Preparation method of carbon/carbon composite material silicon carbide/molybdenum-silicon-aluminum coating

A technology of carbon composite material and aluminum coating, which is applied in the field of preparation of carbon/carbon composite material coating, can solve the problems of poor high temperature creep resistance, easy failure of coating, easy volatilization and shedding of oxide film, etc. The effect of temperature, simple preparation method, and small crystal particles

Active Publication Date: 2014-07-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MoSi 2 It has problems such as room temperature brittleness, poor high temperature creep resistance, and easy volatilization and peeling off of the oxide film after oxidation. These defects lead to MoSi 2 The coating is prone to failure during the oxidation protection process

Method used

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  • Preparation method of carbon/carbon composite material silicon carbide/molybdenum-silicon-aluminum coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment is a carbon / carbon composite material SiC / Mo(Si,Al) 2 Coatings, including internal and external coatings. The inner coating is SiC, and its raw materials include 60~80wt.% Si, 10~20wt.% C and 0~20wt.% Al 2 o 3 . The outer layer is Mo(Si,Al) 2 Coating, preparation raw materials include 50~85wt.%Si, 0~30wt.%Mo(Si,Al) 2 And 10~20wt.%C. The raw materials mentioned above are all powders.

[0025] This embodiment also proposes a carbon / carbon composite material SiC / Mo(Si,Al) 2 The preparation method of coating, its specific process is:

[0026] Step 1: Grind and polish the C / C composite material with No. 160 and No. 400 sandpaper respectively, and then clean the C / C composite material sample. The polished C / C composite material was ultrasonically cleaned with absolute ethanol for 30 minutes, and dried in an oven for later use; the drying temperature was 85°C; the ultrasonic power was 100W.

[0027] Step 2, preparing the SiC inner coating, the specific...

Embodiment 2

[0036] This embodiment is a carbon / carbon composite material SiC / Mo(Si,Al) 2 Coatings, including internal and external coatings. The inner coating is SiC, and its raw materials include 60~80wt.% Si, 10~20wt.% C and 0~20wt.% Al 2 o 3 . The outer layer is Mo(Si,Al) 2 Coating, preparation raw materials include 50~85wt.% Si, 0~30wt.% Mo(Si,Al) 2 And 10~20wt.%C. The raw materials mentioned above are all powders.

[0037] This embodiment also proposes a carbon / carbon composite material SiC / Mo(Si,Al) 2 The preparation method of coating, its specific process is:

[0038] Step 1: Grind and polish the C / C composite material with No. 160 and No. 400 sandpaper respectively, and then clean the C / C composite material sample. The polished C / C composite material was ultrasonically cleaned with absolute ethanol for 30 minutes, and dried in an oven for later use; the drying temperature was 85°C; the ultrasonic power was 100W.

[0039] Step 2, preparing the SiC inner coating, the specif...

Embodiment 3

[0048] This embodiment is a carbon / carbon composite material SiC / Mo(Si,Al) 2 Coatings, including internal and external coatings. The inner coating is SiC, and its raw materials include 60~80wt.% Si, 10~20wt.% C and 0~20wt.% Al 2 o 3 . The outer layer is Mo(Si,Al) 2 Coating, preparation raw materials include 50~85wt.% Si, 0~30wt.% Mo(Si,Al) 2 And 10~20wt.%C. The raw materials mentioned above are all powders.

[0049] This embodiment also proposes a carbon / carbon composite material SiC / Mo(Si,Al) 2 The preparation method of coating, its specific process is:

[0050] Step 1: Grind and polish the C / C composite material with No. 160 and No. 400 sandpaper respectively, and then clean the C / C composite material sample. The polished C / C composite material was ultrasonically cleaned with absolute ethanol for 30 minutes, and dried in an oven for later use; the drying temperature was 85°C; the ultrasonic power was 100W.

[0051] Step 2, preparing the SiC inner coating, the specif...

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Abstract

The invention relates to a preparation method of a carbon / carbon composite material silicon carbide / molybdenum-silicon-aluminum coating. The preparation method is characterized in that: the coating is a dual-layer coating; an inner coating is SiC; and an outer coating is Mo(Si,Al). The method comprises the following specific steps of: drying a 2D C / C composite material for later use; preparing a SiC inner coating by using a liquid phase siliconizing method; and preparing a Mo(Si,Al)2 outer coating by using an embedding technology. The SiC inner coating is prepared with an embedding method, so that the thermal stresses of the embedded Mo(Si,Al)2 outer coating and the C / C composite material are reduced, and mismatch of thermal expansion coefficients is relieved; and the preparation method of the SiC / Mo(Si,Al)2 coating is easy and convenient, and is suitable for the C / C composite material. The surface of a SiC / Mo(Si,Al)2 coating sample is dense and continuous, and crystal particles in the coating are relatively small. The coating is dense and continuous, and crystal particles in the coating are relatively small.

Description

technical field [0001] The invention relates to a preparation method of chemical materials, in particular to a preparation method suitable for carbon / carbon (C / C) composite material coating. Background technique [0002] C / C composite material is currently the only structural material that can be used above 1650°C, and it has been widely used in aerospace industry and other fields. However, C / C composites are easily oxidized in a high-temperature aerobic environment (≥450°C), which is the bottleneck of their application to high-temperature thermal structural components, and coating technology is an effective measure to solve the problem of high-temperature easy oxidation of the material. MoSi 2 It has high temperature stability in an oxidizing atmosphere at 1800°C, can be used continuously in air at 1650°C for more than 2,000 hours, and has excellent self-healing properties. It has been widely used in superalloys, refractory metals and C / C composite materials anti-oxidatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/90
Inventor 李贺军李婷史小红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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