Modification of the surface morphology of atmospheric plasma sprayed tungsten coating for X-ray tube application

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AZHDARI S.; SHAHRIARI NOGORANI F.

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Paper Information

Journal: JOURNAL OF NEW MATERIALS Year:2018 | Volume:8 | Issue:4 (32) Page(s): 137-145

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Title

Modification of the surface morphology of atmospheric plasma sprayed tungsten coating for X-ray tube application

Author(s)

AZHDARI S. | SHAHRIARI NOGORANI F. | Issue Writer Certificate

Keywords

Atmospheric Plasma Spraying (APS)Q2

Chemical Vapor Deposition (CVD)Q1

Annealing in hydrogen atmosphereQ1

APS-WcoatingQ1

Abstract

Thick tungsten coatings are used in diagnostic X-ray tube anode applications. Surface roughness has an important role in producing high quality diagnostic images, therefore it is crucial to develop and maintain a smooth anode surface. In order to improve the efficiency of such tubes, surface morphology of the plasma sprayed tungsten coatings was studied in the as-sprayed conditions, hydrogen annealed and top-coated with a chemically vapor deposited tungsten film. Hydrogen annealing was carried out in a wet hydrogen atmosphere at 1500 ° C for 90 minutes. Chemical vapor deposition was carried out in a bed of tungsten oxide at 1000 ° C. Surface morphology was evaluated by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometry and stylus-type roughness measurement instrument. The results showed that the suggested post treatments could alter the surface morphology from an oxidized and rough surface to a metallic and smooth morphology. The surface of the final coating was covered by a thin layer of fine tungsten crystals with average roughness of less than 1 micrometer.

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APA: Copy

AZHDARI, S., & SHAHRIARI NOGORANI, F.. (2018). Modification of the surface morphology of atmospheric plasma sprayed tungsten coating for X-ray tube application. JOURNAL OF NEW MATERIALS, 8(4 (32) ), 137-145. SID. https://sid.ir/paper/169870/en

Vancouver: Copy

AZHDARI S., SHAHRIARI NOGORANI F.. Modification of the surface morphology of atmospheric plasma sprayed tungsten coating for X-ray tube application. JOURNAL OF NEW MATERIALS[Internet]. 2018;8(4 (32) ):137-145. Available from: https://sid.ir/paper/169870/en

IEEE: Copy

S. AZHDARI, and F. SHAHRIARI NOGORANI, “Modification of the surface morphology of atmospheric plasma sprayed tungsten coating for X-ray tube application,” JOURNAL OF NEW MATERIALS, vol. 8, no. 4 (32) , pp. 137–145, 2018, [Online]. Available: https://sid.ir/paper/169870/en

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