General Problems of Tribology of Thermal Sprayed Composite Coatings

2005 ◽  
Author(s):  
Y. A. Kharlamov ◽  
Fazli Rahman ◽  
J. A. Chattha ◽  
A. V. Shevchenko ◽  
M. Y. Kharlamov
Keyword(s):  
Surface Layer ◽  
Thermal Spray ◽  
Thermal Spray Technology ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Tribological Application ◽  
Composition And Structure ◽  
Or Methodology ◽  
Surface Layer Composition ◽  
Layer Composition

Many different methods of thermal spraying are used for deposition of coatings. The use of thermal spray technology in tribological applications is growing and will continue to grow. There is a need for a strategy or methodology for selecting a surface layer composition and structure and methods of their obtaining for a given tribological application. In this paper such a strategy is proposed and its elements are discussed.

The effect of various types of treatment on the surface layer composition in binary palladium alloys

1978 ◽  
Vol 27 (4) ◽  
pp. 658-662 ◽  
Author(s):  
E. S. Shpiro ◽  
T. S. Ustinova ◽  
V. S. Smirnov ◽  
V. M. Gryaznov ◽  
G. V. Antoshin ◽  
...  
Keyword(s):  
Surface Layer ◽  
Palladium Alloys ◽  
Surface Layer Composition ◽  
Layer Composition

Surface‐layer composition changes in sputtered alloys and compounds

1977 ◽  
Vol 30 (12) ◽  
pp. 626-628 ◽  
Author(s):  
Z. L. Liau ◽  
W. L. Brown ◽  
R. Homer ◽  
J. M. Poate
Keyword(s):  
Surface Layer ◽  
Surface Layer Composition ◽  
Alloys And Compounds ◽  
Composition Changes ◽  
Layer Composition

Surface Layer Composition Change under Irreversible Conditions of Particle Beam Action

2014 ◽  
Vol 1040 ◽  
pp. 596-601 ◽  
Author(s):  
Khan Asfandyar ◽  
Anna G. Knyazeva
Keyword(s):  
Surface Layer ◽  
Relaxation Time ◽  
Numerical Solution ◽  
Analytical Solutions ◽  
Mass Flux ◽  
Particle Beam ◽  
Composition Change ◽  
Total Problem ◽  
Surface Layer Composition ◽  
Layer Composition

The simple isothermal problem is formulated to describe the composition of surface layer change during particle beam action. The finiteness of relaxation time for mass flux is taken into account. The analytical solutions for some limiting cases are presented. Numerical solution of total problem is carried out. It is shown that concentration distributions for reactants and for reaction product depend on relation between various physical scales.

Effect of Hydrogen Absorption on the Composition of the Amorphous Alloys Surface Layers

2020 ◽  
Vol 989 ◽  
pp. 260-264
Author(s):  
V.I. Lad’yanov ◽  
N.E. Skryabina ◽  
Olga M. Kanunnikova
Keyword(s):  
Surface Layer ◽  
Amorphous Alloys ◽  
Hydrogen Absorption ◽  
Mechanical Stability ◽  
Amorphous Ribbon ◽  
Amorphous Structure ◽  
Surface Layers ◽  
Bond Polarity ◽  
Surface Layer Composition ◽  
Layer Composition

Hydrogen absorption leads to redistribution of the components of the surface layer of the amorphous alloy Fe73.8Si12.7B9.4Nb3.2Cu noncontact side, while the amorphous structure of this layer is preserved. The type of the micro-groups Fey Six changes in such a way that the ratio y: x decreases (to less than 1) and the chemical bond polarity decreases, as well. After degassing, the surface layer composition becomes similar to those before hydrogenation. The loss of the mechanical stability of the amorphous ribbon is accompanied by the formation of the micro-groups Fey Six with a decreased ratio of y: x.

USE OF IBA TECHNIQUES TO CHARACTERIZE HIGH VELOCITY THERMAL SPRAY COATINGS

2001 ◽  
Vol 15 (28n29) ◽  
pp. 1428-1436 ◽  
Author(s):  
W. TROMPETTER ◽  
A. MARKWITZ ◽  
M. HYLAND
Keyword(s):  
Thermal Spray ◽  
High Velocity ◽  
Sliding Wear ◽  
Thermal Spraying ◽  
Thermal Spray Coatings ◽  
Spray Coatings ◽  
The Past ◽  
Composition And Structure ◽  
Wide Range ◽  
Sprayed Coating

Spray coatings are being used in an increasingly wide range of industries to improve the abrasive, erosive and sliding wear of machine components. Over the past decade industries have moved to the application of supersonic high velocity thermal spray techniques. These coating techniques produce superior coating quality in comparison to other traditional techniques such as plasma spraying. To date the knowledge of the bonding processes and the structure of the particles within thermal spray coatings is very subjective. The aim of this research is to improve our understanding of these materials through the use of IBA techniques in conjunction with other materials analysis techniques. Samples were prepared by spraying a widely used commercial NiCr powder onto substrates using a HVAF (high velocity air fuel) thermal spraying technique. Detailed analysis of the composition and structure of the power particles revealed two distinct types of particles. The majority was NiCr particles with a significant minority of particles composing of SiO 2/ CrO 3. When the particles were investigated both as raw powder and in the sprayed coating, it was surprising to find that the composition of the coating meterial remained unchanged during the coating process despite the high velocity application.

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