Patent ID: 6209199
Filing Date: 2001-04-03
Classification: B23P,C23C,F02K,Y10T

Abstract:
A method of manufacturing a high heat flux regenerative circuit comprising a structure having an inner functional surface in contact with a first fluid and a set of channels formed in a body of the structure for conveying a second fluid in heat exchange relationship with the first fluid, the method comprising the following steps:a) placing a support core representing the inner profile of the structure about an axis of rotation, the support core being made of a material whose coefficient of thermal expansion is very close to or slightly greater than that of a material of the body of the structure;b) making an intermediate layer on the support core out of a material that is different from that of the support core and that of the body of the structure;c) forming a series of channels regularly spaced apart around the core and opening out to face said intermediate layer, each of the channels being provided with a soluble insert comprising a mixture of organic binder and metal powder;d) preheating the support core to a temperature greater than about 850.degree. C. and making the body of the structure by thermal spraying under a vacuum or low pressure by means of a plasma torch, while maintaining the temperature of the support core at said temperature greater than 850.degree. C.;e) without dismantling the support core, machining channels in the form of grooves in the outside of the body of the structure;f) filling the channels in the body of the structure with soluble inserts comprising a mixture of organic binder and metal powder;g) forming a layer for closing the channels in the body of the structure and forming an outer envelope of the structure by thermal spraying under a vacuum or low pressure by means of a plasma torch, after preheating and while maintaining the support core at a temperature greater than about 850.degree. C.;h) eliminating the soluble inserts in the channels of the body of the structure, the soluble inserts in the channels form around the support core, and the intermediate layer; andi) withdrawing the reusable support core, wherein said structure is built up from said inner functional surface around said reusable support core.