MICROWAVE FUSION OF A LOW-FUSING TITANIUM BODY PORCELAIN COATING DERIVED FROM FACILE SOL-GEL COMBUSTION SYNTHESIS

Titanium body porcelains were synthesised through the sol-gel combustion method by using carbamide and glycine as the composite organic fuels with a mole ratio of 7:3. Then the synthesised porcelain was microwave fused on the Ti surface. The porcelain was characterised by X-ray diffradion and scanning electron microscope tests. The XRD results showed that the body porcelains ignited at 400, 500 and 600 degrees C were all amorphous. When the ignited temperature is only 900 degrees C, some crystalline diffraction peaks of KNO3 existed due to the incomplete combustion reaction. When the igniting temperature was elevated to 500 and 600 degrees C or a higher ratio of fuel to nitrates (1.25:1 and 1.5:1) was employed, the nitrates completely reacted and there was no obvious nitrate residue. The size and quantity of the pores slightly increased with the ratio of fuel to nitrates increased from 1:1 to 1.5:1. A dense coating with a homogeneous vitreous structure was fused on the Ti surface by microwaves.