Preparation of large size aluminium alloy cylindrical
preforms by multi-layer spray deposition①
preforms by multi-layer spray deposition①
(Non-Equilibrium Material Research Institute, Central South University of Technology, Changsha 410083, P.R.China)
Abstract: Preparation of large scale aluminium alloy cylindrical preforms have been studied by the methods of vertical spray deposition and tilted spray deposition respectively. The results show that aluminium alloy cylindrical preforms of a size up tod320mm×500mm can take shape well by applying multi-layer tilted spray deposition technology if the process is controlled properly. The spray system scans in a radius ranging from the center to the rim of the preform, and the velocity is inversely proportional to the displacement. The multi-layer deposited preforms exhibit high cooling rate. The larger the diameter is and the higher the cooling rate and yield are.
Key words: multi-layer spray deposition; vertical spray; tilted spray