Carbon-base tungsten coating and its preparation method

A coating and carbon-based technology, which is applied in the field of carbon-based tungsten coating and its preparation, can solve problems such as low density and purity, accumulation of impurity ash, poor bonding force of grain boundary strength, etc., achieve fast deposition speed, improve efficiency, The effect of surface densification

Inactive Publication Date: 2011-04-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical vapor deposition and chemical vapor deposition coatings not only have high density and purity, but also have a columnar grain structure perpendicular to the surface, which is beneficial for high heat flow components, but its high density is not conducive to stress release, cracks Once formed will be easy to expand
Plasma spraying has the advantages of simple process, low cost, not limited by the shape of the workpiece, and excellent high thermal load performance. Its disadvantages are low density and purity, poor grain boundary strength and bonding force between sprayed particles. The same large particle emission as brittle carbon and carbon-based materials occurs under transient high thermal loads, leading to severe material corrosion and accumulation of harmful impurity ash in the plasma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Choose carbon / carbon composite material as the substrate, and set the process parameters for depositing tungsten coating by double-layer glow ion metallization technology: source voltage 950V, cathode voltage 500V, air pressure 50Pa, spacing 15mm, duty cycle 0.8, deposition time 4h. Treat the surface of the carbon / carbon composite material with crystal phase sandpaper and ultrasonically clean it, then dry it and put it on the cathode of the double-glow furnace, vacuumize and feed argon, adjust the cathode voltage to 350V and heat and clean the carbon / carbon composite material matrix for 0.5 hours . Turn on the furnace, put the tungsten plate on the source of the double-glow furnace, close the furnace, evacuate and inject argon gas, and follow the set double-layer glow ion infiltration metal process parameters (including source voltage, cathode voltage, air pressure, pole voltage, etc.) spacing, duty cycle, deposition time) to deposit the tungsten coating; heat-treat th...

Embodiment 2

[0015] Graphite was selected as the substrate, and the process parameters of tungsten coating deposited by double-layer glow ion metallization technology were set: source voltage 950V, cathode voltage 450V, air pressure 40Pa, electrode spacing 10mm, duty cycle 0.6, deposition time 6h. Treat the graphite surface with crystal phase sandpaper and ultrasonically clean it, then dry it and place it on the cathode of a double-glow furnace, vacuumize and feed argon, adjust the cathode voltage to 300V and heat and clean the graphite substrate for 1 hour. Turn on the furnace, put the tungsten plate on the source of the double-glow furnace, close the furnace, evacuate the argon gas, and follow the set double-layer glow ionization metal permeation process parameters (including source voltage, cathode voltage, air pressure, spacing, duty cycle, deposition time) for the deposition of tungsten coating. The prepared carbon-based tungsten coating was heat-treated at 1200° C. for 0.5 hours.

Embodiment 3

[0017] Carbon / carbon composite material is selected as the substrate, and the process parameters for depositing tungsten coating by double-layer glow ion metallization technology are set: source voltage 850V, cathode voltage 550V, air pressure 50Pa, electrode spacing 20mm, duty cycle 0.8, deposition Time 2h. Treat the surface of the carbon / carbon composite material with crystal phase sandpaper and ultrasonically clean it, then dry it and put it on the cathode of the double-glow furnace, vacuumize and feed argon, adjust the cathode voltage to 350V and heat and clean the carbon / carbon composite material matrix for 1.5h . Turn on the furnace, put the tungsten plate on the source of the double-glow furnace, close the furnace, evacuate the argon gas, and follow the set double-layer glow ionization metal permeation process parameters (including source voltage, cathode voltage, air pressure, spacing, duty cycle, deposition time) to deposit the tungsten coating; heat-treat the prepar...

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PUM

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Abstract

The composite material comprising one C substrate and one homogeneous compact W coating attached firmly on the C substrate. The C substrate is preferably of composite C / C material or graphite, and the W coating is formed through deposition with purified W plate as target. The present invention has the advantages of high W coating depositing speed, complete coating of all surfaces of C substrate with W coating formed by high density plasma cloud between the W target and the C substrate, compact W coating without crack, and well combination between the W coating and the C substrate.

Description

technical field [0001] The invention relates to a tungsten coating and a preparation method thereof, in particular to a carbon-based tungsten coating and a preparation method thereof. Background technique [0002] Due to its high melting point, excellent thermal conductivity, low sputtering yield and high self-sputtering threshold, as well as low vapor pressure and low tritium retention performance, tungsten is considered to be the most promising plasma-facing wall for future fusion reactors. Material. But tungsten and its alloys are very heavy and difficult to process, so light element materials, such as tungsten coatings on carbon materials, are widely used by fusion scientists around the world. The tungsten-coated restrictor and divertor protection plate tests were carried out on ASDEX-U and TEXTOR tokamak devices, and the first large-area W / C wall tile test was also carried out on ASDEX-U. The test found that tungsten and plasma There is good compatibility between bodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00C23C14/18C23C14/02C23C14/22C23C14/54
Inventor 陈照峰张颖王亮兵吴王平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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