Multi-billet extrusion of multi-layer composite pipes composed of stainless steel and partially stabilized zirconia

In order to investigate extrusion characteristics for multi-layer pipes, multi-layer metal-ceramics gradient composite pipes were extruded through simultaneous extrusion of different pastes composed of different proportions of 316L to PSZ with binder by means of subpresses for two-layer and four-layer pipe extrusion, then were fabricated utilizing gas pressure sintering in this paper. The characteristics of extrusion pressure-stroke curves are discussed. Sectional microstructure of sintered multi-layer pipes shows that transitional interfaces between different compositional layers are continuous and unitary. Thermal shock resistance of multilayer pipes was measured utilizing thermal shock test of soak and water quench. In summary, multi-layer metal-ceramics gradient composite pipe call be fabricated utilizing the multi-billet extrusion forming and sintering solidification.