TY - JOUR
T1 - Effects of the content of in-situ grown mullite on the microstructure and mechanical properties of 3Y-TZP ceramics fabricated by gel-casting
AU - Huang, Yanqi
AU - Liu, Peng-fei
AU - Li, Zhuan
AU - Xiao, Peng
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The effects of different content of mullite on the microstructure and mechanical properties of in-situ mullite toughened 3Y-TZP ceramics (Mullite/3Y-TZP composite ceramics) prepared by gel-casting combined with pressureless sintering were observed in this study. The results indicated when the content of mullite was low (2–4 mol%), especially in 4 mol%, mullite showed regular columnar structure and the size of columnar mullite was larger. When the content got higher (> 6 mol%), mullite showed a granular or even fluid shape and was connected to each other. In addition, the bending strength and fracture toughness of the samples showed a trend of rising first and then decreasing with the increase of the content of mullite, but the hardness had been declining. The sample containing 4 mol% mullite had the best mechanical properties (hardness reached 13.02 GPa, bending strength reached 907.31 MPa and fracture toughness reached 10.38 MPa m
1/2). Furthermore, mullite, alumina and zirconia particles played an important role in toughening reinforcement due to pinning effect.
AB - The effects of different content of mullite on the microstructure and mechanical properties of in-situ mullite toughened 3Y-TZP ceramics (Mullite/3Y-TZP composite ceramics) prepared by gel-casting combined with pressureless sintering were observed in this study. The results indicated when the content of mullite was low (2–4 mol%), especially in 4 mol%, mullite showed regular columnar structure and the size of columnar mullite was larger. When the content got higher (> 6 mol%), mullite showed a granular or even fluid shape and was connected to each other. In addition, the bending strength and fracture toughness of the samples showed a trend of rising first and then decreasing with the increase of the content of mullite, but the hardness had been declining. The sample containing 4 mol% mullite had the best mechanical properties (hardness reached 13.02 GPa, bending strength reached 907.31 MPa and fracture toughness reached 10.38 MPa m
1/2). Furthermore, mullite, alumina and zirconia particles played an important role in toughening reinforcement due to pinning effect.
KW - Gel-casting
KW - Mechanical properties
KW - Microstructure
KW - Mullite
KW - Toughening mechanism
UR - http://www.scopus.com/inward/record.url?scp=85052984380&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2018.08.298
DO - 10.1016/j.ceramint.2018.08.298
M3 - Journal article
SN - 0272-8842
VL - 44
SP - 21882
EP - 21892
JO - Ceramics International
JF - Ceramics International
IS - 17
ER -