Permeable refractory nozzle and manufacturing method
OwnerBruce E. Dunworthinventor
Life of this patent
Estimating the term…
Abstract
A permeable nozzle is made from MgO and MgO—Al2O3 spinel and has a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute. In one embodiment, the permeable nozzle comprises about 50%-80% of about a 20-48×100 mesh MgO, about 5%-20% of about a 325 mesh MgO and about 5%-40% of about a 48×200 mesh MgO—Al2O3 spinel. In another embodiment, the permeable nozzle comprises about 10%-20% of about a 20-48×100 mesh MgO, about 0%-10% of about a 325 mesh MgO, about 30%-60% of about a 28×48 mesh MgO—Al2O3 spinel, about 10%-40% of about a 48×200 mesh MgO—Al2O3 spinel, and about 10%-20% of about a 325 mesh MgO—Al2O3 spinel.
Claims28
A permeable nozzle for directing a flow of molten metal from a tundish or other receptacle comprising about 50%-80% of about a 20-48×100 mesh MgO, about 5%-20% of about a 325 mesh MgO and about 5%-40% of about a 20-48×200 mesh MgO—Al2O3 spinel, the permeable nozzle having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute.
A method of making a permeable nozzle comprising:
- blending a mixture of refractory particles of about 50%-80% of about a 20-48×100 mesh MgO, about 5%-20% of about a 325 mesh MgO and about 5%-40% of about a 20-48×200 mesh MgO—Al2O3 spinel;
- mixing a plasticizer/binder and liquid with the blended mixture such that the blended mixture has a consistency tending to retain a fixed shaped after forming;
- working the blended mixture into a form of the permeable nozzle;
- drying the form of the permeable nozzle;
- and
- firing the dried form of the permeable nozzle at a temperature sufficiently high to sinter the refractory particles together to form the permeable nozzle having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute.
A permeable nozzle comprising about 50%-80% of about a 20-48×100 mesh MgO, about 5%-20% of about a 325 mesh MgO and about 5%-40% of about a 20-48×200 mesh MgO—Al2O3 spinel, the permeable nozzle having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute and the permeable nozzle being made by the method of:
- blending a mixture of refractory particles of about 50%-80% of about a 20-48×100 mesh MgO, about 5%-20% of about a 325 mesh MgO and about 5%-40% of about a 20-48×200 mesh MgO—Al2O3 spinel;
- mixing a plasticizer/binder and liquid with the blended mixture such that the blended mixture has a consistency tending to retain a fixed shaped after forming;
- working the blended mixture into a form of the permeable nozzle;
- drying the form of the permeable nozzle;
- and
- firing the dried form of the permeable nozzle at a temperature sufficiently high to sinter the refractory particles together to form the permeable nozzle.
A permeable nozzle for directing a flow of molten metal from a tundish or other receptacle comprising:
- a permeable nozzle insert having an inner surface defining a bore extending therethrough and an outer surface, the permeable nozzle comprising about 50%-80% of about a 20-48×100 mesh MgO, about 5%-20% of about a 325 mesh MgO and about 5%-40% of about a 20-48×200 mesh MgO—Al2O3 spinel, the permeable nozzle insert having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute;
- a metal housing surrounding a portion of the permeable nozzle insert and forming a space between the metal housing and the permeable nozzle insert;
- a fitting mounted in and extending through the metal housing, the fitting having an outlet extending into the space, the fitting adapted to be connected to a source of inert gas and in fluid communication with the outer surface of the permeable nozzle insert, thereby providing a flow of the inert gas to the permeable nozzle insert;
- and
- a material disposed in the space between the metal housing and the permeable nozzle insert and being cast around the outlet of the fitting extending between the metal housing and the permeable nozzle.
A permeable nozzle for directing a flow of molten metal from a tundish or other receptacle comprising:
- a permeable nozzle insert having an inner surface defining a conduit extending therethrough and an outer surface, the permeable nozzle comprising about 10%-20% of about a 20-48×100 mesh MgO, about 0%-10% of about a 325 mesh MgO, about 30%-60% of about a 28×48 mesh MgO—Al2O3 spinel, about 10%-40% of about a 48×200 mesh MgO—Al2O3 spinel, and about 10%-20% of about a 325 mesh MgO—Al2O3 spinel, the permeable nozzle insert having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute;
- a metal housing surrounding a portion of the permeable nozzle insert and forming a space between the metal housing and the permeable nozzle insert;
- a fitting mounted in and extending through the metal housing, the fitting having an outlet extending into the space, the fitting adapted to be connected to a source of inert gas and in fluid communication with the outer surface of the permeable nozzle insert, thereby providing a flow of the inert gas to the permeable nozzle insert;
- and
- a material disposed in the space between the metal housing and the permeable nozzle insert and being cast around the outlet of the fitting extending between the metal housing and the permeable nozzle.
