| Titre : |
Caractérisation de la réaction interfaciale entre une couche mince de tungsèe et un substrat d'acier |
| Type de document : |
texte imprimé |
| Auteurs : |
Mourad Khechba ; Univ. de Constantine, Éditeur scientifique ; Rachid Halimi, Directeur de thèse |
| Année de publication : |
2008 |
| Importance : |
82 f. |
| Note générale : |
01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD |
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Thin films magnetron sputtering coating tungsten carbides Couches Minces pulvérisation cathodique RF revêtement tungstène carbures |
| Index. décimale : |
530 Physique |
| Résumé : |
In this work, we characterize the reaction of tungsten thin layer (6µm thickness) deposited by rf magnetron sputtering technique at 500°C, during 60min, with a steel XC70 substrate (according to AFNOR) containing 0,7 % of carbon.
The samples (thin layer of tungsten + steel substrate) were submitted to thermal treatments in vacuum at various temperatures (500°C-1000°C) and during different times. The specimens are characterized by X ray diffraction (XRD), optic microscopy, scanning electron microscopy (SEM) and by Vickers tests for the measurements of micro-hardness.
The main obtained results can be summarized as follows:
In the temperature range 500-800°C, no formation of tungsten carbides was observed. However, the annealing at a temperature greater than or equal to 900°C promotes the reaction between the constituents of the samples (W, Fe, C), and hence the formation of W2C carbide. No other compounds were detected.
The micro-hardness measured by Vickers tests, increases with the rise in temperature, particularly from 900°C. The increase in the hardness is due, probably, to the formation and growth of W2C carbide.
It is also shown that, the micro-hardness decreases with increasing of the applied load and the depth of penetration until substrate.
For thin coating (2 and 4 μm):
W2C carbide is formed with annealing at 800 ° C for 30 min for all samples.
The formation of ternary carbide Fe3W3C takes place after annealing at T≥ 900°C.
The mono carbide WC is obtained with an annealing at 1000°C for 60 min, only in
the case of the thinner coating (2 μm).
The morphology of the surface samples depends on the temperature and duration of thermal annealing. |
| Diplôme : |
Magistère |
| En ligne : |
../theses/physique/KHE5087.pdf |
| Permalink : |
index.php?lvl=notice_display&id=3468 |
Caractérisation de la réaction interfaciale entre une couche mince de tungsèe et un substrat d'acier [texte imprimé] / Mourad Khechba ; Univ. de Constantine, Éditeur scientifique ; Rachid Halimi, Directeur de thèse . - 2008 . - 82 f. 01 Disponible à la salle de recherche 02 Disponibles au magazin de la B.U.C. 01 CD Langues : Français ( fre)
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Thin films magnetron sputtering coating tungsten carbides Couches Minces pulvérisation cathodique RF revêtement tungstène carbures |
| Index. décimale : |
530 Physique |
| Résumé : |
In this work, we characterize the reaction of tungsten thin layer (6µm thickness) deposited by rf magnetron sputtering technique at 500°C, during 60min, with a steel XC70 substrate (according to AFNOR) containing 0,7 % of carbon.
The samples (thin layer of tungsten + steel substrate) were submitted to thermal treatments in vacuum at various temperatures (500°C-1000°C) and during different times. The specimens are characterized by X ray diffraction (XRD), optic microscopy, scanning electron microscopy (SEM) and by Vickers tests for the measurements of micro-hardness.
The main obtained results can be summarized as follows:
In the temperature range 500-800°C, no formation of tungsten carbides was observed. However, the annealing at a temperature greater than or equal to 900°C promotes the reaction between the constituents of the samples (W, Fe, C), and hence the formation of W2C carbide. No other compounds were detected.
The micro-hardness measured by Vickers tests, increases with the rise in temperature, particularly from 900°C. The increase in the hardness is due, probably, to the formation and growth of W2C carbide.
It is also shown that, the micro-hardness decreases with increasing of the applied load and the depth of penetration until substrate.
For thin coating (2 and 4 μm):
W2C carbide is formed with annealing at 800 ° C for 30 min for all samples.
The formation of ternary carbide Fe3W3C takes place after annealing at T≥ 900°C.
The mono carbide WC is obtained with an annealing at 1000°C for 60 min, only in
the case of the thinner coating (2 μm).
The morphology of the surface samples depends on the temperature and duration of thermal annealing. |
| Diplôme : |
Magistère |
| En ligne : |
../theses/physique/KHE5087.pdf |
| Permalink : |
index.php?lvl=notice_display&id=3468 |
|
Caractérisation de la réaction interfaciale entre une couche mince de tungsèe et un substrat d'acier
