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Preparation method of whisker and particle synergistically toughened laminar ceramic matrix composite

A composite material and ceramic-based technology, applied in the field of material preparation, can solve the problems of large damage of reinforcement, high sintering temperature, limited effect, etc., and achieve the effects of improving compactness, improving strength and toughness, and reducing damage

Active Publication Date: 2014-11-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Adding whiskers or particles to layered ceramics is expected to further improve their toughness, but the effect is limited
Moreover, no matter what kind of molding process is used to prepare the layered green body, it is generally sintered under normal pressure or hot pressing in air or a protective atmosphere. Contribution of bulk to the strengthening and toughening of ceramics

Method used

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  • Preparation method of whisker and particle synergistically toughened laminar ceramic matrix composite
  • Preparation method of whisker and particle synergistically toughened laminar ceramic matrix composite
  • Preparation method of whisker and particle synergistically toughened laminar ceramic matrix composite

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1: (1) SiC whiskers with an aspect ratio of 8-11 and SiC particles with a diameter of 0.5 μm are used as reinforcements, and 20% alcohol by volume fraction is used as a solution, ultrasonicated for 30 minutes, magnetically stirred for 2 hours, and baked Dry;

[0033] (2) The (SiC whisker + SiC particles) film was prepared by casting method, the film thickness was 500 μm, the volume percentage of whiskers was 40%, and the volume fraction of particles was 13%;

[0034] (3) with trichloromethylsilane (CH 3 SiCl 3 , MTS) as source material, argon as diluent gas (flow rate 300-400ml / min), hydrogen as carrier gas (flow rate 200-350ml / min), H 2 The molar ratio to MTS is 10:1, the SiC substrate is deposited on the film by chemical vapor infiltration method, the deposition temperature is 1000-1100 ° C, and the deposition time is 80-100 h;

[0035] (4) Double-sided cast (SiC whisker + SiC particle) film on (SiC whisker + SiC particle) single-layer composite material, t...

Embodiment 2

[0039] Example 2: (1) SiC whiskers with an aspect ratio of 8 to 11 and SiC particles with a diameter of 0.5 μm are used as reinforcements, and 20% alcohol by volume fraction is used as a solution, ultrasonicated for 30 minutes, magnetically stirred for 2 hours, and baked Dry;

[0040] (2) The (SiC whisker + SiC particles) film was prepared by casting method, the film thickness was 500 μm, the volume percentage of whiskers was 30%, and the volume fraction of particles was 10%;

[0041] (3) with trichloromethylsilane (CH 3 SiCl3 , MTS) as source material, argon as diluent gas (flow rate 300-400ml / min), hydrogen as carrier gas (flow rate 200-350ml / min), H 2 The molar ratio to MTS is 10:1, the SiC substrate is deposited on the film by chemical vapor infiltration method, the deposition temperature is 1000-1100 ° C, and the deposition time is 80-100 h;

[0042] (4) Double-sided cast (SiC whisker + SiC particle) film on (SiC whisker + SiC particle) single-layer composite material, ...

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Abstract

The invention relates to a preparation method of a whisker and particle synergistically toughened laminar ceramic matrix composite, wherein the whiskers and particles are uniformly dispersed to synergistically toughen the laminar ceramic matrix composite. A SiC matrix is deposited in a film by using a chemical vapor infiltration method so that the preparation of a layer of (SiC whisker+SiC particle) / SiC composite; film casting is carried out on the basis; and the process is repeated so as to obtain a (SiC whisker+SiC particle) / SiC laminar ceramic matrix composite. Compared with the known method of preparing the laminar ceramic matrix composite, the preparation method has the advantages of decreasing the damage of toughening bodies in the preparation process and improving the compactness of the composite; and the tension strength of the whisker and particle synergistically toughened laminar ceramic matrix composite prepared according to the chemical vapor infiltration method is up to 90-120MPa.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing a layered ceramic matrix composite material synergistically toughened by whiskers and particles. Background technique [0002] Silicon carbide structural ceramics have excellent properties in terms of high temperature resistance, wear resistance, corrosion resistance, high strength, and oxidation resistance, and are increasingly widely used in the fields of machinery, electronics, aerospace, energy, and metallurgy. However, due to the high brittleness of ceramics and its sensitivity to defects, its reliability and damage resistance are poor, which seriously restricts its practical application. The strengthening and toughening of ceramic materials has become a research hotspot for material researchers all over the world. [0003] In the long-term evolution process of nature, biological materials with perfect structure, tissue shape and unique exc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/81C04B35/78C04B35/565C04B35/622
Inventor 成来飞解玉鹏张立同梅辉刘小瀛陈超
Owner NORTHWESTERN POLYTECHNICAL UNIV