The Sub‐System α‐TCP_ss‐Silicocarnotite Within the Binary System Ca₃(PO₄)₂–Ca₂SiO₄

Abstract

Silicon (Si) influences the biologic activity of calcium phosphate materials by modifying material properties and by direct effects on the physiological processes in skeletal tissue. Compositions belonging to the system dicalcium silicate (Ca2SiO4 = C2S)‐tricalcium phosphate (Ca3(PO4)2 = TCP), able to release that element in situ, are promising candidates for preparing new ceramic bone implants. An exact knowledge of the phase relationships in the system is required to design materials with controlled phase compositions and properties. Thus, a study of the sub‐system α‐TCPss‐Silicocarnotite within the C2S–TCP system was studied as a preliminary step toward obtaining new monophasic and/or biphasic bioceramics. Phase composition of the resulting ceramics was studied using X‐ray diffraction and scanning electron microscopy with attached wavelength dispersive spectrometer. The results showed that the sub‐system presents an invariant eutectoid point at 1158°C ± 2°C for a composition of 83 wt% Ca3(PO4)2 and 17 wt% Ca2SiO4, and typical eutectoid microstructure of lamellae morphology.

Eutectoid scaffold as a potential tissue engineer guide

“…In this context, our goal was to achieve a scaffold that included different porosity levels that would be capable to adapting it to demand by a simple strategy such as the polymer replication method . A biphasic composition, Silicocarnotite‐TCP ss , was selected based on preliminary studies, which can evolve once implanted into a lamellar morphology, along with a porous structure. In this way, we combined Silicocarnotite, described as a very close structure to HA with a good bioactive response, and TCP, which is strikingly similar to the mineralogical bone structure and it has been successfully used when doped with silicon .…”

“…The lamellae microstructure of the LS as the representative one was studied by chemical etching with acetic acid (1%) for 4 seconds. As expected, both a lamellar morphology and porous structure were observed (Figure A) and it extended to the pores. It could be observed how lamellar morphology appeared as well at the third level of pores (Figure A, middle image), with a medium lamellar size between 200‐350 nm.…”

Phase transitions in single phase Si–Ca–P-based ceramic under thermal treatment

“…There is a continuous hightemperature solid solution below the liquidus at any given ratio of C 2 S/TCP (R ss = ␣C 2 S − ␣ TCP). Recently the rich-C 2 S and rich-TCP regions have been revised [12,13].…”

Revising the Subsystem Nurse’s A-Phase-Silicocarnotite within the System Ca3(PO4)2–Ca2SiO4

“…[18], who include important modifications to the extension of various solid solution fields. Recently, other authors revised the binary system, including modifications to the invariant eutectoid points [19,20]. …”