J0401-2-4 Fatigue Behavior of plasma sprayed HAp top coat with Ti and HAp/Ti bond coat layers on commercially pure titanium substrates

2009 ◽  
Vol 2009.6 (0) ◽  
pp. 273-274
Author(s):  
Achariya Rakngarm ◽  
Yoshiharu MUTOH ◽  
Yuichi OTSUKA ◽  
Yukio MIYASHITA
Keyword(s):  
Bond Coat ◽  
Fatigue Behavior ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Plasma Sprayed ◽  
Titanium Substrates

Fatigue Behavior and Apatite Precipitation of Plasma-Sprayed HAp Coating on Commercially Pure Titanium Substrate in Simulated Body Fluid (SBF)

2012 ◽  
Vol 506 ◽  
pp. 66-69 ◽  
Author(s):  
Teerawat Loanapakul ◽  
A. Rakngarm Nimkerdphol ◽  
Yuichi Otsuka ◽  
Yoshiharu Mutoh
Keyword(s):  
Fatigue Test ◽  
Fatigue Behavior ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Fatigue Loading ◽  
Commercially Pure Titanium ◽  
Bending Fatigue ◽  
Commercially Pure ◽  
Plasma Sprayed ◽  
Cp Ti

Plasma sprayed Hydroxyapatite (HAp) coating on commercially pure titanium (cp-Ti) is widely used as implant materials. In this study, fatigue behavior of as-sprayed HAp top coat with HAp/Ti bond coat specimen under ambient environment (A-HTi) as well as under simulated body fluid, SBF, environment (I-HTi) at 36.5°C was investigated by four point bending fatigue test at a stress amplitude of 170 MPa under various frequencies. In order to investigate apatite precipitation during fatigue loading, the test specimen was immersed in SBF at 36.5°C during the fatigue test. For comparison, the test specimen was immersed in SBF at 36.5°C for a day to a week without fatigue loading and then the fatigue test of the immersed specimen was carried out under ambient environment (I-A-HTi). The fatigue loading would not influence the apatite precipitation in the HAp coating layer of the specimen. The fatigue lives of the I-HTi and I-A-HTi specimens were shorter compared to that of A-HTi specimen. The shorter fatigue lives of the I-HTi and I-A-HTi specimens would result from the attack of SBF on titanium substrate. However, the apatite precipitation in the coating layer up to one week immersion did not significantly influence the delamination between HAp top coat and cp-Ti substrate under the bending fatigue.

Fatigue and Acoustic Emission Behavior of Plasma Sprayed HAp Top Coat and HAp/Ti Bond Coat with HAp Top Coat on Commercially Pure Titanium

2010 ◽  
Vol 452-453 ◽  
pp. 857-860 ◽  
Author(s):  
Teerawat Loanapakul ◽  
Yuichi Otsuka ◽  
Yoshiharu Mutoh
Keyword(s):  
Acoustic Emission ◽  
Fatigue Test ◽  
Bond Coat ◽  
Pure Titanium ◽  
Coated Specimen ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Plasma Sprayed ◽  
Cp Ti ◽  
Ae Signals

In the conventional hydroxyapatite (HAp) coating, the surface of commercially pure titanium (Cp-Ti) is blasted with Al2O3 grid-blasting powders and then plasma-sprayed with HAp. To improve the adhesive strength of HAp coating, the grid-blasting with Al2O3 powders and subsequently wet-blasting by HAp/Ti mixed powders were applied on Cp-Ti substrate at ambient temperature. On the wet-blasted surface of Cp-Ti, two-layers of coating composed of HAp/Ti bond coat and HAp top coat were deposited by plasma spraying. Both types of HAp-coated specimen could survive up to 107 cycles without spallation of HAp coating at the stress amplitude of 120 MPa under four point bending fatigue test. In order to clarify mechanical failure behavior of the coatings and Ti substrate, acoustic emission (AE) signals during the entire fatigue process were observed. Relationship between AE behavior and cracking process of coated specimen was evaluated. HAp top coat with HAp/Ti bond coat strongly improved the adhesive and cohesive strength, where dense AE signals occurred at the early stage of fatigue test corresponded to plastic deformation of Ti substrate and micro-cracks in coated layers. AE signals occurred at the final stage corresponded to crack propagation in coated specimen and spallations of coated layers.

Enhancement of Hard Disk Drive Performance by Using Thin Titanium Foil Disk Substrates

2013 ◽  
Author(s):  
Anil Nigam ◽  
James White
Keyword(s):  
Low Voltage ◽  
Pure Titanium ◽  
Form Factors ◽  
Hard Disk ◽  
Disk Drive ◽  
Titanium Foil ◽  
Commercially Pure Titanium ◽  
Battery Power ◽  
Commercially Pure ◽  
Titanium Substrates

In this paper an experimental study is reported to reduce the rotating inertia in a 2½″ HDD by replacing thick hard disk platters with thin, CP (commercially pure) titanium substrates in the range of 25 microns to 152 microns in thickness. The results of this work can be extended to other disk form factors [1]. The low inertia and thinness of the titanium foil platter can be exploited to allow disk drive products to be powered on/off rapidly, decreasing energy consumption. In addition, significantly faster rpms and data thru-put can be achieved. Also, many more disk platters can be housed in each unit, increasing storage capacity; while slimmer products that operate with low voltage battery power can be developed.

Calcium Phosphate Films Coated on Titanium by RF Magnetron Sputtering for Medical Applications

2007 ◽  
Vol 539-543 ◽  
pp. 551-556 ◽  
Author(s):  
Takayuki Narushima ◽  
Kyosuke Ueda ◽  
Takashi Goto ◽  
Tomoyuki Katsube ◽  
Hiroshi Kawamura ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Magnetron Sputtering ◽  
Calcium Ion ◽  
Pure Titanium ◽  
Rf Magnetron Sputtering ◽  
Titanium Implants ◽  
Apatite Formation ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Titanium Substrates

Calcium phosphate films were coated on commercially pure titanium substrates by radiofrequency magnetron sputtering using β-tricalcium phosphate targets. The films consisted of amorphous calcium phosphate and oxyapatite phases. Immersion tests of the films were carried out in Hanks’ solution and PBS(-), and apatite formation and calcium ion elution from the films were investigated. The titanium cylinders coated with calcium phosphate films were implanted into the mandibles of beagle dogs. These results suggest that coating with calcium phosphate improves the biocompatibility of titanium implants with bone tissue.

The Fatigue Behavior of Built-Up Welded Beams of Commercially Pure Titanium

2010 ◽  
Vol 20 (7) ◽  
pp. 1247-1255 ◽  
Author(s):  
Anil Patnaik ◽  
Narendra Poondla ◽  
Udaykar Bathini ◽  
T. S. Srivatsan
Keyword(s):  
Fatigue Behavior ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Commercially Pure
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