Method for preparing microcrystalline glass composite material containing alumina

A technology of glass-ceramics and composite materials, applied in the direction of alumina/hydroxide, etc., can solve the problems of high energy consumption, long production cycle, high brittleness, etc., and achieve the effect of low preparation cost and good uniformity

Inactive Publication Date: 2009-10-28
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass-ceramics containing alumina are often brittle and prone to catastrophic fracture during use, which limits the scope of use of this material. Therefore, the toughening of glass-ceramics is an important issue
At present, the main toughening methods of glass-ceramics include phase change toughening, fiber toughening, whisker toughening and particle toughening. Among them, certain types of glass-ceramics made of carbon fiber and alumina not only have greater toughness after being prepared into composite materials. The strength of the material has also been greatly increased, so it has received widespread attention. At present, the main preparation methods of carbon fiber reinforced glass-ceramics composite materials are: (1) Prepare alumina-containing glass-ceramics by traditional melting method or calcination method , and then the alumina-containing glass-ceramic powder is mixed with a binder and a solvent to form a slurry, and then the carbon fiber-reinforced alumina-containing glass-ceramic composite material is prepared by using a slurry impregnation and hot-pressing sintering process. This method requires high-temperature melting glass, High energy consumption; (2) Precursor impregnation pyrolysis (PIP) method, this method can prepare components with complex shapes, but the production cycle is long and the cost is high; (3) The sol-gel method is used to prepare alumina-containing microcrystals For glass, use the prepared sol as a slurry, and then prepare carbon fiber reinforced alumina-containing glass-ceramic composite materials by slurry impregnation and hot pressing sintering processes. In this method, alkoxide is generally used as the initial raw material, and the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Aluminum nitrate or aluminum chloride is made into an aqueous solution, and when the above solution is heated to 80°C, ammonia water is added dropwise to the solution until it becomes viscous, and the reaction generates boehmite sol, and the generated boehmite sol and silica sol Mixing, the pH value of the silica sol is 3 to 4, after mixing evenly, add the aqueous solution of lithium nitrate to the mixture of boehmite sol and silica sol, keep stirring until uniform, and dry the resulting sol mixture at 100°C to obtain Precursors containing alumina, silicon dioxide and lithium ions; (2) placing the prepared precursors containing alumina, silicon dioxide and lithium ions in a box furnace, and keeping the temperature at 500°C 1 hour, generate lithium-aluminosilicate glass powder; (3) make glass powder into slurry, and prepare carbon fiber-reinforced glass-ceramic and ceramic composite material prepreg tape by slurry impregnation method; (4) prepare prepreg The dipping ...

Embodiment 2

[0019] The difference between this example and Example 1 is that (1) step is: make aluminum nitrate or aluminum chloride into an aqueous solution, and when the above solution is heated to 80°C, add ammonia water dropwise to the solution until it becomes viscous, and the reaction forms boron Boehmite sol, mix the generated boehmite sol with silica sol, the pH of the silica sol is 3 to 4, after mixing evenly, dry the resulting sol mixture at 100°C to obtain alumina and silica For the precursor, other steps and process conditions are the same as in Example 1, and the sintering temperature is controlled at 1400° C. for 1 hour to obtain a dense carbon fiber reinforced mullite phase composite material. The bending strength is 688MPa, and the fracture toughness is 16.2MPa m 1 / 2 .

Embodiment 3

[0021] The difference between this embodiment and specific embodiment 1 is that (1) step is: make aluminum nitrate or aluminum chloride into an aqueous solution, and when the above solution is heated to 80°C, add ammonia water dropwise to the solution until it becomes viscous, and the reaction forms Boehmite sol, mix the generated boehmite sol with silica sol, the pH of the silica sol is 3 to 4, after mixing evenly, add the aqueous solution of magnesium nitrate to the mixture of boehmite sol and silica sol, and keep stirring To uniformity, the resulting sol mixture was dried at 100°C to obtain a precursor containing alumina, silicon dioxide and magnesium ions. The other steps and process conditions were the same as in Example 1, and the sintering temperature was controlled to keep the temperature at 1300°C. After 1 hour, a dense carbon fiber reinforced cordierite phase composite material was obtained. The bending strength is 573MPa, and the fracture toughness is 12.3MPa m 1 / 2...

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Abstract

The invention relates to a method for preparing a microcrystalline glass composite material containing alumina, which comprises the following steps: adopting boehmite sol to prepare a microcrystalline glass precursor containing the alumina; performing heat treatment on the precursor at a temperature of around 500 DEG C; mixing amorphous microcrystalline glass powder containing the alumina after the heat treatment with a solvent and a binding agent to prepare slurry; and preparing the unidirectional carbon fiber reinforced microcrystalline glass composite material containing the alumina by adopting the prior art of slurry soaking and hot pressed sintering. Compared with the unidirectional carbon fiber reinforced microcrystalline glass composite material containing the alumina, which is prepared through slurry soaking and hot pressed sintering by founding glass first and then preparing matrix powder, the microcrystalline glass composite material containing the alumina has the characteristics of low energy consumption, simple process, good evenness of basic components, low firing temperature and the like.

Description

technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a carbon fiber reinforced glass-ceramic composite material containing alumina. Background technique [0002] We know that certain types of glass-ceramics containing alumina have excellent insulating properties, low dielectric loss, stable dielectric constant, thermal expansion coefficient can be adjusted in a wide range, chemical corrosion resistance, wear resistance, and good thermal stability. Features such as high temperature. The glass-ceramics with ultra-low expansion can be used to prepare cooking utensils, high-temperature electric light source glass, high-temperature observation windows, chemical pipelines, etc. It can also be used to prepare reflectors for large astronomical telescopes and laser gyroscopes for aviation. However, glass-ceramics containing alumina are often brittle and prone to catastrophic fracture during use, which l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C03C10/00C01F7/02
Inventor 温广武夏龙宋亮覃春林王鑫宇
Owner HARBIN INST OF TECH AT WEIHAI
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