Reactive Phenomenon between Molten Titanium Alloy(Ti-6Al-4V) and CaZrO3/Y2O3 Composites
|摘要:||CaZrO3/Y2O3依照不同體積比混合後，經過1500℃/30min熱壓成陶瓷複合材料試片，並與鈦合金(Ti-6Al-4V)在1atm氬(Ar)氣氛下，進行1700℃/30min之高溫擴散反應，探討在此製程參數下，陶瓷材料與鈦合金高溫擴散反應介面之影響。本實驗用X光繞射儀(x-ray diffraction, XRD)、掃描式電子顯微鏡(SEM/EDS)，分析擴散後的介面反應微觀結構。
Various composites of CaZrO3 and Y2O3 were hot pressed at 1500°C /30 MPa for 30 min and then reacted with titanium alloy (Ti-6Al -4V) at 1700°C/30 min. The microstructure of the reaction interface was characterized and analyzed using x-ray diffraction (XRD) and scanning electron microscopy (SEM/EDS). The XRD spectra only for the as hor pressed ceramic composites indicated that CaZrO3/Y2O3 were stable during the heat treatment, and no new compound were found except solid solution. Pure CaZrO3 had slightly reaction with Ti-6Al-4V, and it’s the only one sample formed more than one reaction layer in the metal side. A reaction layer, which consisting of Y2O3 were formed and then was suppressed the interaction between titanium alloy and composites. Besides, The thickness of this reaction layer increased with increasing Y2O3, and obviously less interaction happened. When the content of Y2O3 was increased up to 90 vol%, it was behavior as a pure Y2O3 contact with Ti-6Al-4V, there were no reaction between each other. It seems that Y2O3 had higher stability and thus a better material for the mold of molten titanium alloy compared with CaZrO3.