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Repair method for surface defects of rhenium/iridium coating for carbon/carbon composites anti-oxidation

A technology of carbon composite materials and repair methods, which is applied in the field of repairing surface defects of rhenium/iridium coatings for anti-oxidation of carbon/carbon composite materials, and can solve problems such as external thermal and mechanical effects that are difficult to coordinate, phase interface cracks and pores, etc. , to achieve the effects of dense and uniform cost, uniform surface potential, high melting point and corrosion resistance

Active Publication Date: 2016-04-27
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both carbon fiber and matrix carbon are anisotropic. At the same time, because the distribution of carbon fiber and matrix carbon in composite materials always has orientation, not random distribution, it is difficult to coordinate the external thermal and mechanical effects between phases and phases. Defects such as cracks and pores at the interface

Method used

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  • Repair method for surface defects of rhenium/iridium coating for carbon/carbon composites anti-oxidation
  • Repair method for surface defects of rhenium/iridium coating for carbon/carbon composites anti-oxidation
  • Repair method for surface defects of rhenium/iridium coating for carbon/carbon composites anti-oxidation

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Experimental program
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Embodiment 1

[0036] A method for repairing surface defects of the rhenium / iridium coating for anti-oxidation of carbon / carbon composite materials of the present invention, comprising the following steps:

[0037] (1) The carbon / carbon composite material used in the experiment was smoothed with No. 600 and No. 800 sandpaper, polished with metallographic sandpaper, polished, and dried with cold air; then it was placed in a vacuum tube furnace for high-temperature vacuum degassing treatment, and the treatment temperature was 1200℃, the vacuum degree is better than 4×10 -2Pa, the treatment time is 1 hour, and the carbon / carbon composite matrix is ​​obtained. Place the carbon / carbon composite material substrate in the deposition chamber of chemical vapor deposition for heating, and transport the rhenium pentachloride vapor to the surface of the carbon / carbon composite material substrate heated to 1200°C through Ar gas, and the rhenium pentachloride is heated at 1200°C A thermal decomposition r...

Embodiment 2

[0043] A method for repairing surface defects of the rhenium / iridium coating for anti-oxidation of carbon / carbon composite materials of the present invention, comprising the following steps:

[0044] (1) The carbon / carbon composite material used in the experiment was smoothed with No. 600 and No. 800 sandpaper, polished with metallographic sandpaper, polished, and dried with cold air; then it was placed in a vacuum tube furnace for high-temperature vacuum degassing treatment, and the treatment temperature was 1200℃, the vacuum degree is better than 4×10 -2 Pa, the treatment time is 1 hour, and the carbon / carbon composite matrix is ​​obtained. Place the carbon / carbon composite material substrate in the deposition chamber of chemical vapor deposition and heat it to 1150°C, transport the rhenium pentachloride vapor to the surface of the carbon / carbon composite material substrate through Ar gas, and the rhenium pentachloride will generate heat at 1150°C A layer of rhenium coating...

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Abstract

The invention discloses a method for repairing surface defects of a rhenium / iridium coating for anti-oxidation of a carbon / carbon composite material. The repair method comprises dipping and brushing a saturated soluble cobalt salt solution on the carbon / carbon composite material with a rhenium coating A cobalt compound layer is formed, and the cobalt compound layer is reduced by hydrogen to form a metal cobalt layer, and the obtained carbon / carbon composite material with a metal cobalt layer and a rhenium coating is placed in an Ar gas atmosphere for high-temperature treatment to melt the metal cobalt and bridge the rhenium Defects on the surface of the coating and solid solution with rhenium to form a rhenium / cobalt alloy coating, then deposit a rhenium coating on the rhenium / cobalt alloy coating, and then deposit an iridium coating on the rhenium coating to obtain a rhenium / cobalt alloy coating with defects repaired Iridium-coated carbon / carbon composite. The repairing method of the present invention has the advantages of simple and controllable process, simple equipment and low cost, and the repairing method can prepare a dense and complete rhenium / iridium coating on the carbon / carbon composite material without cracks and holes.

Description

technical field [0001] The invention relates to the technical field of surface coatings, in particular to a method for repairing surface defects of rhenium / iridium coatings for anti-oxidation of carbon / carbon composite materials. technical background [0002] Carbon / carbon composite material is a composite structure composed of carbon fiber reinforced phase and carbon matrix phase, with low density, high strength, low ablation rate, high thermal shock resistance, low thermal expansion coefficient, zero humidity expansion, within 2000 ℃ Strength and modulus increase with temperature, good fatigue resistance, excellent friction and wear properties, insensitivity to cosmic radiation, and increased strength under nuclear radiation, making it widely used in many fields. However, carbon / carbon composites have poor oxidation resistance in high-temperature aerobic environments. Oxidation reduces the physical and mechanical properties of carbon / carbon composites, which greatly limits...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/02C23C16/14C25D3/66C23C10/20
Inventor 叶益聪白书欣张虹黄永乐朱利安仝永刚
Owner NAT UNIV OF DEFENSE TECH