Research on Residual Stress and Surfacial Morphology of Bio-Functionally Gradient HA-ZrO2–Ti Coatings

2007 ◽  
Vol 330-332 ◽  
pp. 1301-1304 ◽  
Author(s):  
Cheng Yun Ning ◽  
Ying Jun Wang ◽  
Xiao Feng Chen ◽  
Jian Dong Ye ◽  
Gang Wu ◽  
...  
Keyword(s):  
Residual Stress ◽  
X Ray Diffraction ◽  
X Ray ◽  
Functionally Gradient ◽  
Ha Coating ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Plasma Spraying Process ◽  
Spraying Process ◽  
Scanning Electron

In the present study, Functionally gradient HA-ZrO2-Ti coatings (FGC) on Ti6Al4V were prepared by the plasma spraying process. The residual stress and surfacial morphology of coating were studied by X-ray diffraction and scanning electron microscopy with an energy dispersive spectroscopy. The results showed that: (1) the residual stress of FGC is 72.1Mpa, much lower than that of single HA coating, (2) The surfacial morphology of the FGC showed typical characteristics of plasma-sprayed coating, no microcracks was observed because of its the thermal expansion matched between the gradient coating and substrate.

Microstructure of Al2O3-13TiO2 Coatings Deposited from Nanoparticles by Plasma Spraying

2013 ◽  
Vol 58 (2) ◽  
pp. 335-339 ◽  
Author(s):  
A. Góral ◽  
L. Litynska-Dobrzynska ◽  
W. Zórawski ◽  
K. Berent ◽  
J. Wojewoda-Budka
Keyword(s):  
Plasma Spraying ◽  
Steel Substrate ◽  
Nanosized Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lamellar Morphology ◽  
Transmission Electron ◽  
Plasma Sprayed ◽  
Plasma Spraying Process ◽  
Spraying Process

The aim of the study was to characterize nanostructured Al2O3-13TiO2 coatings deposited by plasma spraying on a grit blasted steel substrate. The Al2O3-13TiO2 coatings were characterized using scanning and transmission electron microscopy and X-ray diffraction techniques. Obtained coatings possessed a unique microstructure consisting of fully melted regions with the microstructure similar to a typical plasma sprayed lamellar morphology as the conventional coatings and areas comprising unmelted or partially melted nanosized particles. The analysis showed that most of the α-Al2O3 phase from the nanostructured powders transformed into γ-Al2O3 phase after plasma spraying process. Moreover, the presence of amorphous phase was also observed.

Surface Raman characterization of plasma-sprayed TiC coatings from the tokamak fusion reactor at Varennes, Quebec

1990 ◽  
Vol 68 (3) ◽  
pp. 293-295 ◽  
Author(s):  
M. S. Mathur ◽  
J. S. C. McKee ◽  
G. G. Ross ◽  
H. A. Marzouk ◽  
E. B. Bradley
Keyword(s):  
Photoelectron Spectroscopy ◽  
Fusion Reactor ◽  
Hydrogen Plasma ◽  
Plasma Discharges ◽  
X Ray ◽  
Plasma Sprayed ◽  
Plasma Spraying Process ◽  
Spraying Process ◽  
Raman Characterization

TiC coatings deposited by a plasma spraying process were placed on the internal wall of the tokamak fusion rector at Varennes, Quebec and were subjected to repeated ~1500 hydrogen plasma discharges. X-ray photoelectron spectroscopy and unenhanced surface Raman scattering were used to investigate the possibility of the formation of C–H and Ti–H complexes on the TiC plasma sprayed surfaces.

Characterization and Photocatalytic Properties of Plasma Sprayed TiO2 Coatings Deposited from Nanoparticles

2006 ◽  
Vol 317-318 ◽  
pp. 561-564
Author(s):  
Huang Chen ◽  
Tae Ho Kim ◽  
Soo Wohn Lee ◽  
Ho Sung Aum ◽  
Bo Young Hur ◽  
...  
Keyword(s):  
Photocatalytic Property ◽  
Photocatalytic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Tio2 Coatings ◽  
Plasma Sprayed ◽  
Tem Transmission Electron Microscopy ◽  
Scanning Electron ◽  
Observation Results

The phase and microstructure of four kinds of plasma sprayed TiO2 coatings (P25, ST, NK, KT) were characterized by XRD (X-ray Diffraction), FE-SEM (Field Emission Scanning Electron Microscope) and TEM ( Transmission Electron Microscopy). Their photocatalytic properties were discussed in relation to phase composition and microstructure. The FE-SEM observation results reveal that there are quite a number of nanoparticles on the surfaces of all four kinds of plasma sprayed TiO2 coatings, which provide photocatalytic reactive sites. Based on the observation results of FE-SEM and TEM, the microstructure schematic of plasma sprayed TiO2 coatings using nanoparticles as feedstock is suggested. The best photocatalytic property of P25 coating among the four plasma sprayed TiO2 coatings is attributed to the combination of its fine “cauliflower” structure and the highest anatase content.

