Creep behavior of plasma-sprayed SiC-reinforced MoSi[sub 2]

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90263-R· OSTI ID:6397208

Jeng, Y L; Lavernia, E J; Wolfenstine, J ^[1]; Bailey, D E; Sickinger, A ^[2]

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1. Univ. of California, Irvine (United States)
2. Electro-Plasma, Inc., Irvine, CA (United States)

In a previous paper, the authors presented some preliminary results on the synthesis, room temperature fracture toughness and creep resistance of a SiC ([approximately]9 vol.%) - reinforced MoSi[sub 2] composite processed by a low pressure plasma deposition technique. The results of the constant stress tests as a function of temperature suggested a change in the rate-controlling creep mechanism at 1300[degree]C from one with a high activation energy at temperatures lower than 1300[degree]C to one with a low activation energy at temperatures higher than 1300[degree]C. The creep mechanism in the low activation energy region was attributed to be grain boundary sliding, which is assisted by the presence of an amorphous silica grain boundary phase which melts or softens at a temperature of approximately 1300[degree]C. It is the purpose of this paper to confirm the suggestion that a change in the rate-controlling creep mechanism as a function of temperature occurs in the plasma-sprayed SiC-reinforced MoSi[sub 2]. The stress exponent(n), activation energy (Q) for creep, and microstructure as a function of temperature were investigated. In addition, the effect of orientation on the creep behavior (with respect to the spray direction).

• OSTI ID: 6397208
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:1; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CREEP
CRYSTAL STRUCTURE
DATA
DEPOSITION
EXPERIMENTAL DATA
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NUMERICAL DATA
PLASMA ARC SPRAYING
SILICON ALLOYS
SILICON CARBIDES
SILICON COMPOUNDS
SPRAY COATING
SURFACE COATING
TEMPERATURE DEPENDENCE