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This work is focused on the effect of amorphous SiO2 addition on the phase transformation and microstructural evolution of ZrO2 particles. Considering the structural similarities between the amorphous ZrO2 and its tetragonal structure, XRD results showed initial nucleation of metastable tetragonal ZrO2 from its amorphous matrix upon heat treatment. This metastable phase is unstable in pure ZrO2 sample and transforms to a stable monoclinic phase at around 600 C. However, addition of amorphous SiO2 to ZrO2 structure causes metastable tetragonal phase to remain stable up to around 1100 C. The temperature range for stability of metastable tetragonal ZrO2 structure increased from about 150 oC in pure ZrO2 particles to * :یکینورتکلا تسپ ،تابتاکم لوئسم : mousa.farhadian@ma.iut.ac.ir D ow nl oa de d fr om ja m e. iu t.a c. ir at 1 5: 17 IR S T o n T hu rs da y D ec em be r 31 st 2 02 0 [ D O I: 10 .4 71 76 /ja m e. 39 .2 .1 80 51 ]

Effect of Amorphous Silica Addition on Martensitic Phase Transformation of Zirconia and Investigation of its Tetragonal Structure Stability Mechanisms