Heat Insulation Performance of Functionally Graded Metal/Ceramic Coatings and Fracture Behavior under High Heat Flux

Different coating technologies, such as plasma spray (PS), physical vapor deposition (PVD) and chemical vapor deposition (CVD), which can fabricate the PFM and join it to heat sink materials simultaneously, were applied for the fabrication of plasma facing materials (PFM) in fusion reactor. In the Institute of Nuclear Materials, University of Science and Technology Beijing (USTB), the concept of functionally graded materials (FGM) was adopted to fabricate coatings for effectively alleviating the thermal stress generated between coatings and the substrate materials under high heat flux loading (5~20 MW/m2). In the last several years, functionally graded coatings, including B4C/Cu, W/Cu and Mo/Cu systems were successfully fabricated by atmospheric plasma spray (APS). Characterization of coatings was performed in order to assess microstructure, mechanical properties and high heat flux properties of the FGM coatings. Furthermore, a high thick tungsten coating with 4 mm on copper – chromium - zirconium (Cu, Cr, Zr) alloy substrates was fabricated by APS. The porosity of the coating is less than 2% while mean tensile strength of the coating is about 7 MPa. However, the content of oxygen in the coating is about 6 wt% by energy dispersive spectrum (EDS) analysis, thus further optimization is necessary.

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Effect of High Heat Flux Irradiation by High Power CO2Laser on Fatigue Characteristics and Fracture Behavior of Stainless Steel

Journal of Nuclear Science and Technology ◽

10.1080/18811248.1990.9731264 ◽

1990 ◽

Vol 27 (9) ◽

pp. 862-869 ◽

Cited By ~ 1

Author(s):

Tokuo TERAMOTO ◽

Masakatsu SAITO ◽

Satoshi SUZUKI

Keyword(s):

Heat Flux ◽

Stainless Steel ◽

High Power ◽

Fracture Behavior ◽

High Heat ◽

High Heat Flux ◽

Fatigue Characteristics

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The Recent Progress of FGM on Nuclear Materials - Design and Fabrication of W/Cu Functionally Graded Material High Heat Flux Components for Fusion Reactor

Materials Science Forum ◽

10.4028/www.scientific.net/msf.631-632.353 ◽

2009 ◽

Vol 631-632 ◽

pp. 353-358 ◽

Cited By ~ 2

Author(s):

Zhang Jian Zhou ◽

Yong Jin Yum ◽

Chang Chun Ge

Keyword(s):

Heat Flux ◽

Functionally Graded Material ◽

High Heat ◽

Functionally Graded ◽

High Heat Flux ◽

Element Analysis ◽

Thermally Induced ◽

Operation Conditions ◽

Graded Material ◽

Graded Structures

Two kinds of W/Cu functionally graded material based high heat flux components, including monoblock concept and flat tile concept, are designed and fabricated. Thermally induced stresses and strains under operation conditions in these components are analyzed using finite element analysis. The effect on stress and strain of using different graded structures to join Cu to W is examined and compared. There has no obvious difference on operation thermal stress mitigating between monoblock design and flat tile design. The component with monoblock concept was fabricated by a one step fast resistance sintering, and the component with flat tile concept was fabricated by infiltration-welding method successfully.

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Ablation Behaviors of ZrC-20vol.%MoSi2 Composite Coating under Different Heat Fluxes

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.281.516 ◽

2018 ◽

Vol 281 ◽

pp. 516-521

Author(s):

Tao Liu ◽

Ya Ran Niu ◽

Chong Li ◽

Li Ping Huang ◽

Xue Bin Zheng ◽

...

Keyword(s):

Heat Flux ◽

Composite Coating ◽

Ceramic Coatings ◽

High Heat ◽

Heat Fluxes ◽

Vacuum Plasma Spray ◽

High Heat Flux ◽

Plasma Flame ◽

Burst Event ◽

Ablation Resistance

ZrC-20vol.%MoSi2 (ZM) composite coating was fabricated by vacuum plasma spray and the ablation resistance was assessed using plasma flame under low (1.94 MW/m2) and high (3.01 MW/m2) heat fluxes, respectively. Results showed that the ultimate surface temperatures of ZM coating were about 2100 °C and 2400 °C, respectively. ZM coating exhibited good ablation resistance at low heat flux, which benefited from the low evaporation of SiO2 and the diffusion of Si derived from MoSi2 decomposition. However, bubble-burst event took place under high heat flux. The different ablation behaviors of ZrC-MoSi2 coating were analyzed, which might contribute to the application of ultra-high temperature ceramic coatings.

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