scholarly journals Influence of gas detonation spraying parameters on the geometrical structure of Fe-Al intermetallic protective coatings

2019 ◽  
Author(s):  
Tomasz Chrostek ◽  
Mirosław Bramowicz ◽  
Kazimierz Rychlik ◽  
Wojtkowiak Adam ◽  
Cezary Senderowski
Keyword(s):  
Fractal Dimension ◽  
Geometric Structure ◽  
Geometrical Structure ◽  
Protective Coatings ◽  
Sampling Rate ◽  
Roughness Parameter ◽  
Powder Injection ◽  
Science Center ◽  
Detonation Spraying ◽  
Gas Detonation

The paper presents the results of an investigation and analysis of the geometrical structure of Fe-Al intermetallic protective coatings sprayed under specified gun detonation spraying (GDS) conditions. As GDS variable parameters there were applied two different barrel lengths and two powder injection position (PIP) at the moment of spark detonation as well as two different number of GDS shots with 6.66 Hz frequency. The measurements of the surface's profile were carried out through means of contact profilometry, in which case TOPO-01 system and Mitutoyo SJ 210 profilometer were applied. On the basis of the measurements conducted the analysis of in two-dimensional (2D) and spatial (3D) systems was made possible. The authors assumed that roughness can be considered as a non-stationary parameter of variance of surface amplitude, which is highly dependent on the sampling rate and length of an elementary segments. Therefore, the changes in the amplitude parameters and functional properties of the surface at different lengths of measuring segments (ln), respectively: 1.25, 4 and 12.5 mm, were analyzed. In the analysis of the degree of development of the geometric structure of the surface, the RMS (Root Mean Square) fractal method was used, with an assessment of the geometric structure of the surface stretched over several size levels, taking into account the correlation between the roughness parameter Rq, the measuring length (ln) and the fractal dimension (D). The application of the RMS method with the determination of the fractal dimension (D) allowed for the characterization of the geometric structure of intermetallic Fe-Al protective coatings detonation sprayed under specific conditions of the GDS process - based on the surface roughness profiles of different measured length (ln). Research undertaken within the framework of project No. 2015/19 / B / ST8 / 02000 subsidized by the National Science Center of Poland.

scholarly journals Tribological wear of Fe-Al coatings applied by gas detonation spraying

2021 ◽  
Author(s):  
Tomasz Chrostek
Keyword(s):  
Dry Friction ◽  
Shear Stresses ◽  
X Ray Diffraction ◽  
Detonation Spraying ◽  
Gas Detonation ◽  
Compressive Stresses ◽  
Spraying Parameters ◽  
Thin Oxide Films ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Comparative tests of gas detonation (GDS) coatings were carried out in order to investigate the influence of spraying parameters on abrasive wear under dry friction conditions. The tests were carried out using the pin-on-disc (PoD) method at room temperature. The microstructure of the coatings was analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM / EDS) methods. The results showed that with specific GDS process parameters, the main phases in both coatings were FeAl and Fe3Al involving thin oxide films Al2O3. The tribological tests proved that the coatings sprayed with the shorter barrel of the GDS gun showed higher wear resistance. The coefficient of friction was slightly lower in the case of coatings sprayed with the longer barrel of the GDS gun. During dry friction, oxide layers form on the surface, which act as a solid lubricant. The load applied to the samples during the tests causes shear stresses, thus increasing the wear of the coatings. During friction, the surface of the coatings is subjected to alternating tensile and compressive stresses, which lead to delamination and is the main wear mechanism of the coatings.

EPR and Raman study of silicon layers obtained by gas detonation spraying

2017 ◽  
Vol 71 ◽  
pp. 232-239 ◽  
Author(s):  
N.I. Klyui ◽  
V.Ya. Bratus ◽  
V.P. Temchenko ◽  
V.B. Lozinskii ◽  
V.O. Yukhymchuk ◽  
...  
Keyword(s):  
Detonation Spraying ◽  
Gas Detonation ◽  
Raman Study ◽  
Gas Detonation Spraying

Restoration of drying cylinders on spinning machines by gas detonation spraying

2008 ◽  
Vol 40 (6) ◽  
pp. 545-547 ◽  
Author(s):  
D. V. Min’kov ◽  
V. Yu. Lakunin ◽  
S. T. Kartashov ◽  
O. M. Bashkirov ◽  
A. S. Ivanov ◽  
...  
Keyword(s):  
Detonation Spraying ◽  
Gas Detonation ◽  
Gas Detonation Spraying

3D Fractal Analysis of Ultra Precision Grinding Influencing on the Surface Topography of Brittle Material

2007 ◽  
Vol 359-360 ◽  
pp. 523-527 ◽  
Author(s):  
Ming Jun Chen ◽  
Qi Long Pang ◽  
Jing He Wang ◽  
Kai Cheng
Keyword(s):  
Fractal Dimension ◽  
Surface Topography ◽  
Brittle Material ◽  
Roughness Parameter ◽  
Ground Surface ◽  
Inverse Relation ◽  
Precision Grinding ◽  
Fractal Method ◽  
Grinding Parameters ◽  
Ultra Precision

3Dfractal dimension and 2D profile fractal dimension distribution of the surfaces made by brittle or ductile grinding are calculated. From the calculated results of 3D fractal dimension, it can be found that the microtopograhpy of ductile ground surface is more exquisite than brittle ground surface and 3D fractal dimension Ds has inverse relation with the roughness parameter Rq. Through the analysis of 2D profile fractal dimension distribution in different ground surfaces, it is revealed that the topography of ground surface is changed with grinding parameters such as ground surfaces may have weakly or strongly anisotropic even isotropic features when different grinding parameters are adopted. Using fractal method to analyze the topography of ground surface is helpful to understand the generating mechanism of surface topography.

Computational Code for Detonation Spraying Process

1998 ◽  
Author(s):  
T.P. Gavrilenko ◽  
Y.A. Nikolaev ◽  
V.Y. Ulianitsky ◽  
M.C. Kim ◽  
J.W. Hong
Keyword(s):  
Gaseous Mixture ◽  
Gaseous Detonation ◽  
Powder Injection ◽  
Powder Materials ◽  
Productivity Analysis ◽  
Detonation Spraying ◽  
Injection Point ◽  
High Productivity ◽  
Product Flow ◽  
Computational Code

Abstract Interactive Computational Code is presented that provides a high-productivity analysis of the complex detonation spraying technology. It is based on exact gas dynamics theory taking into account chemical reactions for description of the gaseous detonation phenomena. It deals with specific features of the process like non-homogeneity of gaseous mixture compositions due to gas filling operation and powder injection into the barrel. Acceleration and heating of powder particles by the detonation product flow were simulated including particle melting, fragmentation and vaporization. Calculations for different fuels and powder materials were accomplished. Optimum conditions (gas mixture, barrel length, powder injection point, etc.) to provide highest velocity and appropriate temperature for typical metal and cermet powders are discussed. The conditions for coating formation by the detonation gun «Ob» were established and samples were produced. Experimental data on detonation coating properties are presented to prove the theoretical results.

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