Method for treating a contact surface for a mullite-based refractory recipient, and a coating made with this method
AssigneeSnecma Moteurs
InventorsChristian Marty, Umberto Aprile
Life of this patent
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Abstract
The invention proposes a method for passivating the contact surface of a refractory container made of mullite. Such a method is remarkable in that it comprises the following operations: a. application to the contact surface of a coating comprising 50% to 70% by weight of alumina flour (Al2O3) filler and 30% to 50% of binder, this binder itself comprising 50% to 60% of aluminum chloride AlCl3 dissolved in 40% to 50% of water; b. drying; c. firing of the container in an oxidizing atmosphere between 1450° C. and 1550° C. for at least 20 min. Application to the casting of titanium alloys.
Claims8
A method for passivating the contact surface of a refractory container made mainly of mullite, which comprises the following operations:
- a. application to the contact surface of a coating comprising 50% to 70% by weight of alumina flour (Al2O3) filler and 30% to 50% of binder, this binder itself comprising 50% to 60% of aluminum chloride AlCl3 dissolved in 40% to 50% of water;
- b. drying;
- c. firing of the container in an oxidizing atmosphere between 1450° C. and 1550° C. for at least 20 minutes.
A coating used in the method claimed, which comprises 50% to 70% by weight of alumina flour (Al2O3) filler and 30% to 50% of binder, this binder itself comprising 50% to 60% of aluminum chloride AlCl3 dissolved in 40% to 50% of water.
Dependencies are inferred from the claim text.