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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Double Reinforcements on Elevated-Temperature Strength and Toughness of Molybdenum Disilicide (2004)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 87 (2004), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Flexural strength and fracture toughness of molybdenum disilicide and its composites with 10 wt% TiB2 and 10 wt% TiB2+ 10 wt% SiC, synthesized by the hot-pressing technique, were evaluated as a function of temperature, ranging from ambient temperature to 1600°C. Results show that the composites have higher strength and slightly lower toughness as compared with monolithic MoSi2 at room temperature. At high temperatures, the composites exhibit higher strength as well as higher toughness vis-à-vis monolithic MoSi2. Among the composites, the double reinforcement of SiC and TiB2 was found to be more effective in improving the mechanical properties. A transition from brittle to ductile behavior was observed at temperatures greater than 1300°C for all materials tested. The high-temperature mechanical behavior was found to be significantly influenced by the flow of an intergranular glassy phase and the attendant cavity nucleation and growth along the grain boundaries. Micromechanisms responsible for the ambient as well as the elevated-temperature property improvement in composites are discussed with the aid of fractography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.00626.x
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement under pressure of thermoelectric power along the thickness of a thin specimen (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1372-1373 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method of measuring under pressure the thermoelectric power along the thickness of thin specimens is described. This method is useful in measuring thermoelectric power in a direction perpendicular to the cleavage plane of a crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142504
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  • 3
    Electronic Resource
    Electronic Resource
    Reactive Infiltration of Aluminum into Molybdenum Disilicide Preform (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Aluminum has been reactively infiltrated into a molybdenum disilicide preform with relative densities of 40% and 85%. The resultant compact is found to contain Mo(Al,Si)2 particles surrounded by aluminum metal; 14 to 18 at.% of aluminum reacted with MoSi2 irrespective of the infiltration temperature and time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02399.x
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  • 4
    Electronic Resource
    Electronic Resource
    Aluminum Infiltration into Molybdenum Silicide Preforms (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The presence of Mo5Si3 in MoSi2 preforms hinders the reactive infiltration of aluminum. To understand the role of Mo5Si3, the kinetics of aluminum infiltration into pure Mo5Si3 is studied. Irrespective of the initial composition (MoSi2 or Mo5Si3) of the preform, the final product always contains Mo(Al,Si)2. However, the aluminum content in the two cases is different: when the preform is MoSi2, the aluminum content is 14–18 at.%, and, when the preform is Mo5Si3, the aluminum content is 25–27 at.%. The activation energy for the reactive infiltration of aluminum into the Mo5Si3 preform is ∼26 kJ/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00461.x
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of densification and TiB2 reinforcement on the wear of molybdenum disilicide (2000)
    Springer
    Tribology letters 8 (2000), S. 219-222 
    Details
    ISSN: 1573-2711
    Keywords: wear ; molybdenum disilicide ; densification ; reinforcement ; hardness ; fracture toughness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Wear tests were done in a pin‐on‐disc machine by sliding MoSi2 pins against hard‐steel discs in a normal load range of 5–140 N and a speed of 0.5 m/s under nominally dry conditions in the ambient. The specific wear rate of the pin undergoes two transitions: severe to mild at low load and mild to severe at high load. The mild‐wear domain is distinguished by the formation of a protective mechanically mixed layer of steel and its oxides, transferred from the counterface in particulate form. Increasing the hardness by densification and TiB2 reinforcement lowers the specific wear rate and expands the mild‐wear load domain. However, even when the volume wear rate is normalised with respect to the real contact area (load/hardness) the non‐dimensional wear factor is still seen to decrease with densification and reinforcement. This indicates that fracture toughness may also play an important role in determining the wear‐resistance of these materials. The surface coverage on the pin by the mechanically mixed layer increases with densification and reinforcement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019112007689
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