COMPOSITE METAL STRUCTURE USEFUL IN SOUND ABSORPTION

• US 3,693,750 A
• Filed: 09/21/1970
• Issued: 09/26/1972
• Est. Priority Date: 09/21/1970
• Status: Expired due to Term

• Current Assignee: Philip D. Takkunen
• Original Assignee: Philip D. Takkunen
• Inventors: Takkunen, Philip D.
• Primary Examiner(s): Ward, Jr., Robert S.
• Application Number:
  US05/073,890
• Time in Patent Office: 736 Days
• Field of Search: 181/33G,33GA,42,50,36A,71,33HB 29/182,182.1,182.2,182.3,182.5,182.7,182.8 210/496,510
• US Class Current: 428/558
• CPC Class Codes: B32B 15/043 of metal B32B15/01 takes precedence
• CPC Class Codes: B32B 2305/02 Cellular or porous
• CPC Class Codes: B32B 2305/024 Honeycomb
• CPC Class Codes: B32B 2307/102 Insulating
• CPC Class Codes: B32B 3/12 characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
• CPC Class Codes: E04B 1/86 slab-shaped
• CPC Class Codes: E04B 2001/748 Honeycomb materials
• CPC Class Codes: E04C 2/365 by honeycomb structures
• CPC Class Codes: Y10T 428/12028 Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
• CPC Class Codes: Y10T 428/12076 Next to each other
• CPC Class Codes: Y10T 428/12097 Nonparticulate component encloses particles
• CPC Class Codes: Y10T 428/24149 Honeycomb-like

Abstract

A composite metal structure, useful in sound absorption applications, comprising a metal part having perforations or recesses containing sintered porous powdered metal is made by pressing said metal part with a mixture of powdered metal and heat-fugitive binder to force said mixture into said perforations or recesses, and then heating the assembly to volatilize the burn-off said binder and sinter said powdered metal, the powdered metal in the resulting structure being held in said perforations or recesses by a metallurgically integral bond as well as mechanical bond.

Claims

2. The panel of claim 1, wherein said part is a sheet of wrought, cast, or sintered powdered metal.

3. The panel of claim 2 wherein said bodies of sintered powdered metal are integral with a sheet of porous sintered powdered metal metallurgically integral by a sinter bond between the two sheets.

4. The panel of claim 2 wherein said metal part is a wrought sheet of stainless steel.

5. The panel of claim 2 wherein said powdered metal is powdered stainless steel.

6. A metal acoustical panel comprising a solid metal base sheet, a perforated metal sheet, a metal honeycomb structure interposed between and bonded to said sheets, a face sheet of sintered powdered metal sinter bonded to the top of said perforated metal sheet, and porous bodies of sintered powder metal in the range of -20 to +325 mesh integral with said face sheet and depending within said perforations of said perforated sheet, said bodies being metallurgically integral with the walls defining said perforations.

7. The article of claim 1 wherein said sheet and bodies are made of stainless steel.