Samples were burned inside of a programmable furnace (Nabertherm controller B 170, Nabertherm GmbH, Lilienthal, Germany) at 700 8C and heated at a rate of 5 8C/min.
Samples were burnedinside of a programmable furnace (Nabertherm controller B170, Nabertherm GmbH, Lilienthal, Germany) at 700 8C andheated at a rate of 5 8C/min.
Samples were burned inside of a programmable furnace (Nabertherm controller B 170, Nabertherm GmbH, Lilienthal, Germany) at 700 8C and heated at a rate of 5 8C/min.