Effect of MgO additions on the phase stability and degradation ability in ZrO2–Al2O3 composite systems
Source abstract
Abstract
Abstract The present study investigates the effect of MgO additions in the ZrO 2 –Al 2 O 3 composite system. An in situ citrate–nitrate sol–gel process was used to carry out four different concentrations of MgO additions in the ZrO 2 –Al 2 O 3 composite system and the results were compared with the pure ZrO 2 –Al 2 O 3 composite system synthesized by the similar process. The characterization results confirmed the formation of pure tetragonal zirconia ( t -ZrO 2 ) phase for all the investigated compositions at 900 °C. Pure ZrO 2 –Al 2 O 3 composite powders resulted in the degradation to yield monoclinic zirconia ( m -ZrO 2 ) at 1100 °C whereas the MgO containing ZrO 2 –Al 2 O 3 composite powders restricted the formation of m -ZrO 2 till 1200 °C. The reaction between MgO and Al 2 O 3 to form magnesium aluminate (MgAlO 4 ) started to occur from 1000 °C and its quantitative yield was dependent on the two important factors namely the MgO content and heat treatment temperatures. The complete formation of MgAlO 4 at 1200 °C resulted in the onset of ZrO 2 degradation to yield m -ZrO 2 at 1200 °C.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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