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Aluminum silicate fiber reinforced oxide ceramic and preparation method thereof

A technology of aluminum silicate fiber and oxide ceramic, which is applied in the field of aluminum silicate fiber reinforced oxide ceramic and its preparation, can solve problems such as inability to form three-dimensional components, and achieve excellent oxidation resistance, high process efficiency and high specific strength Effect

Active Publication Date: 2015-09-23
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as reported in foreign literature, most of the processes they use are slurry impregnation-winding or hot pressing processes, which can only form one-dimensional or two-dimensional products, and cannot form three-dimensional components.

Method used

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  • Aluminum silicate fiber reinforced oxide ceramic and preparation method thereof
  • Aluminum silicate fiber reinforced oxide ceramic and preparation method thereof
  • Aluminum silicate fiber reinforced oxide ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] a kind of like figure 1The aluminum silicate fiber-reinforced mullite ceramics shown in the present invention use mullite as a ceramic matrix, and the reinforcing phase is aluminum silicate fibers.

[0038] A method for preparing the above-mentioned aluminum silicate fiber reinforced mullite ceramics, specifically comprising the following steps:

[0039] (1) Pretreatment of aluminum silicate fiber fabric: place the three-dimensional orthogonal aluminum silicate fiber fabric with a fiber volume fraction of 40% in a muffle furnace, and raise the temperature to 600°C in air at a rate of 10°C / min , keep warm for 1 hour, cool naturally to room temperature and take out;

[0040] (2) Primary densification of the matrix: first, using mullite sol as a precursor, vacuum impregnate the aluminum silicate fiber fabric obtained in step (1) for 6 hours, take it out and let it dry in the air for 2 hours; then, vacuum-impregnate the aluminum silicate fiber fabric Put the final aluminu...

Embodiment 2

[0048] An aluminum silicate fiber-reinforced alumina ceramic of the present invention uses alumina as a ceramic matrix, and the reinforcing phase is aluminum silicate fiber.

[0049] A method for preparing the above-mentioned aluminum silicate fiber reinforced alumina ceramics, specifically comprising the following steps:

[0050] (1) Pretreatment of aluminum silicate fiber fabric: the three-dimensional four-way aluminum silicate fiber fabric with a fiber volume fraction of 45% is placed in a muffle furnace, and the temperature rises to 550 °C in air at a rate of 8 °C / min , keep warm for 1.5h, cool down to room temperature naturally, take out for later use;

[0051] (2) Primary densification of the matrix: first, use alumina sol as a precursor, vacuum impregnate the aluminum silicate fiber fabric obtained in step (1) for 7 hours, take it out and let it dry in the air for 1.5 hours; then, vacuum-impregnate the aluminum silicate fiber fabric Put the final aluminum silicate fibe...

Embodiment 3

[0057] An aluminum silicate fiber-reinforced silica ceramic of the present invention uses silicon oxide as a ceramic matrix, and the reinforcing phase is aluminum silicate fiber.

[0058] A method for preparing the above-mentioned aluminum silicate fiber reinforced silica ceramics, specifically comprising the following steps:

[0059] (1) Pretreatment of aluminum silicate fiber fabric: the three-dimensional orthogonal aluminum silicate fiber fabric with a fiber volume fraction of 42% is placed in a muffle furnace, and the temperature is raised to 520 °C in air at a rate of 6 °C / min , keep warm for 2 hours, cool down to room temperature naturally, take out for later use;

[0060] (2) Primary densification of the matrix: first, using silica sol as a precursor, vacuum-impregnate the aluminum silicate fiber fabric obtained in step (1) for 8 hours, take it out and let it air in the air for 1 hour; then, vacuum-impregnate the aluminum silicate fiber fabric Put the aluminum silicate...

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Abstract

The invention relates to aluminum silicate fiber reinforced oxide ceramic. The aluminum silicate fiber reinforced oxide ceramic adopts one or a mixture of more of mullite, aluminum silicate, aluminum oxide and silicon oxide as a ceramic substrate and adopts aluminum silicate fiber as a reinforcing phase. The preparation method comprises the steps: carrying out heat treatment for an aluminum silicate fiber fabric, and removing adhesive on the surface of the fiber; taking oxide sol as a precursor, vacuum impregnating the pretreated aluminum silicate fiber fabric, then carrying out the gelatination, carrying out high-temperature ceramization, and completing primary compacting process; repeating the steps for at least ten times, so as to prepare the aluminum silicate fiber reinforced oxide ceramic. The product is excellent in mechanical property and antioxidant property and has the advantages of short preparation period, low cost, capability of realizing near-net shape and the like.

Description

technical field [0001] The invention relates to the field of oxide ceramic materials and its preparation, in particular to an aluminum silicate fiber reinforced oxide ceramic and a preparation method thereof. Background technique [0002] Ceramic materials have excellent properties such as low density, high melting point, high strength, high temperature resistance and corrosion resistance, and are popular high-temperature structural materials. However, the inherent brittleness of monolithic ceramics limits its application. The development of ceramic matrix composites is an effective way to improve the strength and toughness of ceramic materials. The commonly used toughening methods include phase transformation toughening, particle toughening, whisker toughening and continuous fiber toughening. Among them, continuous fiber-reinforced ceramic matrix composites (CFRCMCs) can minimize the volume effect of ceramic defects and consume fracture energy through mechanisms such as cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/185C04B35/18C04B35/10C04B35/14C04B35/622
Inventor 程海峰刘海韬王义
Owner NAT UNIV OF DEFENSE TECH
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