| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
13th Symposium on Green and Sustainable Technologies for Materials Manufacturing and Processing
|
| Presentation Title |
Room-temperature Densification of MgO Ceramics with Nitride Phosphor Particles |
| Author(s) |
Junichi Tatami, Emi Takahashi, Takuma Takahashi |
| On-Site Speaker (Planned) |
Junichi Tatami |
| Abstract Scope |
Wave conversion materials with high thermal conductivity are required for high-power semiconductor lighting. Ceramics have higher thermal conductivity than existing matrices such as resin or glass in which phosphor particles are dispersed. However, the high densification of ceramics generally requires high-temperature sintering, which degrades and alters the phosphor particles. In this study, we aimed to achieve the high densification of MgO ceramics at room temperature. Applying high hydrostatic pressure with water addition improved the sample packing ratio and promoted the formation of Mg(OH)2. As a result, the relative density was ≥95%. Additionally, various nitride phosphor particles (CaAlSiN3:Eu2+, β-SiAlON:Eu2+, and α-SiAlON:Eu2+) were dispersed in the MgO matrix at room temperature without degrading the luminescence property. The thermal conductivity of the obtained sample was about 8 W m−1K−1, 40 times higher than that of the epoxy matrix. |