Title:
METHOD FOR SURFACE HARDENING OF REFRACTORY METALS
Document Type and Number:
WIPO Patent Application WO/2008/079977
Kind Code:
A3
Abstract:
A process of converting an outer layer of an object made of a refractory metal, such as titanium, into a carbide of the refractory metal. A molten metal, such as molten lithium, is placed adjacent the outer surface of the object. The lithium does not react with the titanium, nor is it soluble within the titanium to any significant extent at the temperatures involved. The molten lithium contains elemental carbon, that is, free carbon atoms. At high temperature, the carbon diffuses into the titanium, and reacts with titanium atoms to form titanium carbide in an outer layer. Significantly, no other atoms are present, such as hydrogen or oxygen, which can cause problems, because they are blocked by the molten lithium.
Inventors:
BONINI JULIUS JOHN (US)
CHELLURI BHANUMATHI (US)
KNOTH EDWARD ARLEN (US)
CHELLURI BHANUMATHI (US)
KNOTH EDWARD ARLEN (US)
Application Number:
PCT/US2007/088378
Publication Date:
December 16, 2010
Filing Date:
December 20, 2007
Export Citation:
Assignee:
IAP RES INC (US)
BONINI JULIUS JOHN (US)
CHELLURI BHANUMATHI (US)
KNOTH EDWARD ARLEN (US)
BONINI JULIUS JOHN (US)
CHELLURI BHANUMATHI (US)
KNOTH EDWARD ARLEN (US)
International Classes:
C23C8/44; C23C8/54; C23C8/58; C23C10/24; C23C10/26
Foreign References:
| US5290368A | 1994-03-01 | |||
| EP0464265A1 | 1992-01-08 | |||
| US2453896A | 1948-11-16 |
Attorney, Agent or Firm:
JENKINS, Matthew, R. et al. (Meckstroth & Jenkins2310 Far Hills Avenu, Dayton OH, US)
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