Chem-Braze Abradable Seal Attachment

Abstract

An improved Chem-Braze bonding system for attaching sintered abradable seals to compressor blade tip-shrouds was developed. The improved Chem-Braze system incorporates glycerin as an inhibitor to prevent premature evaporation which prolongs working life and allows adequate time to attach seals to engine hardware. Manufacturing guidelines including glycerin concentration, working environment, slurry thickness, bonding pressure, drying and curing parameters, and refurbishing techniques were established. Tooling techniques for attaching abradable seals to engine hardware using this improved system were selected based on a feasibility demonstration which incorporated simulated engine hardware. Nondestructive inspection (NDI) techniques for verifying bond integrity were investigated, but a satisfactory technique was not identified. A preliminary 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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 01, 1980
Accession Number
ADA086872

Entities

People

  • Charles C. Mccomas
  • Hal W. Pettit Jr.
  • Steve T. Narsavage

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Alkenes
  • Chemistry
  • Economic Analysis
  • Gas Turbines
  • Heat Treatment
  • Manufacturing
  • Materials
  • Materials Engineering
  • Materials Testing
  • Mechanical Properties
  • Mechanics
  • Nickel Aluminide
  • Remotely Piloted Vehicles
  • Test And Evaluation
  • Test Methods
  • Turbines

Readers

  • Aerodynamics.
  • Software Engineering
  • Surface Coatings Technology.