Plasma spraying characteristics

The seemingly simple question of the relation the characteristics of a mechanically prepared metal surface and adhesion to that surface has sporadically occupied attention for many decades without any very general conclusion being reached [69]. In some recent work, Amada et al. [70,71] grit-blasted a steel substrate, varying the angle between the gun and the specimen surface, and measured the adhesion of a plasma-sprayed alumina coating. They examined profiles of the... 

The other important factor to affect the operational conditions of the cell is the voltage increase between the carbon and copper lead. This problem has been solved individually in industry. For example, a 250 pm thick layer of nickel can be coated onto the upper part of the carbon anode using the atmospheric plasma spraying method.7 This electrode has been operated at 15 to 17 A dm-2 in a 1000 A scale industrial cell for 19 months. The cell voltage was 9.5 V and polarization did not occur with this electrode. Characteristic points of this new carbon electrode are low polarizability and no anode effect, and the concentration of carbon tetrafluoride contaminating the fluorine is below 2 ppm. 

Extremely coarse powder gained by classification (to separate any finer particles) exhibits excellent flow characteristics and is used in plasma spraying. 

Microstructure characteristic of plasma sprayed Zr02/NiCoCrAlY graded coating... 

Figure 5.31 Back-scattered electron (BSE) image of two characteristic zones of a suspension plasma sprayed HAp (a) and the Ca/P profiles obtained with electron probe...

Chang, C., Shi, J., Huang, J., Hu, Z., and Ding, C. (1998) Effects of power level on characteristics of vacuum plasma sprayed hydroxyapatite coating. J. Therm. Spray Technol., 7 (4), 484-488. 

Muoto, C.K., Jordan, E.H., Gell, M., and Aindow, M. (2012) Microstructural characteristics of Y203-Mg0 composite coatings deposited by suspension plasma spraying. /. Therm. Spray Technol., 21 (6), 1309-1321. 

Demnati, I., Grossin, D., Combes, C., and Rey, C. (2014) Plasma-sprayed apatite coatings review of physical-chemical characteristics and their biological consequences. J. Med. Biol. Eng., 34 (1),... 

Ning, C.Y., Wang, Y.J., Chen, X.F., Zhao, N.R., Ye, J.D., and Wu, G. (2005) Mechanical performance and microstructural characteristics of plasma-sprayed biofunctionally gradient HA-Zr02-Ti coatings. Surf. Coat. Technol., 200 (7), 2403-2408. 

Wang, B.C., Chang, E., Yang, C.Y., Tsu, D and Tsai, C.H. (1993) Characteristics and osteoconductivity of three different plasma-sprayed hydroxyapatite coatings. Surf. Coat. Technol., 58 (2), 107—117. 

Mohammadi, Z., Ziaei-Moayyed, A.A., and Mesgar, A.S. (2008) In vitro dissolution of plasma-sprayed hydroxyapatite coatings with different characteristics experimental study and modelling. Biomed. Mater., 3 (7), 015006. 

Radin, S.R. and Ducheyne, P. (1992) Plasma spraying induced changes of calcium phosphate ceramic characteristics and the effect on in vitro stability. /. Mater. Sci. - Mater. Med., 3, 33-42. 

Weng J, Liu W, Wolke JGC, Zhang XD, de Groot K (1997) Formation and characteristics of the apatite layer on plasma-sprayed hydroxylapatite coatings in simulated body fluid. Biomaterials 18 1027-1035 Weng W, Baptista JL (1998) Alkoxide route for preparing hydroxylapatite and its coatings. Biomaterials 19 125-131... 

Thermal Plasma Spray. Analyzing equation (8-1), determine the effect of the exponential factor n on the uniformity of velocity, enthalpy, and temperature distributions. Calculate the relative radius corresponding to a decrease of the parameters twice with respect to those at the torch axis. How does thermal plasma uniformity affect the quality and characteristics of the thermal plasma spray process ... 

The biocompatibility of HO2 has been demonstrated by the formation of apatite on Ti02 substrates in simulated body fluids [166-169] (Figure 1.11). As an example, plasma-sprayed Ti02 coatings on Ti alloys have shown promising in vivo corrosion characteristics, and may act as a chemical barrier against the release of metal ions from medical implants [170]. 

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