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Preparation method of low thermal conductivity and machinable ceramic matrix composites

A composite material and fiber composite material technology, applied in the field of ceramic matrix composite materials, can solve the problems of difficult processing of load-bearing parts, closed-cell or macro-porous structure, low density of composite materials, etc., to achieve strong machinability, small pores, and toughness. Good results

Active Publication Date: 2015-12-30
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, continuous silica fiber or high-silica fiber-reinforced silica-based composites are mostly prepared by 2.5D, three-dimensional and other prefabricated bodies through repeated cyclic impregnation of silica sol. Coarse, it is easy to cause closed-cell or large-pore structure, and at the same time, due to the low density of the prepared composite material, it has caused great difficulty in the processing of complex-shaped bearing parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The quartz fiber prefabricated body is prepared by interweaving and infiltrating the quartz fiber cloth and the quartz fiber mesh tire, and the density of the prefabricated body is 0.51g / cm 3 , and then soaked in acetone for 4 hours, heat treatment at 500 ° C to remove the wetting agent.

[0021] Using micron quartz powder, nano quartz powder, silica sol, inorganic silicone resin and cyclohexanone to prepare composite slurry according to the mass ratio of 1.5:0.06:1:0.1:0.03, the solid content of the composite slurry is 59.6%, and the D50 is 1.8μm , the viscosity is 120mPa·s.

[0022] The prepared composite slurry is used to impregnate the quartz fiber preform for the first time. The impregnation and forming process is assisted by vacuum and pressure means. After the composite slurry is gelled, it is heat-treated at 550°C.

[0023] Nano-quartz powder, silica sol, inorganic silicone resin and ammonium persulfate were used to prepare a composite slurry with a mass ratio ...

Embodiment 2

[0028] The quartz fiber preform is prepared by interweaving and infiltrating high silica fiber cloth and high silica fiber mesh, and the density of the preform is 0.68g / cm 3 , and then soaked in acetone for 10h, heat treatment at 550°C to remove the sizing agent

[0029] The composite slurry was prepared by using micron quartz powder, silica sol, inorganic silicone resin and acrylamide at a mass ratio of 1.8:1.3:0.05:0.05. The solid content of the composite slurry was 54.6%, the D50 was 1.8 μm, and the viscosity was 90 mPa·s.

[0030] The prepared composite slurry is used to impregnate the quartz fiber prefabricated body for the first time. The impregnation molding process is assisted by vacuum and pressure means. After the composite slurry is gelled, it is heat-treated at 500°C.

[0031] The composite slurry was prepared by using nano-quartz powder, SAR-9 silicone resin and lactic acid at a mass ratio of 1:1:0.5. The solid content of the composite slurry was 23.8%, the D50 wa...

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Abstract

The invention relates to a preparation method of a low-heat-conduction processable ceramic matrix composite material, and belongs to the technical field of ceramic matrix composite materials. The preparation method comprises the steps as follows: a fiber preform is prepared by using a needle punching technology, and an impregnating agent is removed from the fiber preform through manners of acetone immersion and heat treatment; liquid-phase circular impregnation and heat treatment of the fiber preform are performed for 2-3 times by using compound slurry which adapts to the structure of the preform; and reparative restoration of the fiber preform is performed by using silicon dioxide and aluminum oxide mixed nano aerogel, and then drying is performed, so that the low-heat-conduction high-processability fiber-reinforced ceramic matrix composite material is obtained. The ceramic matrix composite material prepared with the method has the density smaller than 1.3 g / cm<3> and the heat conductivity coefficient smaller than 0.4 W / m*K; and the heat conductivity coefficient is low, the toughness is good, and the processability is high.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and in particular relates to a preparation method of a low thermal conductivity and machinable ceramic matrix composite material. Background technique [0002] With the increase of the flight speed of the aircraft, aerodynamic heating is becoming more and more serious. In order to ensure the normal operation of the system, the lower the thermal conductivity of the load-bearing parts, the better. In order to meet the requirements of low thermal conductivity, in addition to choosing a material system with low thermal conductivity The density of the material should be low, and the shape of the load-bearing parts should be complex to meet the processing requirements. Among the many high-temperature resistant composite materials, the material system with low thermal conductivity is mainly continuous quartz fiber or high-silica fiber-reinforced silica-based composite material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/622
Inventor 韦其红王重海王洪升李伶周长灵刘建邵长涛
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS