Development of Fiber Reinforced Ceramic Matrix Composites.

Abstract

Hot-pressed silicon nitride (Si3N4) is a leading candidate for use in advanced gas turbine engines. Using an improved matrix material of Si3N4 + 10 wt % Y2O3, Ta reinforced Si3N4 composites have shown excellent thermal fatigue and thermal shock properties in addition to much improved impact resistance when compared to unreinforced Si3N4. Ballistic impact tests at 1300C have shown that the threshold energy below which no damage occurs upon impact for Si3N4-Ta composites is on the order of five times greater than for unreinforced Si3N4. Creep tests at 1300C, 15,000 psi, have shown the Ta reinforced Si3N4 + 10% Y2O3 sample performing as well, or even better than, the unreinforced sample. In addition, component vane and wedge shapes of dense Si3N4 and Si3N4 reinforced with Ta wires have been formed with minimal finish grinding using the 'pseudo-isostatic' hot-pressing technique.

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1975
Accession Number
ADA009360

Entities

People

  • John J. Brennan

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Creep Tests
  • Gas Turbines
  • Hot Pressing
  • Impact Tests
  • Materials
  • Materials Processing
  • Mechanical Properties
  • Thermal Fatigue
  • Thermal Shock
  • Turbine Components
  • Turbines

Fields of Study

  • Materials science

Readers

  • Game Theory.
  • Reinforced Composite Materials
  • Surface Engineering/Surface Coating Technology.