Abstract
Tungsten coatings were obtained on a tungsten substrate by molten salt electrodeposition (MSE) at 50 mA/cm2 for 60 min in a NaCl-KCl-NaF-WO3 (0.3385:0.3385:0.25:0.0 73mol) melt at 800 °C. The MSE tungsten coatings have rough rectangular pyramid surface and special columnar grains structure. Thermal fatigue tests have shown that the damage factor of MSE tungsten coatings was smaller than that of rolled tungsten under the same thermal loads and MSE tungsten coatings displayed better thermal fatigue properties compared to that of rolled tungsten, which was attributed to high purity, special columnar grains and rectangular pyramid surface morphology.
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