Accession Number : ADA111692

Title :   Chem-Braze Abradable Seal Attachment to Aircraft Gas Turbine Compressor Components.

Descriptive Note : Final rept. 1 Nov 79-31 Sep 80,

Corporate Author : PRATT AND WHITNEY AIRCRAFT GROUP WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV

Personal Author(s) : Narsavage,Stephen T ; Safai,Saed ; Pettit,Harold W , Jr

PDF Url : ADA111692

Report Date : Jan 1982

Pagination or Media Count : 71

Abstract : Manufacturing methods were established for bonding an abradable seal surface onto the stationary compressor element (e.g., case shroud) of small gas turbine engines utilizing an easily replaceable Chem-Braze bond system. Continuing work initiated under Army contract DAAG46-78-C-0062, bonded specimens were prepared and evaluated in vibration and rub incursion tests. Tooling was fabricated for bonding a seal to Army supplied engine hardware, and NDI methods were established for inspecting bond integrity. Chemical stripping techniques for removing Chem-Braze attached seals were optimized to permit efficient refurbishment of severely worn seals. An economic analysis indicated significant cost savings for attaching abradable seals to compressor blade tip-shrouds using the improved Chem-Braze system compared to attachment with gold-nickel braze. The Chem-Braze system has been used successfully to bond abradable seals to titanium, cobalt, nickel and iron base alloys; however, attempts to use Chem-Braze to bond seals to selected aluminum and magnesium alloys were not successful. (Author)

Descriptors :   *Ceramic materials, *Bonding, *Abrasion, *Chemical cleaning, Sealing compounds, Compressors, Aircraft engines, Engine components, Gas turbines, Nondestructive testing, Alloys, Nickel alloys, Titanium alloys, Iron alloys, Cobalt alloys, Inspection, Economic analysis, Demonstrations, Tensile strength, Bonded joints, Seals(Stoppers)

Subject Categories : Ceramics, Refractories and Glass
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE