4831621687

-IDU    *DU    OUU    4ZAJ

Figurę 4.8 Thermogravimetric and differential thermogravimetric curv^łes of

CPMT andTCPMT.

4.3.5 Physical and inechanical properties of fi red samples

The main physical and inechanical properties of fired saniples at different temperatures are presented in Figurę 4.9. The increase of firing temperaturę from 950 to 1050°C leads to increase firing shrinkage, loss on ignition, flexural strength and apparent density, while open porosity and water absorption decreased significantiy.

CPMT and TCPMT fired saniples present very different properties. The flexural strength was increased in the case of CPMT from 4.6 (950°C) to 23.3 MPa (1050°C) while it was increased to reach a maximum of 3.1 MPa witli TCPMT fired samples. Simultaneously, open porosity and water absorption decreased significantiy when increasing the firing temperaturę. Tliis behavior is morę pronounced with CPMT fired samples where open porosity and water absorption decreased to reach respectively 5 wt.% and 2 wt.% at 1050°C. However, unhke CPMT fired samples, TCPMT fired

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