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  • Report
  • Heating and Cooling

MoSi2 Matrix Composites for Combustion Components

| 2018:495 | Yiming Yao, Erik Ström
MoSi2 based material is the soundest heating element material owing to its high melting point, excellent oxidation resistance, high thermal conductivity and thermal stability. Applying MoSi2 matrix composites for hot corrosion components can potentially increase the efficiency of a gas turbine by increasing operation temperature by 100–200˚C.
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The oxidation resistance of MoSi2+15vol%ZrO2 composite after final sintering
was comparable to KS1700 material in cyclic exposure at 1200 – 1300˚C and
isothermal exposure at 1400˚C; the creeping resistance was close to the state
of KS HT material in sag testing at 1600˚C; the flexure strength retained 427
MPa at 1200C. The oxidation property of as-PLS sintered MoSi2+10vol%SiC
composite at 1400˚C was comparable to that of KS1700 and FS MoSi2-ZrO2
composite; the creeping resistance at 1600˚C was comparable to that of Kanthal
HT material and superior to MoSi2+ZrO2 composite.


Single Edge V- Notch Beam toughness measurement technique was developed for cylindrical shaped-beam. The technique can be directly applied to asmanufactured testing pieces without machining. High accuracy of KIC data
were obtained compared with the references of National Physics laboratory,
UK. The innovation provided reliable KIC measurement for R&D of ceramics/
intermetallics materials.