Behavior of Brazed W/Cu Mockup Under High Heat Flux Loads

In order to transfer the heat from the armor to the coolant,tungsten has to be connected with a copper heat sink.The joint technology is the most critical issue for manufacturing plasma facing components.Consequently,the reliability of the joints should be verified by a great number of high-heat-flux（HHF）tests to simulate the real load conditions.W/Cu brazed joint technology with sliver free filler metal CuMnNi has been developed at Southwestern Institute of Physics（SWIP）.Screening and thermal fatigue tests of one small-scale flat tile W/CuCrZr mockup were performed on a 60 kW electron-beam Material testing scenario（EMS-60）constructed recently at SWIP.The module successfully survived screening test with the absorbed power density(P;)of 2 MW/m;to 10 MW/m;and the following 1000 cycles at P;of 7.2 MW/m2 without hot spots and overheating zones during the whole test campaign.Metallurgy and SEM observations did not find any cracks at both sides and the interface,indicating a good bonding of W and CuCrZr alloy.In addition,finite element simulations by ANSYS 12.0 under experimental load conditions were performed and compared with experimental results.