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Preparation method of novel interface phase material

An interface phase and a new type of technology, applied in the field of preparation of new interface phase materials, can solve the problems of poor oxidation resistance and inability to apply high-temperature water vapor and high-speed gas environment, etc., to achieve the effect of prolonging the service life and good high temperature resistance and oxidation resistance

Active Publication Date: 2021-08-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional interface phase pyrolysis carbon (PyC) and hexagonal boron nitride (h-BN) have the above characteristics, they cannot be applied to the high-speed gas environment rich in high-temperature water vapor due to their poor oxidation resistance.

Method used

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  • Preparation method of novel interface phase material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for preparing a high-temperature-resistant and anti-oxidation novel interface phase material, comprising the following steps:

[0034] Step 1. Degumming the SiC fiber preform at a temperature of 500-700° C. and nitrogen atmosphere for 0.5-1 hour.

[0035]Step 2. Mix ethyl orthosilicate and absolute ethanol in a ratio of 17:12 by volume under a magnetic heating stirrer, then add the mixture of dilute hydrochloric acid and deionized water drop by drop, and continue to stir at a constant temperature for two Hours, a stable, transparent silica sol was obtained.

[0036] Step 3: Add an appropriate amount of SiC fibers treated in step 1 to the silica sol, impregnate, coat, and dry, and then keep it in a vacuum furnace at a constant temperature of 300~500°C for 1 hour to obtain a uniform SiO on the surface. 2 coated SiC fibers.

[0037] Step 4: Take 322.82g of concentrated phosphoric acid, add deionized water to dilute, and use a 500mL volumetric flask to constant v...

Embodiment 2

[0045] A method for preparing a high-temperature-resistant and anti-oxidation novel interface phase material, comprising the following steps:

[0046] Step 1. Degumming the SiC fiber preform at a temperature of 500-700° C. and nitrogen atmosphere for 0.5-1 hour.

[0047] Step 2. Mix ethyl orthosilicate and absolute ethanol in a ratio of 17:12 by volume under a magnetic heating stirrer, then add the mixture of dilute hydrochloric acid and deionized water drop by drop, and continue to stir at a constant temperature for two Hours, a stable, transparent silica sol was obtained.

[0048] Step 3: Add an appropriate amount of SiC fibers treated in step 1 to the silica sol, impregnate, coat, and dry, and then keep it in a vacuum furnace at a constant temperature of 300~500°C for 1 hour to obtain a uniform SiO on the surface. 2 coated SiC fibers.

[0049] Step 4: Take 322.82g of concentrated phosphoric acid, add deionized water to dilute, and use a 500mL volumetric flask to constant ...

Embodiment 3

[0057] A method for preparing a high-temperature-resistant and anti-oxidation novel interface phase material, comprising the following steps:

[0058] Step 1. Degumming the SiC fiber preform at a temperature of 500-700° C. and nitrogen atmosphere for 0.5-1 hour.

[0059] Step 2. Mix ethyl orthosilicate and absolute ethanol in a ratio of 17:12 by volume under a magnetic heating stirrer, then add the mixture of dilute hydrochloric acid and deionized water drop by drop, and continue to stir at a constant temperature for two Hours, a stable, transparent silica sol was obtained.

[0060] Step 3: Add an appropriate amount of SiC fibers treated in step 1 to the silica sol, impregnate, coat, and dry, and then keep it in a vacuum furnace at a constant temperature of 300~500°C for 1 hour to obtain a uniform SiO on the surface. 2 coated SiC fibers.

[0061] Step 4: Take 322.82g of concentrated phosphoric acid, add deionized water to dilute, and use a 500mL volumetric flask to constant ...

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Abstract

The invention provides a preparation method of a novel interface phase material. The method comprises the following steps: preparing silica sol, preparing a citrate stock solution from RE<3+> soluble nitrate and citric acid, and mixing the citrate stock solution with a phosphoric acid solution to obtain a mixed solution; pretreating SiC fibers; dipping the pretreated SiC fiber in the prepared silica sol, dipping, coating and drying, and then keeping in a vacuum furnace at a constant temperature for 1 hour to obtain the SiC fiber with a SiO2 coating on the surface; putting the SiC fiber with the SiO2 coating into the prepared mixed solution, keeping in a constant-temperature water bath for a period of time, washing, drying, and carrying out first heat treatment under the protection of inert gas to form a rare earth phosphate coating on the surface of the SiO2 coating; and performing secondary heat treatment on the prepared sample under the protection of inert gas to form an interface phase with a rare earth pyrosilicate coating on the surface of the SiC fiber.

Description

technical field [0001] The invention relates to the technical field of preparation of interface phase materials of ceramic matrix composite materials, in particular, relates to a SiC f Preparation method of novel interfacial phase materials in SiC / SiC composites. Background technique [0002] With the continuous improvement of the thrust and thrust-to-weight ratio of aero-engines, the temperature at the front inlet of the turbine needs to be continuously increased, and the superalloy single crystal blades gradually cannot meet the service temperature requirements. SiC f / SiC composite materials have excellent temperature resistance, excellent high temperature oxidation resistance, low density, excellent high temperature mechanical properties and creep resistance, etc., and have gradually become the most promising aero-engine hot-end components currently recognized internationally. one of the candidate materials. For continuous fiber reinforced ceramic matrix composites, i...

Claims

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Application Information

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IPC IPC(8): C04B35/628C04B35/80C04B35/565
CPCC04B35/565C04B35/62849C04B35/62886C04B2235/5244
Inventor 王衍飞张金刘荣军万帆
Owner NAT UNIV OF DEFENSE TECH
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