Investigation of Physico-Chemical Properties and Microstructure of HA/316L Asymmetrical Functionally Gradient Biomaterial

Abstract

By using of hot pressing(HP) technique, HA/316L powder asymmetrical functionally gradient biomaterial (FGM) with 316L’s content changing as 100vol%→80vol%→60vol%→40vol%→20vol%→0vol% was prepared successfully. The results show obvious macroscopic gradient changes in the FGM. While the components change continuously in microcosmic, the interfaces among all gradient layers integrate tightly. The addition of 316L powder changes the fracture modes of the composites and improves their mechanical properties. HA contents in HA/316L biological FGM change regularly with different gradient layer, which is responding to the components design. Combining circumstance of phase interface is considerably well and both phase bite into each other at the interface. The two phases of HA and 316L powder dissolve into each other in some degree during hot pressing and the combining mechanism is dissolving behavior.

Interfacial diffusion reaction and mechanical characterization of 316L stainless steel-hydroxyapatite functionally graded materials for joint prostheses

“…It became evident from micrographs that all the layers of FGMs were significantly integrated. The difference in coefficient of thermal expansions of matrix and reinforcements in HA/316L composites caused sintering shrinkage and thermal cracks around HA and 316L interface [22,24]. Despite of the difference in coefficient of thermal expansions of both matrix and reinforcement (i.e.…”