Table 2 Experimental design of different additive amounts of colors.

From: Preparation and research of new black zirconia ceramics

NiTiO3 + NiAl2O4 + Fe2O3 (wt.%)

3YSZ (wt.%)

Sintering temperature (℃)

1

99

1350

4

96

1350

7

93

1350

10

90

1350