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Title: Effects of Water Location in Starting Materials on Bonding Behavior of Hydroxyapatite and Titanium via Hydrothermal Hot-pressing

Abstract

Solidification of hydroxyapatite (HA:Ca10(PO4)6(OH)2) and its bonding with titanium (Ti) was achieved simultaneously by using the hydrothermal hot-pressing method at temperatures as low as 150 deg. C with no special surface treatment of Ti. A mixture of calcium hydrogen phosphate dihydrate and calcium hydroxide was used as the starting powder material for solidifying HA. Three point bending tests were conducted to obtain an estimate of the fracture toughness for the HA/Ti interface as well as for the HA ceramics only. The fracture toughness tests showed that the induced crack from the pre-crack tip deviated from the HA/Ti interface and propagated into the HA. It is cleared that water in starting materials must be crystallized in starting materials in order to achieve the bonding HA ceramics and Ti by the HHP method. The fracture toughness determined on the bonded HA/Ti specimen was close to that of the HA ceramics only (approximate 0.3 Mpam1/2)

Authors:
;  [1];  [2]
  1. Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University, 6-6-11-7 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579 (Japan)
  2. Shiraishi Kogyo Kaisha Limited, 4-78 Motohama-cho, Amagasaki, 660-0085 (Japan)
Publication Date:
OSTI Identifier:
20798641
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 833; Journal Issue: 1; Conference: 3. international workshop on water dynamics, Sendai (Japan), 16-17 Nov 2005; Other Information: DOI: 10.1063/1.2207087; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; BENDING; BONDING; CALCIUM; CALCIUM HYDROXIDES; CERAMICS; CRACKS; FRACTURE PROPERTIES; HOT PRESSING; HYDRATES; INTERFACES; MIXTURES; PHOSPHORIC ACID; POWDERS; SOLIDIFICATION; SURFACE TREATMENTS; TITANIUM; WATER

