A kind of preparation method of high temperature resistant reinforced toughened alumina fiber reinforced alumina matrix composite material

A technology of alumina fiber reinforcement and toughening, which is applied in the preparation of high temperature resistant reinforced and toughened alumina fiber reinforced alumina matrix composite materials and the preparation of high temperature resistant reinforced and toughened Ox/Ox composite materials, which can solve fiber debonding , pull out, incomplete sintering of the substrate, poor mechanical properties, etc., to achieve high strength and high hardness, uniform nanowire coating, and improved toughness

Active Publication Date: 2021-10-19
CENT SOUTH UNIV
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Problems solved by technology

[0004] Chinese invention patent CN201611216535.8 discloses a preparation method of continuous alumina fiber-reinforced alumina ceramic matrix composites. The densification process of the matrix adopts a freeze-drying process, which can not only obtain a high-density matrix, but also ensure that the interface layer is maintained before high-temperature heat treatment. Without cracking, the porous oxide coating is obtained, and a weak interface is formed between the fiber of the composite material and the matrix to achieve the effect of strengthening and toughening the composite material. However, the composite material does not improve the matrix, and the matrix prepared by low-temperature sintering does not dense, the matrix is ​​not completely sintered, and the mechanical properties are poor
Chinese invention patent CN201910715241.7 discloses a method for preparing alumina fiber-reinforced alumina ceramic matrix composites. During the sintering process, the carbon-containing coating is oxidized and decomposed to generate a gap interface layer between the fiber and the matrix, avoiding The damage of high temperature to the fiber performance is eliminated, and the alumina ceramic matrix composite is strengthened, but the interface layer forms pores after sintering, so that when the material is used in a high temperature oxidizing environment, the material is first damaged at the interface, and the pores will make it The fiber and the matrix form a weak interface, and the fiber debonding and pull-out phenomenon occurs during the loading process of the composite material

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  • A kind of preparation method of high temperature resistant reinforced toughened alumina fiber reinforced alumina matrix composite material
  • A kind of preparation method of high temperature resistant reinforced toughened alumina fiber reinforced alumina matrix composite material
  • A kind of preparation method of high temperature resistant reinforced toughened alumina fiber reinforced alumina matrix composite material

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preparation example Construction

[0044] The high-temperature-resistant reinforced and toughened Ox / Ox composite material provided in the present invention is a kind of high-temperature-resistant reinforced and toughened alumina fiber-reinforced alumina matrix composite material, and its preparation method specifically includes the following steps:

[0045] S1. Pretreatment of alumina fibers:

[0046] According to actual needs, place alumina fibers of required size in the pretreatment solution for vacuum impregnation, place the impregnated alumina fibers in a high-temperature furnace for heat treatment, and then repeat the above pretreatment solution impregnation-heat treatment for alumina fibers The process is to obtain an alumina fiber with a surface coating of 10-500 nm, and then perform a pretreatment solution immersion-heat treatment process.

[0047] S2. Preparation of composite nanowire coating:

[0048] Put the alumina fiber coated on the above surface into a vapor deposition furnace, deposit pyrolyti...

Embodiment 1

[0057] The two-dimensional plain weave alumina fiber is vacuum impregnated in a mixed solution of 30vol% ammonium dichromate and anhydrous oxalic acid, wherein the concentration of anhydrous oxalic acid in ammonium dichromate is 200g / mL, Immerse for 4 hours. After the impregnation is completed, the alumina fiber is heat-treated in a high-temperature furnace. The temperature of the heat treatment process is 300°C, and then the alumina fiber is placed in a mixed solution of 30vol% ammonium dichromate and anhydrous oxalic acid for vacuum impregnation. 4h, after the impregnation is completed, put it into a high-temperature furnace at 300°C for heat treatment to obtain alumina fibers with a surface coating of 10nm, and then repeat the mixed solution immersion-heat treatment process once. Wherein, the two-dimensional plain weave has 10-16 strands of warp yarn or weft yarn per 1 cm.

[0058] Put the above-mentioned 10nm-coated alumina fiber into a vapor deposition furnace (CVI), depo...

Embodiment 2

[0063] Vacuum-impregnate the alumina fibers of the three-dimensional stitched felt in a mixed solution of ammonium dichromate and anhydrous oxalic acid at a concentration of 50vol%, wherein the concentration of anhydrous oxalic acid in ammonium dichromate is 10g / mL, and the impregnation 2h, after the impregnation is completed, the alumina fiber is heat-treated in a high-temperature furnace at a temperature of 100°C, and then the above-mentioned mixed solution immersion-heat treatment process is repeated for the alumina fiber 4 times to obtain an alumina fiber with a surface coating of 500nm. The mixed solution immersion-heat treatment process was repeated once. Wherein, the warp yarn or weft yarn per 1 cm of the three-dimensional sewing felt is 4 to 20 strands.

[0064] Put the above-mentioned alumina fiber with a surface coating of 500nm into a vapor deposition furnace (CVI), deposit a 150nm BN pre-coating on the surface of the coating, and then use the electric pulse deposit...

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Abstract

The invention discloses a method for preparing a high-temperature-resistant reinforced and toughened Ox / Ox composite material, and relates to the technical field of ceramic-based composite materials. The present invention first adopts the mixed solution of ammonium dichromate and anhydrous oxalic acid to pre-treat the alumina fiber fabric by impregnation-heat treatment to obtain the surface-coated alumina fiber, and then put it into CVI to prepare pyrolytic carbon coating or BN coating. The nanowire coating is obtained by electrophoretic deposition on the coating, and then the alumina ceramic slurry is coated on the surface of the alumina fiber fabric with the nanowire coating for hot pressing and sintering to obtain a high-performance Ox / Ox composites. The invention provides a method for preparing a high-temperature-resistant reinforced and toughened Ox / Ox composite material, which obtains a high-density matrix and a porous nano-oxide coating, so that a weak interface is formed between the alumina fiber and the alumina matrix, thereby obtaining A high-strength, high-toughness, high-temperature-resistant alumina fiber-reinforced alumina matrix composite was developed.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and in particular relates to a method for preparing a high-temperature-resistant reinforced and toughened Ox / Ox composite material, that is, a method for preparing a high-temperature-resistant reinforced and toughened alumina fiber-reinforced alumina matrix composite material. Background technique [0002] Ceramic matrix composites are a type of composite material that is composited with ceramics and various fibers. The ceramic matrix can be high-temperature structural ceramics such as alumina, silicon nitride, and silicon carbide. At present, alumina is the most widely used and widely used. ceramic matrix composites. Ceramic matrix composites have been used as liquid rocket engine nozzles, missile radomes, space shuttle nose cones, aircraft brake discs and high-end automobile brake discs, etc., becoming an important branch of high-tech new materials. Alumina ceramics ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/80C04B35/622C04B35/628C04B38/06
CPCC04B35/117C04B35/622C04B35/62855C04B35/62868C04B35/62873C04B35/62884C04B35/62886C04B35/62894C04B38/0645C04B38/068C04B2235/3218C04B2235/3225C04B2235/3262C04B2235/3418C04B2235/3839C04B2235/386C04B2235/425C04B2235/5224C04B2235/5252C04B2235/5256C04B2235/5288C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/616C04B2235/656C04B2235/6567C04B2235/96C04B35/803
Inventor 阳海棠
Owner CENT SOUTH UNIV
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