Study on t-ZrO2 Phase Transition to ImproveTensile Strength of Enamel

Abstract

Abstract: The mechanical properties of the enamel coating were enhanced by adding tetragonal zirconium oxide (t-ZrO₂). The changes in the surface strain of the enamel were researched through a three-point bending experiment, and the fracture section is analyzed by XRD, SEM, and Raman. The results show that adding a proper amount of t-ZrO₂ improves the surface morphology of the enamel and reduces the number of pores. In the three-point bending experiment, the maximum force of the enamel with 2%t-ZrO₂ mass content increases by 7 kN. Cracks appear under the action of 11 kN three-point bending pressure, and the strain value increases by about 37%. The t-ZrO₂ enamel sample has a phase transition from t-ZrO₂ to m-ZrO₂ before and after the fracture. The crack deflection occurs at the boundary between the t-ZrO₂ phase and the original enamel phase, which restricts the crack propagate.

Key words: enamel, zirconia phase transition, three-point bending experiment, strain analysis, crack propagate

CLC Number:

TQ173

LI Zhiheng, XU Kunshan, XU Wenyou, XUE Hongxi, LIU Jie. Study on t-ZrO₂ Phase Transition to ImproveTensile Strength of Enamel[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 622-629.

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Study on t-ZrO₂ Phase Transition to ImproveTensile Strength of Enamel

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