采用 Ｄｙ、 Ｓｍ 和（ Ｄｙ＋ Ｓｍ） 作为α-Ｓｉａｌｏｎ 的生成剂， 比较了这三类α-β-Ｓｉａｌｏｎ 陶瓷的相组成的控制、力学性能和显微结构结果表明： 含复合稀土（ Ｄｙ ＋ Ｓｍ） 的α-β-Ｓｉａｌｏｎ 陶瓷比使用单一稀土的 Ｓｉａｌｏｎ 陶瓷具有更大的优越性与 Ｓｍ-Ｓｉａｌｏｎ 不一样， 在（ Ｄｙ ＋ Ｓｍ）- Ｓｉａｌｏｎ 组份中， 在形成α-Ｓｉａｌｏｎ 时黄长石并不形成， 因此能获得依据相平衡计算所得的α′含量. Ｓｍ-Ｓｉａｌｏｎ 具有精细的显微结构， 较高的抗弯强度和断裂韧性， 这些特性能保留在（ Ｄｙ ＋ Ｓｍ）-Ｓｉａｌｏｎ 中. Ｄｙ- Ｓｉａｌｏｎ 具有较高的硬度，其α-Ｓｉａｌｏｎ 相在热处理时十分稳定， 这些特征也能保留于（ Ｄｙ＋ Ｓｍ）- Ｓｉａｌｏｎ 中因此， （ Ｄｙ ＋ Ｓｍ）-α-β-Ｓｉａｌｏｎ 的热稳定性好， 并具有良好的力学性能.
The phase control, mechanical properties and microstructures of α-β-Sialon ceramics were compared among the three counterpart Dy-, Sm-
and (Dy+Sm)-α-β-Sialon compositions. The results show that the dulpex Ln-α-β-Sialon possesses advantage over the single
Ln-α-β-Sialon. Unlike Sm-Sialon, in the (Dy+Sm)-Sialon compositions melilite phase does not occurs during the formation of
α-Sialon. Therefore, the phase compositions based on phase equilibrium can be easily controlled. Sm-Sialons have a rather finer microstructure, higher flexural strength and fracture toughness. These characteristics can
remain in (Dy+Sm)-Sialon ceramics. Dy-Sialons possess a higher hardness and Dy-α’ is much stable than Sm-β’ during heat treatment, which can also
remain in (Dy+Sm)-Sialon ceramics. Therefore, (Dy+Sm)-α-β-Sialon ceramics are quite stable during heat treatment and possesses good mechanical properties.
参考文献
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