Hydrothermal Crystallization with Microstructural Self-Healing Effect on Mechanical and Failure Behaviors of Plasma-Sprayed Hydroxyapatite Coatings

2011 ◽  
pp. 251-312
Keyword(s):  
Self Healing ◽  
Hydrothermal Crystallization ◽  
Healing Effect ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed

Hydrothermal crystallization effect on the improvement of erosion resistance and reliability of plasma-sprayed hydroxyapatite coatings

2009 ◽  
Vol 517 (17) ◽  
pp. 5380-5385 ◽  
Author(s):  
Chung-Wei Yang ◽  
Truan-Sheng Lui ◽  
Li-Hui Chen
Keyword(s):  
Erosion Resistance ◽  
Hydrothermal Crystallization ◽  
Hydroxyapatite Coatings ◽  
Crystallization Effect ◽  
Plasma Sprayed

MICROSTRUCTURAL HEALING WITH INTERFACIAL REACTION LAYERS ON THE ADHESIVE STRENGTH ENHANCEMENT OF PLASMA-SPRAYED HYDROXYAPATITE COATINGS

2010 ◽  
Vol 24 (01n02) ◽  
pp. 76-84
Author(s):  
CHUNG-WEI YANG ◽  
TRUAN-SHENG LUI
Keyword(s):  
Adhesive Strength ◽  
Composite Coatings ◽  
Strengthening Effect ◽  
Hydrothermal Crystallization ◽  
Cohesive Failure ◽  
Intermediate Layers ◽  
Hydroxyapatite Coatings ◽  
Percentage Area ◽  
Tensile Adhesion ◽  
Plasma Sprayed

The effect of hydrothermal crystallization and adding reinforced intermediate layers on improving the tensile adhesion of plasma-sprayed HA coatings (HAC) was investigated. The experimental results show that the index of crystallinity (IOC) and phase purity of hydrothermally-treated HAC (HT-HAC) are increased by the low-temperature hydrothermal treatment. The microstructural healing effect with nano-size HA crystallites is significant to diminish the defects and prevent mechanical strength degradation for the HT-HAC. XPS analysis demonstrates that hydrothermal crystallization helps to promote the interfacial Ti – OH chemical reaction. HA composite coatings with CP - Ti and ZrO 2 intermediate layers provide another strengthening effect compared with the hydrothermal-heating method. The inter-diffusion of Ca results in a chemical bonding at the HA / ZrO 2 interface, which results in the increase of the adhesive strength of composite coatings. The fracture behavior is different between the crystallization-induced HAC and the composite coatings. The HT-HAC remains on the substrate with an evident cohesive failure. The adhesive failure occurred at HA /intermediate layers for composite coatings. Failures with less percentage area of interfacial fracture are indicative of a higher strength of a coating.

Reliability Evaluation of Hydrothermal Crystallization on Plasma-Sprayed HA Coatings by the Weibull Model

2007 ◽  
Vol 345-346 ◽  
pp. 1389-1392
Author(s):  
Chung Wei Yang ◽  
Truan Sheng Lui
Keyword(s):  
Hydrothermal Treatment ◽  
Bonding Strength ◽  
Weibull Model ◽  
Hydrothermal Crystallization ◽  
Dense Structure ◽  
Defect Healing ◽  
Healing Effect ◽  
Crystallization Effect ◽  
Vacuum Heating ◽  
Plasma Sprayed

Plasma-sprayed HA coatings (HACs) on Ti-6Al-4V substrates with post-heat treatments were employed to improve the microstructural homogeneity, bonding strength and reliability of the HACs. A defect-healing effect can be recognized to diminish coating defects with the hydrothermal treatment, and 150°C hydrothermally-treated HACs shows a significant improved bonding strength than 600°C vacuum heating HACs because of its dense structure from the defect-healing effect. Low-temperature hydrothermal treatment demonstrates a more superior crystallization effect than vacuum heat treatment. Based on the statistical calculation by the Weibull distribution function, hydrothermally-treated HACs show a wear-out failure with a higher Weibull modulus than vacuum heating HACs. Hydrothermally-treated HACs possessed better reliability can be attributed to the suppression of defect content (about 2.6-3.2 volume %) and its smaller strength data fluctuation.

Grit blasting of Ti–6Al–4V alloy: Optimization and its effect on adhesion strength of plasma-sprayed hydroxyapatite coatings

2007 ◽  
Vol 194 (1-3) ◽  
pp. 15-23 ◽  
Author(s):  
Z. Mohammadi ◽  
A.A. Ziaei-Moayyed ◽  
A. Sheikh-Mehdi Mesgar
Keyword(s):  
Adhesion Strength ◽  
Grit Blasting ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed

Self-Healing Behavior of Sodium Polyacrylate-Hydroxyapatite Coatings on Biodegradable Magnesium Alloy

CORROSION ◽  
10.5006/2509 ◽  
2017 ◽  
Vol 73 (12) ◽  
pp. 1461-1477 ◽  
Author(s):  
Sachiko Hiromoto ◽  
Kotaro Doi
Keyword(s):  
Magnesium Alloy ◽  
Sodium Polyacrylate ◽  
Self Healing ◽  
Hydroxyapatite Coatings ◽  
Biodegradable Magnesium

Phases Transformations in Laser Treated Hydroxyapatite Coatings

1998 ◽  
Author(s):  
X. Ranz ◽  
T. Aslanian ◽  
L. Pawlowski ◽  
L. Sabatier ◽  
R. Fabbro
Keyword(s):  
Titanium Alloy ◽  
Sample Surface ◽  
Optical Microscope ◽  
Thermal Fields ◽  
Hydroxyapatite Coatings ◽  
Titanium Alloy Substrate ◽  
Plasma Sprayed ◽  
Different Content ◽  
Kinetics Of ◽  
Xrd Method

Abstract The hydroxyapatite Ca10(PO4)6OH2 (HAP) was plasma sprayed onto titanium alloy substrate. The samples having thickness of about 150 µm ware sprayed in a way to obtain two different content of crystalline HAP: 25 an 30 %. The coatings ware subsequently submitted to laser treatment with the CO2 laser. The treatment was carried out with different laser powers and scanning velocities and resulting thereof sample surface temperatures and the kinetics of the thermal fields ware monitored with a pyrometer. The XRD method enabled verification of the crystallinity state of HAP, content of amorphous calcium phosphate and the content of foreign phases. Optical microscope was used to check the microstructure and the depth of laser modified zone.

Self-healing effect of damaged coatings via biomineralization by Shewanella putrefaciens

2021 ◽  
pp. 110067
Author(s):  
Xiangping Hao ◽  
Yun Bai ◽  
Chenhao Ren ◽  
Weiwei Chang ◽  
Hongchang Qian ◽  
...  
Keyword(s):  
Shewanella Putrefaciens ◽  
Self Healing ◽  
Healing Effect
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