A kind of method for improving the tensile strength of silica ceramic matrix composites

A technology of composite materials and silica, which is applied in the field of improving the tensile strength of silica ceramic matrix composite materials, can solve the problems of decreased impact resistance of radome/antenna window products, decreased reliability of weapon systems, etc., and achieves improved tensile strength. Low tensile strength, improved tensile mechanical properties, good reinforcement effect

Active Publication Date: 2019-11-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing silica ceramic-based wave-transparent composite materials still cannot fully meet the design requirements in some aspects. When used in products, it may lead to a decrease in the impact resistance of radome / antenna window products, which in turn will lead to a decrease in the reliability of the entire weapon system

Method used

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  • A kind of method for improving the tensile strength of silica ceramic matrix composites

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Effect test

Embodiment 1

[0035]Using trimethylmethoxysilane with a weight of M*7.5% (concentration: 1.25g / L) as a reagent, preheat the dried parent direction tensile specimen together with an airtight container, and then vacuumize and connect with the gas phase. Branches were dried in an oven and heat-treated at 600°C. Compared with the ungrafted samples, the average weight gain of the treated samples was 0.95%, and the average tensile strength changed from 48.578MPa to 57.653MPa, an average increase of 18.68%.

Embodiment 2

[0037] Use trimethylmethoxysilane with a weight of M*7.5% (concentration: 2.3g / L) as a reagent, preheat the dried hoop stretched sample together with a closed container, and then vacuumize and connect with the gas phase. Branches were dried in an oven and heat-treated at 600°C. Compared with the ungrafted samples, the average weight gain of the treated samples was 1.04%, and the average tensile strength changed from 27.647MPa to 34.380MPa, an average increase of 24.35%.

Embodiment 3

[0039] Using trimethylmethoxysilane with a weight of M*7.5% (concentration: 3.0g / L) as a reagent, preheat the dried hoop stretched sample together with an airtight container, then vacuumize and connect with the gas phase Branches were dried in an oven and heat-treated at 600°C. Compared with the ungrafted samples, the average weight gain of the treated samples was 0.97%, and the average tensile strength changed from 28.860MPa to 37.813MPa, an average increase of 31.02%.

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Abstract

The invention provides a method for improving tensile strength of a silica ceramic based composite material. Gas phase grafting treatment is carried out for the silica ceramic based composite material by using methoxytrimethylsilane, drying pretreatment, preheating, vacuum-pumping, gas phase grafting, drying and heat treatment and other processes are used, in order to carry out enhancement for the silica ceramic based composite material, and the tensile strength of the material is increased by 15% or above. The technology is controllable, the technical bottleneck that tensile strength of the material in the prior moulding technology is improved, and the method is especially suitable for enhancing silica ceramic radome, antenna window, and other wave-transparent components.

Description

technical field [0001] The invention relates to a method for improving the tensile strength of a silicon dioxide ceramic matrix composite material, belonging to the technical field of ceramic wave-transparent composite materials. Background technique [0002] The radome / antenna window is a component that integrates multiple functions such as wave penetration, heat insulation, load bearing and erosion resistance, and is an important part of the warhead structure of the weapon platform. Radome wave-transparent materials are mainly divided into resin-based wave-transparent materials and ceramic-based wave-transparent materials, but resin-based wave-transparent materials have poor heat resistance, and only ceramic wave-transparent materials can meet the supersonic and high-speed flight requirements of high-tech weapon radomes. Therefore, it has become a hot spot and focus of current weapon development. However, homogeneous ceramics such as fused silica and glass-ceramics are ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/84
CPCC04B41/009C04B41/4905C04B41/84C04B35/14
Inventor 张冰清杨小波于悠然张剑吴焘王华栋于长清吕毅赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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