초록 ▼

Method of manufacturing broad band attenuation panel structure and the resulting structure therefrom for utilization in high temperature applications, having a maximum temperature in the range of 1600°F. The panel comprises a cellular core constructed of Inconel, titanium alloys, 321 stainless steel

Method of manufacturing broad band attenuation panel structure and the resulting structure therefrom for utilization in high temperature applications, having a maximum temperature in the range of 1600°F. The panel comprises a cellular core constructed of Inconel, titanium alloys, 321 stainless steel, P H hardened stainless steel and the like, positioned between and brazed, liquid interface diffusion (LID) bonded, or diffusion bonded to two facing sheets, one imperforate and one perforated, the facing sheets constructed of a similar material. A sheet of porous metal overlay made of Inconel, nickel, monel, stainless steel alloys or the like is diffusion bonded to the outer surface of the perforated facing sheet. The sequential steps of sizing, cleaning, plating, and heating are set forth as well as the details of pressure, temperature, and protective atmosphere, and protective materials.

대표청구항 ▼

A method for manufacturing a honeycomb noise attenuation structure for a high temperature application, the structural components of said structure comprise a central honeycomb cellular core sandwiched between an imperforate and a perforate sheet with the outer surface of the perforated sheet having

A method for manufacturing a honeycomb noise attenuation structure for a high temperature application, the structural components of said structure comprise a central honeycomb cellular core sandwiched between an imperforate and a perforate sheet with the outer surface of the perforated sheet having an overlay comprising a single layer of a porous metal, said method comprising the steps of: (a) sizing the structural components; (b) cleaning the structural components; (c) diffusion bonding the single layer of porous metal to one surface of the perforated sheet; (d) wetting only the central core cell walls with a binder; (e) applying a selected amount of a powdered braze alloy evenly over the binder coated surfaces the core edges being left free from said powdered braze alloy; (f) stacking the imperforate sheet, honeycomb cellular core and combined perforate sheet and single layer of porous metal in assembly order; (g) placing the stacked structural components in a vacuum furnace; (h) applying a positive pressure to the stacked structural components; (i) evacuating the vacuum furnace; (j) elevating the internal temperature of the evacuated furnace to a level causing the braze alloy to melt and flow; and (k) returning the stacked components to ambient temperature.