On the sintering kinetics of titania doped ceramic lanthanum chromite
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The sintering behaviour of lanthanum chromite with the addition of 1 to 3 wt% TiO2 was studied. Densification was examined as a function of sintering temperature and TiO2 concentration. The results showed that pure LaCrO3 could not be densified to >75% of the theoretical density, while the densities exceeding 90% of the theoretical were achieved with 3 wt% titania addition at 1600° C.
Metallographic study reveals a normal grain growth following the rate equationD 2−D 0 2 =kt. Activation energies both for densification and grain growth have been estimated to be ≈ (80±5) k cal/mole in case of 3 wt% TiO2 addition.
KeywordsActivation energy densification grain growth lanthanum chromite sintering kinetics
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