Accession Number:

AD0671550

Title:

TERNARY PHASE EQUILIBRIA IN TRANSITION METAL-BORON-CARBON-SILICON SYSTEMS. PART 1. BINARY SYSTEMS. VOLUME 13. THE ZIRCONIUM-SILICON AND HAFNIUM-SILICON SYSTEMS

Descriptive Note:

Documentary rept.

Corporate Author:

AEROJET-GENERAL CORP SACRAMENTO CA MATERIALS RESEARCH LAB

Personal Author(s):

Report Date:

1968-05-01

Pagination or Media Count:

73.0

Abstract:

The zirconium-silicon and hafnium-silicon binary systems were investigated by means of Debye-Scherrer X-ray analysis, metallography, melting points, differential analysis techniques, and chemical analysis. Both silicide systems contain a D88-type phase which is stabilized by trace impurities of oxygen and nitrogen. The binary phases present are Zr4Si, Zr2Si, Zr3Si2, Zr5Si4, alpha- and Beta-ZrSi, and ZrSi2 in the hafnium system Hf2Si, Hf3Si2, Hf5Si4, and HfSi2. The ZrSi phase undergoes an allotropic transformation at 1550C the high temperature form is of the CrB type while the low temperature crystal structure is of the FeB type. Complete phase diagrams from 1100C up to melting are given.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE