CONVERSION OF INDUCTION HEATING DEPOSITED MONETITE COATING TO HYDROXYAPATITE COATING ON HT–C/C COMPOSITES BY HYDROTHERMAL TREATMENT IN KOH AQUEOUS/AMMONIA SOLUTION

2009 ◽  
Vol 16 (05) ◽  
pp. 675-681 ◽  
Author(s):  
DONG-MEI LI ◽  
XIN-BO XIONG ◽  
XIE-RONG ZENG ◽  
CHUN-LI ZOU ◽  
JI-ZHAO ZOU
Keyword(s):  
Hydrothermal Treatment ◽  
Induction Heating ◽  
Aqueous Ammonia ◽  
Scratch Test ◽  
Ammonia Solution ◽  
Carbon Composites ◽  
Aqueous Ammonia Solution ◽  
Ha Coating ◽  
Hydroxyapatite Coatings ◽  
Structure Morphology

Carbon/carbon composites with hydroxyapatite coatings are one of the attractive materials in the dental and orthopedic fields. In this study, hydrothermal treatment, in KOH aqueous and ammonia solutions, was used to convert an induction-heating-deposited monetite coating to an adherent HA coating on H2O2 treated C/C composites. The structure, morphology and chemical composition of the as-received HA coatings were characterized by XRD, FTIR, SEM and EDS. A scratch test was conducted to measure the adhesion of HA coatings to HT – C/C substrate. The results show that well-crystallized carbonate hydroxyapatite coatings could be achieved under the two reaction mediums. However, the as-obtained HA coatings after KOH hydrothermal treatment have higher crystallinity and Ca/P ratio than those after ammonia hydrothermal treatment, and reveal an average critical load of 29 N which is more than two times as high as that for HA coatings after ammonia hydrothermal treatment.

Effect of Temperature on Induction Heating Deposited Monetite Coating on H2O2-Treated C/C Composites Treated by Alkaline Hydrothermal Method

2011 ◽  
Vol 66-68 ◽  
pp. 378-383
Author(s):  
Xin Bo Xiong ◽  
Cen Cen Chu ◽  
Jian Feng Huang
Keyword(s):  
Chemical Composition ◽  
Induction Heating ◽  
Alkaline Solution ◽  
Critical Loads ◽  
Scratch Test ◽  
Post Treatment ◽  
Effect Of Temperature ◽  
Hydrothermal Temperature ◽  
Hydroxyapatite Coatings ◽  
Structure Morphology

The effect of alkaline hydrothermal temperature on the transformation of induction heating deposited monetite coatings to hydroxyapatite coatings on the H2O2treated C/C composite was investigated. These monetite coatings were hydrothermally treated for 4h at 353K, 373K and 393K in a 50ml autoclave with 0.1M alkaline solution. After hydrothermal post-treatment, the structure, morphology and the chemical composition of these HA coatings were characterized with XRD, FTIR, SEM and EDS. A scratch test was conducted to measure the strength of the adhesion of the coatings to the HT-C/C substrate. The results showed that only part of hydroxyapatite phases at 393K could be transformed from the monetite coatings on HT-C/C substrate, while pure hydroxyapatite phases were observed to form in the as-converted coatings with critical loads of 45.9N and 51.1N respectively when the alkaline hydrothermal post-treatment treating temperatures were 353K and 373K. The reasons for these results were suggested.

Improved HA Coating on Titanium Substrate Using Induction Heating and Hydrothermal Treatment Methods

2009 ◽  
Vol 610-613 ◽  
pp. 1227-1230
Author(s):  
Chun Li Zou ◽  
Xin Bo Xiong ◽  
Xie Rong Zeng
Keyword(s):  
Hydrothermal Treatment ◽  
Induction Heating ◽  
Hydrothermal Process ◽  
Titanium Substrate ◽  
Scratch Test ◽  
X Ray Diffraction ◽  
Ha Coating ◽  
Apatite Coating ◽  
Naoh Solution ◽  
Coating Methods

An adherent apatite coating was deposited on titanium substrate through the three steps. First, titanium substrate was modified in 10M NaOH solution at 60°C, and then immersed in acidic solution of calcium phosphate resulting in the deposition of monetite (CaHPO4) coating using induction heating technique. Finally the monetite crystals were transformed to HA by a hydrothermal process at 160°C for 2 hours. Composition、morphology and structure of the initial and final coatings were identified using X-ray diffraction (XRD), Scanning Electron Microscopy, and Energy Dispersive Spectroscopy (EDS). The final coating consisted of compact HA crystals and these HA apatite crystals stacked tightly and kept the initial morphology of the monetite crystals. The coating adhesion measured using scratch test was 25.25N. In conclusion, hydrothermal treatment and induction heating techniques are effective surface coating methods that improve bonding to titanium substrate.

Kinetics of CO2 absorption in aqueous ammonia solution

2010 ◽  
Vol 4 (5) ◽  
pp. 729-738 ◽  
Author(s):  
Feng Qin ◽  
Shujuan Wang ◽  
Ardi Hartono ◽  
Hallvard F. Svendsen ◽  
Changhe Chen
Keyword(s):  
Aqueous Ammonia ◽  
Ammonia Solution ◽  
Co2 Absorption ◽  
Aqueous Ammonia Solution ◽  
Kinetics Of

Formation and Photoinduced Electron Ejection of Amminedicyanocuprate(I) and Cyano-Bridged Trinuclear Copper(I) Complexes in Aqueous Ammonia Solution

2003 ◽  
Vol 42 (11) ◽  
pp. 3559-3564 ◽  
Author(s):  
Kenneth L. Stevenson ◽  
Jessica H. Jarboe ◽  
Stacy A. Langmeyer ◽  
Travis W. Acra
Keyword(s):  
Aqueous Ammonia ◽  
Ammonia Solution ◽  
Aqueous Ammonia Solution ◽  
Electron Ejection

X-Ray and Raman Investigations on Cyanides ofMono- and DivalentMetals and Synthesis, Crystal Structure and Raman Spectrum of Tl5(CO3)2(CN)

2002 ◽  
Vol 57 (8) ◽  
pp. 895-900 ◽  
Author(s):  
Olaf Reckeweg ◽  
Arndt Simon
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Single Crystal ◽  
Aqueous Ammonia ◽  
Ammonia Solution ◽  
Aqueous Ammonia Solution ◽  
Divalent Metals ◽  
X Ray ◽  
First Time

Pseudobinary cyanides of monovalent and divalent metals were synthesized, and X-ray and Raman data of the cyanides were measured. Single crystal X-ray structure analyses were performed on Zn(CN)2 (Pn3̄m (No. 224), a = 591.32(7) pm), Hg(CN)2 (I4̄2d (No. 122), a = 969.22(14) and c = 890,15(18) pm) and for the first time on AgCN (I4̄2d (No. 166), a = 600.58(8) and c = 526.28(11) pm). The data are compared with literature data. The reaction of TlF and NaCN in 25% aqueous ammonia solution in air led to Tl5(CO3)2(CN) which was characterized by X-ray (Cmca (No. 64), 1468.1(3), 1171.6(2) and 1266.0(3) pm) and Raman spectroscopy.

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