Development of Nanostructured Al2O3-Ni HVOF Coatings

2006 ◽  
Vol 317-318 ◽  
pp. 539-544 ◽  
Author(s):  
Simo Pekka Hannula ◽  
Erja Turunen ◽  
Jari Keskinen ◽  
Tommi Varis ◽  
Teppo Fält ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Spraying ◽  
Al2o3 Coating ◽  
Hvof Spraying ◽  
Protective Properties ◽  
Hvof Coatings ◽  
Hvof Thermal Spraying ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

HVOF thermal spraying has been developed to deposit dense Al2O3-coatings for improved protective properties. As compared to generally used plasma sprayed coatings HVOF coatings can be prepared much denser and thus are better suited for applications where protective properties of the coating are needed. In this paper we describe the development of HVOF spraying technologies for nanocrystalline Al2O3- and Al2O3-Ni-coatings. The microstructure and the mechanical properties of these novel coatings are reported and compared to a conventionally processed Al2O3-coating.

Applications of Nanoindentation Techniques in the Field of Surface Coatings

2008 ◽  
Vol 373-374 ◽  
pp. 802-805 ◽  
Author(s):  
Hong Mei Wang ◽  
Pei Jing Shi ◽  
He Long Yu ◽  
Wei Zhang ◽  
Bin Shi Xu
Keyword(s):  
Mechanical Properties ◽  
Test System ◽  
Surface Coatings ◽  
Analysis Method ◽  
Depth Sensing ◽  
New Type ◽  
Plasma Sprayed Coatings ◽  
Increasing Demand ◽  
Plasma Sprayed ◽  
Sprayed Coatings

As new engineering coatings get ever thinner and more technologically advanced, there is an increasing demand for accurate assessment of the mechanical properties of thin films. The rapidly expanding field of depth-sensing evaluation and techniques related provides a quantitative method for mapping the micro/nano mechanical properties. A new type of nano test system was introduced, the technology principle and the data analysis method were described. It was used to test the performance of brush-plated nanocomposite coatings, supersonic plasma-sprayed coatings and self-repairing microcapsule for corrosion-proof coatings, including the distribution of mechanical properties across the surface and the section and nanoindentation creep. The results show that nanoindentation techniques play an incomparable role in charactering the performance of surface coatings.

Bioactivity and mechanical properties of plasma-sprayed coatings of bioglass powders

2013 ◽  
Vol 220 ◽  
pp. 60-66 ◽  
Author(s):  
M. Monsalve ◽  
H. Ageorges ◽  
E. Lopez ◽  
F. Vargas ◽  
F. Bolivar
Keyword(s):  
Mechanical Properties ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Wear Properties of WC/Co Coatings with Plasma and High Velocity Oxyfuel Spraying

1998 ◽  
Author(s):  
T. Akasawa ◽  
K. Ai
Keyword(s):  
High Velocity ◽  
Material Removal ◽  
Sliding Wear ◽  
Substrate Surface ◽  
Wear Properties ◽  
Hvof Spraying ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Steel Substrates ◽  
Sprayed Coatings

Abstract A tungsten carbide/cobalt hard coating was deposited on steel substrates using plasma-arc and high velocity oxyfuel flame (HVOF) spraying. The characteristics of the coatings made by the two spraying methods were evaluated under identical conditions. The microstructure and the chemical composition ofthe coatings were different depending on the powderheating temperature and the velocity of particles. The sliding wear properties of the coatings against hardened steel at high sliding speeds showed different tendencies from those at low speeds. The plasma sprayed coatings resulted in better abrasive wear properties than HVOF coatings did. Material removal by solid particle erosion depended on the striking angle ofparticles on the substrate surface but there are no clear differences in wear properties between the two coatings.

scholarly journals Preliminary Studies on HVOF Sprayed Coatings on Magnesium Alloys

2020 ◽  
Vol 2 (1) ◽  
pp. 23
Author(s):  
Ewa Jonda ◽  
Leszek Łatka ◽  
Grzegorz Więcław
Keyword(s):  
Mechanical Properties ◽  
Surface Engineering ◽  
Thermal Spraying ◽  
Life Time ◽  
Good Alternative ◽  
Composition Analysis ◽  
Hvof Spraying ◽  
Foundry Alloys ◽  
Oxygen Fuel ◽  
Sprayed Coatings

In the field of the development of modern techniques, which improve and/or regenerate the component’s surface properties, High Velocity Oxygen Fuel (HVOF) spraying of carbides or metals and their alloys is a good alternative method to other conventional surface engineering ones, including magnesium foundry alloys. Coatings manufactured by thermal spraying are used to improve the durability and life time of machine parts, both the new and regenerated ones, by changing the surface layer properties. In this work the results of HVOF sprayed coatings deposited onto AZ31 magnesium alloy substrate are reported. The feeding material was composite powder Cr3C2–NiCr. The coatings were investigated in terms of their microstructure and selected mechanical properties. For structure examinations, microscopy studies (light and scanning ones) were used as well as phase composition analysis. In the case of mechanical properties, the wear resistance was determined also microhardness was measured.

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