Publication detail

Defects in the surface layer of pure molybdenum after WEDM

MOURALOVÁ, K. BENEŠ, L. ZAHRADNÍČEK, R.

Czech title

Defekty povrchové vrstvy čistého molybdenum po obrábění WEDM

English title

Defects in the surface layer of pure molybdenum after WEDM

Type

journal article in Scopus

Language

en

Original abstract

The utilisation of pure molybdenum in high-temperature applications in a vacuum requires very precise machining. Considering the fact that conventional machining methods do not achieve the required geometrical and dimensional accuracy in several cases, it is necessary to use the unconventional technology of wire electrical discharge machining (WEDM). This study aims at analysing the surface and subsurface layer of pure molybdenum after WEDM in terms of the occurrence of defects. Profile and areal parameters were evaluated by means of a contact 3D profilometer. The occurrence of individual defects both on the surface and underneath it was studied by means of the methods of electron microscopy and focused ion beam (FIB). Furthermore, the local chemical composition of the surface of the workpiece (EDX) was determined.

Czech abstract

Využití čistého molybdenu v oblasti vysokoteplotních aplikací ve vakuu vyžaduje velmi přesné obrobení. Vzhle-dem k tomu, že konveční metody obrábění v několika případech nedosahují požadované tvarové a rozměrové přesnosti je nezbytné využítí nekonveční technologii elektroerozivního drátového řezaní (WEDM). Cílem této studie je analýza povrchové a podpovrchové vrstvy čistého molybdenu po obrábění WEDM zhlediska vyskytu defektů. Pomocí kontaktního 3D profilometru byly vyhodnoceny profilové a plošné parametry. Výskyt jednotli-vých defektů na povrchu i pod ním byl studován pomocí metod elektronové mikroskopie a fokusovaného ionto-vého svazku (FIB). Dále bylo stanoveno lokalní chemické složení povrchu obrobku (EDX).

English abstract

The utilisation of pure molybdenum in high-temperature applications in a vacuum requires very precise machining. Considering the fact that conventional machining methods do not achieve the required geometrical and dimensional accuracy in several cases, it is necessary to use the unconventional technology of wire electrical discharge machining (WEDM). This study aims at analysing the surface and subsurface layer of pure molybdenum after WEDM in terms of the occurrence of defects. Profile and areal parameters were evaluated by means of a contact 3D profilometer. The occurrence of individual defects both on the surface and underneath it was studied by means of the methods of electron microscopy and focused ion beam (FIB). Furthermore, the local chemical composition of the surface of the workpiece (EDX) was determined.

Keywords in Czech

WEDM, elektroerozivní obrábění, čistý molybdén, morfologie povrchu, topografie, chemické složení, trhliny

Keywords in English

WEDM, Electrical Discharge Machining, pure molybdenum, morphology of surface, topography, chemical composion, cracks

Released

07.10.2017

Publisher

UJEP

Location

Ústí nad Labem

ISSN

1213-2489

Volume

2017

Number

5

Pages from–to

786–790

Pages count

5

BIBTEX


@article{BUT140163,
  author="Kateřina {Mouralová} and Libor {Beneš} and Jiří {Kovář} and Zdeněk {Karpíšek} and Radim {Zahradníček} and Pavel {Kousal},
  title="Defects in the surface layer of pure molybdenum after WEDM ",
  year="2017",
  volume="2017",
  number="5",
  month="October",
  pages="786--790",
  publisher="UJEP",
  address="Ústí nad Labem",
  issn="1213-2489"
}