Pd Ag Functional Testing

Overview

The STEP Fuel Cycle (FC) system requires advanced technologies for hydrogen separation and recovery. The aim of this investigation is to demonstrate the manufacturability of palladium silver membrane assemblies. This will be achieved through conducting annealing trials, brazing trails, and diffusion bonding trials. The effect of these processes on the alloy and its properties will be evaluated through microstructural characterisation and hardness testing, respectively. These techniques will then be used to manufacture membrane assemblies which will be inspected and delivered to UKFE for subsequent testing. The objectives of this investigation are to conduct the following: 1. Tube characterisation, characterise and test the different batches of palladium silver membrane tubes, including microscopy and hardness testing, as received. 2. Annealing trials, refine and execute the process control variables for the annealing of the palladium silver membrane tubes. The effects of annealing on the alloy shall be characterised via microscopy and hardness testing. 3. Brazing trials, refine and execute the process control variables for the brazing of palladium silver membrane tubes to steel fittings. 4. Diffusion bonding trials, develop and execute the process control variables for the diffusion bonding of palladium silver membrane tubes to steel fittings. 5. Destructive testing, to complete the manufacture, inspection, and destructive testing of brazed and diffusion bonded assemblies. The microstructure and hardness of the of the joint shall be evaluated cross-sectionally. 6. Assembly manufacture, the manufacture of membrane assemblies (Figure 1) via annealing, brazing or diffusion bonding. 7. Assembly inspection, refine and execute an inspection regime on all assemblies.