| Effect of Nano-ZrO2 Addition on Microstructure,
Mechanical Property and Thermal Shock Behaviour
of Dense Chromic Oxide Refractory Material |
Lixia Lu, Lizhi Di,1 Chunhui Ding, Chi Zhang and De’an Yang*
pages : 162-168
DOI : 10.1080/0371750X.2015.1054039 |
| Abstract |
| To obtain a good performance hot-face lining material in gasifier, nano-ZrO2, up to 5 wt%, was added into chromic
oxide powder with 3 wt% TiO2 followed by sintering at 1500oC for 2.5 h. The effect of nano-ZrO2 addition on
microstructure, mechanical property and thermal shock behaviour was studied. ZrO2 promoted densification at
contents higher than 1 wt%. Microcracks and phase transformation toughened the dense chromic oxide refractory
material. The main reason for decrease of strength was the existence microcracks in specimens and weakening of
intergranular fracture. Dense chromic oxide refractory material with 2~3 wt% nano-ZrO2 possessed good
densification, uniform microstructure, normal mechanical property and proper thermal shock resistance. The rupture
strength retention ratio was nearly twice than that of chromic oxide material without ZrO2 after three cycles of
quenching test from 950oC to cold water.
[Keywords: Chromic oxide material, Zirconia, Mechanical, Thermal shock behaviour] |
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