Reactivity of boron in soild state reaction and sintering for consolidation of boron compounds

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:518597

Itoh, Hideaki ^[1]

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1. Nagoya Univ. (Japan)

Boron compounds such as TiB{sub 2}, B{sub 4}C, B{sub 6}O and cBN are known as super-hard ceramic materials and are used for cutting tools and wear-resistant dies or nozzles. However, these materials are difficult to sinter under normal pressure in the absence of sintering reagents. To achieve full density, fine-grained powders of these boron compounds must be sintered under high pressure and temperature conditions. The use of composite powder consisting of these boron compounds is effective for controlling the microstructure and increasing the toughness of the ceramics. In the present paper, the reactivity of amorphous boron is examined during solid phase synthesis of boron compounds. High pressure sintering behavior of TiB{sub 2}-B{sub 4}C, B{sub 6}O-B{sub 4}C or cBN is also investigated in relation to the sinterability of the synthesized powder, the microstructural control of sintered compact, and improvement of mechanical properties. The role of reactive boron in the formation of boron compounds and mass transport in the sintering process for improved consolidation of boron compounds is discussed.

• OSTI ID: 518597
• Report Number(s): CONF-960367--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON CARBIDES
BORON NITRIDES
BORON OXIDES
MASS TRANSFER
MECHANICAL PROPERTIES
MICROSTRUCTURE
SINTERING
SYNTHESIS
TITANIUM BORIDES