MoSi2 MATRIX COMPOSITES FOR COMBUSTION COMPONENTS, REPORT 2018:495

Rapport, 2018

MoSi2 based material is the soundest heating element material owing to its high melting point, excellent oxidation resistance, high thermal conductivityand 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.

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 as-manufactured 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.