-aluminum alloy skeleton was prepared according to Preparation Example 1;

[0081] b) The ceramic matrix obtained in Preparation Example 8 was mixed evenly;

[0082] c) The ceramic matrix obtained in b) was poured into the alloy skeleton in a) at a weight ratio of 1:3, and after shaping, intermediate temperature solidification sintering was performed at 800°C for 4h to obtain the heat-resistant ceramic fiber composite gate plate.

[0083] Comparative Example 1

[0084] A heat-resistant ceramic fiber composite gate plate was prepared, which is different from Example 1 in that:

[0085] The ceramic matrix was replaced by an equal amount of zirconium-containing ceramic fiber, and an additional 5% of HC-1601 binder was added, which was purchased from Huachuan, and other conditions were the same.

[0086] Comparative Example 2

[0087] A heat-resistant ceramic fiber composite gate plate was prepared, which is different from Example 1 in that the iron-chromium-aluminum alloy skeleton was not pre-oxidized, and other conditions were the same.

[0088] The heat-resistant ceramic fiber composite gate plates prepared in Examples 1-7 and Comparative Examples 1-2 above were extracted as test objects, and then their high temperature durability, thermal shock resistance, thermal conductivity and interfacial bonding strength were tested, and the test results are recorded in the following table.

[0089] Table: Performance test results of Examples 1-7 and Comparative Examples 1-2

[0090] Test item group High temperature durability 1000 h State after thermal shock cycle Thermal conductivity W / m-K Interfacial bond strength MPa Example 1 No cracks or peeling Intact 1.8 12.5 Example 2 No cracks or peeling Intact 1.8 12.7 Example 3 No cracks or peeling Intact 1.9 13.0 Example 4 No cracks or peeling Intact 2.1 12.5 Example 5 No cracks or peeling Intact 2.4 12.5 Example 6 No cracks or peeling Intact 2.2 12.2 Example 7 No cracks or peeling Intact 2.0 12.0 Comparative Example 1 Slight cracks Edge peeling 1.6 9.2 Comparative Example 2 Slight cracks Edge peeling 1.8 10.1

[0091] As can be seen from the above table, the heat-resistant ceramic fiber composite damper prepared in Examples 1-5 all have excellent high-temperature structural stability, thermal shock resistance and temperature uniformity, are suitable for high-temperature industrial environments above 1200℃, and have significantly improved performance compared to Comparative Examples 1-2, as follows:

[0092] In terms of high-temperature durability: no cracks or peeling at 1000h;

[0093] After thermal shock cycling, the state is basically intact, and there are no defects such as peeling and cracking;

[0094] The thermal conductivity is as high as 1.8-2.4 W / m·K, which is about 0-11% higher than that of Comparative Examples 1-2, indicating that it has excellent heat dissipation and high-temperature resistance;

[0095] The interfacial bonding strength is as high as 12.2-13.0 MPa, which is about 21-40% higher than that of Comparative Examples 1-2, indicating that it has excellent bonding ability and is not prone to defects caused by the mismatch of thermal expansion coefficients and the "cold core" effect of the combination of metal and ceramic.

[0096] In summary, combined with the various data, it can be concluded that it has the following advantages:

[0097] 1) Excellent high-temperature structural stability:

[0098] High-purity polycrystalline alumina fibers and pre-oxidized alloy skeletons can withstand temperatures above 1200℃ for a long time without softening or melting, and the addition of nano-zirconia, Y2O3 and acid aluminum phosphate solution further stabilizes the high-temperature phase composition of the ceramic matrix.

[0099] 2) Excellent thermal shock resistance (thermal shock stability):

[0100] This is one of the most prominent advantages of the present application. When the damper is rapidly cooled and heated, a large amount of thermal stress is generated inside. The metal skeleton of the present application has good plasticity and thermal conductivity, which can buffer part of the thermal stress. In addition, the multi-scale toughening mechanism (fiber toughening, phase change toughening) in the ceramic matrix can effectively inhibit the propagation of micro-cracks caused by thermal stress, preventing sudden brittle fracture of the material. That is, the metal and ceramic interface is firmly bonded, avoiding cracking at the interface due to the difference in thermal expansion coefficient.

