Distribution of temperature during fibre laser radiation and effects thereon phase transformation of ZrO₂ engineering ceramic

Abstract

Distribution of surface and the bulk temperature was recorded during fibre laser surface treatment of ZrO 2 engineering ceramic. The experimental readings were then compared with a finite element model which showed the flow and distribution of the laser induced heat as a result of the fibre laser surface treatment. Moreover, thermogravimetry-differential scanning calorimetry was used to collect data with respect to physical changes during heating and cooling of the ZrO 2 engineering ceramic. The thermogravimetry-differential scanning calorimetry data and the finite element model predictions were then used to map the phase transitions within the ZrO 2 engineering ceramic resulting from fibre laser surface treatment. The mapping revealed that the fibre laser surface treatment had generally resulted in a phase transformation of the ZrO 2 engineering ceramic from the monoclinic (M) state to a mixture of tetragonal and cubic (TzC) followed by partially formed liquid (L) phase during fibre laser surface treatment and from L to TzC then T, followed by the M state during solidification.

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