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Microstructural and mechanical properties of cBN-Si composites prepared from the high pressure infiltration method.
- Source :
-
International Journal of Refractory Metals & Hard Materials . Dec2016, Vol. 61, p1-5. 5p. - Publication Year :
- 2016
-
Abstract
- The grain size dependence of the mechanical properties of cBN-Si composites prepared using the high pressure infiltration method has been investigated. Indentation testing indicates that cBN-Si composites have hardness values of 38–43 GPa, which increase with increasing grain size and are harder than traditional polycrystalline cBN composites (PcBNs). Thermostability analyses display that cBN-Si composites with a grain size of > 9 μm also possess a higher temperature of oxidation, compared to traditional PcBNs, and the thermostability increases with increasing cBN grain size. Fracture toughness tests show that almost no cracks appear on the polished cBN-Si samples when the loading forces are increased to 294 N and the fracture toughness is better than for commercial samples. Scanning electron microscopy illustrates that deformations and close pores occurred easily between coarse BN grains, leading to denser cBN-Si compacts with better mechanical performances. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02634368
- Volume :
- 61
- Database :
- Academic Search Index
- Journal :
- International Journal of Refractory Metals & Hard Materials
- Publication Type :
- Academic Journal
- Accession number :
- 119161440
- Full Text :
- https://doi.org/10.1016/j.ijrmhm.2016.07.020