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首页> 外文会议>Asian Pacific Conference on Fracture and Strength;APCFS; 20061122-25;20061122-25; Sanya(CN);Sanya(CN) >In-Situ Toughened α-Sialon Ceramics Doped with Lutecia and Ytterbia
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In-Situ Toughened α-Sialon Ceramics Doped with Lutecia and Ytterbia

机译：Lutecia和Ytterbia掺杂的原位增韧α-Sialon陶瓷

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摘要

Ytterbia and Lutecia were adopted to stabilize α-sialon ceramics during a two-step hot press sintering, respectively. Although Yb~(3+) and Lu~(3+) possess the similar small ion size (0.86 A and 0.85 A) as two adjacent rare-earth elements, Yb- and Lu-a-sialon ceramics present very different microstructure and properties. Yb-a-sialon ceramic is fully composed of a-sialon phase without any secondary phase. The ceramic incorporated with LU_2O_3 also consists of a-sialon phase, but a trace amount of intergranular phase J' (Lu_4Si_(2-x)Al_xO_(7+x)N_(2-x)) still remains at the boundary. Microstructure observation indicates the fully equiaxial grain morphology of Yb-a-sialon ceramic. However, elongated grains appear in the Lu-a-sialon ceramic, coexisting with small equiaxed grains. Owing to the almost full a-sialon phase assemblage, both ceramics present high hardness with the value of over 21 GPa. Lu-a-sialon ceramic possesses good toughness, which is attributed to the elongated grains assisting the facilitation of toughening mechanism. The equiaxied grain morphology results in a comparatively lower toughness for Yb-a-sialon ceramic.
机译：在两步热压烧结过程中，分别采用Ytterbia和Lutecia来稳定α-sialon陶瓷。尽管Yb〜（3+）和Lu〜（3+）与两个相邻的稀土元素具有相似的小离子尺寸（0.86 A和0.85 A），但是Yb-和Lu-a-SiAllon陶瓷呈现出非常不同的微观结构和性能。 Yb-a-sialon陶瓷完全由a-sialon相组成，没有任何次级相。与LU_2O_3结合的陶瓷也由a-赛隆相组成，但痕量的晶间相J'（Lu_4Si_（2-x）Al_xO_（7 + x）N_（2-x））仍保留在边界处。显微组织观察表明，Yb-a-赛隆陶瓷具有完全等轴的晶粒形态。但是，细长的晶粒出现在Lu-a-sialon陶瓷中，与小的等轴晶粒共存。由于几乎完全形成了a-sialon相，两种陶瓷都具有很高的硬度，其值超过21 GPa。 Lu-a-Siialon陶瓷具有良好的韧性，这归因于拉长的晶粒有助于增韧机理。等化的晶粒形态导致Yb-a-Siialon陶瓷的韧性较低。

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