Formation of Spinel-Magnesia-Carbon Composit Clinker by Utilizing MgO and Al-Mg Alloy

Abstract

The　spinel－magnesia　composite　clinker　has　been　prepared　trough　heating　of　a　MgO Al12－Mg17 compact atmosphere．A112Mg17alloy　changes　into　A14C3，spinel，MgO　and　carbon　at　Iower temperature．Further，the Al4C3reacts　with　MgO　and　CO　gas　at　elevated　temperatures　to　form　spinel　and　carbon．The　precipitated carbon　phase　is　amorphous　and　finely　distributed　among　the　sphlel　and　MgO　phases．In　comparing　with　the other　obtained　clinkers，presented　in　the　previous　works［utilizing　MgO-AI　or　MgO-（A120C）0.5（AlN〉0.5 compacts]1）・2），the　present　clinker　forms　at　lower　temperature，but　it　oxidizes　at　lower　temperature　either．