Preparation method of lightweight high-strength heat-insulating mullite fiber porous ceramic

A mullite fiber and porous ceramic technology, which is applied in the field of fiber porous ceramics, can solve the problems of poor mechanical properties and uneven distribution of binders, achieve uniform distribution, improve dispersion and suspension characteristics, and improve the effect of firm bonding

Inactive Publication Date: 2018-06-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical problems of uneven distribution of binder and poor mechanical properties of the existing mullite fiber porous ceramics due to the preparation process, and provide a preparation of a lightweight, high-strength and heat-insulating mullite fiber porous ceramics The

Method used

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  • Preparation method of lightweight high-strength heat-insulating mullite fiber porous ceramic
  • Preparation method of lightweight high-strength heat-insulating mullite fiber porous ceramic
  • Preparation method of lightweight high-strength heat-insulating mullite fiber porous ceramic

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Embodiment 1

[0030] In this embodiment, a method for preparing a light-weight, high-strength heat-insulating mullite fiber porous ceramic is specifically carried out according to the following steps:

[0031] (1) 0.27g polyacrylamide, 0.3g boron carbide powder, 8ml silica sol (the density of silica sol used is 1.25g / cm 3 , the same below), mixed with 90ml of deionized water, stirred with a stirrer for 10 minutes until the mixture was uniform, put it into a planetary ball mill for ball milling for 8 hours, and obtained a uniformly mixed binder slurry;

[0032] (2) Weigh 6.32g of chopped polycrystalline mullite fibers with a diameter of 8μm and a length of 400μm and add them to 100ml of the binder slurry obtained in step (1), stir with a stirrer while adding, and wait for the fibers to be added Continue to stir for 15 minutes until the fibers are evenly dispersed in the binder slurry to obtain a well-dispersed fiber slurry;

[0033] (3) Pour the fiber slurry obtained in step (2) into a mold...

Embodiment 2

[0037] In this embodiment, a method for preparing a light-weight, high-strength heat-insulating mullite fiber porous ceramic is specifically carried out according to the following steps:

[0038] (1) Mix 0.3g polyacrylamide, 0.5g boron carbide powder, 8ml silica sol, and 90ml deionized water, stir with a stirrer for 15 minutes until the mixture is uniform, put it into a planetary ball mill for ball milling for 9 hours, and obtain a uniformly mixed binder slurry;

[0039](2) Weigh 6.32g of chopped mullite fibers with a diameter of 10μm and a length of 500μm and add them to 100ml of the binder slurry obtained in step (1), stir with a stirrer while adding them, and wait until the fibers are added Continue to stir for 20 minutes until the fibers are evenly dispersed in the binder slurry to obtain a well-dispersed fiber slurry;

[0040] (3) Pour the fiber slurry obtained in step (2) into a mold with a filter screen at the lower end, turn on the vacuum pump, and set the suction fil...

Embodiment 3

[0044] In this embodiment, a method for preparing a light-weight, high-strength heat-insulating mullite fiber porous ceramic is specifically carried out according to the following steps:

[0045] (1) Mix 0.5g polyacrylamide, 0.5g boron carbide powder, 8ml silica sol, and 90ml deionized water, stir with a stirrer for 20 minutes until the mixture is uniform, put it into a planetary ball mill for ball milling for 12 hours, and obtain a uniformly mixed binder slurry;

[0046] (2) Weigh 10 g of chopped polycrystalline mullite fibers with a diameter of 10 μm and a length of 600 μm and add them to the binder slurry obtained in step (1), stir with a stirrer while adding them, and wait until the fibers are added Continue to stir for 25 minutes until the fibers are evenly dispersed in the binder slurry to obtain a well-dispersed fiber slurry;

[0047] (3) Pour the fiber slurry obtained in step (2) into a mold with a filter screen at the lower end, turn on the vacuum pump, set the sucti...

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Abstract

The invention relates to a preparation method of a lightweight high-strength heat-insulating mullite fiber porous ceramic. Deionized water, polyacrylamide, boron carbide powder and silica sol are mixed and placed in a planetary ball mill for ball milling to obtain evenly-mixed binder slurry; chopped polycrystalline mullite fiber is added to the binder slurry and stirred to obtain fiber slurry; thefiber slurry is poured into a mold having a filter screen at the lower end, and filtered by suction by a vacuum pump to obtain a fiber porous ceramic wet body; after the fiber porous ceramic wet bodyis demolded, the fiber porous ceramic wet body is placed in an ultra-low temperature refrigerator for freezing; and the completely-frozen body is placed in a freeze dryer for freeze-drying to obtaina mullite fiber porous ceramic dry body, and the dried body is sintered in a high temperature furnace to obtain the mullite fiber porous ceramic. The preparation method overcomes the problems that thefiber porous ceramic has high density, low porosity and low compressive strength due to uneven bond distribution. A porous ceramic binder is evenly distributed at fiber nodes to support and fix fiber.

Description

technical field [0001] The invention relates to the technical field of fiber porous ceramics, in particular to a preparation method of lightweight and high-strength heat-insulating mullite fiber porous ceramics. Background technique [0002] With the rapid development of the aerospace field, the research and development of new high-speed aerospace vehicles in various countries is heating up day by day. Since the spacecraft flies in the atmosphere at a high Mach number, it has to withstand the influence of severe heat, vibration, shock and other complex environments. Therefore, higher requirements are put forward for the thermal protection materials and structures of the spacecraft, which need to have a lower Density, higher strength and better heat insulation performance, etc. [0003] Mullite fiber porous ceramics is made of mullite fiber as the main material, which overlaps each other to form a fiber network structure similar to a bird's nest, and the nodes of the fibers ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/185C04B35/622C04B38/00
CPCC04B35/185C04B35/622C04B35/80C04B38/0038C04B2235/3418C04B2235/3821C04B2235/526C04B2235/5264C04B2235/602C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607
Inventor 杜海燕李玲玉胡小侠陈小平王文杰杨立娜
Owner TIANJIN UNIV
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