Method for preparing UHTC (Ultra-High Temperature Ceramic) matrix composite material through modification of UHTC powder basal body

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of preparation of ultra-high temperature ceramic matrix composite materials, can solve problems such as fiber erosion, material mechanical properties and poor ablation performance, achieve uniform distribution, improve ablation resistance, and ensure The effect of mechanical properties

Inactive Publication Date: 2013-04-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problems of poor mechanical properties and ablation properties of materials in the prior art due to weak matrix bonding caused by slurry coating and fiber erosion caused by RMI

Method used

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  • Method for preparing UHTC (Ultra-High Temperature Ceramic) matrix composite material through modification of UHTC powder basal body
  • Method for preparing UHTC (Ultra-High Temperature Ceramic) matrix composite material through modification of UHTC powder basal body

Examples

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Effect test

example 1

[0021] Step 1: Preparation of composite material preform: Clean the C / SiC composite material preform with an open porosity of 30vol%-40vol% with ultrasonic waves for at least 30 minutes, and dry it in an oven at 80℃-100℃ for later use.

[0022] Step 2: Slurry Preparation: ZrB 2 Slurry A was prepared by adding 0.5%-1% mass fraction of sodium cellulose (CMC) aqueous solution to the powder and ball milling for more than 24 hours. Slurry B was prepared by dissolving phenolic resin and hexamethylenetetramine in absolute alcohol in a mass ratio of 10:1. The viscosity of the above slurry is controlled by the content of anhydrous alcohol or aqueous solution to about 60 mPa·s, and the dispersibility is controlled by adjusting the pH value (greater than 11).

[0023] Step 3: Vacuum pressure impregnation: the C / SiC preform of step 1 is first vacuum impregnated with slurry A for about 30 minutes, then pressurized to 0.8MPa pressure by inert gas to impregnate slurry A for about 30 minutes...

example 2

[0027] Step 1: Preparation of composite material preform: Clean the C / SiC composite material preform with an open porosity of 30vol%-40vol% with ultrasonic waves for at least 30 minutes, and dry it in an oven at 80℃-100℃ for later use.

[0028] Step 2: Slurry preparation: Add ZrC powder to a 0.5%-1% mass fraction of sodium cellulose (CMC) aqueous solution and ball mill for more than 24 hours to prepare slurry A. Slurry B was prepared by dissolving polycarbosilane (PCS) in absolute alcohol. The viscosity of the above slurry is controlled by the content of anhydrous alcohol or aqueous solution to about 60 mPa·s, and the dispersibility is controlled by adjusting the pH value (greater than 11).

[0029]Step 3: Vacuum pressure impregnation: the C / SiC preform of step 1 is first vacuum impregnated with slurry A for about 30 minutes, then pressurized to 0.8MPa pressure by inert gas to impregnate slurry A for about 30 minutes and dry, repeat the impregnation and drying 3-4 times, a su...

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Abstract

The invention discloses a method for preparing an UHTC (Ultra-High Temperature Ceramic) matrix composite material through modification of a UHTC powder basal body. The method comprises the steps of: introducing UHTC powder and a carbon organic precursor into C/SiC with a gas hole ratio of 30 vol% to 40 vol% by adopting a vacuum pressure impregnation way; and performing in-situ reaction on melting silicon and splitting carbon in the basal body, and compacting the material through the combination of RMI (Reactive Melt Infiltration) so as to prepare a C/SiC-UHTC composite material. For one aspect, the SiC basal body protects fibers from being eroded by the melting silicon so as to improve mechanical properties of the material as the C/SiC with the gas hole ratio of 30 vol% to 40 vol% is adopted as a prefabricated body; and for the other aspect, a certain amount of the UHTC powder is introduced into the prefabricated body to improve anti-ablation performances.

Description

technical field [0001] The invention relates to a preparation method of an ultra-high temperature ceramic matrix composite material, in particular to a method for modifying the ablation resistance matrix of a C / SiC ceramic matrix composite material by ultra-high temperature ceramic powder (UHTC). Background technique [0002] Continuous carbon fiber toughened silicon carbide ceramic matrix composite (C / SiC) is an ideal high temperature structural material with a series of advantages such as high temperature resistance, low density, high strength, thermal shock resistance, etc. It has a wide range of applications and prospects in the fields of aircraft thermal protection systems and rocket engine nozzles. SiO is formed on the surface of the material due to passive oxidation of the SiC matrix below 1700°C 2 Layer protection material; C / SiC structural composite material can be used for a long time under the temperature condition of less than 1700℃. The temperature of the hot-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
Inventor 范尚武王一光皮慧龙成来飞张立同
Owner NORTHWESTERN POLYTECHNICAL UNIV
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