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Sapphire fiber-reinforced ceramic-matrix multi-phase composite as well as preparation method and application thereof

A sapphire and fiber technology, applied in the direction of combustion method, metal material coating process, combustion equipment, etc., can solve the problems of low density, limited application, high room temperature brittleness, etc., achieve good interface compatibility and wettability, and promote Diffusion and grain refinement, the effect of reducing interface and crystal plane defects

Active Publication Date: 2017-07-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, A1 2 o 3 Ceramics are inherently brittle and basically cannot be used alone. In most cases, they appear in the form of composite materials, and because Al 2 o 3 The material has a very high melting point, and it is difficult to prepare Al by traditional composite material preparation methods such as direct sintering and melt infiltration. 2 o 3 Fiber reinforced Al 2 o 3 ceramic matrix composites
Fe-Al intermetallic compounds have good development prospects as a new generation of structural materials due to their high temperature resistance, wear resistance, high temperature oxidation resistance, good high temperature hardness and abnormal heat strength, low density and low cost. -Al intermetallic compound materials also have defects such as high room temperature brittleness and low high-temperature environment strength, which seriously limit their application in high-temperature structural materials

Method used

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  • Sapphire fiber-reinforced ceramic-matrix multi-phase composite as well as preparation method and application thereof
  • Sapphire fiber-reinforced ceramic-matrix multi-phase composite as well as preparation method and application thereof
  • Sapphire fiber-reinforced ceramic-matrix multi-phase composite as well as preparation method and application thereof

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preparation example Construction

[0024] Such as figure 1 As shown, the invention provides a kind of preparation method of three-phase composite ceramic material, comprises the steps:

[0025] S1: Mix the first component with a dispersant, perform ball milling under the protection of argon, and then dry the ball-milled mixture; wherein, the first component includes iron oxide powder, aluminum powder and aluminum oxide powder.

[0026] Preferably, in the first component: the mass fraction of iron oxide powder is 14% to 27%, the mass fraction of aluminum powder is 7% to 13%, and the mass fraction of aluminum oxide powder is 60% to 79%; the first group The mass ratio of the dispersant and the dispersant is 1: (0.6~1.2); the dispersant is a mixed solution of polyethylene glycol and ethanol or a mixed solution of methyl amyl alcohol and ethanol; in the mixed solution of polyethylene glycol and ethanol, The mass fraction of polyethylene glycol is 3% to 5%; in the mixed solution of methyl amyl alcohol and ethanol, t...

Embodiment 1

[0035] Weigh 56g of Fe with a diameter of 23-140μm 2 o 3 Powder, 29.7g Al powder with a diameter of 8-76μm, 214.2g Al powder with a diameter of 17-126μm 2 o 3 Powder, whose mass fractions are 18.7%, 10.0% and 71.3%, respectively, take the Al with a diameter of 8mm 2 o 3 1.8 kg of grinding balls, take 300 g of a mixed solution of polyethylene glycol (PEG-600) and ethanol, wherein the mass fraction of polyethylene glycol (PEG-600) is 3%. After mixing all the above materials, under the protection of argon, ball mill at a speed of 200r / min for 20h, and the mixture obtained by ball milling was vacuum dried at 45°C for 12h to obtain a dried product.

[0036] The 0° sapphire fiber non-weft fabric treated with steam, the sapphire fiber mesh tire formed by the air-laid machine and the 90° sapphire fiber non-weft fabric are stacked in sequence until the thickness reaches 4mm, and then three-dimensional needle punching is used. forming, the needling density is 36 needles / square cent...

Embodiment 2

[0041] Weigh 72g of Fe with a diameter of 23-140μm 2 o 3 Powder, 35.1g Al powder with a diameter of 8-76μm, 260.0g Al powder with a diameter of 17-126μm 2 o 3 Powder, whose mass fractions are 19.6%, 9.6% and 70.8%, respectively, take the Al with a diameter of 10mm 2 o 3 2.2 kg of grinding balls, take 294 g of a mixed solution of polyethylene glycol (PEG-600) and ethanol, wherein the mass fraction of polyethylene glycol (PEG-600) is 5%. After mixing all the above materials, under the protection of argon, ball milled at a speed of 200r / min for 16h, and the mixture obtained by ball milling was vacuum dried at 45°C for 12h to obtain a dried product.

[0042]The 0° sapphire fiber non-weft fabric treated with steam, the sapphire fiber mesh tire formed by the air-laid machine and the 90° sapphire fiber non-weft fabric are stacked in sequence until the thickness reaches 4mm, and then three-dimensional needle punching method is used to form it. , the needling density is 25 needles...

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Abstract

The invention relates to a sapphire fiber-reinforced ceramic-matrix multi-phase composite as well as a preparation method and an application thereof. The preparation method comprises the steps as follows: a first component and a dispersing agent are mixed and are dried after being ball-milled under the protection of argon; the first component comprises iron oxide powder, aluminum powder and aluminum oxide powder; a dried product and a second component are evenly mixed, mixed powder is obtained, a sapphire fiber preform is arranged in the mixed powder, and hot-pressing sintering is performed under the vacuum condition; the second component comprises chromium powder; and a product obtained through hot-pressing sintering is pre-oxidized in the oxygen atmosphere, and the three-phase ceramic composite is obtained. With the three-phase ceramic composite, the mechanical strength of a heat shield prepared from the composite can be improved, the high-temperature resistance and the corrosion resistance of the heat shield can be improved, the service life can be prolonged, the thermal conductivity is reduced, and multi-cycle stable and reliable working can be realized at the high temperature of 1,900 K or above.

Description

technical field [0001] The invention relates to the technical field of heat shield preparation, in particular to a sapphire fiber-reinforced ceramic-based multiphase composite material and a preparation method and application thereof. Background technique [0002] In order to meet the needs of contemporary air combat and improve the survivability of fighter jets in the battlefield environment, military aircraft such as fighter attack aircraft and interceptors generally put forward higher technical requirements for maximum climb speed, acceleration performance, high-speed flight performance and maneuverability. , which usually requires adapting to a power plant with high temperature and high thrust-to-weight ratio, especially to increase the intake air temperature of the engine combustion chamber and the temperature of the core combustion zone. The heat shield is one of the important components that constitute the afterburner of an aero-engine, and it mainly plays the role of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/00C22C47/14C22C47/06C23C4/134C23C4/11F23R3/00C22C101/04
CPCC22C47/06C22C47/14C22C49/00F23R3/007
Inventor 罗瑞盈全华锋
Owner BEIHANG UNIV
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