Liquid-phase-sintering phenomena of non-oxide silicon compounds. Technical progress report, 1 July 1979-29 February 1980
The noncrystalline intergranular phase in three hot-pressed silicon nitride alloys containing MgO has been found to have a composition close to the SiO/sub 2/-Mg/sub 2/SiO/sub 3/ tie line. This finding of a composition removed from the ternary eutectic in the Si/sub 3/N/sub 4/-Si/sub 2/N/sub 2/O-Mg/sub 2/SiO/sub 4/ phase field suggests that phase equilibrium during hot-pressing is not totally attained despite the x-ray diffraction evidence that the bulk of the materials has reached equilibrium. The exact composition of the noncrystalline phase varies from one location to another in the microstructure and incorporates impurities including Ca, Al, and Cl. These impurities will unquestionably affect the high temperature properties of the intergranular phase.
- Research Organization:
- Rockwell International Corp., Thousand Oaks, CA (USA). Science Center
- DOE Contract Number:
- AC03-78ER01885
- OSTI ID:
- 6557577
- Report Number(s):
- DOE/ER/01885-T1
- Country of Publication:
- United States
- Language:
- English
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