US2006191603A1PendingUtilityA1

Lower strength material for MLS active layers

53
Individually held — no corporate assignee on recordPriority: Feb 25, 2005Filed: Feb 25, 2005Published: Aug 31, 2006
Est. expiryFeb 25, 2025(expired)· nominal 20-yr term from priority
Inventors:Frank Popielas
C22C 38/00C22C 19/03F16J 15/0818F16J 15/0825
53
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Claims

Abstract

An improved material for use in a gasket includes a tensile strength in a range of about 1000 MPA to about 1150 MPA and a yield strength of at least about 90% of the tensile strength.

Claims

exact text as granted — not AI-modified
1 . A material for a multi-layer steel gasket, comprising: 
 a predetermined tensile strength in a range of about 1000 MPA to about 1150 MPA; and    a predetermined range of yield strength, wherein said yield strength is greater than about 90% of said tensile strength, wherein said tensile strength of about 1000 MPA to about 1150 MPA is measured at about 70° F., and said material has a tensile strength of greater than about 700 MPA at a maximum normal operating temperature of an internal combustion engine.    
     
     
         2 . The material of  claim 1 , wherein said material has a tensile strength of greater than about 700 MPA at about 1600° F.  
     
     
         3 . The material of  claim 1 , wherein said yield strength of greater than about 90% of said tensile strength is measured at about 70° F., and said material has a yield strength greater than about 630 MPA at about 1600° F.  
     
     
         4 . The material of  claim 1 , wherein said material is a stainless steel.  
     
     
         5 . The material of  claim 1 , wherein said material is an Inconel®.  
     
     
         6 . A multi-layer steel gasket comprising: 
 a metal layer having a bead region, wherein at least a portion of said bead region has a predetermined tensile strength in a range of about 1000 MPA to about 1150 MPA, and a predetermined range of yield strength, wherein said yield strength is greater than about 90% of said tensile strength.    
     
     
         7 . The gasket of  claim 6 , wherein said tensile strength of about 1000 MPA to about 1150 MPA is measured at about 70° F., and said material has a tensile strength of greater than about 700 MPA at about 1600° F.  
     
     
         8 . The gasket of  claim 6 , wherein said yield strength of greater than about 90% of said tensile strength is measured at about 70° F., and said material has a yield strength greater than about 630 MPA at about 1600° F.  
     
     
         9 . The gasket of  claim 6 , wherein said bead region surrounds a cylinder aperture, and said gasket is selectively interposed between a cylinder head and a cylinder block of an internal combustion engine.  
     
     
         10 . The gasket of  claim 9 , wherein said bead region selectively moves relative to the cylinder block during operation of said engine.  
     
     
         11 . The gasket of  claim 6 , wherein all portions of said metal layer have a predetermined tensile strength in a range of about 1000 MPA to about 1150 MPA, and a predetermined range of yield strength is greater than about 90% of said tensile strength.  
     
     
         12 . The gasket of  claim 6 , wherein said metal layer includes a stopper region.  
     
     
         13 . The gasket of  claim 12 , wherein said stopper region circumscribes said bead region.  
     
     
         14 . The gasket of  claim 6 , wherein said metal layer includes a bolt aperture.  
     
     
         15 . The gasket of  claim 6 , wherein said bead region is formed of a stainless steel.  
     
     
         16 . A method of sealing an apparatus having a first component and a second component comprising: 
 selecting a material for a bead region of a metal layer, wherein the material that has a predetermined tensile strength in a range of about 1000 MPA to about 1150 MPA, and a predetermined range of yield strength, wherein the yield strength is greater than about 90% of the tensile strength, wherein said step of forming the metal layer includes the step of forming the bead portion;    forming the metal layer using the material; and    positioning the metal layer between the first component and the second component.    
     
     
         17 . The method of  claim 16 , wherein said step of selecting includes the step of performing a theoretical simulation of the gasket in a desired environment to identify desired physical properties of the bead portion material, and wherein the desired physical properties of the bead portion material include tensile strength and yield strength.  
     
     
         18 . The method of  claim 16 , wherein the first component is a cylinder head for an internal combustion engine.  
     
     
         19 . The method of  claim 16 , wherein said step of forming the metal layer includes the step of forming a stopper portion on a portion of the metal layer.  
     
     
         20 . The method of  claim 16 , wherein the yield strength of greater than about 90% of the tensile strength is measured at about 70° F., and the material has a yield strength greater than about 630 MPA at about 1600° F.

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