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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2009.1
- 수록면
- 385 - 390 (6page)
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In this work, purification of commercial grade (~99.9 %) niobium by multiple Electron Beam Melting (EBM)
is reported. Impurity removal of carbon, oxygen, nitrogen, aluminum, iron, molybdenum, zirconium and tungsten
in niobium matrix is presented as a part of the ingot melting stages. The minor material loss of niobium
during melting is attributed to the amount of decarburization based on the ratio of initial and critical content
of oxygen to carbon. The analysis of nearly 60 impurity elements in niobium was carried out by glow discharge
mass spectrometry. In the end, the purity of niobium after multiple electron beam meltings was found to
be 4N while the purity enhanced from 99.9 % (3N) to 99.993 % (4N3), including gaseous impurities, and
99.98 % (3N8) to 99.998 % (4N8) without gaseous impurities. The glow discharge mass spectrometry analytical
results of purified niobium indicated that the material is suitable as input material for further processing of
fabricated superconducting radio-frequency cavities.
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