Oxidation behavior of a pressureless sintered ZrB2–MoSi2 ceramic composite
Authors:
- 1 April 2005
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 20 (4) , 922-930
Abstract
Ultra-refractory ceramic composites of composition ZrB2 + (5 to 20) vol% MoSi2were produced by pressureless sintering at 1830 °C under argon atmosphere.Sintering cycles and microstructural analysis point out that at least 20 vol% molybdenum disilicide is necessary for obtaining a dense material. Thereafter, the composite 80 vol% ZrB2 + 20 vol% MoSi2 was used to test the thermal stabilityunder oxidizing environment. Oxidation tests were carried out in flowing syntheticair in a thermogravimetric analyzer from 700 to 1400 °C with exposure time of30 h. In the low-temperature range (700–1000 °C), the oxidation of the composite resembles that of monolithic ZrB2 ceramics, for temperatures >1200 °C the silica resulting from oxidation of molybdenum disilicide seals the sample surface, preventing zirconium diboride from fast degradation.Keywords
This publication has 23 references indexed in Scilit:
- Beneficial Effects of AlN as Sintering Aid on Microstructure and Mechanical Properties of Hot‐pressed ZrB2Advanced Engineering Materials, 2003
- Advances in microstructure and mechanical properties of zirconium diboride based ceramicsMaterials Science and Engineering: A, 2003
- Oxidation of ZrB[sub 2]-Based Ceramics in Dry AirJournal of the Electrochemical Society, 2003
- Processing and properties of zirconium diboride-based compositesJournal of the European Ceramic Society, 2002
- Zircon formation from amorphous silica and tetragonal zirconia: kinetic study and modellingSolid State Ionics, 2001
- Reactive Hot Pressing of ZrB 2 –SiC CompositesJournal of the American Ceramic Society, 2000
- Effect of third elements on the pesting suppression of Mo-Si-X intermetallics (X = Al, Ta, Ti, Zr and Y)Intermetallics, 1996
- Effects of Metallic Boride Dispersion on Fracture Toughness and Oxidation Resistance in SiC CeramicsJournal of the Ceramic Society of Japan, 1992
- Thermogravi metric Study of the Oxidation of ZrB[sub 2] in the Temperature Range of 800° to 1500°CJournal of the Electrochemical Society, 1971
- High-Temperature OxidationJournal of the Electrochemical Society, 1966