a zro 2 -sio 2 Low temperature rapid preparation method of matrix composites

A composite material, low temperature technology, applied in the field of rapid preparation of ZrO2-SiO2 matrix composite materials at low temperature, can solve the problems of low yield of oxide sol ceramics, decreased strength of quartz fibers, formation of cracks and pores, etc., to shorten the preparation period, reduce Preparation cost, easy to formulate effect

Active Publication Date: 2020-05-08
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the ceramic yield of oxide sol is relatively low (2 -SiO 2 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; (3) ZrO 2 -SiO 2 The sol preparation temperature is high (≥1000°C), which has a great influence on the fiber system, especially the quartz fiber (the activity of the quartz fiber is relatively high, and the strength of the quartz fiber will decrease significantly in the environment above 800°C); so

Method used

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  • a zro <sub>2</sub> -sio <sub>2</sub> Low temperature rapid preparation method of matrix composites
  • a zro <sub>2</sub> -sio <sub>2</sub> Low temperature rapid preparation method of matrix composites
  • a zro <sub>2</sub> -sio <sub>2</sub> Low temperature rapid preparation method of matrix composites

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Effect test

Embodiment 1

[0029] a ZrO 2 -SiO 2 Matrix composite material, high temperature resistant inorganic fiber cloth or thin layer fabric is quartz fiber cloth, the thickness of product material is 3mm, and its preparation method is as follows figure 1 As shown, the following steps are included: (1) flat lay 8 layers of 0.28mm thick quartz fiber cloth, and then perform suture processing. The fiber used for suture is commercially available common 750Tex mullite fiber, which has better flexibility , not easy to break, in order to obtain better mechanical properties, the distance between every two sutures is designed to be 10mm; (2) ZrO 2 Micropowder (200 mesh) is placed in silica sol, wherein silica sol and ZrO 2 The mass ratio of the micropowder is 5:1, stirred by magnetic force for 4h; (3) clamp the quartz fiber cloth obtained in step (1) with a graphite mold, place it in a vacuum container, vacuum inhale the sol obtained in step (2), and soak for 2h, Then make it gelatinized at a temperature o...

Embodiment 2

[0033] a ZrO 2 -SiO 2 Matrix composite material, wherein the high temperature resistant inorganic fiber cloth or thin layer fabric is 2.5D woven alumina fiber, and the thickness of the product material is 1.0mm. Its preparation method is as figure 1 Shown, comprise the following steps: (1) ZrO 2 Micropowder (100 mesh) is placed in silica sol, wherein silica sol and ZrO 2 The mass ratio of the micropowder is 1:1, and the suspension is formed by magnetic stirring for 6 hours; (2) A layer of 2.5D alumina fiber woven piece is laid flat, and then punctured. The fiber used for acupuncture is 600Tex alumina Fiber, the distance between every two acupuncture lines is 5mm; (3) clamp the alumina fiber 2.5D braided piece with graphite mold after the puncture obtained in step (2), place it in a vacuum container, and vacuum inhale the obtained product in step (1) Slurry suspension, and then gelatinized at a temperature of 150°C, repeated dipping and gelatinization 8 times; (4) Put the a...

Embodiment 3

[0038] a ZrO 2 -SiO 2 Matrix composite material, wherein the high temperature resistant inorganic fiber cloth or thin layer fabric is silicon carbide fiber cloth, and the material thickness is 3.0mm. Its preparation method is as figure 1 Shown, comprise the following steps: (1) ZrO 2 Micropowder (200 mesh) is placed in silica sol, wherein silica sol and ZrO 2 The mass ratio of the micropowder is 2:1, and the suspension is formed by magnetic stirring for 4 hours; (2) 3 layers of silicon carbide fiber cloth with a thickness of 0.9mm are laid flat, and then punctured to form a silicon carbide fiber cloth "skin". The fiber used in the puncture is 600Tex silicon carbide ceramic fiber, and the distance between every two needle punching lines is 10mm; (3) clamp the silicon carbide fiber cloth "skin" obtained in step (2) with a graphite mold, and place it in a vacuum container , vacuum inhale the suspension obtained in step (1), then gelatinize it at a temperature of 100°C, and re...

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Abstract

The invention provides a low-temperature rapid preparation method of a ZrO2-SiO2-based composite material. The method comprises the following steps: (a) weighing silicon oxide sol and ZrO2 micropowderaccording to a certain ratio, adding the ZrO2 micropowder into the silicon oxide sol and magnetically stirring for six or more hours to form suspension liquid of the silicon oxide sol doped with theZrO2 micropowder; (b) clamping a high-temperature-resistant inorganic fiber cloth or a thin-layer fabric by using a graphite die, putting the high-temperature-resistant inorganic fiber cloth or the thin-layer fabric in a vacuum container and vacuumizing, then sucking the suspension liquid obtained in the step (a) and completely dipping the high-temperature-resistant inorganic fiber cloth or the thin-layer fabric; then rapidly transferring the dipped high-temperature-resistant inorganic fiber cloth or thin-layer fabric into a drying oven for carrying out heat treatment for gelatinizing, naturally cooling to room temperature and solidifying, repeatedly carrying out overall dipping, gelatinizing and naturally cooling for 5-8 times; and (c) putting the obtained hard solid in a muffle furnace for carrying out high-temperature heat treatment under the treatment temperature being lower than 800 DEG C, finally cooling to the room temperature to obtain the ZrO2-SiO2-based composite material.

Description

technical field [0001] The invention belongs to the preparation of ZrO by sol-gel method and mud method 2 -SiO 2 In the field of matrix composite materials, especially a low-temperature rapid preparation of ZrO 2 -SiO 2 method for matrix composites and its preparation of ZrO 2 -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, but due to SiO 2 The mechanical properties of ceramics are low, and they are prone to softening at high temperatures, which limits the performance of SiO to a certain extent. 2 High temperature applications of matrix composites. [0003] ZrO 2 It has the characteristics of corrosion resistance, high temperature resistance, high strength and good toughness. It is an excellent high temperature corrosion resistance and redox composite material. It has very importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/84C04B35/80C04B35/624
CPCC04B35/624C04B35/803C04B2235/3244C04B2235/3418C04B2235/5228C04B2235/5244C04B2235/77C04B2235/96
Inventor 向阳曹峰彭志航
Owner NAT UNIV OF DEFENSE TECH
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