[0101] 3) Significantly improved temperature uniformity:

[0102] The composite damper made by pre-oxidizing the iron-chromium-aluminum alloy skeleton and filling the ceramic matrix in the skeleton and sintering at 800-1000℃ has good heat insulation performance, which can reduce the heat loss inside the furnace, make the temperature field distribution of the damper itself and the area more uniform, reduce the damage caused by local overheating, and is conducive to process stability and energy saving.

[0103] 4)Long service life:

[0104] The combination of all the above advantages (high temperature stability, thermal shock resistance, corrosion resistance, temperature uniformity) is that the rate of crack initiation and propagation of the damper under harsh high-temperature cyclic operating conditions is greatly reduced, and the risk of spalling and cracking is significantly reduced, thus the service life of the damper is significantly improved compared to traditional refractory damper or pure ceramic damper, and the operating efficiency and economic benefit of the industrial furnace are improved.

[0105] The possible reasons for further deducing the data are as follows:

[0106] The core principle of the heat-resistant ceramic fiber composite damper is "harmony of hardness and softness" and "multiscale synergistic toughening". Through the combination of metal skeleton and ceramic matrix, the problems of brittleness, poor thermal shock stability and insufficient overall strength of traditional refractory materials at high temperature are ingeniously solved, which are as follows:

[0107] 1)"Rebar" effect — pre-oxidized iron-chromium-aluminum alloy skeleton:

[0108] Mechanical support: The network, porous or corrugated structure provides macro-scale skeleton support for the entire damper, giving the material excellent overall mechanical strength and deformation resistance, overcoming the shortcomings of pure ceramic materials such as brittleness and easy breakage.

[0109] Key of pre-oxidation: Pre-oxidation of 0Cr25Al5 alloy in air at 700-900℃ is to pre-form a dense and firm Cr2O3 and Al2O3 mixed oxide film on its surface. This film has two important functions:

[0110] Prevent high-temperature continuous oxidation: Prevent oxygen from continuing to erode the inside of the alloy in subsequent high-temperature use, greatly extending the service life of the skeleton itself.

[0111] Improve interface bonding: The oxide film and the ceramic matrix are both oxides, with better chemical compatibility, which can significantly improve the interfacial bonding strength between the metal skeleton and the ceramic matrix, preventing interfacial peeling due to the difference in thermal expansion coefficient during thermal cycling.

[0112] 2)"Concrete" effect — multifunctional ceramic matrix:

[0113] Main high-temperature structure: Polycrystalline alumina fiber (α-Al2O3, ≥99.5%) is the main body of the matrix, which itself has a very high melting point (>2000℃), providing high-temperature structural stability and corrosion resistance of the matrix above 1200℃.

[0114] Micro-nano scale toughening:

[0115] Polycrystalline alumina fibers form a three-dimensional network in the matrix, playing the role of micron-scale fiber pull-out, bridging and deflecting cracks, consuming fracture energy, and greatly improving the fracture toughness of the material.

[0116] The added nano zirconium oxide (Zr02) particles are the core technology. When the material is stressed, Zr02 will undergo a martensitic phase change (from tetragonal to monoclinic phase), which will be accompanied by a volume expansion of about 3-5%, generating a compressive stress on the surrounding microcracks, effectively inhibiting the propagation of cracks.

[0117] Stabilization treatment: Y203 as a stabilizer can stabilize the high-temperature tetragonal phase of zirconia to room temperature, ensuring that nano zirconia particles can undergo phase change when needed during service, thereby playing a toughening effect, rather than spontaneous rupture.