A permeable nozzle for directing a flow of molten metal from a tundish or other receptacle comprising:
- a permeable nozzle insert having an inner surface defining a conduit extending therethrough and an outer surface, the permeable nozzle comprising MgO and MgO—Al2O3 spinel, and the permeable nozzle insert having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute;
- a metal housing surrounding a portion of the permeable nozzle insert and forming a space between the metal housing and the permeable nozzle insert;
- a fitting mounted in and extending through the metal housing, the fitting having an outlet extending into the space, the fitting adapted to be connected to a source of inert gas and in fluid communication with the outer surface of the permeable nozzle insert, thereby providing a flow of the inert gas to the permeable nozzle insert;
- and
- a material disposed in the space between the metal housing and the permeable nozzle insert and being cast around the outlet of the fitting extending between the metal housing and the permeable nozzle.
A permeable nozzle for directing a flow of molten metal from a tundish or other receptacle comprising about 10%-20% of about a 20-48×100 mesh MgO, about 0%-10% of about a 325 mesh MgO, about 30%-60% of 28×48 mesh MgO—Al2O3 spinel, about 10%-40% of about a 48×200 mesh MgO—Al2O3 spinel, and about 10%-20% of about a 325 mesh MgO—Al2O3 spinel, the permeable nozzle having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute.
A method of making a permeable nozzle comprising:
- blending a mixture of refractory particles of about 10%-20% of about a 20-48×100 mesh MgO, about 0%-10% of about a 325 mesh MgO, about 30%-60% of about a 28×48 mesh MgO—Al2O3 spinel, about 10%-40% of about a 48×200 mesh MgO—Al2O3 spinel, and about 10%-20% of about a 325 mesh MgO—Al2O3 spinel;
- mixing a plasticizer/binder and liquid with the blended mixture such that the blended mixture has a consistency tending to retain a fixed shaped after forming;
- working the blended mixture into a form of the permeable nozzle;
- drying the form of the permeable nozzle;
- and
- firing the dried form of the permeable nozzle at a temperature sufficiently high to sinter the refractory particles together to form the permeable nozzle having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute.
A permeable nozzle comprising about 10%-20% of about a 20-48×100 mesh MgO, about 0%-10% of about a 325 mesh MgO, about 30%-60% of about a 28×48 mesh MgO—Al2O3 spinel, about 10%-40% of about a 48×200 mesh fused MgO—Al2O3 spine, and about 10%-20% of about a 325 mesh MgO—Al2O3 spinel, the permeable nozzle having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute and the permeable nozzle being made by the method of:
- blending a mixture of refractory particles of about 10%-20% of about a 20-48×100 mesh MgO, about 0%-10% of about a 325 mesh MgO, about 30%-60% of about a 28×48 mesh MgO—Al2O3 spinel, about 10%-40% of about a 48×200 mesh fused MgO—Al2O3 spinel, and about 10%-20% of about a 325 mesh MgO—Al2O3 spinel;
- mixing a plasticizer/binder and liquid with the blended mixture such that the blended mixture has a consistency tending to retain a fixed shaped after forming;
- working the blended mixture into a form of the permeable nozzle;
- drying the form of the permeable nozzle;
- and
- firing the dried form of the permeable nozzle at a temperature sufficiently high to sinter the refractory particles together to form the permeable nozzle.
A permeable nozzle for directing a flow of molten metal from a tundish or other receptacle comprising:
- a permeable nozzle insert having an inner surface defining a conduit extending therethrough and an outer surface, the permeable nozzle comprising MgO and MgO—Al2O3 spinel, and the permeable nozzle insert having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute;
- a housing surrounding a portion of the permeable nozzle insert and forming a space between the housing and the permeable nozzle insert;
- a fitting mounted in and extending through the housing, the fitting comprising an outlet extending into the space, and the fitting is adapted to be connected to a source of inert gas;
- and
- a nozzle body material disposed in the space between the metal housing and the permeable nozzle insert, the nozzle body material comprising a channel extending over the outer surface of the nozzle insert, the channel being in fluid communication with the outlet of the fitting and providing a flow of the inert gas to the permeable nozzle insert.
A method of making a permeable nozzle comprising:
- blending a mixture of refractory particles comprising MgO and MgO—Al2O3 spinel;
- mixing a plasticizer/binderand liquid with the blended mixture such that the blended mixture has a consistency tending to retain a fixed shaped after forming;
- working the blended mixture into a permeable nozzle form;
- drying the permeable nozzle form;
- firing the permeable nozzle form at a temperature sufficiently high to sinter the refractory particles together to form a permeable nozzle having a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute;
- placing a formable material on an outer surface of the permeable nozzle at a desired location for an inert gas flow channel;
- placing a housing around the permeable nozzle, the housing having a fitting mounted in and extending through the housing, the fitting having an outlet immediately adjacent the material;
- disposing a nozzle body material in a space between the housing and the permeable nozzle;
- and
- melting the formable material to provide the inert gas flow channel in the casting material on the outer surface of the permeable nozzle.
Dependencies are inferred from the claim text.