Brazing of Mo to a CuZr alloy for the production of bimetallic raw materials for the CLIC accelerating structures

Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

“…The fracture did not occur in the joined area, but all the tested samples detached from the fixture (see Figure 1B); the glue failed for stresses of up to 42 MPa, and no fracturing occurred in the joined samples. Unlike what was observed in [4], where a CuZr alloy was joined to Mo using the same braze, no plastic deformation occurred in Glidcop, but, since no failure of the joint was observed, this test configuration could not be used to test the apparent shear strength of these joints.…”

“…The wettability of the brazing alloy was only measured on the Glidcop, since the wettability on Mo had already been presented and discussed elsewhere [4]. The wettability test showed that the molten alloy starts spreading at 920°C and, at 980°C, the contact angle between the molten Gemco and Glidcop is close to zero ( Figure 2).…”

“…As far as the brazing process is concerned, a preliminary study was carried out to optimize the thickness of the joint and its microstructure. The joint gap was controlled by the thickness of the brazing filler foil; a reduction in the joint-line thickness can be helpful to obtain a joint with good electrical properties, according to ref [4]. The brazing treatment was performed at 980°C, that is, at a temperature slightly above the liquidus of the filler alloy, in order to reach the best spreadability and wettability of the braze and to avoid the recovery and the softening of the copper alloy [8,9].…”

“…The present work focuses on the development of a brazing process for pure Mo and a Glidcop alloy. The authors have already investigated the joining of a CuZr alloy (UNS C15000, 80% cold worked) and Mo in the framework of the CLIC (Compact LInear Collider) project [4]; the accelerating structure is traditionally made of brazed OFE copper parts but CuZr and Glidcop could represent improved alternatives for the conducting regions that suffer from to mechanical fatigue.…”

Brazing of Mo to Glidcop Dispersion Strengthened Copper for Accelerating Structures

“…The present work focuses on the development of a brazing process for pure Mo and a Glidcop alloy. The authors have already investigated the joining of a CuZr alloy (UNS C15000, 80% cold worked) and Mo in the framework of the Compact Linear Collider (CLIC) project [ 4 ]; the accelerating structure is traditionally made of brazed oxygen free electrical (OFE) copper parts, but CuZr and Glidcop could represent improved alternatives for the conducting regions that suffer from to mechanical fatigue. Moreover, the study of the joining of Glidcop can be considered relevant, not only for the particle accelerator components, but also for other application fields, such as resistance welding electrodes, incandescent light bulb leads, hybrid circuit packages and other high temperature applications, such as X-ray tube components or heat exchanger components [ 5 , 6 ].…”