|About this Abstract
||Materials Science & Technology 2011
||Green Technologies for Materials Manufacturing and Processing III
||Enhanced Mechanical Property of Hot-Pressed RBSN Ceramics with Lu2O3-SiO2/La2O3-MgO additives
||Jae-Woong Ko, Sea-Hoon Lee, Hai-Doo Kim
|On-Site Speaker (Planned)
Reaction bonded Si<SUB>3</SUB>N<SUB>4</SUB> (RBSN) ceramics have many advantages for green technology such as low cost fabrication and small shrinkage during nitridation and post sintering. In this study, hot-pressed RBSN (Reaction-Bonded Silicon Nitride) ceramics were prepared by starting from cheap Si powder with sintering additives such as Lu<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB> and La<SUB>2</SUB>O<SUB>3</SUB>-MgO. A dense Si<SUB>3</SUB>N<SUB>4</SUB> ceramics with good mechanical properties were produced by hot pressing of RBSN with different sintering additives followed by nitridation. As a result, the mechanical properties of the resultant sintered RBSNs were more than 1 GPa in 4 point flexure strengths and fracture toughness values greater than 8 MPa.m<SUP>.</SUP>m<SUP>1/2</SUP>. Reinforced microstructures containing fine grains matrix with elongated grains could be developed for each of RE<SUB>2</SUB>O<SUB>3</SUB> plus MgO and SiO<SUB>2</SUB> compositions and resulted in substantial improvements in mechanical properties.