Accession Number : ADA116652

Title :   Influence of Composition and Process Selection on Densification of Silicon Nitride.

Descriptive Note : Final rept.,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA

Personal Author(s) : Gazza,George E

PDF Url : ADA116652

Report Date : May 1982

Pagination or Media Count : 19

Abstract : In the development of fully dense silicon nitride, both compositional selection and microstructural control are taken into consideration to maximize resultant properties. The effect of impurities and phase behavior on high temperature properties depends on the silicon nitride-additive compositional selection. Both strength and fracture toughness within a given compositional system can be improved by process control of the microstructure, i.e., grain size and morphology. Dual pressure processing of silicon nitride-yttria-alumina materials can be used to sinter these materials to near theoretical density. (Author)

Descriptors :   *Silicon nitrides, *Hot pressing, *Sintering, *Chemical composition, Density, Fracture(Mechanics), Toughness, Magnesium compounds, High temperature, Formulations(Chemistry), Strength(Mechanics), Sizes(Dimensions), Morphology, Pressure, Yttrium, Aluminum, Processing, Theory

Subject Categories : Industrial Chemistry and Chemical Processing
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE