TY - JOUR
T1 - Crack healing and strength recovery in SiC/spinel nanocomposite
AU - Tavangarian, Fariborz
AU - Li, Guoqiang
N1 - Funding Information:
This study was financially supported by National Science Foundation under Grant number CMMI 1333997 , the Cooperative Agreement NNX11AM17A between NASA and the Louisiana Board of Re-gents under contract NASA/LEQSF(2011-14)-Phase3-05 , and Army Research Office under Grant number W911NF-13-1-0145 .
PY - 2015/8/1
Y1 - 2015/8/1
N2 - The crack healing behavior and the strength recovery of the newly introduced SiC/spinel nanocomposite were investigated. SiC/spinel nanocomposite containing 27.26 wt% SiC was prepared by the ball milling of talc, graphite and aluminum powders with subsequent annealing at 1200 °C for 1 h in a vacuum. The SEM results showed that the surface cracks produced by Vickers indenter on the prepared SiC/spinel pellets can be completely healed after sintering at 1545 °C for 1 min in air atmosphere. Furthermore, an almost complete strength recovery of the specimens can be obtained in those samples heat treated at 1550 °C for 1 min, as evaluated by diametral tensile strength (DTS) test. The formations of mullite and aluminosilicate glassy phases are the major factors which are responsible for the crack healing and strength recovery in the structure. It was found that the healing efficiency of those specimens healed at 1550 °C for 1 min is 99%.
AB - The crack healing behavior and the strength recovery of the newly introduced SiC/spinel nanocomposite were investigated. SiC/spinel nanocomposite containing 27.26 wt% SiC was prepared by the ball milling of talc, graphite and aluminum powders with subsequent annealing at 1200 °C for 1 h in a vacuum. The SEM results showed that the surface cracks produced by Vickers indenter on the prepared SiC/spinel pellets can be completely healed after sintering at 1545 °C for 1 min in air atmosphere. Furthermore, an almost complete strength recovery of the specimens can be obtained in those samples heat treated at 1550 °C for 1 min, as evaluated by diametral tensile strength (DTS) test. The formations of mullite and aluminosilicate glassy phases are the major factors which are responsible for the crack healing and strength recovery in the structure. It was found that the healing efficiency of those specimens healed at 1550 °C for 1 min is 99%.
UR - http://www.scopus.com/inward/record.url?scp=84929269195&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84929269195&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2015.03.088
DO - 10.1016/j.ceramint.2015.03.088
M3 - Article
AN - SCOPUS:84929269195
VL - 41
SP - 8702
EP - 8709
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 7
ER -