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Preparation method of low-cost and high-efficiency aluminum oxide fiber reinforced aluminum oxide composite material

A technology of alumina fiber and composite materials, which is applied in the field of preparation of low-cost and high-efficiency alumina fiber-reinforced alumina composite materials, which can solve the problems of unfavorable mechanical properties of composite materials, aggravation of alumina fibers, and long preparation cycle, etc., to achieve excellent High-temperature mechanical properties and thermal stability, reduced thermal damage, and short preparation cycle

Active Publication Date: 2019-12-20
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The two alumina fiber reinforced oxide composites disclosed above have excellent mechanical properties at room temperature, but there are still the following deficiencies: 1) the organic precursor solution is introduced into the matrix during the preparation process, and the organic precursor solution is dried and dried. The process of high temperature heat treatment is faced with complex chemical process, which is easy to cause damage to the fiber; 2) The preparation cycle is long, and repeated impregnation-high temperature heat treatment is easy to aggravate the thermal damage of alumina fiber, which is not conducive to further improving the mechanical properties of composite materials

Method used

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  • Preparation method of low-cost and high-efficiency aluminum oxide fiber reinforced aluminum oxide composite material
  • Preparation method of low-cost and high-efficiency aluminum oxide fiber reinforced aluminum oxide composite material
  • Preparation method of low-cost and high-efficiency aluminum oxide fiber reinforced aluminum oxide composite material

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Embodiment 1

[0028] A low-cost, high-efficiency alumina fiber-reinforced alumina composite material preparation method, specifically comprising the following steps:

[0029] (1) Disperse the alumina powder with an average particle size of 0.2 μm into deionized water, add nitric acid to adjust the viscosity and Zeta potential value of the slurry, and perform ball milling: the ball milling speed is 400 rpm, and the ball milling time is 2 hours to obtain alumina Slurry, the solid content of alumina powder in the alumina slurry is 55vol%, the viscosity of the alumina slurry is 150mPa·s, and the Zeta potential is 70mV;

[0030] (2) Cut the alumina fiber cloth into the specified size, place it in the muffle furnace, raise the temperature to 600°C in the air atmosphere, keep it warm for 2 hours, and take it out after cooling to room temperature with the furnace;

[0031] (3) lay out the alumina fiber cloth that step (2) obtains in the mould, brush the alumina slurry that step (1) obtains on the s...

Embodiment 2

[0044] This embodiment provides a low-cost, high-efficiency alumina fiber-reinforced alumina composite material preparation method, which specifically includes the following steps:

[0045] (1) Disperse the alumina powder with an average particle size of 0.2 μm into deionized water, add ammonia water to adjust the viscosity and Zeta potential value of the slurry, and perform ball milling: the ball milling speed is 400 rpm, and the ball milling time is 4 hours to obtain alumina Slurry, the solid content of alumina powder in the alumina slurry is 60vol%, the viscosity of the alumina slurry is 350mPa·s, and the Zeta potential is -38mV;

[0046] (2) Cut the alumina fiber cloth into the specified size, place it in the muffle furnace, raise the temperature to 650°C in the air atmosphere, keep it warm for 2 hours, and take it out after cooling to room temperature with the furnace;

[0047] (3) lay out the alumina fiber cloth that step (2) obtains in the mould, brush the alumina slurr...

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Abstract

The invention belongs to the technical field of preparation of continuous fiber reinforced ceramic based composite materials, and particularly discloses a preparation method of a low-cost and high-efficiency aluminum oxide fiber reinforced aluminum oxide composite material. The method comprises the following specific steps: firstly, preparing a stable aluminum oxide slurry, then brushing the aluminum oxide slurry on degummed aluminum oxide fiber cloth, molding after mould pressing, drying to obtain an aluminum oxide fiber reinforced aluminum oxide composite material rough blank, and finally, sintering to obtain the aluminum oxide fiber reinforced aluminum oxide composite material. The preparation method provided by the invention has the characteristics of simple process and short preparation period, and the prepared aluminum oxide fiber reinforced aluminum oxide composite material has excellent high-temperature mechanical properties and thermal stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of continuous fiber-reinforced ceramic matrix composite materials, in particular to a preparation method of low-cost and high-efficiency alumina fiber-reinforced alumina composite materials. Background technique [0002] Continuous alumina fiber reinforced alumina composites (Al 2 o 3 / Al 2 o 3 Composite material) has excellent properties such as high temperature resistance, oxidation resistance, high strength, high toughness, corrosion resistance and wear resistance, and is an important candidate material for high-temperature parts of equipment such as aero-engines in the future. However, limited by the mechanical properties of alumina fibers and the preparation level of composite materials, the current domestic Al 2 o 3 / Al 2 o 3 The mechanical properties of composites are generally lower than those of non-oxide composites, such as C / SiC and SiC / SiC composites, which largely limits th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/5224C04B2235/5256C04B2235/5445C04B2235/96
Inventor 刘海韬姜如黄文质
Owner NAT UNIV OF DEFENSE TECH
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