NDLI: Crystallization kinetics of bao-al2o3-sio2 glasses

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Crystallization kinetics of bao-al2o3-sio2 glasses

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bansal, Narottam P. Hyatt, Mark J.
Copyright Year	1988
Description	Barium aluminosilicate glasses are being investigated as matrix materials in high-temperature ceramic composites for structural applications. Kinetics of crystallization of two refractory glass compositions in the barium aluminosilicate system were studied by differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). From variable heating rate DTA, the crystallization activation energies for glass compositions (wt percent) 10BaO-38Al2O3-51SiO2-1MoO3 (glass A) and 39BaO-25Al2O3-35SiO2-1MoO3 (glass B) were determined to be 553 and 558 kJ/mol, respectively. On thermal treatment, the crystalline phases in glasses A and B were identified as mullite (3Al2O3-2SiO2) and hexacelsian (BaO-Al2O3-2SiO2), respectively. Hexacelsian is a high-temperature polymorph which is metastable below 1590 C. It undergoes structural transformation into the orthorhombic form at approximately 300 C accompanied by a large volume change which is undesirable for structural applications. A process needs to be developed where stable monoclinic celsian, rather than hexacelsian, precipitates out as the crystal phase in glass B.
File Size	2780679
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890010881
Archival Resource Key	ark:/13960/t1vf1qr83
Language	English
Publisher Date	1988-05-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Scanning Electron Microscopy Heat Treatment Morphology Crystallization Glass Reaction Kinetics Mechanical Properties Thermal Analysis Ceramics Electron Microscopy X Ray Diffraction Matrix Materials Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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