Enhancing the Bonding Strength of Plasma-Sprayed HA Coating on Pure Ti

2007 ◽  
Vol 561-565 ◽  
pp. 1553-1556 ◽  
Author(s):  
Sen Yang ◽  
Hau Chung Man
Keyword(s):  
Calcium Phosphate ◽  
Calcium Oxide ◽  
Tricalcium Phosphate ◽  
X Ray Diffraction ◽  
Tetracalcium Phosphate ◽  
X Ray ◽  
Gas Nitriding ◽  
Ha Coating ◽  
Scaffold Structure ◽  
Plasma Sprayed

A layer of bioceramic HA was coated on laser gas nitrided and grit-blasted pure Ti substrates using plasma-spraying technique, respectively. X-ray diffraction analysis showed that the microstructures of the coating were mainly composed of HA, amorphous calcium phosphate and some minute phases of tricalcium phosphate, tetracalcium phosphate and calcium oxide. The experimental results showed that the 3-D TiN dendritic scaffold structure produced on the surface of pure Ti using laser gas nitriding technique in advance could anchor the HA coating and improved the interfacial adherence significantly as compared with those on the grit blasted surfaces.

Residual Stress Measurement of Plasma Sprayed Coating Layers in ZrO2

2007 ◽  
Vol 544-545 ◽  
pp. 451-454
Author(s):  
Soo Wohn Lee ◽  
Jia Zhang ◽  
Huang Chen ◽  
J. S. Song ◽  
Jae Kyo Seo ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Diffraction Method ◽  
Spray Coating ◽  
X Ray Diffraction ◽  
Plasma Sprayed Coatings ◽  
Coating Layers ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Plasma sprayed coatings have been widely applied in modifying surface properties of metal components. It is also useful to prevent various types of wear, corrosion, erosion and thermal. But the residual stress is still an important problem which can effect the properties of sprayed coating. So it’s necessary to find out the reason of residual stress and the relationship between plasma sprayed condition and residual stress. Plasma spray coating layers with conventional ZrO2 powder was examined to calculate residual stress by X-ray diffraction method with various coating thickness.

Modification of Microstrucure and Residual Stress on Friction Welding Surface of Titanium Alloy by Water-Jet Cavitation Peening

2011 ◽  
Vol 317-319 ◽  
pp. 429-435 ◽  
Author(s):  
Dong Ying Ju ◽  
Xin Mao Fu ◽  
Shun Na ◽  
Bing Han ◽  
Xiao Hu Deng
Keyword(s):  
Electron Microscopy ◽  
Residual Stress ◽  
Welded Joints ◽  
Compressive Residual Stress ◽  
Welded Joint ◽  
Water Jet ◽  
X Ray Diffraction ◽  
X Ray ◽  
Welding Surface ◽  
Scanning Electron

Water jet cavitation peening is applied to improve the strength and mechanical properties of the friction-welded joints of titanium alloys. Scanning electron microscopy observations of the microstructure of the welded joints and welded area before/after water jet cavitation peening confirm slip dislocation at the microstructure near the surface of the specimens. The residual stress on the surface of the welded joint is measured by X-ray diffraction. The results indicate the effect of peening time on the strength of compressive residual stress.

Fabrication of W/Cu Functionally Gradient Materials by Multi-Billet Extrusion

2005 ◽  
Vol 475-479 ◽  
pp. 1511-1516
Author(s):  
Jian Xin Xie ◽  
Shi Bo Li ◽  
Shu Chen
Keyword(s):  
Electron Microscope ◽  
Extrusion Process ◽  
X Ray Diffraction ◽  
Functionally Gradient Materials ◽  
Homogeneous Microstructure ◽  
Gradient Materials ◽  
X Ray ◽  
Functionally Gradient ◽  
Scanning Electron

W/Cu functionally gradient materials (FGMs) are fabricated by a novel process—multi-billet extrusion (MBE). Different W/Cu superfine powders made by mechanical alloying (MA) are used to improve the sinterability of W/Cu compacts. Good quality of three-layer W/Cu extrudes are obtained after confirming the extrusion parameters and the type and the content of binder during extrusion process. The green products are pressureless sintered at the temperature range of 1100-1300 oC for 1 h. W/Cu FGMs with relatively high density and high homogeneous microstructure are attained after sintering at 1200 oC for 1 h. The mechanisms for the enhance of sinterability and improvement of density of the mechanical alloyed (MAed) W-Cu powder products have been discussed. X-ray diffraction and scanning electron microscope are used to identify and observe phase constitution and microstructure, respectively.

Sign in / Sign up

Export Citation Format

Share Document