Tube fabrication with reusable mandrel

Details Tube fabrication with reusable mandrel Tube fabrication with reusable mandrel

C - Chemistry, Metallurgy

23

C

117/53

C23C 4/02 (2006.01) C23C 4/14 (2006.01) C23C 4/18 (2006.01)

Patent

CA 2038273

RD-20,403 TUBE FABRICATION WITH REUSABLE MANDREL ABSTRACT OF THE DISCLOSURE A method for forming a multiplicity of ring struc- tures having essentially the same internal diameter is taught. A first step in the process is the provision of a mandrel of relatively high thermal coefficient of expansion and the deposit of a layer of unreactive oxide on the surface of the mandrel. Following the oxide coating of the mandrel surface, a layer of a matrix metal is deposited thereon to form a ring structure on the nandrel The coefficient of thermal expansion of the mandrel metal and that of the matrix metal are sufficiently distinct that there is a spontaneous separation of the deposited matrix metal ring structure as the mandrel and deposited layer cool to room temperature. Following the cooling, the matrix metal ring structure can be removed from the mandrel and the mandrel is then rendered suitable for repetition of the process to deposit yet another matrix ring structure thereon.

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