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Synthesis of Tungsten Heavy alloy Nanocomposite Powder by Ultrasonic-milling Process

초음파 밀링 공정을 이용한 텅스텐 중합금 나노복합분말의 제조

  • Published : 2007.04.28

Abstract

Ultrasonic-milling of metal oxide nanopowders for the preparation of tungsten heavy alloys was investigated. Milling time was selected as a major process variable. XRD results of metal oxide nanopowders ultrasonic-milled for 50 h and 100 h showed that agglomerate size reduced with increasing milling time and there was no evidence of contamination or change of composition by impurities. It was found that nanocomposite powders reduced at $800^{\circ}C$ in a hydrogen atmosphere showed a chemical composition of 93.1W-4.9Ni-2.0Fe from EDS analysis. Hardness of sintered part using 50 h and 100 h powder samples was 399 Hv and 463 Hv, respectively, which is higher than the that of commercial products (330-340 Hv).

Keywords

Tungsten heavy alloys;Ultrasonic-milling;Nanocomposite powder

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