TY - JOUR
T1 - A simplified process for preparing adhesive hydroxyapatite coatings on carbon/carbon composites
AU - Xiong, Xin bo
AU - Liu, Ling
AU - Ma, Jun
AU - Ni, Xin ye
AU - Li, Ya yun
AU - Zeng, Xie rong
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/11/15
Y1 - 2019/11/15
N2 - A monetite (CaHPO4) coating prepared by hydrothermal electro-deposition technology (HET) owned a well adhesive strength on Carbon/Carbon (C/C) composites, showing a promising prospect in orthopedic and teeth implants. However, hydrophobic C/C surface had to be pre-treated by solutions containing oxidants, such as H2O2, (NH4)2S2O8, to form chemical bonding with the calcium phosphate coating before the deposition, which is a time-consuming and tedious procedure. To simplify the CaHPO4 preparation, H2O2 was directly added into an electrolyte for depositing a well-bonded CaHPO4 coating by HET, denoted as H-CaHPO4, on naked C/C composites. For comparison, another CaHPO4 coating was prepared on H2O2 pre-treated C/C by HET under the same conditions, designated by N-CaHPO4. Both the CaHPO4 coatings were converted to HA coatings via a post-hydrothermal treatment in an ammonia solution, correspondingly defined as H-HA and N-HA. Interestingly, scratch tests showed H-HA coating on C/C through the simplified HET method had a critical load of 29 N, nearly twice as high as N-HA coating. And H-HA coating on naked C/C showed a more compact microstructure and a lower Ca/P atomic ratio in comparison with N-HA coating on H2O2 pre-treated C/C. The reasons for the change in the microstructure and the improvement in the adhesion of the coatings on C/C were discussed. Besides, in-vitro SBF tests and cell experiments indicated that H-HA coating had a better bioactivity and cell biocompatibility than N-HA coating.
AB - A monetite (CaHPO4) coating prepared by hydrothermal electro-deposition technology (HET) owned a well adhesive strength on Carbon/Carbon (C/C) composites, showing a promising prospect in orthopedic and teeth implants. However, hydrophobic C/C surface had to be pre-treated by solutions containing oxidants, such as H2O2, (NH4)2S2O8, to form chemical bonding with the calcium phosphate coating before the deposition, which is a time-consuming and tedious procedure. To simplify the CaHPO4 preparation, H2O2 was directly added into an electrolyte for depositing a well-bonded CaHPO4 coating by HET, denoted as H-CaHPO4, on naked C/C composites. For comparison, another CaHPO4 coating was prepared on H2O2 pre-treated C/C by HET under the same conditions, designated by N-CaHPO4. Both the CaHPO4 coatings were converted to HA coatings via a post-hydrothermal treatment in an ammonia solution, correspondingly defined as H-HA and N-HA. Interestingly, scratch tests showed H-HA coating on C/C through the simplified HET method had a critical load of 29 N, nearly twice as high as N-HA coating. And H-HA coating on naked C/C showed a more compact microstructure and a lower Ca/P atomic ratio in comparison with N-HA coating on H2O2 pre-treated C/C. The reasons for the change in the microstructure and the improvement in the adhesion of the coatings on C/C were discussed. Besides, in-vitro SBF tests and cell experiments indicated that H-HA coating had a better bioactivity and cell biocompatibility than N-HA coating.
KW - CaHPO
KW - Coating
KW - HO
KW - Hydrothermal electrochemical
KW - Hydroxyapatite
UR - http://www.scopus.com/inward/record.url?scp=85070940316&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2019.124925
DO - 10.1016/j.surfcoat.2019.124925
M3 - Article
AN - SCOPUS:85070940316
SN - 0257-8972
VL - 377
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 124925
ER -