| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
2024 Graduate Student Poster Contest
|
| Presentation Title |
SPG-21: Effect of TiO2 and AlN Addition on the Mesoscale Mechanical Properties of Si3N4 Ceramics |
| Author(s) |
Takahiro Saito, Junichi Tatami, Motoyuki Iijima, Tatsuki Ohji, Tsukaho Yahagi, Takuma Takahashi, Hiromi Nakano |
| On-Site Speaker (Planned) |
Takahiro Saito |
| Abstract Scope |
TiN particle dispersed Si3N4 ceramics fabricated by adding TiO2 and AlN as sintering aids have been applied to bearing because they exhibit excellent fatigue and wear resistance. Although these properties have been considered to result from grain boundary strengthening, there have been no researches on the actual measurements of the mechanical properties of grain boundaries at mesoscale. In this study, the effect of TiO2 and AlN addition on the mesoscale mechanical properties such as grain boundary strength and fracture toughness of TiN particle dispersed Si3N4 ceramics was investigated by bending test using microcantilever beam specimens. The addition of TiO2 and AlN increased the grain boundary strength and fracture toughness of Si3N4 ceramics by 3.0 GPa and 0.54 MPam1/2, respectively, over those without both addition. Such grain boundary strengthening may result in steep increase in the R-curve with a slight increase in crack propagation, thus causing superior fatigue and wear properties. |