Citation Formats

Onoki, Takamasa, Hashida, Toshiyuki, and Hosoi, Kazuyuki. Effects of Water Location in Starting Materials on Bonding Behavior of Hydroxyapatite and Titanium via Hydrothermal Hot-pressing. United States: N. p., 2006. Web. doi:10.1063/1.2207087.
Onoki, Takamasa, Hashida, Toshiyuki, & Hosoi, Kazuyuki. Effects of Water Location in Starting Materials on Bonding Behavior of Hydroxyapatite and Titanium via Hydrothermal Hot-pressing. United States. doi:10.1063/1.2207087.
Onoki, Takamasa, Hashida, Toshiyuki, and Hosoi, Kazuyuki. Mon . "Effects of Water Location in Starting Materials on Bonding Behavior of Hydroxyapatite and Titanium via Hydrothermal Hot-pressing". United States. doi:10.1063/1.2207087.
@article{osti_20798641,
title = {Effects of Water Location in Starting Materials on Bonding Behavior of Hydroxyapatite and Titanium via Hydrothermal Hot-pressing},
author = {Onoki, Takamasa and Hashida, Toshiyuki and Hosoi, Kazuyuki},
abstractNote = {Solidification of hydroxyapatite (HA:Ca10(PO4)6(OH)2) and its bonding with titanium (Ti) was achieved simultaneously by using the hydrothermal hot-pressing method at temperatures as low as 150 deg. C with no special surface treatment of Ti. A mixture of calcium hydrogen phosphate dihydrate and calcium hydroxide was used as the starting powder material for solidifying HA. Three point bending tests were conducted to obtain an estimate of the fracture toughness for the HA/Ti interface as well as for the HA ceramics only. The fracture toughness tests showed that the induced crack from the pre-crack tip deviated from the HA/Ti interface and propagated into the HA. It is cleared that water in starting materials must be crystallized in starting materials in order to achieve the bonding HA ceramics and Ti by the HHP method. The fracture toughness determined on the bonded HA/Ti specimen was close to that of the HA ceramics only (approximate 0.3 Mpam1/2)},
doi = {10.1063/1.2207087},
journal = {AIP Conference Proceedings},
number = 1,
volume = 833,
place = {United States},
year = {Mon May 15 00:00:00 EDT 2006},
month = {Mon May 15 00:00:00 EDT 2006}
}
  • Solidification of hydroxyapatite (HA) and its bonding with titanium (Ti) was achieved simultaneously by using a hydrothermal hot-pressing (HHP) method at the low temperature as low as 150 deg. C. A mixture of calcium hydrogen phosphate dihydrate(DCPD) and calcium hydroxide was used as a starting powder material for solidifying HA. 3-point bending tests were conducted to obtain an estimate of the fracture toughness for the HA/Ti interface. Application of pressures greater than 20MPa was necessary for bonding, and the interface strength increased with the increasing applied pressure. However, the degree of HA formation was lower when the pressure was increased.more » Excessively long term HHP treatment was shown to be ineffective for the bonding and there was an optimal treatment time. The optimal pressure and treatment time for bonding were estimated to be 40MPa and 12hrs, respectively.« less
  • Highlights: • Carbonated apatite (CAP) could be easily obtained from CaCO{sub 3} and orthophosphates. • Highest CaCO{sub 3} dissolution and apatitic carbonate content were obtained with H{sub 3}PO{sub 4}. • A-B-type CAP was formed. • The synthesized CAP was thermally stable up to 1000 °C. • This CAP showed high biomineralization activity before and after thermal treatment. - Abstract: The one-step synthesis of carbonated hydroxyapatite (CAP) using calcite and different orthophosphates was investigated in a closed batch reactor. Only orthophosphoric acid could lead to the complete decomposition of calcite particles, when the reaction temperature was set at 80 °C. Onmore » the other hand, the reaction time and the dilution of the initial calcite suspension had no significant influence on the formation of the solid products. CAP was formed as the main crystalline calcium phosphate with the carbonate content in the range of 4.2–4.6 wt.%. The thermal decarbonation of the synthesized CAP started at 750 °C but it was only significant at 1000 °C under air atmosphere. This thermal decarbonation was total at 1200 °C or above. All CAP samples and products following thermal treatments were found bioactive in the test using simulated body fluid (SBF) solution.« less
  • The morphology and size of hydroxyapatite Ca{sub 10}(PO{sub 4}){sub 6}(OH){sub 2} (denoted HAP) can be controlled under hydrothermal treatment assisted with different dendrimers, such as carboxylic terminated poly(amidoamine) (PAMAM) and polyhydroxy terminated PAMAM. The structure and morphology were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and transmission electron microscopy (TEM). IR spectra were also used to investigate the complexation of Ca{sup 2+} with PAMAM. The results revealed that the inner cores of the PAMAM dendrimers are hydrophilic and potentially open to calcium ions, since interior nitrogen moieties serve as complexation sites, especially in case of the polyhydroxy terminated PAMAM.more » And the reasonable mechanism of crystallization was proposed that it can be attributed to the localization of nucleation site: external or interior PAMAM. Additionally, the PAMAM dendrimer with carboxylic and polyhydroxy groups has an effective influence on the size and shape of hydroxyapatite (HAP) nanostructures. Different crystal morphology was accomplished by adsorption of different dendrimers onto specific faces of growing crystals, altering the relative growth rates of the different crystallographic faces and leading to different crystal habits.« less
  • Sludge ash was solidified with borosilicate glass powder by hydrothermal hot-pressing. The ash and glass were mixed with water and hot-pressed under several hydrothermal conditions. When the ash, mixed with 50 wt% glass, was solidified under the conditions 300 C, 1,200 seconds, 25 MPa, and 15 wt% water, the compressive strength of solid body was found to be three times as that of a concrete block. The volumetric reduction ratio of sludge ash by solidification reached 35.1%. Resulting from residual strength after heating, the solid body was thermally stable in comparison with the concrete block. The solidification reduced the leachabilitymore » of heavy metals from the ash. Mass treatment of sludge ash was performed by using a test plant. Homogeneity of the large, formed solid body was evaluated by surveying the strength of core samples. There were no differences in the properties of the solid body samples obtained from various locations.« less
  • Borosilicate glass powder with simulated high-level radioactive waste (HLW) was solidified by a hydrothermal hot-pressing method. A leach test of the solid bodies was performed. Twenty-one elements composing the simulated HLW in the leachant were analyzed quantitatively by neutron activation analysis. The addition of Al(OH){sub 3}, up to 7.5% of the starting powder, reduced the leachability. The first densification of the starting powder during hydrothermal hot-pressing takes place by the rearrangement of particles, followed by solution-precipitation. The densification fits two types of rate equations. Activation energies obtained from two rate equations agree and are smaller than those of the glassmore » without simulated HLW. The results indicate that simulated HLW in the starting powder acts to reduce the activation energy for densification during hydrothermal hot-pressing.« less