Characterization of Mo-SiO{sub 2} functionally graded materials

Journal Article · Sat Jan 01 04:00:00 UTC 2000 · Metallurgical and Materials Transactions A

DOI:https://doi.org/10.1007/s11661-000-0074-6· OSTI ID:771918

Ishibashi, H ^[1]; Tobimatsu, T; Matsumoto, T; Hayashi, K; Tomsia, A P; Saiz, E

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1. LBNL Library

Mo/SiO{sub 2} functionally graded materials (FGMs) have been prepared by combined slip casting and sedimentation techniques. The final, sintered samples have a gradient in molybdenum content with a maximum value of {approximately}20-25 vol% Mo. At one edge, the FGM is a good electrical conductor (for approximately one third of the total length), while the opposite end is composed mainly of fused SiO2. The variation of electrical resistivity, hardness, toughness and thermal expansion along the gradient has been analyzed. FGMs sintered in vacuum contained a small amount of Mo oxide ({approximately}2 wt%) as a third phase. The oxide originated from the starting Mo powders and oxidation during presintering. The oxide was in the form of discrete particles and did not appreciably affect the measured properties. Mo content had the expected effect on the FGM properties-an increase in Mo increases resistivity, thermal expansion, and toughness.

• Research Organization: Lawrence Berkeley National Lab., CA (US)
• Sponsoring Organization: Industry (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 771918
• Report Number(s): LBNL--46552
• Journal Information: Metallurgical and Materials Transactions A, Journal Name: Metallurgical and Materials Transactions A Journal Issue: 1 Vol. 31
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRIC CONDUCTIVITY
HARDNESS
MOLYBDENUM
MOLYBDENUM SILICA GRADED MATERIALS HIGH PRESSURE LAMPS MICROSTRUCTURE ELECTRICAL PROPERTIES MECHANICAL PROPERTIES
OXIDATION
SEDIMENTATION
SILICON OXIDES
SLIP CASTING
THERMAL EXPANSION