TY - GEN
T1 - The influence of nanosize carbon concentration on mechanical properties of RBSiC
AU - Da Silva, Cristiane Evelise Ribeiro
AU - Trejo, Rosa
AU - Shim, Sanghoon
AU - Lara-Curzio, Edgar
AU - Costa, Celio A.
PY - 2010
Y1 - 2010
N2 - The use nanosize carbon on the processing of RBSiC was studied. The materials were prepared in two different compositions, 28/72 and 50/50 wt % of nanosize carbon (CN) and SiC, respectively. Molten silicon was infiltrated at 1550°C in vacuum, resulting in 19-14 wt% of free silicon and about 74 wt% of SiC. When 50 wt% of CN was used, there was nucleation and growth of SiC in the metallic Si phase, while for the 28 wt% CN the nucleation was not observed and the growth might have happened in the SiC of the preform. Four point flexural tests were conducted at room temperature and 400, 800 and 1200°C, and both compositions showed the same behavior for all tested temperatures, especially with respect to the stiffness. Nanoindentation tests were conducted, given a measured hardness of 24 GPa and an elastic modulus of 294 and 282 GPa for the 50/50 and 28/72 wt % compositions, respectively. The microstructure showed potential for exhibiting high strength at high temperature, but improvement in processing conditions must be done.
AB - The use nanosize carbon on the processing of RBSiC was studied. The materials were prepared in two different compositions, 28/72 and 50/50 wt % of nanosize carbon (CN) and SiC, respectively. Molten silicon was infiltrated at 1550°C in vacuum, resulting in 19-14 wt% of free silicon and about 74 wt% of SiC. When 50 wt% of CN was used, there was nucleation and growth of SiC in the metallic Si phase, while for the 28 wt% CN the nucleation was not observed and the growth might have happened in the SiC of the preform. Four point flexural tests were conducted at room temperature and 400, 800 and 1200°C, and both compositions showed the same behavior for all tested temperatures, especially with respect to the stiffness. Nanoindentation tests were conducted, given a measured hardness of 24 GPa and an elastic modulus of 294 and 282 GPa for the 50/50 and 28/72 wt % compositions, respectively. The microstructure showed potential for exhibiting high strength at high temperature, but improvement in processing conditions must be done.
UR - http://www.scopus.com/inward/record.url?scp=79952399492&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:79952399492
SN - 9780470594674
T3 - Ceramic Engineering and Science Proceedings
SP - 87
EP - 95
BT - Mechanical Properties and Performance of Engineering Ceramics and Composites V - A Collection of Papers Presented at the 34th International Conference on Advanced Ceramics and Composites, ICACC'10
T2 - Mechanical Properties and Performance of Engineering Ceramics and Composites V - 34th International Conference on Advanced Ceramics and Composites, ICACC'10
Y2 - 24 January 2010 through 29 January 2010
ER -