Fabrication of Novel Composites. Part I. Reactive Hot-Pressing of Gamma-Al2O3 with Synthetic Fluorine Micas.

Abstract

The feasibility of fabricating lamellar ceramic-based composites with controllable and easily modified properties by reactive hot-pressing of Gamma-Al2O3 with potassium and barium fluorine micas has been successfully demonstrated. The Ba-mica/Al2O3 composites close to full density (98%) were fabricated at moderate processing conditions which exhibit a 4-point bend strength of 45,000 psi and an elastic modulus of 50,000,000 psi. It has also been established that eutectic-like MgAl2O4 (spinel)/Al2O3 composites can also be fabricated 700 C below the eutectic temperature by this technique; mean Knoop (100) hardness values of 1500 have been measured on these composites. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1972
Accession Number
AD0742207

Entities

People

  • James W. McCauley

Organizations

  • United States Army Research Laboratory

Tags

DTIC Thesaurus Topics

  • Composite Materials
  • Fabrication
  • Fluorine
  • Hardness
  • Hot Pressing
  • Material Forming Processes
  • Materials Processing
  • Mechanical Properties
  • Mechanical Working
  • Modulus Of Elasticity
  • Potassium

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials
  • Rocket Propulsion.