Fig. 7

Optical images of the interface between two layers for samples at (a) 1280 ᵒC, (b) 1300 ᵒC and (c) 1320 ᵒC sintering temperatures.

Optical images of the interface between two layers for samples at (a) 1280 ᵒC, (b) 1300 ᵒC and (c) 1320 ᵒC sintering temperatures.