[0118] Low-temperature sintering and bonding: Acid aluminum phosphate water-based solution (aluminum dihydrogen phosphate) as an inorganic binder will dehydrate and condense during the medium-temperature (800-1000℃) solidification and sintering process, forming an AlPO4 glass phase with good bonding strength. It realizes the solidification of ceramic components at relatively low temperature, avoids the problem of fiber damage and high energy consumption caused by high-temperature sintering, and also has certain heat resistance.

[0119] 3) Synergistic effect principle:

[0120] The combination of metal skeleton (macroscopic toughness) and ceramic matrix (micro-nano scale toughness) makes the stress effectively dispersed and absorbed from macro to micro levels when the material is subjected to thermal stress or mechanical stress. The specific analysis is as follows:

[0121] Macroscopic stress is borne by the tough metal skeleton; microcracks are effectively prevented by alumina fibers and phase-change zirconia particles when they expand to the ceramic matrix; good interface bonding between metal and ceramic ensures that stress can be effectively transmitted between them.

[0122] Example 8

[0123] A heat-resistant ceramic fiber composite brake plate, the difference from example 1 is that it is prepared by the following preparation steps:

[0124] a) The pre-oxidized iron-chromium-aluminum alloy skeleton is prepared from preparation example 1;

[0125] b) The ceramic matrix obtained in preparation example 4 is mixed uniformly;

[0126] c) Pour the ceramic matrix obtained in b) into the alloy skeleton in a) according to the weight ratio of 1:4, and after shaping, perform medium-temperature solidification and sintering at 800℃ for 4h, to obtain the heat-resistant ceramic fiber composite brake plate.

[0127] Example 9

[0128] A heat-resistant ceramic fiber composite brake panel was prepared by the following steps, which is different from Example 1:

[0129] a) The pre-oxidized iron-chromium-aluminum alloy framework was prepared by Preparation Example 1;

[0130] b) The ceramic matrix obtained in Preparation Example 4 was uniformly mixed;

[0131] c) The ceramic matrix obtained in b) was poured into the alloy framework in a) according to a weight ratio of 1:5, after shaping, it was subjected to medium-temperature solidification sintering at 800°C for 4h, and a heat-resistant ceramic fiber composite brake panel was obtained.

[0132] Example 10

[0133] A heat-resistant ceramic fiber composite brake panel was prepared by the following steps, which is different from Example 1:

[0134] a) The pre-oxidized iron-chromium-aluminum alloy framework was prepared by Preparation Example 1;

[0135] b) The ceramic matrix obtained in Preparation Example 4 was uniformly mixed;

[0136] c) The ceramic matrix obtained in b) was poured into the alloy framework in a) according to a weight ratio of 1:1, after shaping, it was subjected to medium-temperature solidification sintering at 800°C for 4h, and a heat-resistant ceramic fiber composite brake panel was obtained.

[0137] The heat-resistant ceramic fiber composite brake panels prepared in Examples 8-10 above were extracted as test objects, and then their high-temperature durability, thermal shock resistance, thermal conductivity and interfacial bonding strength were tested respectively, and the test results are recorded in the following table.

[0138] Table: Performance test results of Examples 8-10

[0139] Test item group High temperature durability 1000 h State after thermal shock cycle Thermal conductivity W / m-K Interfacial bond strength MPa Example 8 No cracks or peeling Intact 1.9 12.5 Example 9 No cracks or peeling Intact 2.0 12.3 Example 10 No cracks or peeling Intact 1.8 11.1

[0140] As can be seen from the above table, the heat-resistant ceramic fiber composite brake panels prepared in Examples 8-10 still have excellent high-temperature structural stability, thermal shock resistance and temperature uniformity, and are suitable for high-temperature industrial environments above 1200°C. Compared with Example 1, their performance has changed to varying degrees, as follows:

[0141] In terms of high-temperature durability: no cracks or peeling after 1000h;

