Composite nozzle assembly for conducting a flow of molten metal

Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – With means to discharge molten material

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

222591, 222594, B22D 4154

Patent

active

051868865

ABSTRACT:
A composite nozzle assembly for conducting a flow of molten steel in an electromagnetic valve is provided which comprises an inner nozzle shell formed from a ceramic material having high erosion-resistance but which undergoes internal tensile stresses of a magnitude sufficient to promote cracking when subjected to the thermal stresses caused by the flow of the molten metal, in combination with an outer nozzle shell that contains and closely engages the inner nozzle shell for applying a compressive load to the inner nozzle shell upon the initial flow of the molten metal through the shell in order to counteract the thermally induced tensile stresses and thereby prevent cracking. The outer nozzle shell is preferably formed from a ceramic material having superior thermal shock properties but yet which has a thermal coefficient of expansion about the same as that associated with the ceramic material forming the inner nozzle shell to minimize stresses at the interface of the inner and outer shells after thermal steady state has been attained. Additionally, the relative thickness of the outer nozzle shell is between about three and ten times that of the inner shell. In a preferred embodiment of the invention, the inner shell is formed from zirconia, while the outer shell is formed from boron nitride.

REFERENCES:
patent: 3735906 (1973-05-01), Zettlemoyer et al.
patent: 4324266 (1982-04-01), Garnier et al.
patent: 4655237 (1987-04-01), Gloor et al.
patent: 4805669 (1989-02-01), Lillicrap
patent: 4842170 (1989-06-01), Del Vecchio et al.
patent: 4888313 (1989-12-01), Adams et al.
patent: 4897112 (1990-01-01), Ekerot et al.
patent: 4928933 (1990-05-01), Motomura
patent: 4951929 (1990-08-01), Schwarz et al.
patent: 4961455 (1990-10-01), Redemske et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Composite nozzle assembly for conducting a flow of molten metal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Composite nozzle assembly for conducting a flow of molten metal , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite nozzle assembly for conducting a flow of molten metal will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2146650

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.