Effects of Al
2
O
3
–Y
2
O
3
/Yb
2
O
3
additives on microstructures and mechanical properties of silicon nitride ceramics prepared by hot‐pressing sintering
Abstract:Silicon nitride (Si 3 N 4 ) ceramics doped with two different sintering additive systems (Al 2 O 3 -Y 2 O 3 and Al 2 O 3 -Yb 2 O 3 ) were prepared by hot-pressing sintering at 1800°C for 2 h and 30 MPa. The microstructures, nano-indentation test, and mechanical properties of the as-prepared Si 3 N 4 ceramics were systematically investigated. The X-ray diffraction analyses of the as-prepared Si 3 N 4 ceramics doped with the two sintering additives showed a large number of phase transformations of α-Si 3 N 4 to … Show more
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