Method for preparing ZrB2-SiC anti-ablation coating from in-situ reaction

An in-situ reaction, zrb2-sic technology, applied in the field of preparation of ZrB2-SiC ablation resistant coatings on the surface of carbon/carbon (C/C) composite materials, can solve the problems of uncontrollable performance, uneven distribution, coating and substrate Problems such as poor bonding performance to achieve the effect of improving ablation resistance and high bonding strength

Active Publication Date: 2013-06-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the study used the slurry brushing method to prepare ZrB 2 -SiC coating, so the bonding performance between the coating and the substrate is poor, and the distribution is uneven, and the performance is uncontrollable

Method used

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  • Method for preparing ZrB2-SiC anti-ablation coating from in-situ reaction
  • Method for preparing ZrB2-SiC anti-ablation coating from in-situ reaction
  • Method for preparing ZrB2-SiC anti-ablation coating from in-situ reaction

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Experimental program
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Effect test

Embodiment 1

[0022] Step 1, pretreat the C / C composite material sample; the density obtained by the isothermal chemical vapor infiltration method is 1.67-1.76g / cm 3 The carbon / carbon composite material, after processing it to the size of Φ30mm×10mm, use 400 # Sandpaper to polish. The polished C / C composites were ultrasonically cleaned with tap water in turn, and air-dried. When cleaning, the ultrasonic frequency used is 40KH Z , the ultrasonic power is 100W, and the cleaning time is 15min;

[0023] Step 2, prepare a SiC transition layer on the surface of the C / C composite material; weigh 30g of Si powder, 6g of C powder and 3g of Al 2 o 3 pink. Place in a turpentine ball mill jar, take different numbers of agate balls with different diameters into the rosin ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 2 hours, and use it as a powder for later use. Put the powder into the graphite crucible, then place the dried C / C composite material sample...

Embodiment 2

[0027] Step 1, pretreat the C / C composite material sample; the density obtained by the isothermal chemical vapor infiltration method is 1.67-1.76g / cm 3 The carbon / carbon composite material, after processing it to the size of Φ30mm×10mm, use 800 # Sandpaper to polish. The polished C / C composites were ultrasonically cleaned with tap acetone in turn, and air-dried. When cleaning, the ultrasonic frequency used is 40KH Z , the ultrasonic power is 100W, and the cleaning time is 15min.

[0028] Step 2, prepare a SiC transition layer on the surface of the C / C composite material; weigh 30g of Si powder, 6g of C powder and 2g of Al 2 o 3 pink. Place in a turpentine ball mill jar, take different numbers of agate balls with different diameters into the rosin ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 2 hours, and use it as a powder for later use. Put the powder into the graphite crucible, then place the dried C / C composite material samp...

Embodiment 3

[0032] Step 1, pretreat the C / C composite material sample; the density obtained by the isothermal chemical vapor infiltration method is 1.67-1.76g / cm 3 The carbon / carbon composite material, after processing it to the size of Φ30mm×10mm, use 1500 # Sandpaper to polish. The polished C / C composites were ultrasonically cleaned with tap absolute ethanol in turn; air-dried. When cleaning, the ultrasonic frequency used is 40KH Z , the ultrasonic power is 100W, and the cleaning time is 15min.

[0033] Step 2, prepare a SiC transition layer on the surface of the C / C composite material; weigh 30g of Si powder, 5g of C powder and 3g of Al 2 o 3 pink. Place in a turpentine ball mill jar, take different numbers of agate balls with different diameters into the rosin ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 2 hours, and use it as a powder for later use. Put the powder into the graphite crucible, then place the dried C / C composite materia...

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Abstract

The invention relates to a method for preparing a ZrB2-SiC anti-ablation coating from in-situ reaction. The method is characterized in that the ZrB2-SiC anti-ablation coating is prepared from in-situ reaction on the surface of a C / C composite material with a SiC transit layer. Compared with the prior art, the ZrB2 content in the coating is increased, and therefore the anti-ablation property of the C / C composite material is improved; and moreover as the method adopts high-temperature in-situ reaction, high interface bonding strength of the coating and a substrate is achieved.

Description

technical field [0001] The invention relates to an in-situ reaction for preparing ZrB 2 - A method of SiC anti-ablation coating, especially related to the preparation of ZrB on the surface of carbon / carbon (C / C) composite materials with SiC inner coating 2 - Method of SiC anti-ablative coating. Background technique [0002] C / C composite materials have been developed from a single ablation heat-resistant material to a dual-functional composite material that is both a structural material and a heat-resistant material since its creation to the present, and has been widely used in the aerospace field. It has become an ideal thermal protection candidate material for extreme environments such as hypersonic long-duration flight, atmospheric re-entry, trans-atmospheric flight and rocket propulsion system, and has been highly valued by various countries. However, with the emergence of a new generation of spacecraft, higher flight Mach numbers, engine specific impulses, and combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
Inventor 付前刚邹旭李贺军褚衍辉谷彩阁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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