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Preparation method of zero-expansion LAS/SiC composite material

A composite material and zero-expansion technology, applied in the field of composite material preparation, can solve problems such as large internal stress of structures and parts, micro-crack structure of parts, transmission failure, etc., achieve high densification, homogeneous structure, and save preparation costs Effect

Inactive Publication Date: 2015-09-09
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, metal structures and components used in the aerospace field and space environment usually experience drastic changes in ambient temperature. The difference in coefficient of thermal expansion (CTE) between different materials will not only cause large internal stress inside the structure and components, but also cause Changes in surface contact state and tribological design (such as changes in the original structure of holes, pins, keys, etc.), resulting in functional failure, and in severe cases, microcracks and structural damage to components; in information storage and transmission , the microstructure and shape changes of materials and devices caused by thermal expansion and contraction may cause information distortion and transmission failure; in addition, the accuracy of the shape and small changes in the size of components in precision systems such as micro-electromechanical systems are crucial to their functions , but because the service environment of components often faces large temperature changes, the thermal expansion or contraction properties of materials have a significant impact on the performance stability of components, system life and application range

Method used

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  • Preparation method of zero-expansion LAS/SiC composite material
  • Preparation method of zero-expansion LAS/SiC composite material
  • Preparation method of zero-expansion LAS/SiC composite material

Examples

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Embodiment Construction

[0024] The present invention will be further described in detail below in combination with specific embodiments.

[0025] The particle size of LAS powder prepared in the following 10 examples, the particle size of selected SiC powder and the mass ratio of SiC / LAS are shown in Table 1, the specific sintering process parameters of each example are shown in Table 2, and the performance tests of the obtained samples are shown in Table 3 .

[0026] Table 1: LAS, SiC powder particle size and SiC / LAS mass ratio selected in each example

[0027]

[0028] Table 2: Sintering process parameters of LAS / SiC composite materials in various examples

[0029]

[0030]

[0031] Table 3: Measured performance values ​​of LAS / SiC composite samples obtained in various examples

[0032]

[0033] figure 1 The SEM photograph of the prepared LAS powder morphology shows that the particle size of the LAS powder prepared by reaction sintering is uniform, with an average size of 30 ...

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Abstract

Disclosed is a preparation method of a zero-expansion LAS / SiC composite material. The method comprises: firstly, preparing LAS powder via a powder sintering method; then adopting SiC powder with a matching diameter as a conditioning agent of the zero-expansion LAS / SiC composite material; calculating the ratio of LAS powder and SiC powder for macro-control of the thermal expansion coefficient of the composite material; and finally adopting a hot pressed sintering method and post-process treatment to prepare the zero-expansion LAS / SiC composite material. The composite material obtained in the invention is high in densification degree. A matrix is softened at a high temperature, so that densification is beneficial to perform. Further, the externally-applied pressure quickens the densification process, so that pores, which cannot be discharged in the absence of pressure, can be forced to be eliminated under the action of stress. Organization is homogenized; the pore ratio is reduced; and the strength of the composite material is improved.

Description

technical field [0001] The present invention relates to a method for preparing a composite material, in particular to a method for preparing a zero-expansion LAS / SiC composite material. The obtained composite material can be used for reflector lenses of astronomical telescopes, precision machinery-laser resonators, and navigation-laser gyroscopes instruments, radar radomes and other products. Background technique [0002] In the functional structures and components used in the fields of aerospace, mechanical engineering and precision instruments, the thermal expansion and contraction behavior of various materials due to temperature changes has a great impact on their service performance and reliability. For example, metal structures and components used in the aerospace field and space environment usually experience drastic changes in ambient temperature. The difference in coefficient of thermal expansion (CTE) between different materials will not only cause large internal st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/19C04B35/645
Inventor 王波张辉张亚明郭海霞曾德军邓宇宸杨建锋
Owner XI AN JIAOTONG UNIV
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