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Subject: sprayforming of steel
Posted by: Peter Kjeldsteen
E-mail: pet(at)birkeland(dot)dk(no spam)
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
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