LAMELLAR CRUCIBLE FOR INDUCTION MELTING TITANIUM

• US 3,734,480 A
• Filed: 02/08/1972
• Issued: 05/22/1973
• Est. Priority Date: 02/08/1972
• Status: Expired due to Term

• Current Assignee: Charles A. Zanis, Richard L. Helferich
• Original Assignee: Charles A. Zanis, Richard L. Helferich
• Inventors: Zanis, Charles A., Helferich, Richard L.
• Primary Examiner(s): Dost, Gerald A.
• Application Number:
  US05/224,537
• Time in Patent Office: 469 Days
• Field of Search: 263/48 266/39,43 164/52,68
• US Class Current: 266/275
• CPC Class Codes: F27B 14/10 Crucibles
• CPC Class Codes: F27B 2014/104 Crucible linings
• CPC Class Codes: F27D 1/0006 Linings or walls formed from bricks or layers with a particular composition or specific characteristics
• CPC Class Codes: Y10S 266/905 Refractory metal-extracting means

Abstract

A lamellar crucible for induction melting titanium has an outer graphite shell closed at one end to form inner and outer surfaces. A first layer generally of the class of refractory metals or of beryllium oxide covers the inner surface of the shell to limit carbon contamination. A second layer is preferably oxygen deficient yttrium oxide and may also be generally of the class of rare earth metal oxides in an oxygen deficient condition. Also, the second layer may be yttrium oxide or the rare earth metal oxides. The second layer covers the first layer to limit reactivity with the molten titanium.

Claims

2. The crucible of claim 1, wherein the outer shell comprises a graphite cylinder.

3. The crucible of claim 2 wherein the graphite has an ash content of less than 0.04 percent.

4. The crucible of claim 3 wherein the graphite has a density of at least 1.5 grams per cubIc centimeter.