Electrical and mechanical properties of ZrO{sub 2} (2 mol% Y{sub 2}O{sub 3})/MoSi{sub 2} composites and their laminated materials

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(96)00013-X· OSTI ID:230711

Muraoka, Yoshiyuki; Yoshikawa, Fumihito; Hirota, Ken; Yamaguchi, Osamu ^[1]; Asai, Junji; Makiyama, Yukio ^[2]

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1. Doshisha Univ., Tanabe, Kyoto (Japan). Dept. of Molecular Science and Technology
2. Taiyo Koko Co. Ltd., Hyogo, Ako (Japan)

Well-densified composites with the compositions ZrO{sub 2} (2Y)/MoSi{sub 2} = 60/40 and 80/20 mol% have been fabricated by hot isostatic pressing for 2 h at 1,400 C and 196 MPa. Electric resistivities ({rho}) of the two composites are very different; the former and latter composites correspond to metallic and insulating materials, respectively. The properties are strongly dependent on the textures. Laminated materials with the compositions ZrO{sub 2} (2Y)/MoSi{sub 2} = (60/40)/(80/20)/(60/40) mol% have been prepared by the same technique. Overall electric resistivities in directions perpendicular and parallel to the interfaces have been determined to be {rho}{sub {perpendicular}} {approx} 1 {times} 10{sup 11} {Omega} {center_dot} cm and {rho}{sub {parallel}} {approx} 1 {times} 10{sup {minus}4} {Omega} {center_dot} cm, respectively. Residual stress as much as {approx} 150 MPa is induced in the interfaces. The fracture toughness (K{sub Ic}) is greatly affected by the residual stress.

• OSTI ID: 230711
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 31; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
ELECTRIC CONDUCTIVITY
FRACTURE PROPERTIES
HOT PRESSING
INTERFACES
INTERMETALLIC COMPOUNDS
LAYERS
MOLYBDENUM SILICIDES
RESIDUAL STRESSES
SCANNING ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM OXIDES
ZIRCONIUM OXIDES