TY - JOUR
T1 - Fabrication of in-situ Ti(C,N) phase toughened Al2O3 based ceramics from natural bauxite
AU - Li, Ziyan
AU - Fu, Lvping
AU - Gu, Huazhi
AU - Or, Siu Wing
AU - Huang, Ao
AU - Lv, Renxiang
N1 - Funding Information:
This work is financially supported by the National Natural Science Foundation of China (Grant No. 51802231 ), the Hong Kong Scholars Program (Grant No. XJ2020023 ), the China Postdoctoral Science Foundation (Grant No. 2017M622535 ), and the WUST National Defence Pre-research Foundation (Grant No. GF201905 ).
Publisher Copyright:
© 2021 Elsevier Ltd and Techna Group S.r.l.
Funding Information:
This work is financially supported by the National Natural Science Foundation of China (Grant No. 51802231 ), the Hong Kong Scholars Program (Grant No. XJ2020023 ), the China Postdoctoral Science Foundation (Grant No. 2017M622535 ), and the WUST National Defence Pre-research Foundation (Grant No. GF201905 ).
Funding Information:
This work is financially supported by the National Natural Science Foundation of China (Grant No. 51802231), the Hong Kong Scholars Program 2020 (Grant No. G-YZ4E/ XJ2020023), the China Postdoctoral Science Foundation (Grant No. 2017M622535), and the WUST National Defence Pre-research Foundation (Grant No. GF201905).
Publisher Copyright:
© 2021 Elsevier Ltd and Techna Group S.r.l.
PY - 2021/9/15
Y1 - 2021/9/15
N2 - Al2O3–Ti(C,N) ceramics were fabricated via carbothermal reduction nitridation method with high-titania special-grade bauxite as the raw material. The formation mechanism of in-situ Ti(C,N) phase and its effect on the properties of materials are discussed. After nitrided at 1700 °C, Ti(C,N) phase could be formed in-situ with appropriate C/TiO2 molar ratio. Due to the residual stress field formed by Ti(C,N) particles, the path of crack propagation is changed, leading to the crack deflection and pinning. Therefore, the mechanical properties of the materials are improved by forming in-situ Ti(C,N) phase. With a C/TiO2 molar ratio of 2.2 and nitridation temperature of 1700 °C, Al2O3–Ti(C,N) ceramic with a hardness of 13.9 GPa, a fracture toughness of 8.28 MPa m1/2 and a flexural strength of 387 MPa could be fabricated.
AB - Al2O3–Ti(C,N) ceramics were fabricated via carbothermal reduction nitridation method with high-titania special-grade bauxite as the raw material. The formation mechanism of in-situ Ti(C,N) phase and its effect on the properties of materials are discussed. After nitrided at 1700 °C, Ti(C,N) phase could be formed in-situ with appropriate C/TiO2 molar ratio. Due to the residual stress field formed by Ti(C,N) particles, the path of crack propagation is changed, leading to the crack deflection and pinning. Therefore, the mechanical properties of the materials are improved by forming in-situ Ti(C,N) phase. With a C/TiO2 molar ratio of 2.2 and nitridation temperature of 1700 °C, Al2O3–Ti(C,N) ceramic with a hardness of 13.9 GPa, a fracture toughness of 8.28 MPa m1/2 and a flexural strength of 387 MPa could be fabricated.
KW - AlO based ceramic
KW - Bauxite
KW - Mechanical properties
KW - Ti(C,N)
KW - Toughening
UR - http://www.scopus.com/inward/record.url?scp=85107160218&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2021.05.273
DO - 10.1016/j.ceramint.2021.05.273
M3 - Journal article
AN - SCOPUS:85107160218
SN - 0272-8842
VL - 47
SP - 25497
EP - 25504
JO - Ceramics International
JF - Ceramics International
IS - 18
ER -