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Preparation method of nanowire reinforced silicon nitride foamed ceramic composite silicon dioxide aerogel and product thereof

A technology of composite silica and foamed ceramics, which is applied in ceramic products, other household utensils, applications, etc., can solve the problems of small bonding area of ​​primary particles, poor thermal conductivity, weak bonding force, etc., and achieve uniform distribution of toughening, Increased toughness and high flexural strength

Active Publication Date: 2021-05-18
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the currently published patents (such as patents CN103553693A, CN106866180A) using airgel to impregnate foamed ceramics all use airgel sol to directly impregnate unmodified porous ceramics. At this time, the ceramic pores are in direct contact with the airgel. The resulting binding force is relatively weak, and the inorganic airgel is inherently brittle. The high-porosity structure makes the bonding area between the primary particles small, so it is easy to break in the neck area, and the powder falls off, which leads to thermal conductivity. Technical issues with poor coefficients

Method used

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  • Preparation method of nanowire reinforced silicon nitride foamed ceramic composite silicon dioxide aerogel and product thereof
  • Preparation method of nanowire reinforced silicon nitride foamed ceramic composite silicon dioxide aerogel and product thereof
  • Preparation method of nanowire reinforced silicon nitride foamed ceramic composite silicon dioxide aerogel and product thereof

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Experimental program
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Effect test

Embodiment 1

[0045] Take by weighing 44% silicon powder, 47% deionized water, 1% aluminum oxide, and 2% yttrium oxide by mass, put the above raw materials into a ball mill, and stir for 20 hours. Then add protein powder with a mass percentage of 6%, and discharge after stirring for 2 hours to obtain a slurry. When forming, pour the mixed slurry into the forming mold. Seal the mold with a plastic wrap and put it into a water bath furnace, solidify it at 80°C for 1 hour, demould it, and dry it in the air for more than 72 hours to obtain a molded body. Put the green body in a crucible and embed silicon nitride powder around it, put it into a nitriding furnace and vacuumize the furnace, and then pass in 0.1MPa nitrogen gas for sintering. The sintering system is as follows: the temperature rise rate is 10°C / min in the range of room temperature (25°C) to 1000°C; the temperature rise rate is 5°C / min from 1000°C to 1200°C; Keep warm for 2 hours, keep warm at 1350°C for 10 hours, and finally cool...

Embodiment 2

[0049] Take by weighing 44% silicon powder, 47% deionized water, 1% aluminum oxide, and 2% yttrium oxide by mass, put the above raw materials into a ball mill, and stir for 20 hours. Then add protein powder with a mass percentage of 6%, and discharge after stirring for 2 hours to obtain a slurry. When forming, pour the mixed slurry into the forming mold. Seal the mold with a plastic wrap and put it into a water bath furnace, solidify it at 80°C for 1 hour, demould it, and dry it in the air for more than 72 hours to obtain a molded body. Put the green body in a crucible and embed silicon nitride powder around it, put it into a nitriding furnace and vacuumize the furnace, and then pass in 0.1MPa nitrogen gas for sintering. The sintering system is as follows: the temperature rise rate is 10°C / min in the range of room temperature (25°C) to 1000°C; the temperature rise rate is 5°C / min from 1000°C to 1200°C; Keep warm for 2 hours, keep warm for 8 hours at 1400°C, and finally cool ...

Embodiment 3

[0053] Take by weighing 44% silicon powder, 47% deionized water, 1% aluminum oxide, and 2% yttrium oxide by mass, put the above raw materials into a ball mill, and stir for 20 hours. Then add protein powder with a mass percentage of 6%, and discharge after stirring for 2 hours to obtain a slurry. When forming, pour the mixed slurry into the forming mold. Seal the mold with a plastic wrap and put it into a water bath furnace, solidify it at 80°C for 1 hour, demould it, and dry it in the air for more than 72 hours to obtain a molded body. Put the green body in a crucible and embed silicon nitride powder around it, put it into a nitriding furnace and vacuumize the furnace, and then pass in 0.1MPa nitrogen gas for sintering. The sintering system is as follows: the temperature rise rate is 10°C / min in the range of room temperature (25°C) to 1000°C; the temperature rise rate is 5°C / min from 1000°C to 1200°C; Keep warm for 2 hours, keep warm for 8 hours at 1450°C, and finally cool ...

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Abstract

The invention relates to the technical field of thermal insulation materials, and particularly discloses a preparation method of nanowire reinforced silicon nitride foamed ceramic composite silicon dioxide aerogel and a product thereof. Ceramic slurry containing silicon powder, water, a sintering aid and protein powder is cured, formed and dried to prepare a green body; the green body is embedded into silicon nitride powder, and nitrogen sintering is perfromed to obtain nanowire reinforced silicon nitride foamed ceramic; and the nanowire reinforced silicon nitride foamed ceramic is further put into SiO2 sol, vacuum impregnation, gelling, solution replacement and drying are performed to obtain the nanowire reinforced silicon nitride foamed ceramic composite silicon dioxide aerogel. According to the preparation method, the steps of the nanowire reinforced foamed ceramic are simplified, the silicon dioxide aerogel and the ceramic are connected more tightly due to the existence of the nanowire, the aerogel is prevented from falling off, the service life of the material is prolonged, and large-scale production is promoted.

Description

technical field [0001] The invention relates to the technical field of heat-resistant insulation materials, in particular to a method for preparing a nanowire-reinforced silicon nitride foam ceramic composite silica airgel and a product thereof. Background technique [0002] Silica airgel is a porous material formed by the aggregation of nanometer-scale ultrafine particles. It has a continuous spatial network three-dimensional structure inside. It has the characteristics of low density, high porosity, high specific surface area, and low thermal conductivity. It can be widely used in Efficient heat insulation protection, sound insulation and noise reduction, catalyst carrier, filtration and adsorption and other fields. But at the same time, it also has the inherent disadvantages of poor mechanical properties of airgel, such as weak internal binding force, which leads to low strength and easy breakage of the material. [0003] Impregnation of foamed ceramics with airgel can r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/591C04B35/622C04B41/85
CPCC04B38/10C04B35/591C04B35/622C04B41/009C04B41/50C04B41/85C04B2235/3217C04B2235/3225C04B2235/3227C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/9607C04B41/4535
Inventor 杨自春赵爽杨飞跃陈国兵陈俊李昆锋费志方李肖华
Owner NAVAL UNIV OF ENG PLA
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