Toughness of dense MoSi sub 2 and MoSi sub 2 /tantalum composites produced by low pressure plasma deposition

Journal Article · Tue Jan 14 23:00:00 EST 1992 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90174-D· OSTI ID:7040762

Castro, R G; Rollett, A D; Stanek, P W ^[1]; Smith, R W ^[2]

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1. Material Science and Technology Div., Los Alamos National Lab., Los Alamos, NM (US)
2. Materials Engineering Dept., Drexel Univ., Philadelphia, PA (US)

The thrust to develop new high temperature materials for advanced aircraft turbine engines has focused on composite systems based on metal-matrix, ceramic-matrix, intermetallic matrix and carbon-carbon composites. For the case of intermetallic matrix composites, candidate materials such as aluminides and silicides have been identified as potential materials due to their excellent oxidation resistance at high temperatures. More specific to the class of silicides, is molybdenum disilicide (NoSi{sub 2}), which has been used as a high melting intermetallic (2030 {degrees} C) for more than eighty years. One of the properties which has discouraged the application of MoSi{sub 2}, as well as other intermetallic compounds, is the inherent lack of ductility at low to intermediate temperatures. Plasma spraying as a means of fabricating composite structures of metals has been addressed recently by a number of researchers. In this paper the use of low pressure plasma deposition (LPPD) for producing spray deposits of MoSi{sub 2} and MoSi{sub 2} with a 20 volume fraction of tantalum is investigated. Initial results focusing on the as-deposited densities and fracture toughness of the spray deposited material are compared to those properties measured on conventionally hot pressed MoSi{sub 2}. Effects of post consolidation on fracture toughness of the spray deposits are also addressed.

• OSTI ID: 7040762
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 26:2; ISSN SCRME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
CORROSION RESISTANCE
DEPOSITION
DUCTILITY
ENGINES
FATIGUE
GAS TURBINE ENGINES
HARDENING
HEAT ENGINES
HEAT RESISTANT MATERIALS
INTERMETALLIC COMPOUNDS
INTERNAL COMBUSTION ENGINES
LOW PRESSURE
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
PHASE STUDIES
PHYSICAL PROPERTIES
PLASMA
PLASMA ARC SPRAYING
REFRACTORY METAL COMPOUNDS
RESEARCH PROGRAMS
SILICIDES
SILICON COMPOUNDS
SOLID-STATE PLASMA
SPRAY COATING
STRAIN HARDENING
SURFACE COATING
TANTALUM COMPOUNDS
TENSILE PROPERTIES
TESTING
THERMAL FATIGUE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS