Abstract
The mechanical behavior of ZrB 2 -MoSi 2 ceramics made of ZrB 2 powder with three different particle sizes and MoSi 2 additions from 5 to 70 vol% was characterized up to 1500 °C. Microhardness (12-17 GPa), Young's modulus (450-540 GPa) and shear modulus (190-240 GPa) decreased with both increasing MoSi 2 content and with decreasing ZrB 2 grain size. Room temperature fracture toughness was unaffected by grain size or silicide content, whilst at 1500 °C in air it increased with MoSi 2 and ZrB 2 grain size, from 4.1 to 8.7 MPa m 1/2 . Room temperature strength did not trend with MoSi 2 content, but increased with decreasing ZrB 2 grain size from 440 to 590 MPa for the largest starting particle size to 700-800 MPa for the finest due to the decreasing size of surface grain pullout. At 1500 °C, flexure strength for ZrB 2 with MoSi 2 contents above 25 vol% were roughly constant, 400-450 MPa, whilst for lower content strength was controlled by oxidation damages. Strength for compositions made using fine and medium ZrB 2 powders increased with increasing MoSi 2 content, 250-450 MPa. Ceramics made with coarse ZrB 2 displayed the highest strengths, which decreased with increasing MoSi 2 content from 600 to 450 MPa.
| Original language | American English |
|---|---|
| Pages (from-to) | 1948-1954 |
| Number of pages | 7 |
| Journal | Journal of the European Ceramic Society |
| Volume | 39 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 1 2019 |
Keywords
- High temperature
- Mechanical properties
- Molybdenum disilicide
- Particle size
- Zirconium diboride
Disciplines
- Ceramic Materials
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