Abstract
氧化鋯陶瓷的熱穩定與其表面狀況有著密切的關係。在外加應力或是低溫退火的情況下，正方體氧化鋯多晶當中的正方晶，會自發性地轉變為穩定的單斜晶，因而至喪失原來正方晶所具有之優良機械性質。為了安定化氧化鋯當中的正方晶，於是採用液體滲透的方式，把額外的穩定劑（氧化鈰），引入到含有2 mol%及3 mol%氧化釔的氧化鋯陶瓷體，以改變該陶瓷體表面的性質。實驗進行方面，依照田口方式，以直交表規劃實驗的條件。在目前控制的因子條件下，以滲透方式所做表面改質的效果，不如改變氧化鋯基質當中氧化釔含量的效果來得顯著。另外一項針對滲透技術的實驗則發現：滲透溶液當中鈰的濃度，對正方體氧化鋯多晶的機械性質以及熱穩定性影響很大。不過以現行的滲透條件，鈰元素在試片當中的分佈尚屬平均。而且以高濃度溶液所滲透的試片，其熱穩定性雖有改善，但機械性質卻比較差。總而言之，雖然以液體滲透方式，把額外的物質引入欲改良的物體，確有其可行之處，然而未來還須針對如何精密控制該物質的量與分佈，在詳加探討，如此才能增加其實用價值。The essence of the thermal stability of ZrO2 ceramics ison its external surface. The meta- stable tetragonal phasein TZP would spontaneously transform to stable monoclinic phasein assistance with applied stress or low temperatureannealing. In order to retain the tetragonal phase for bettermechanical properties, extra oxide stabilizer (CeO2) wasintroduced into 2 mol% and 3 mol% Y2O3 -ZrO2 ceramics by theliquid infiltration tech- nique to modify the nature of thesurface. According to the result of the orthogonal arrayexperiment, the effect of surface modification by infiltrationis less significant than that of Y2O3 content in the ZrO2matrix in the current factor levels. A deliberate experimentto study the in- filtration process showed that theconcentration of Ce-containing solution played an importantrole in the mechanical properties and thermal stability of TZP.However, the Ce distribution was uniform within the samplesand the mechanical properties became degraded, especially inthe high concentra- tion of Ce-containing solution. A furtherinvest- gation to well control the distribution of Cestabilizer by the liquid infiltration technique is required.