添加氮化鈦於釔安定氧化鋯微觀結構分析及應用

本實驗以不同比例氮化鈦(10、20、30 wt%)添加於釔安定氧化鋯(3mol.% yttria-stabilized zirconia)，分別以熱壓(hot-pressed)與無壓(pressureless)燒結，探討不同比例氮化鈦添加於釔安定氧化鋯的顯微結構、機械性質等影響，並探討氮化鈦與釔安定氧化鋯，在微結構晶體以及兩相分佈關係，第二相的產生情況，以及氮化鈦的比例對於氧化鋯相結構之影響。實驗結果顯示在熱壓成型法中，適當添加氮化鈦於釔安定氧化鋯可抑制釔安定氧化鋯晶粒大小；有類似安定化元素(Y3+、Mg2+等)的效果，能夠維持在以正方晶為主之結構，不因溫度的降低而發生相變態，造成體積上異向性膨脹破壞。也因高強硬度的氮化鈦添加於釔安定氧化鋯，而使其硬度、韌性得到提昇。TEM顯微結構方面，透過選區繞射與EELS對氮化鈦擴散進入氧化鋯晶粒做元素分析，得到Ti與N元素存在，即為是TiN存在於YSZ晶粒中。也對各相晶粒作選區繞射，可發現除氮化鈦擴散入釔安定氧化鋯的晶粒為立方晶相，在其它區域亦有觀察到板狀變形雙晶，以及針狀相變雙晶。

關鍵字

氮化鈦；釔安定氧化鋯；微結構；電子顯微鏡

並列摘要

The different content TiN added 3 mol% yttria stabilized zirconia were researc- hed in this study. The specimens were hot-pressed and uniaxial compacted and sintered under 50 MPa at 1450oC and held temperature for 2.5 hr, to investigate their microstructures and mechanical properties, and also further research on microstructure change, phase distribution and second phase. The results in this study show that the TiN added to 3YSZ can suppress t-YSZ to m-YSZ phase transformation, and reduce YSZ grain size. Its function was similar with Y3+ or Mg2+ cations that stabilized tetragonal structure retained at room temperature. Further also improve the hardness and toughness in the samples due to addition of high hardness TiN. Structures were confirmed by the SADPs of the specific grain, the structure of the YSZ which encircled TiN in the 3YSZ/TiN(70/30) samples was cubic structure. The SADP and EELS analysis showed that the Ti and N elements were detected in the aggregates that exist within YSZ matrix. It also can be observed the two type of the twin structure, lenticular and lamellar-like

並列關鍵字

Zirconia ； TiN ； Microstructure ； TEM

參考文獻

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國際替代計量

添加氮化鈦於釔安定氧化鋯微觀結構分析及應用

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