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Subject: sprayforming of steel

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

Message:

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

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