Low temperature preparation of SiO2 reinforced hydroxyapatite coating on carbon/carbon composites
In the past decades, weak adhesive strength and thin thickness are headaches existed between carbon/carbon (C/C) composite and hydroxyapatite (HA) coating by one-step electrochemical deposition. To solve this problem, a monetite precursor coating was first synthesized on (NH4)2S2O8 treated C/C (N-C/...
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Veröffentlicht in: | Journal of alloys and compounds 2019-06, Vol.788, p.768-778 |
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Sprache: | eng |
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Zusammenfassung: | In the past decades, weak adhesive strength and thin thickness are headaches existed between carbon/carbon (C/C) composite and hydroxyapatite (HA) coating by one-step electrochemical deposition. To solve this problem, a monetite precursor coating was first synthesized on (NH4)2S2O8 treated C/C (N-C/C) by hydrothermal electrochemical deposition, and then hydrothermally treated in a sodium silicate solution to transform into a SiO2/HA composite coating. The morphology, microstructure, in-vitro bioactivity and biocompatibility of the SiO2/HA coating were investigated. The distribution of spherical nano SiO2 in the HA coating was homogeneous with uniform grain size of about 100 nm. The composite coating had a rod shaped morphology and a compact microstructure. For comparison, another HA coating was prepared on N-C/C under the same processing conditions except for sodium silicate addition in the hydrothermal system. Scratch and nano-indentation tests showed that this SiO2/HA composite coating presented an adhesive strength of a critical load of 31.63 N, was nearly 1.5 times as high as one of the HA coating on N-C/C, and its modulus and hardness were 58.3 Gpa and 2.93 Gpa, far higher than those of the HA coating. In-vitro bioactivity and cell biocompatibility tests showed that the SiO2/HA coating could induce apatite growth and had superior abilities of cell attachment and cell proliferation to naked C/C and the HA coating.
A procedure to prepare SiO2 reinforced hydroxyapatite coating in this article is described as following. [Display omitted]
•A SiO2/HA coating was successfully synthesized through a low temperature process.•The adhesive strength of the SiO2/HA coating can reach a critical load of 31.63 N.•The SiO2/HA coating owned higher hardness and elastic modulus than HA coating without SiO2. |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2019.02.286 |