The influence of air and nitrogen atmosphere during heating on TiO2 nano and
micro sized powders as well as sintered polycrystalline specimens was
analyzed. Sintering of TiO2 nano and micro powders in air atmosphere was
monitored in a dilatometer. Non compacted nano and micro powders were
analyzed separately in air and nitrogen atmospheres during heating using
thermo gravimetric (TG) and differential thermal analysis (DTA). The anatase
to rutile phase transition temperature interval is influenced by the powder
particle size and atmosphere change. At lower temperatures for nano TiO2
powder a second order phase transition was detected by both thermal
techniques. Polycrystalline specimens obtained by sintering from nano powders
were reheated in the dilatometer in nitrogen and air atmosphere, and their
shrinkage is found to be different. Powder particle size influence, as well
as the air and nitrogen atmosphere influence was discussed.
Influence of nitrogen and air atmosphere during thermal treatment on micro and nano sized powders and sintered TiO2 specimens