| Summary: | 碩士 === 國立交通大學 === 材料科學與工程學系所 === 101 === 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.
|
|---|