[0142] After thermal shock cycle, the state is basically intact, and there is no peeling, cracking and other defects;

[0143] The thermal conductivity is as high as 1.8-2.0 W / m·K, which has no obvious change compared with example 1, but based on the basic principle, it can be known that to a certain extent, the higher the amount of ceramic matrix, the higher the thermal conductivity, but too high amount will affect the interface bonding strength;

[0144] The interface bonding strength is as high as 11.1-12.5 MPa, which has no obvious fluctuation compared with example 1, still has excellent bonding capacity, it can be seen that the preferred weight ratio of pre-oxidized iron-chromium-aluminum alloy skeleton and ceramic matrix is 1:(3-5), and there is no obvious performance fluctuation in this range.

[0145] It should be particularly pointed out that the heat-resistant ceramic fiber composite brake plate in the present application is only taken as an example of typical example 1, and within the preferred range, those skilled in the art can adjust the operating temperature and other conditions according to the actual operation, and the changes in various performances can be expected, so it is not repeated here.

[0146] The above are modifications or obvious technical inspirations without creative contribution to the present embodiment which can be made by those skilled in the art after reading the present specification according to the needs, but as long as it is within the scope of the claims of the present application, it should be protected by the patent law.

Claims

1. A heat resistant ceramic fiber composite shutter, characterized by, The heat-resistant ceramic fiber composite gate plate is made of a pre-oxidized iron-chromium-aluminum alloy framework and a ceramic matrix filled in the framework and sintered at 800-1000 ℃. The iron-chromium-aluminum alloy framework is in a lattice, porous or corrugated structure. The ceramic matrix is composed of polycrystalline alumina fibers, Y2O3 stabilizer, nano zirconia particles and an aqueous solution of acid aluminum phosphate.

2. The heat-resistant ceramic fiber composite shutter according to claim 1, wherein, The weight ratio of the pre-oxidized iron-chromium-aluminum alloy framework to the ceramic matrix is 1:(3-5).

3. The heat-resistant ceramic fiber composite shutter door of claim 2, wherein, The grade of the iron-chromium-aluminum alloy framework is 0Cr25Al5. The pre-oxidation treatment conditions are as follows: heating at 700-900 ℃ for 1-2 hours in an air atmosphere.

4. The heat-resistant ceramic fiber composite shutter door of claim 2, wherein, The ceramic matrix is composed of the following components by weight percentage: polycrystalline alumina fibers 80-90 wt%, Y2O3 stabilizer 1-3 wt%, nano zirconia particles 3-5 wt%, and an aqueous solution of acid aluminum phosphate as the balance.

5. The heat-resistant ceramic fiber composite shutter door of claim 3, wherein, The polycrystalline alumina fibers are α-Al2O3 with Al2O3 content ≧99.5%, and the fiber diameter is 7-12 μm.

6. The heat-resistant ceramic fiber composite shutter door of claim 3, wherein, The aqueous solution of acid aluminum phosphate is an aluminum dihydrogen phosphate solution with a concentration of 30-50%.

7. The method of making the heat resistant ceramic fiber composite brake pad of any one of claims 1-6, characterized in that, The method comprises the following steps: a) pre-oxidizing the iron-chromium-aluminum alloy framework; b) mixing polycrystalline alumina fibers, Y2O3 stabilizer, nano zirconia particles and an aqueous solution of acid aluminum phosphate according to the corresponding weight ratio to prepare a ceramic slurry; c) pouring the ceramic slurry obtained in b) into the alloy framework in a), shaping, and then sintering at 800-1000 ℃ for 2-4 h to obtain the heat-resistant ceramic fiber composite gate plate.

8. The heat resistant ceramic fiber composite damper according to any one of claims 1 to 5, or use of the heat resistant ceramic fiber composite damper according to claim 7 in a carbon flue damper or high temperature industrial furnace system, characterized in that, Long-acting and suitable for high-temperature industrial environments above 1200 ℃.