New technique for bonding hydroxyapatite ceramics and titanium by the hydrothermal hot-pressing method

Wang

Zhu

et al. 2008

Apatite forming and hydroxyapatite ceramics bonding ability of titanium (Ti)-based bulk metallic glasses (Ti 40 Zr 10 Cu 36 Pd 14 and (Ti 0.40 Zr 0.10 Cu 0.36 Pd 0.14 ) 99 Ca 1 : BMGs) were investigated as a new type of biomaterials. Powder mixture of CaHPO 4 ･2H 2 O and Ca(OH) 2 and the BMGs disks were treated with autoclave for hydrothermal hot-pressing (HHP) simultaneously (150°C, 40 MPa, 2hours). Direct bonding hydroxyapatite ceramics and both type of BMGs could not be achieved. And then, the BMGs disks with the HHP treatment were soaked in simulated body fluid for 7-10 days. It was observed that apatite are deposited and covered on the surface of the BMGs with the HHP treatment. It was firstly demonstrated that surfaces of Ti based bulk metallic glasses can be made bioactive and that HHP techniques were useful methods in purpose of making Ti-based bulk metallic glass surface bioactive.

Section: Resultsmentioning

confidence: 99%

“…In this study, we tried to bond bioactive hydroxyapatite ceramics and Ti-based bulk metallic glasses through hydrothermal hot-pressing technique. 6) And investigated apatite forming ability of Ti-based bulk metallic glasses in an simulated body fluid (SBF: Kokubo's solution) 7) in order to evaluate of bioactivity.…”

Section: Introductionmentioning

confidence: 99%

Bioactivity of titanium-based bulk metallic glass surfaces via hydrothermal hot-pressing treatment

Wang

Zhu

et al. 2008

“…HA ceramics have been also synthesized using the conventional hydrothermal hot-pressing (HHP) method in our previous study, 9) where a uniaxial load was applied to the starting powers using upper and lower loading rods in order to produce high pressure environments. Furthermore, XRD powder analysis, as shown in the previously published literature, 10) of the HA coatings showed that the low temperature hydrothermal method indicated no chemical decomposition unlike high temperature methods such as a plasma splaying method.…”

Section: ¹3mentioning

confidence: 99%

“…8) In our previous reports, we have proposed new techniques for bonding HA bulk ceramics and pure Ti and Ti alloys disks through a hydrothermal hot-pressing (HHP). 9) HA ceramics was bonded to the flat surface of a Ti disk using the HHP method at 423 K and 40 MPa. Moreover, a new HA coating method utilizing p the HHP phenomenon was reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of titanium surface treatment on adhesive properties of hydroxyapatite ceramics coating to titanium substrates by double layered capsule hydrothermal hot-pressing

Kuno

Nakahira

et al. 2010

This report described the effects of Ti surface modification with NaOH hydrothermal solution on adhesion strength of HA coating produced by newly developed hydrothermal (DC-HHP) method. 2 kinds of surface layer (containing anatase-type TiO 2 or not) were formed on Ti surface by immersing to 5 mol/L NaOH solution before HA coating process. Pull out tests were conducted to obtain an estimate for the adhesion properties of the HA coating. Shear strength of specimens with 5 mol/L NaOH treated at 423 K for 2 hours was estimated in the range of 4.15.7 MPa. The enhancement of the HA adhesive properties as well as more than three times values was achieved, in comparison to the specimens without the surface layer (approximate 1.5 MPa). It was demonstrated that 423 K hydrothermal treatment with 5 mol/l NaOH solution on Ti surfaces is significantly effective to enhancing adhesion strength of the HA coating produced by the DC-HHP method.

“…22) Additionally, HA ceramic coatings on Ti substrates were obtained with no chemical decomposition and strong adhesive properties by using DC-HHP techniques. 24) It is easily forecasted that low temperature techniques is required for HA coating on Mg alloys, because Mg has higher chemical activity.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite ceramics coating on magnesium alloy via a double layered capsule hydrothermal hot-pressing

Yamamoto

2010

Hydroxyapatite (HA: Ca 10 (PO 4 ) 6 (OH) 2 ) ceramic coating on magnesium (Mg) alloy (AZ31; Mg3Al1Zn) was achieved simultaneously by using a double layered capsule hydrothermal hot-pressing (DC-HHP) method at the low temperature as low as 150°C with no special surface treatment on the surface of the Mg alloy. A mixture of calcium hydrogen phosphate dehydrate (DCPD) and calcium hydroxide (Ca(OH) 2 ) was used as a starting powder material for solidifying HA. Pull-out tests were conducted in order to obtain an estimate of adhesive properties for the HA coating to the Mg alloy. Average value of maximum shear stress was determined to 6.1 « 1.0 MPa. After the pull-out fracture tests, it was revealed that HA ceramics remained on the surface of the Mg alloy. The Mg alloy could be bonded to HA ceramics with good adhesive properties.