Abstract
Three tungsten coatings with a thickness of 250 μm, 600 μmand 220 μm, respectively, were deposited on a CuCrZr substrateby the vacuum plasma spraying technology. In order to study thethermal performance of the coatings, heat load limit, thermalfatigue lifetime and thermal response tests were performed by meansof the electron beam irradiation with a heat flux from 0 MW/m2 to10 MW/m2. Experimental results indicated that tungsten coatingson CuCrZr with a titanium or tungsten/copper interlayer could expelheat flux timely and had good thermal fatigue properties. Titaniumwas a promising compliant layer which provided a reliable way tojoin tungsten onto the CuCrZr heat sink, even suffering from a heatflux of 10 MW/m2 or withstanding 54 cycles of fatigue tests under5 MW/m2. However, the better quality of tungsten coating itselfwas necessary because its surface temperature was higher than thatof the sample with a tungsten/copper interlayer.
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