Al2O3-SiO2 based composite material and rapid preparation method thereof

A technology of al2o3-sio2 and composite materials, which is applied in the field of Al2O3-SiO2-based composite materials and sol-gel method to prepare Al2O3-SiO2-based composite materials, which can solve the problems of matrix cracks and pores, low ceramic yield, long production cycle, etc. problem, achieve high production efficiency, easy preparation, and reduce preparation cost

Active Publication Date: 2018-09-04
湖南福易达电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic yield of oxide sol is relatively low (<30wt%), and generally requires multiple densification cycles to produce relatively dense composite materials, and the production cycle is long (≥20 cycles); (2) oxide sol The sol has a certain volume shrinkage during the gelation and drying process, and it is easy to form defects such as cracks and pores in the matrix

Method used

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  • Al2O3-SiO2 based composite material and rapid preparation method thereof
  • Al2O3-SiO2 based composite material and rapid preparation method thereof
  • Al2O3-SiO2 based composite material and rapid preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] a kind of Al 2 o 3 -SiO 2 Matrix composite material, its preparation method according to figure 1 shown, including the following steps:

[0026](1) Lay 9 layers of 0.28mm thick quartz fiber cloth, and then sew it up. The fiber used for sewing up is a commercially available 750Tex mullite fiber, which has good flexibility and is not easy to break. Excellent mechanical properties, the space between every two sutures is designed to be 15mm;

[0027] (2) Alumina micropowder (200 mesh) is placed in silica sol, wherein the mass ratio of silica sol and alumina micropowder is 5:1, and stirred by magnetic force for 4h;

[0028] (3) Clamp the quartz fiber cloth obtained in step (1) with a stainless steel mold, place it in a vacuum container, vacuum inhale the sol obtained in step (2), soak it for 2 hours, and then make it gel at a temperature of 200 ° C. Cool to room temperature to carry out cross-linking solidification, repeated dipping and gelling treatment 5 times;

[00...

Embodiment 2

[0034] a kind of Al 2 o 3 -SiO 2 Matrix composite material, its preparation method according to figure 1 shown, including the following steps:

[0035] (1) Alumina micropowder (100 mesh) is placed in silica sol, wherein the mass ratio of silica sol and alumina micropowder is 1:1, and a suspension is formed by magnetic stirring for 6 hours;

[0036] (2) Lay 1 layer of alumina fiber 2.5D woven piece, and then perform puncture treatment. The fiber used for needle punching is 600Tex alumina fiber, and the distance between every two needle punching lines is 10mm;

[0037] (3) Clamp the punctured alumina fiber 2.5D braided piece obtained in step (2) with a high-temperature resistant stainless steel mold, place it in a vacuum container, vacuum inhale the suspension obtained in step (1), and then heat it at a temperature of 150 ° C. Make it gelatinized, dipping and gelatinizing repeatedly 8 times;

[0038] (4) Place the alumina fiber 2.5D woven piece treated in step (3) in a rece...

Embodiment 3

[0044] a kind of Al 2 o 3 -SiO 2 Matrix composite material, its preparation method according to figure 1 shown, including the following steps:

[0045] (1) Alumina micropowder (200 mesh) is placed in silica sol, wherein the mass ratio of silica sol and alumina micropowder is 2:1, forms suspension by magnetic force stirring 4h;

[0046] (2) Lay two layers of silicon carbide fiber cloth with a thickness of 0.9mm, and then perform puncture treatment to form a "skin" of silicon carbide fiber cloth. The fiber used for acupuncture is 600Tex silicon carbide ceramic fiber. Every two needles Line spacing is 5mm;

[0047] (3) Clamp the silicon carbide fiber cloth "skin" obtained in step (2) with a high-temperature-resistant stainless steel mold, place it in a vacuum container, vacuum inhale the suspension obtained in step (1), and then use it at a temperature of 100 ° C. Its gelation, repeated dipping and gelation 10 times;

[0048] (4) Place the silicon carbide fiber cloth "skin"...

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Abstract

The invention discloses a rapid preparation method of an Al2O3-SiO2 based composite material. The method comprises the following steps: a) weighing silica sol and an alumina micro powder according toa certain ratio, adding the alumina micro powder into the silica sol, performing magnetic stirring for more than two hours, and forming a turbid liquid of a silica sol doped alumina micro powder; b) clamping high-temperature resistant inorganic fiber cloth or a thin-layered fabric by a high-temperature resistant mold, vacuumizing in a vacuum container, and sucking the turbid liquid of a silica soldoped alumina micro powder for performing mass-impregnation; rapidly transferring the high-temperature resistant inorganic fiber cloth or thin-layered fabric impregnated with turbid liquid into a drying oven to perform heat treatment, and enabling the inorganic fiber cloth or thin-layered fabric to gel; naturally cooling to a room temperature so as to perform cross-linked curing, and repeatedly performing mass-impregnation-gelling-natural cooling for 5-10 times; c) performing high-temperature heat treatment on obtained hard solids in a muffle furnace, and finally cooling to the room temperature, so as to obtain the Al2O3-SiO2 based composite material.

Description

technical field [0001] The invention belongs to the preparation of Al by sol-gel method 2 o 3 -SiO 2 The field of matrix composite materials, especially related to an Al 2 o 3 -SiO 2 Rapid preparation method of matrix composites and the prepared Al 2 o 3 -SiO 2 base composite material. Background technique [0002] Due to the tightness and integrity of its structural network, the higher bond strength between atoms, SiO 2 Ceramics have low density and excellent thermophysical properties, Al 2 o 3 Ceramic is a widely used ceramic material with high strength, high hardness, low density and excellent chemical stability, and it is cheap and has excellent mechanical properties. The brittleness of ceramics can be significantly improved by introducing reinforcing and toughening fibers. Gives ceramics a metal-like fracture behavior. Due to SiO 2 The mechanical properties of ceramics are low, and they are prone to softening at high temperatures, which limits the performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/82C04B35/14C04B35/624C04B35/622C04B35/84C04B35/80
CPCC04B35/14C04B35/622C04B35/624C04B35/803C04B35/82C04B2235/3217C04B2235/5224C04B2235/5232C04B2235/5244C04B2235/77C04B2235/96C04B2235/9607
Inventor 文瑾易璐陈兵
Owner 湖南福易达电子科技有限公司
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