US2003041922A1PendingUtilityA1

Method of strengthening Ti alloy

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Assignee: FUJI VALVEPriority: Sep 3, 2001Filed: Mar 28, 2002Published: Mar 6, 2003
Est. expirySep 3, 2021(expired)· nominal 20-yr term from priority
Inventors:Masahito HiroseHiroaki Asanuma
C23C 8/28
40
PatentIndex Score
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Claims

Abstract

Ti alloy is heated in an atmosphere of CO 2 in a heating furnace. O and C atoms are introduced into the Ti alloy to harden it without forming Ti oxide, thereby increasing hardness by Ti—O and Ti—C solid solutions thus formed.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A method of strengthening Ti alloy, comprising the step of: 
 heating the Ti alloy in an atmosphere of CO 2  at 600 to 900° C. in a heating furnace to diffuse C and O atoms into the Ti alloy.    
     
     
         2 . A method as claimed in  claim 1  wherein the method is carried out for 0.5 to 50 hours.  
     
     
         3 . A method as claimed in  claim 1  wherein the method is carried out at 800 to 850° C.  
     
     
         4 . A method as claimed in  claim 3  wherein the method is carried out for 1 to 3 hours.  
     
     
         5 . A method as claimed in  claim 1  wherein CO 2  is always introduced into the heating furnace.  
     
     
         6 . A method as claimed in  claim 1  wherein the method is carried out at about 800° C. for 1 to 2 hours.  
     
     
         7 . A method as claimed in  claim 6  wherein the Ti alloy is used to make a poppet valve in an internal combustion engine.

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