Thermal properties of polycrystalline cubic boron nitride sintered under high pressure condition
The excellent thermal and chemical properties of cubic boron nitride (cBN) indicate that it is potential materials to prepare the thermal dissipate substrate applied in the electronic packaging. The thermal properties of polycrystalline cBN ceramics, however, have not been fully investigate...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
International Institute for the Science of Sintering, Beograd
2018-01-01
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| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2018/0350-820X1804401L.pdf |
| Summary: | The excellent thermal and chemical properties of cubic boron nitride (cBN)
indicate that it is potential materials to prepare the thermal dissipate
substrate applied in the electronic packaging. The thermal properties of
polycrystalline cBN ceramics, however, have not been fully investigated. We
report the first sintering experiment on preparing polycrystalline cBN
ceramics using cBN powder as starting material without any sintering aids.
The microstructure and high bending strength show that the strong
combination was achieved among the crystal grains. The measured results,
including density, thermal conductivity and thermal expansion coefficient,
reveal that the properties of this ceramics depend on the grain size of
starting crystal cBN. The PcBN ceramics has low thermal expansion
coefficient extremely matching to that of silicon and exhibits moderate
thermal conductivity due to its low density and the existence of low thermal
conductive phase of hexagonal boron nitride. |
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| ISSN: | 0350-820X 1820-7413 |