[ Post a Follow-up ][ New Thread ]

Date: 11/04/99
Posted by: Peter Kjeldsteen
E-mail: pet(at)birkeland(dot)dk(no spam)
URL: http://

I have experienced that powderproduction or sprayforming of tool steels from an aluminabased tundish can be very difficult when you have an amount greater than 700 ppm of nitrogen desolved in the steel or a protecting atmosphere of nitrogen. The zirkoniabased nozzles are within 5 to 10 minutes blocked by needleformed aluminaparticles which brakes the metalflow and causes solidification due to lack of heat. Can this blocking be caused by a chemical reaction between the alumina in the tundish and the nitrogen in the steel, which in the zirkonianozzles leads to a reduction of zirkonia by the free aluminium metal???? If you have comments or have experienced anything similar do not hesitate to contact me. I am interested in basic thermodynamic calculations as well as hearing from people who has worked with this subject in generel. Best regards and in advance thanks Peter Kjeldsteen Denmark

This message has been here for a period of time, a follow-up seems unnecessary. In this place we have stopped the functions of [post a follow-up]. To discuss and communicate your ideas/info, you may use our new message boards, please go to: Manufacturing Community

When you do want to contact the author of this message, you must replace the "(at)" with "@" and "(dot)" with "." in his/her e-mail address above. But, please do not spam...

To create a new thread, please go to the current board of discussion forums. On that page, click the [Post a Message] or [New Thread] link, then you will find the submit form.

There are more than 55 boards in our site. Please choose, according to your topics, an appropriate one to post your message. If you are new comers, we suggest you to go to our Homepage to have a clear knowledge of the subjects and the orientations of our site before you post any messages.