Synthesis of molybdenum disilicide by mechanical alloying

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:6224690

Schwarz, R B; Srinivasan, S R; Petrovic, J J; Maggiore, C J

We have used mechanical alloying (MA), a high-energy ball-milling process, to prepare MoSi{sub 2} and MoSi{sub 2}-based alloys starting from mixtures of the pure elements. This synthesis route has the potential for preparing oxygen-free MoSi{sub 2} and the flexibility for close control of second-phase additions. MA, first developed for producing oxide-dispersions in Ni-based superalloys, takes advantage of the atomic-level mixing accomplished by the intense mechanical working of the alloy constituents. All the alloying reactions during the process occur in the solid-state. This technique is thus well-suited for synthesizing high melting point materials such as MoSi{sub 2}. The product of the MA process is a highly homogeneous and fine-grained powder. Its purity is determined by the purity of the starting materials and possible impurities introduced during processing. However, a careful control of the MA process enables a minimization of the impurities. We also report here the consolidation of the mechanically alloyed powder and the characterization of the MoSi{sub 2} alloys by optical and transmission electron microscopy, x-ray diffraction, and mechanical property measurements. 21 refs., 9 figs.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6224690
• Report Number(s): LA-UR-91-3605; CONF-9111115-2; ON: DE92003852
• Resource Relation: Conference: High temperature structural silicides workshop, Gaithersburg, MD (United States), 4-6 Nov 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MOLYBDENUM SILICIDES
SYNTHESIS
ELECTRON MICROSCOPY
HARDNESS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MORPHOLOGY
X-RAY DIFFRACTION
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
MICROSCOPY
MOLYBDENUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SILICIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties