Microstructure and performance of alumina silicate fibres/TCP biological FGM fabricated by hot pressing technique

Alumina silicate fibres/TCP biological functionally gradient material (FGM) was fabricated by hot pressing technique. X-ray diffraction analysis，SEM，EDAX linear scanning analysis，density and hardness test were adopted to carry out the research of the FGM. The results show that fibre contents distribution changes symmetrically in the FGM. No flaws and breakages appear in the FGM. FGM presents indistinct gradient distribution in macrostructure and continuous component changes in microstructure. TCP matrix combines with silicate fibres tightly in the FGM. Decomposition of hydroxyapatite leads to phase transformation from HA to TCP and no chemical reaction happens among TCP and fibre and the hot pressing die. With the increase of fibre contents，the fracture way changes from brittle fracture to toughness fracture and the toughness degree increases. The hardness and relative density are enhanced with the increase of fibre contents. 60 vol% fibres gradient layer behaves the highest value with hardness and relative density equal to 92.7 MPa and 86.5%，respectively.