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Pressureless Sintering of MoSi2 Materials

Published online by Cambridge University Press:  22 February 2011

Roland Scholl,
Thomas JÜngling and
Bernd Kieback
Roland Scholl
Affiliation:
Fraunhofer Institute for Applied Materials Research, Department for Powder Metallurgy and Composite Materials, Helmholtzstrasse 20, 01069 Dresden, PF 16, Germany
Thomas JÜngling
Affiliation:
Fraunhofer Institute for Applied Materials Research, Department for Powder Metallurgy and Composite Materials, Helmholtzstrasse 20, 01069 Dresden, PF 16, Germany
Bernd Kieback
Affiliation:
Fraunhofer Institute for Applied Materials Research, Department for Powder Metallurgy and Composite Materials, Helmholtzstrasse 20, 01069 Dresden, PF 16, GermanyDresden Technical University, Institute for Materials Science, Helmholtzstrasse 7, 01069 Dresden, Germany
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Abstract

Various powder mixtures were prepared by a modified mechanical alloying technique. Starting from elemental Mo-, Si- and C-powders the influence of milling conditions on phase formation during the milling process and the subsequent heat treatment was investigated. Phase formation during sintering and sintering kinetics of activated starting mixtures were studied by differential scanning calorimetry (DSC), thermal graphimetry (TG), X-ray diffraction (XRD) and dilatometry. The results show that phase formation during milling or sintering strongly depends on milling conditions. Optimized powder mixtures of single phase and reinforced molybdenum silicides show high densities up to 98,5 % TD by pressureless sintering in various atmospheres. Full density is possible by post-HIP because the samples show only closed porosity. The microstructure was studied in dependence of sintering parameters. The level of impurities, i.e. C, O2 was determined. Hardness, fracture toughness and bending strength were measured for single phase and particle reinforced materials.

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