| Friction stir fabrication -> Monitor Keywords |
|
|
  Friction stir fabricationRelated Patent Categories: Metal Fusion Bonding, ProcessThe Patent Description & Claims data below is from USPTO Patent Application 20080041921. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/720,521 filed Sep. 26, 2005, which is incorporated herein by reference. FIELD OF THE INVENTION [0003] The present invention relates to friction stir fabrication, and more particularly relates to coating, surface modification and repair of substrates using friction stirring techniques, as well as the production of friction stir rod stock. BACKGROUND INFORMATION [0004] Conventional thermal spray coating techniques, such as flame spray, high-velocity oxygen fuel (HVOF), detonation-gun (D-Gun), wire arc and plasma deposition, produce coatings that have considerable porosity, significant oxide content and discrete interfaces between the coating and substrate. These coating processes operate at relatively high temperatures and melt/oxidize the material as it is deposited onto the substrate. Such conventional techniques are not suitable for processing many types of substrates and coating materials, such as nanocrystalline materials due to the grain growth and loss of strength resulting from the relatively high processing temperatures. SUMMARY OF THE INVENTION [0005] One embodiment of the present invention provides a low-temperature friction-based coating method termed friction stir fabrication (FSF), in which material is deposited onto a substrate and subsequently stirred into the substrate using friction stir processing to homogenize and refine the microstructure. This solid-state process is capable of depositing coatings, including nanocrystalline aluminum and/or metal matrix composites and the like, onto substrates such as aluminum at relatively low temperatures. For example, friction stir fabrication may be used to add new material to the surfaces of 2519 and 5083 Al, thus modifying the surface compositions to address multiple application requirements. Coatings produced using FSF have superior bond strength, density, and lower oxide content as compared to other coating technologies in use today. The friction stir fabrication process may also be used to fill holes in various types of substrates. The present invention also provides a method of making friction stirring rod stock. [0006] An aspect of the present invention is to provide a method of forming a surface layer on a substrate. The method comprises depositing a coating material on the substrate, and friction stirring the deposited coating material. [0007] Another aspect of the present invention is to provide a method of filling a hole in a substrate. The method comprises placing powder of a fill material in the hole, and friction stirring the fill material powder in the hole to consolidate the fill material. [0008] A further aspect of the present invention is to provide a method of making consumable friction stirring rod stock. The method comprises placing powder of a coating material in a die, friction stirring the coating material powder in the die to consolidate the coating material, and recovering a rod comprising the consolidated coating material. [0009] These and other aspects of the present invention will be more apparent from the following description. BRIEF DESCRIPTION OF THE DRAWINGS [0010] FIGS. 1a-1d schematically illustrate a friction stir fabrication process in accordance with an embodiment of the present invention. [0011] FIGS. 2a-2f schematically illustrate a friction stir hole repair method in accordance with an embodiment of the present invention. [0012] FIGS. 3a-3d schematically illustrate a method of making a consumable friction stirring rod in accordance with an embodiment of the present invention. [0013] FIG. 4 illustrates stress-strain curves for a 5083 Al substrate material and a 5083 Al nanocrystalline interface for a friction stir coated sample produced in accordance with an embodiment of the present invention. [0014] FIG. 5 is a photomicrograph of a polished friction stir fabricated 5083 Al sample corresponding to FIG. 4. [0015] FIG. 6 is a photomicrograph of an etched friction stir fabricated 5083 Al sample corresponding to FIG. 4. [0016] FIG. 7 illustrates stress-strain curves for a 5083 Al substrate and a friction stir fabricated 6063 Al--SiC (10 volume percent) coating deposited on a 5083 Al substrate. [0017] FIG. 8 is a photomicrograph of a 5083 Al/6063 Al--SiC (10 volume percent) friction stir fabricated sample corresponding to FIG. 7, showing the substrate, friction stir fabricated coating, and interfacial region therebetween. [0018] FIG. 9 is a photomicrograph of a 2519 Al substrate friction stir coated with a 6063 Al--SiC metal matrix composite in accordance with an embodiment of the present invention, including magnified regions thereof. [0019] FIG. 10 is a series of photomicrographs of an Al--SiC friction stirred coating in accordance with an embodiment of the present invention. [0020] FIG. 11 is a photomicrograph of a 6063 Al friction stirred coating on a 2519 Al substrate produced in accordance with an embodiment of the present invention. Continue reading... Full patent description for Friction stir fabrication Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Friction stir fabrication patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Friction stir fabrication or other areas of interest. ### Previous Patent Application: Assembly for the interconnection of at least two components by means of an assembly and a receptacle element Next Patent Application: Hybrid resistance/ultrasonic welding system and method Industry Class: Metal fusion bonding ### FreshPatents.com Support Thank you for viewing the Friction stir fabrication patent info. IP-related news and info Results in 2.62578 seconds Other interesting Feshpatents.com categories: Canon USA , Celera Genomics , Cephalon, Inc. , Cingular Wireless , Clorox , Colgate-Palmolive , Corning , Cymer , |
||
