Microstructure of TiB/sub 2/ liquid phase sintered with Ni/sub 3/Al

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Proc. - Annu. Meet., Electron Microsc. Soc. Am.; (United States)

OSTI ID:6176310

Angelini, P; Bentley, J; Finch, C B; Sklad, P S

TiB/sub 2/ is a ceramic material which possesses exceptional thermal, chemical, and electrical properties. Commercial powders can be formed into bulk pieces by hot pressing at temperatures near 2000/sup 0/C. However, this produces excessive grain growth which can lead to cracking and low mechanical integrity due to the relatively large anisotropic thermal expansion of the TiB/sub 2/ grains. Liquid phase sintering can be used to produce structural forms of TiB/sub 2/ by hot pressing at temperatures near 1450/sup 0/C. This process limits the TiB/sub 2/ grain growth but introduces an intergranular phase. Previous work used Ni as a binder and under most hot-pressing conditions this resulted in the formation of a Ni/sub 3/B integranular phase. Additional binders are being considered to understand the phase development during liquid-phase sintering and to improve the properties of the bonded TiB/sub 2/ forms. The present research concerns the use of Ni/sub 3/Al as a binder for TiB/sub 2/.

• Research Organization: Oak Ridge National Lab., TN
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6176310
• Journal Information: Proc. - Annu. Meet., Electron Microsc. Soc. Am.; (United States), Journal Name: Proc. - Annu. Meet., Electron Microsc. Soc. Am.; (United States) Vol. 41; ISSN EMSPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
BORIDES
BORON COMPOUNDS
CRYSTAL STRUCTURE
FABRICATION
TITANIUM COMPOUNDS
TRANSITION ELEMENT C