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Preparation of carbon/carbon composite material molybdenum disilicide outer coating

A carbon composite material, molybdenum disilicide technology, applied in the field of preparation of molybdenum disilicide outer coating, can solve the problems of high reaction temperature, easy peeling off of the coating, complex structure, etc., and achieve dense and uniform structure, short reaction cycle, internal The effect of less stress

Inactive Publication Date: 2009-04-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yan Zhi-Qiao et al. used the chemical vapor deposition method combined with the slurry coating method to prepare the Si-Mo-SiC composite coating. The chemical vapor deposition preparation coating has a long experimental period and a high reaction temperature, which is easy to damage the C / C composite material. Substrate properties, and the bonding force between the coating and the substrate is weak, and the coating is easy to fall off under the influence of factors such as thermal stress
The multi-phase coating has too many layers and complex structure, which greatly reduces the repeatability and reliability of the preparation process [Yan Zhi-Qiao, Xiong Xiang * , XiaoPeng, Chen Feng, Zhang Hong-Bo, Huang Bai-Yun.Carbon.2008, 46.]

Method used

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  • Preparation of carbon/carbon composite material molybdenum disilicide outer coating
  • Preparation of carbon/carbon composite material molybdenum disilicide outer coating
  • Preparation of carbon/carbon composite material molybdenum disilicide outer coating

Examples

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Effect test

Embodiment 1

[0016] Example 1: Select commercially available molybdenum disilicide powder with an average particle size of 180 meshes, elemental iodine with a purity ≥ 99.7%, and isopropanol with a purity ≥ 99.8% as raw materials: first wet the molybdenum disilicide powder after ball milling for 10 hours Add 1g into the Erlenmeyer flask, then pour 250ml of isopropanol into the Erlenmeyer flask to obtain a suspension, then put the suspension into a 300W ultrasonic generator and vibrate for 30min, then stir on a magnetic stirrer for 12h to obtain suspension A Add 0.05g of iodine elemental substance to the suspension A, put it into a 300W ultrasonic generator and vibrate for 30min, take it out and stir it on a magnetic stirrer for 12h to make solution B; pour the above solution B into the hydrothermal reaction kettle , the filling degree is controlled at 70%; then the carbon / carbon composite material sample with SiC inner coating is clamped on the cathode clamp in the hydrothermal kettle, and ...

Embodiment 2

[0017] Example 2: Select commercially available molybdenum disilicide powder with an average particle size of 180 meshes, elemental iodine with a purity ≥ 99.7%, and isopropanol with a purity ≥ 99.8% as raw materials: first wet the molybdenum disilicide powder after ball milling for 20 hours Add 2g into the Erlenmeyer flask, then pour 200ml of isopropanol into the Erlenmeyer flask to obtain a suspension, then put the suspension into a 250W ultrasonic generator and vibrate for 50min, then stir on a magnetic stirrer for 16h to obtain suspension A ; Add 0.2g of iodine elemental substance to the suspension A, put it into a 250W ultrasonic generator and vibrate for 50min, take it out and stir it on a magnetic stirrer for 16h to obtain a solution B; pour the above solution B into a hydrothermal reaction kettle , the filling degree is controlled at 65%; then the carbon / carbon composite material sample with SiC inner coating is clamped on the cathode clamp in the hydrothermal kettle, a...

Embodiment 3

[0018] Example 3: Select commercially available molybdenum disilicide powder with an average particle size of 180 meshes, elemental iodine with a purity ≥ 99.7%, and isopropanol with a purity ≥ 99.8% as raw materials: first, molybdenum disilicide powder after wet ball milling for 30 hours Add 5g into the Erlenmeyer flask, then pour 150ml of isopropanol into the Erlenmeyer flask to obtain a suspension, then put the suspension into a 230W ultrasonic generator and vibrate for 40min, then stir on a magnetic stirrer for 20h to obtain suspension A ; Add 0.1g of iodine elemental substance to the suspension A, put it into a 230W ultrasonic generator and vibrate for 40min, take it out and put it on a magnetic stirrer to stir for 20h to obtain a solution B; pour the above solution B into a hydrothermal reaction kettle In the process, the filling degree is controlled at 72%; then the carbon / carbon composite material sample with SiC inner coating is clamped on the cathode clamp in the hydr...

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Abstract

The invention relates to a preparation method of a carbon / carbon composite material molybdenum disilicide external coating, which comprises the following steps: the ball-milled molybdenum disilicide powder and isopropanol are mixed in a supersonic generator and vibrated; suspending liquid A is obtained after magnetic stirring; iodine is added to the suspending liquid A and vibrated in the supersonic generator; solution B is obtained after magnetic stirring; the solution B is poured into a hydro-thermal reaction kettle; a carbon / carbon composite material sample with a SiC internal coating is clamped on a cathode clamp inside the hydro-thermal kettle; the hydro-thermal kettle is put in an oven; after the hydrothermal electrophoresis is finished, the sample is cooled to room temperature; and the sample is taken out and dried to obtain the final product, i.e., the carbon / carbon composite material with the protection of the molybdenum disilicide external coating and a carborundum internal coating. The adoption of the hydrothermal electrophoresis precipitation method can prepare the external coating with uniform thickness and without penetrating crackles and millipores. As the reaction is finished in the hydro-thermal kettle once without post heat treatment and carried out at low temperature, the base material is not damaged, the obtained molybdenum disilicide external coating has small internal stress and compact and uniform structure.

Description

technical field [0001] The invention relates to a preparation method of a molybdenum disilicide outer coating, in particular to a preparation method of a carbon / carbon composite material molybdenum disilicide outer coating. Background technique [0002] In recent years, carbon / carbon composites (C / C) have gradually become a research hotspot. Due to the advantages of carbon / carbon composite materials such as low thermal expansion coefficient, low density, ablation resistance, corrosion resistance, good friction, good thermal and electrical conductivity, high strength, and high modulus, especially the mechanical properties do not decrease but increase with the increase of temperature. Therefore, it is widely used in the fields of aviation, aerospace and civil industry. However, many of its above-mentioned properties can only be maintained in an inert atmosphere or below 370°C, and the oxidation weight loss will significantly reduce the mechanical properties of carbon / carbon c...

Claims

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Application Information

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IPC IPC(8): C04B41/85
Inventor 黄剑锋王博刘淼曹丽云
Owner SHAANXI UNIV OF SCI & TECH
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