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A kind of preparation method of novel interfacial phase material

A technology of interfacial phase and composite materials, which is applied in the field of preparation of new interfacial phase materials, can solve the problems of poor oxidation resistance and inability to apply high-temperature water vapor and high-speed gas environments, etc., to achieve extended service life and good high temperature and oxidation resistance. Effect

Active Publication Date: 2021-10-01
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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  • A kind of preparation method of novel interfacial phase material
  • A kind of preparation method of novel interfacial phase material
  • A kind of preparation method of novel interfacial phase material

Examples

Experimental program
Comparison scheme
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, comprising: preparing silica sol, and using RE 3+ Soluble nitrate and citric acid were used to prepare a citrate stock solution, and the citrate stock solution and phosphoric acid solution were mixed to obtain a mixed solution; the SiC fiber was pretreated; the pretreated SiC fiber was immersed in the prepared silica sol, and passed After impregnation, coating, and drying, keep the temperature in a vacuum furnace for 1 hour to obtain a surface with SiO 2 Coated SiC fibers; will have SiO 2 The coated SiC fiber is placed in the prepared mixed solution, kept in a constant temperature water bath for a period of time, washed, dried, and subjected to the first heat treatment under the protection of an inert gas. 2 A rare earth phosphate coating is formed on the surface of the coating; then the prepared sample is subjected to a second heat treatment under the protection of an 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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Patent Type & Authority Patents(China)
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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