MgSiN2 Addition as a Means of Increasing the Thermal Conductivity of β-Silicon Nitride |
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| Authors: | Hiroyuki Hayashi Kiyoshi Hirao Motohiro Toriyama Shuzo Kanzaki Kiyoshi Itatani |
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| Affiliation: | Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology, Nagoya, Aichi 463-8687, Japan;Department of Chemistry, Faculty of Science and Engineering, Sophia University, Tokyo 102-8554, Japan |
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| Abstract: | Si3N4 powders with the concurrent addition of Yb2O3 and MgSiN2 were sintered at 1900°C for 2–48 h under 0.9 MPa nitrogen pressure. Microstructure, lattice oxygen content, and thermal conductivity of the sintered specimens were evaluated and compared with Si3N4, Yb2O3, and MgO addition. MgSiN2 addition was effective for improving the thermal conductivity of Si3N4 ceramics, and a material with high thermal conductivity over 140 W·(m·K)?1 could be obtained. For both specimens, lattice oxygen content was decreased with sintering time. However, the thermal conductivity of the MgSiN2-doped specimen was slightly higher than the MgO-doped specimen with the same oxygen content. |
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| Keywords: | silicon nitride thermal conductivity magnesium oxide sinter/sintering |
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