Abstract
Removal of metallic and non-metallic impurities from zirconium with nominal purity of 99.8% has been investigated by the electron beam floating zone melting (EBFZM) in a high vacuum.Metallic impurities such as iron and chromium, being more volatile than zirconium, volatilized preferentially and their contents were reducible to below a few mass ppm after three zone passes at the zoning speed of 2 mm/min. Although no decrease of hafnium, with a slightly lower vapor pressure than zirconium, by volatilization was observed, the redistribution of hafnium, caused by segregation effect, has been found. Deoxidation of zirconium by evaporation of zirconium suboxide like ZrO was scarcely noticed, but it was found that the oxygen content was reduced to below one-half of the initial content in near the final end of the zone melted portion, due to the segregation effect. Segregation of carbon towards the final end was also found, although decarburization by the CO gas evolution was not observed. The effective distribution coefficients for oxygen and carbon at the zoning speed of 2 mm/min were estimated to be 1.5∼2 and 0.7∼0.8, respectively.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Japan Institute of Metals and Materials
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
