A low-cost, high-efficiency alumina fiber-reinforced alumina composite material preparation method

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

Active Publication Date: 2022-07-01
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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  • A low-cost, high-efficiency alumina fiber-reinforced alumina composite material preparation method
  • A low-cost, high-efficiency alumina fiber-reinforced alumina composite material preparation method
  • A low-cost, high-efficiency alumina fiber-reinforced alumina composite material preparation method

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Embodiment 1

[0028] A preparation method of low-cost, high-efficiency alumina fiber-reinforced alumina composite material, which specifically comprises 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 2h 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) The alumina fiber cloth is cut into specifications, placed in a muffle furnace, heated to 600 °C in an air atmosphere, kept for 2 hours, and taken out with the furnace cooled to room temperature;

[0031] (3) Lay out the alumina fiber cloth obtained in step (2) in the mold, apply the alumina slurry obtained in step (1) on the surface of each layer of alumina fiber...

Embodiment 2

[0044] The present embodiment provides a low-cost, high-efficiency preparation method of alumina fiber-reinforced alumina composite material, 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 h 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) The alumina fiber cloth is cut into specifications, placed in a muffle furnace, heated to 650°C in an air atmosphere, kept for 2 hours, and taken out with the furnace cooled to room temperature;

[0047] (3) Lay out the alumina fiber cloth obtained in step (2) in the mold, apply the alumina slurry obtained in step (1) on the surf...

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Abstract

The invention relates to the technical field of preparation of continuous fiber-reinforced ceramic matrix composite materials, and specifically discloses a low-cost and high-efficiency preparation method of alumina fiber-reinforced alumina composite materials. The specific steps of the method are as follows: firstly, a stable alumina slurry is prepared, then the alumina slurry is brushed on the degummed alumina fiber cloth, molded after molding, and dried to obtain alumina fiber reinforced alumina The composite material blank is finally sintered to obtain an alumina fiber reinforced alumina composite material. The preparation method provided by the invention has the characteristics of simple process and short preparation period, and the prepared alumina fiber reinforced alumina composite material has excellent high temperature mechanical properties and thermal stability properties.

Description

technical field [0001] The invention belongs to the technical field of preparation of continuous fiber-reinforced ceramic matrix composite materials, and particularly relates 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 largel...

Claims

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Application Information

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Patent Type & Authority Patents(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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