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Preparation method of continuous oxide fabric surface coating

A technology of surface coating and fiber fabric, which is applied in the field of preparation of continuous oxide fiber fabric surface coating, can solve the problem that the interface between pyrolytic carbon and BN cannot meet the requirements of anti-oxidation, long life and high reliability, and harsh service conditions, etc. problems, to achieve the effect of short preparation cycle, low equipment requirements and simple operation

Active Publication Date: 2016-01-27
AVIC BEIJING AERONAUTICAL MFG TECH RES INST +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] At present, the interface layer of fiber reinforced ceramic matrix composites mainly includes pyrolytic carbon interface layer and BN interface layer, but the interface layer of pyrolytic carbon and BN is mainly for non-oxide continuous fiber reinforced ceramic matrix composites, because oxide fiber reinforced oxide ceramics Matrix composite materials are mainly used in oxygen and gas environments, and the service conditions are relatively harsh. The interface between pyrolytic carbon and BN cannot meet the requirements of oxidation resistance, long life and high reliability in service environments.

Method used

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  • Preparation method of continuous oxide fabric surface coating

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preparation example Construction

[0027] (12) Preparation of coating phase precursor

[0028] Prepare the coating precursor solution by stirring and mixing the solution. The precursor solution is one or more of the following mixed solutions, mixed solution of nitrate and phytic acid, mixed solution of nitrate and phosphoric acid, mixed solution of citric acid, nitrate and dihydrogen phosphate Ammonium mixed solution, the concentration of nitrate in the coating precursor solution is 30-80%;

[0029] (13) Continuous oxide fiber preform impregnation process

[0030] Immerse the pretreated continuous oxide fiber preform in the above precursor solution for 10-20s, take it out, put it in deionized water at 50-100°C, and keep stirring for 5-15min, rinse the fiber cloth with deionized water after taking it out surface to remove ions in solution and loose solids on the surface;

[0031] (14) Coating drying and heat treatment process

[0032] The fiber preform impregnated with the precursor solution is put into an ov...

Embodiment 1

[0036] Put the 610 alumina fiber fabric of 3M company in a muffle furnace for heat treatment at 800°C for 1 hour, and remove the surface sizing agent before use.

[0037] Lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) and phytic acid (pc) are stirred and mixed in a deionized medium to configure a precursor solution, wherein the concentration of lanthanum nitrate is 50%. Then, immerse the alumina fiber fabric in the precursor solution for 15 seconds, take it out, put it in deionized water at 90°C, and keep stirring for 5 minutes, so that LaPO4 is deposited on the surface of the fiber cloth, and rinse the coated surface with deionized water after taking it out. 20s on the surface of the fiber cloth to remove ions in the solution and loose solids on the surface. Then arrange the fibers in an oven and dry at 120°C for 15 minutes, then put them into a muffle furnace, heat-treat at 800°C for 5 minutes, and take them out directly, so that the impregnation-heat treatment cycle is repeated...

Embodiment 2

[0039] After soaking the mullite fiber fabric produced by Mitsubishi Corporation in acetone for 30 minutes, place it in a muffle furnace for heat treatment at 500°C for 2 hours, remove the surface sizing agent, and set it aside for use.

[0040] Neodymium nitrate (Nd(NO 3 ) 3 ·6H 2 O) and ammonium dihydrogen phosphate (ADPH) are magnetically stirred and mixed in a deionized medium to configure a precursor solution, wherein the concentration of lanthanum nitrate is 60%. Then, the alumina fiber fabric was immersed in the precursor solution for 10 seconds, then taken out, put into 80°C deionized water, and stirred continuously for 8 minutes to make the NdPO 4 After depositing on the surface of the fiber cloth, rinse the surface of the fiber cloth containing the coating with deionized water for 15s after taking it out to remove ions in the solution and loose solids on the surface. Then arrange the fibers in an oven and dry at 100°C for 20 minutes, then put them into a muffle fu...

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Abstract

The invention belongs to the preparation technology of continuous fiber enhanced ceramic base composite materials, and relates to a preparation method of a coating interface between fiber and a base body in the continuous oxide fiber enhanced oxide ceramic base composite material. The method includes the steps of preparing a coating phase phosphate precursor solution, soaking an oxide fiber prefabricated part in the precursor solution, taking out the prefabricated part after soaking, conducting desizing on the prefabricated part at an appropriate temperature, and obtaining a phosphate coating on the fiber surface through a repeated soaking and thermal processing process. The coating can protect fiber against mechanical and heat damage in the base body densification process and provide an appropriate weak interface combination for fiber and the base body, thereby improving strength and toughness of the material. In addition, the phosphate coating has the advantage of high temperature oxidation resistance, thereby greatly prolonging the service life of the composite material and improving high temperature reliability.

Description

technical field [0001] The invention belongs to the preparation technology of continuous fiber reinforced ceramic matrix composite material, and relates to a preparation method of continuous oxide fiber fabric surface coating. Background technique [0002] Continuous fiber-reinforced composite materials have the characteristics of low density, high specific strength, high specific modulus, high temperature resistance, oxidation resistance, and good reliability. They are the development direction of high-performance aero-engine materials. Among them, ceramic matrix composite (CMC) is a kind of high temperature (1650 ℃) and low density (2.5g / cm 3 ~3.3g / cm 3 ), which is expected to replace the density greater than 8.0g / cm 3 High-quality nickel-based or single-crystal nickel alloys are used as engine combustion chambers, flame stabilizers, inner cones, tail nozzles, worm wheel outer rings, high-pressure turbines, low-pressure turbines and other components. with SiC that has b...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/447
Inventor 梁艳媛焦健王岭杨金华刘善华张冰玉
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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