| Titre : |
Applications of X-ray diffraction and fluorescence techniques in coatings industries |
| Type de document : |
texte imprimé |
| Auteurs : |
G. Bathiri, Auteur |
| Année de publication : |
2001 |
| Article en page(s) : |
p. 33-40 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Tags : |
'Matériau revêtement' Peinture Feuil 'Analyse chimique' Pigment quantitative' qualitative' 'Détection défaut' Cristallinité surface' 'Diffraction RX' 'Spectrométrie fluorescence |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
X-ray diffraction spectroscopy (XRD) and X-ray fluorescence spectroscopy (XRF) are very useful techniques in the characterisation of materials. In XRD, the angle of diffraction of X-ray is measured after allowing X-rays to be incident on the material under testing. The distance between layer of atoms (d) then can be calculated using Bragg's equation. Plot of intensity vs d - value gives XRD spectrum. In XRF, X-rays of high wavelength are emitted by the specimen as a result of transition of electrons between orbitals when bombarded by low wavelength X-rays. XRF spectrum is a plot of intensity as a function of either energy or wavelength. XRD & XRF spectra are characteristics of materials and form the basis of their analysis. In coatings XRD is useful in establishing the identity and determining the purity of pigments. The technique is useful for analysis of polymorphic forms in titanium dioxides (rutile and anatase) and copper phthalocyanines (alpha, beta and gamma). XRD has also been used in the determination of identity and amount of pretreatment on metal or in general, crystalline coatings on substrate. XRD also finds use in identifying coating defects. XRF can act as a supporting tool to XRD and can be useful in determination of various elements used in coatings in wider range from ppm to 100%. Both XRD and XRF are useful in coating industry as research, quality control and problem analysis tool. Although these techniques are expensive, their simplicity of operations, speed and ability to give selective information make them a very powerful analytical tool for study of coatings. |
| Note de contenu : |
- INSTRUMENTATION FOR X-RAY TECHNIQUES
- X-RAY DIFFRACTION : Bragg's law
- APPLICATIONS OF X-RAY DIFFRACTION ANALYSIS : Identification of pigments - Quantitative analysis of pigment mixtures - Determination of anatase TiO2 content in rutile TiO2 - Study of polymorphism - Use of XRD for tracking coating defect - Characterisation of metal pretreatment and other thin coatings - Crystallinity of polymers - Particle size - Monitoring of chemical reactions.
- X-RAY FLUORESCENCE SPECTROSCOPY : Qualitative analysis - Quantitative anlaysis
- APPLICATIONS OF X-RAY FLUORESCENCE SPECTROMETRY : Support for X-ray diffraction analysis - Analysis of elements in solution - Quality control
- ADVANTAGES AND DISADVANTAGES OF XRF |
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in PAINTINDIA > Vol. LI, N° 9 (09/2001) . - p. 33-40
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Applications of X-ray diffraction and fluorescence techniques in coatings industries in PAINTINDIA, Vol. LI, N° 9 (09/2001)
