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Preparation method of whisker and pacticle toughening ceramic base composite

A technology for composite materials and toughened ceramics, which is applied in the field of preparation of whiskers and granular ceramic matrix composite materials, can solve the problems of low performance, limited application range of hot pressing sintering, low performance of composite materials, etc., and achieve good performance and designability Strong, toughness-increasing effect

Active Publication Date: 2005-03-23
XIAN XINGUI CERAMIC COMPOSITE MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to overcome the low performance of the composite material caused by the difficulty of evenly dispersing the composite material in the prior art, it is difficult to obtain large, complex and thin-walled whiskers and the green body of the particle composite material, and there is no pressure-sintered crystal whisker and the low performance of the particle ceramic matrix composite material , the scope of application of hot pressing sintering is even more limited, the present invention proposes a method for preparing particle and whisker toughened ceramic matrix composites by chemical vapor infiltration

Method used

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  • Preparation method of whisker and pacticle toughening ceramic base composite
  • Preparation method of whisker and pacticle toughening ceramic base composite
  • Preparation method of whisker and pacticle toughening ceramic base composite

Examples

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Effect test

Embodiment 1

[0030] This example is the preparation of silicon carbide whisker toughened silicon carbide ceramic matrix composite material.

[0031] Silicon carbide whiskers with a diameter of 1.5 μm and an aspect ratio of 8 to 10 are selected as the reinforcement, 5% PVA aqueous solution is used as the prefabricated binder, and the phenolic resin ethanol solution is used as the granulation binder, and the concentration of the solution is 0.5 g / ml.

[0032] During preparation, mix 150g of silicon carbide whiskers with 100ml of phenolic resin solution, press and crush it four times with a pressure of 10-20MPa, dry in the shade at room temperature for 24 hours, and dry at 120°C for 2 hours. After crushing, sieving and granulation, the granule group with a diameter of 0.6-1.0mm is selected to be mixed with 15-30%wt PVA aqueous solution, and prefabricated under a pressure of 3-8MPa. The molded preform was dried in the shade at room temperature for 24 hours, dried at 120°C for 2 hours, and the...

Embodiment 2

[0035] This example is the preparation of silicon nitride particle toughened silicon nitride ceramic matrix composite material

[0036] Silicon nitride powder with a diameter of 6 μm is selected as the particle reinforcement, 5% PVA aqueous solution is used as the prefabricated binder, and phenolic resin ethanol solution is used as the granulation binder, and the concentration of the solution is 0.5g / ml.

[0037] During preparation, mix 150g of silicon nitride powder with 50ml of phenolic resin solution, press and crush it four times with a pressure of 10-20MPa, dry in the shade at room temperature for 24 hours, and dry at 120°C for 2 hours. After crushing, sieving and granulation, the granule group with a diameter of 0.6-1.0mm is selected to be mixed with 10-25%wt PVA aqueous solution, and prefabricated under a pressure of 3-8MPa. The molded preform was dried in the shade at room temperature for 24 hours, dried at 120°C for 2 hours, and then placed in a deposition furnace to ...

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Abstract

A crystal whisker and particle toughened ceramic-based composition used to make large thin-wall member is prepared through granulating to prepare the coagulated substance of crystal whiskers and particles, preparing the prefabricated body of crystal whisker-particle reinforcing body, and depositing the ceramic base in said prefabricated body by chemical vapour osmosis process.

Description

(1) Technical field: [0001] The invention relates to a method for preparing a whisker and granular ceramic matrix composite material. (two) background technology: [0002] Ceramic matrix composites are a new generation of strategic thermal structural materials that replace metals. Their outstanding advantages are high temperature resistance and low density, and they have broad application prospects in aviation, aerospace and other fields. Ceramic matrix composites mainly have three toughening methods: continuous fiber, whisker and particle toughening. Among them, fiber toughened composites have fracture behavior similar to technology, are not sensitive to cracks, and have high reliability characteristics that will not cause catastrophic damage. , while whisker and particle composites are characterized by low cost. Therefore, the three composite materials of fibers, whiskers and particles constitute a complete ceramic matrix composite system, and they all play an important r...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B35/634C04B35/80
Inventor 成来飞张立同徐永东刘永胜李镇王晓明
Owner XIAN XINGUI CERAMIC COMPOSITE MATERIAL CO LTD
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