|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||241 Microwave-Assisted Synthesis of B4C by Direct H3BO3 Carboreduction
||Rodolfo Foster Klein Gunnewiek, Pollyane Marcia Souto, Ruth Hertha Goldschmidt Aliaga Kiminami
|On-Site Speaker (Planned)
||Rodolfo Foster Klein Gunnewiek
Boron carbide is an advanced ceramic which is promising due to its excellent physical properties of super hardness, high elastic modulus, wear resistance and low-density neutron absorption (ρth=2,52g/cm3). The main route to produce this ceramic is by carbothermal reduction with carbon sources and boric acid in a conventional furnace at 1500°C for one to five hours. In this work, a mixture of boric acid and carbon black was placed in an alumina/mullite crucible and reacted in a microwave furnace at 1.8kW for 20 minutes under argon atmosphere. The microwave reaction of these components resulted in the synthesis of the B4C powder. This powder was subjected to X-ray diffraction, surface area analysis (BET method), and TEM and SEM imaging, which revealed highly crystalline boron carbide particles with an average size of 80nm.