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C/C composite material surface antioxidation ZrSi2-Y2O3/SiC composite coating and preparation method thereof

A technology of zrsi2-y2o3 and composite materials, which is applied in the field of coating preparation, can solve problems such as coating cracks and pores that are difficult to heal, high coating interface bonding force, coating weight loss, etc., to improve the oxidation resistance of the coating, The effect of good coating compactness

Active Publication Date: 2018-02-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] C / C composite materials have excellent mechanical properties and become the most ideal high-temperature thermal structural materials, but their easy oxidation in high-temperature aerobic environments limits its application range, and the use of external coating technology has become the most effective method
SAPS technology is one of the efficient coating preparation methods developed in recent years. Its plasma arc temperature can reach 10,000°C. It can prepare ultra-high and high melting point ceramic coatings, and the prepared coatings have high interfacial bonding force. A few cracks and porosity will appear in the coating
At present, the external coating is mainly based on the glass phase SiO produced by the oxidation of silicon-based phase ceramics at high temperature. 2 Can heal coating microcracks and micropores to improve oxidation performance, but glassy SiO 2 Volatilization will occur at 1500°C, and cracks in the coating will expand at high temperatures, resulting in SiO 2 The glass phase is limited and cannot heal all the micro-cracks and pores of the coating, thus providing channels for oxygen, which eventually leads to the failure of the coating's oxidation performance
The oxidation resistance of the anti-oxidation coating prepared by the SAPS method at present is still not ideal at 1500 °C
[0003] Document 1 "A ZrB2–SiC / SiC oxidation protective dual-layer coating forcarbon / carbon composites, Shanbao Zhou, Yushi Qi, Peng Wang, Yehong Cheng and Wenbo Han, Advances in Applied Ceramics, 2017:1-6." pointed out that ZrB2- The oxidation time of SiC coating at 1500℃ is 18h, the weight loss of the coating is 1.8%, and the oxidation product SiO produced in the coating 2 One part volatilizes, the other part and the oxidation product ZrO 2 react to form ZrSiO 4 ,ZrSiO 4 Can effectively improve the oxidation resistance of the coating, but due to the coating SiO 2 With the continuous reduction of content, the cracks and pores in the final coating are difficult to heal and lead to failure

Method used

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  • C/C composite material surface antioxidation ZrSi2-Y2O3/SiC composite coating and preparation method thereof
  • C/C composite material surface antioxidation ZrSi2-Y2O3/SiC composite coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] 1. Preparation of inner coating SiC:

[0028] Step 1: Polish the C / C composite material with sandpaper, ultrasonically clean it with absolute ethanol for 30 minutes, and then dry it in an oven at 120°C for 1 hour;

[0029] Step 2: Combine 75g Si powder, 15g C powder and 10g Al 2 o 3The powders were mixed and placed in a resin ball mill jar, mixed for 3 hours to obtain embedding powders, and the C / C composite material was embedded in the blended powders in a graphite crucible, and the graphite crucible was placed in a high-temperature graphitization heat treatment furnace with argon as the The protective gas was used to raise the temperature to 1900°C at a rate of 10°C / min, keep the temperature for 2 hours, turn off the power and naturally cool to room temperature to obtain a C / C composite material protected by SiC coating.

[0030] 2. Prepare powder for spraying by spray drying method:

[0031] Step 1: Mix 85g ZrSi 2 and 15gY 2 o 3 The powder is mixed with a plane...

Embodiment 2

[0038] 1. Preparation of inner coating SiC:

[0039] Step 1: Polish the C / C composite material with sandpaper, ultrasonically clean it with absolute ethanol for 30 minutes, and then dry it in an oven at 120°C for 1.5 hours;

[0040] Step 2: Mix 70g Si powder, 15g C powder and 15g Al 2 o 3 The powders were mixed and placed in a resin ball mill jar, mixed for 3 hours to obtain embedding powders, and the C / C composite material was embedded in the blended powders in a graphite crucible, and the graphite crucible was placed in a high-temperature graphitization heat treatment furnace with argon as the The protective gas was used to raise the temperature to 2000°C at a rate of 10°C / min, keep the temperature for 1.5h, turn off the power and naturally cool to room temperature to obtain a C / C composite material protected by SiC coating.

[0041] 2. Prepare powder for spraying by spray drying method:

[0042] Step 1: Mix 75g ZrSi 2 and 25gY 2 o 3 The powder is mixed with a planetar...

Embodiment 3

[0049] 1. Preparation of inner coating SiC:

[0050] Step 1: Polish the C / C composite material with sandpaper, ultrasonically clean it with absolute ethanol for 30 minutes, and then dry it in an oven at 120°C;

[0051] Step 2: Combine 80g Si powder, 15g C powder and 5g Al 2 o 3 The powders were mixed and placed in a resin ball mill jar, mixed for 3 hours to obtain embedding powders, and the C / C composite material was embedded in the blended powders in a graphite crucible, and the graphite crucible was placed in a high-temperature graphitization heat treatment furnace with argon as the The protective gas was used to raise the temperature to 2100°C at a rate of 10°C / min, hold the temperature for 1 hour, turn off the power and naturally cool to room temperature to obtain a C / C composite material protected by SiC coating.

[0052] 2. Prepare powder for spraying by spray drying method:

[0053] Step 1: Add 90g ZrSi 2 and 10gY 2 o 3 The powder is mixed with a planetary ball mi...

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Abstract

The invention relates to a C / C composite material surface antioxidation ZrSi2-Y2O3 / SiC composite coating and a preparation method thereof. An SiC inner coating and a ZrSi2-Y2O3 composite ceramic outercoating are prepared by an embedding method and an SAPS (supersonic plasma spraying) two-step method. The SiC inner coating and the ZrSi2-Y2O3 composite ceramic outer coating are prepared by the embedding and SAPS two-step method. The C / C composite material surface antioxidation ZrSi2-Y2O3 / SiC composite coating is characterized in that the outer coating is prepared from the following ingredientsin percentage by mass: 70 to 95 percent of ZrSi2 and 5 to 30 percent of Y2O3. When the prepared antioxidation coating is at 1500 DEG C, the SiO2 liquid glass phase generated by ZrSi2 can heal coatingmicrocracks; after the Y2O3 is added, the Y2O3 and the ZrO2 react to form a solid solution; the volatilization of SiO2 glass phases is retarded; the prepared coating has good compactness; after 1500 DEG C high-temperature static oxidation for 150 to 280h, the coating maintains the weight increase.

Description

technical field [0001] The invention belongs to coating preparation technology, and relates to a long-term anti-oxidation ZrSi on the surface of a C / C composite material 2 -Y 2 o 3 / SiC composite coating and preparation method thereof. Background technique [0002] C / C composites have excellent mechanical properties and become the most ideal high-temperature thermal structural materials, but their easy oxidation in high-temperature aerobic environments limits their application range, and external coating technology has become the most effective method. SAPS technology is one of the efficient coating preparation methods developed in recent years. Its plasma arc temperature can reach 10,000°C. It can prepare ultra-high and high melting point ceramic coatings, and the prepared coatings have high interfacial bonding force. A small amount of cracks and porosity will appear in the coating. At present, the external coating is mainly based on the glass phase SiO produced by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B26/04C04B41/52
CPCC04B26/04C04B35/565C04B35/62222C04B41/522C04B14/32C04B14/30
Inventor 李贺军刘菲姚西媛付前刚
Owner NORTHWESTERN POLYTECHNICAL UNIV