TY - JOUR
T1 - Aqueous gelcasting of ZrB 2-SiC ultra high temperature ceramics
AU - He, Rujie
AU - Zhang, Xinghong
AU - Hu, Ping
AU - Liu, Chen
AU - Han, Wenbo
PY - 2012/9
Y1 - 2012/9
N2 - ZrB 2-SiC ultra high temperature ceramics containing B 4C and C as sintering additives were successfully prepared by aqueous gelcasting and pressureless sintering. Polyacrylic acid (PAA) was used as the dispersant throughout this research. The various effects of zeta potential, pH value, dispersant concentration, solid loading and ball-milling time on the rheology and fluidity behavior of ZrB 2-SiC suspension were investigated in detail. A well-dispersed suspension with 50 vol.% solid loading was prepared at pH 10 with 0.4 wt.% PAA after ball milling at 240 rpm for 24 h. Then crack-free green ZrB 2-SiC ceramics were obtained by gelcasting process and then pressureless sintered at 2100 °C to about 98% relative density. The microstructure and mechanical properties were examined, and the flexural strength and fracture toughness were 405 ± 27 MPa and 4.3 ± 0.3 MPa m 1/2, respectively.
AB - ZrB 2-SiC ultra high temperature ceramics containing B 4C and C as sintering additives were successfully prepared by aqueous gelcasting and pressureless sintering. Polyacrylic acid (PAA) was used as the dispersant throughout this research. The various effects of zeta potential, pH value, dispersant concentration, solid loading and ball-milling time on the rheology and fluidity behavior of ZrB 2-SiC suspension were investigated in detail. A well-dispersed suspension with 50 vol.% solid loading was prepared at pH 10 with 0.4 wt.% PAA after ball milling at 240 rpm for 24 h. Then crack-free green ZrB 2-SiC ceramics were obtained by gelcasting process and then pressureless sintered at 2100 °C to about 98% relative density. The microstructure and mechanical properties were examined, and the flexural strength and fracture toughness were 405 ± 27 MPa and 4.3 ± 0.3 MPa m 1/2, respectively.
KW - Aqueous gelcasting
KW - B. Microstructure-final
KW - C. Mechanical properties
KW - D. Borides
UR - https://www.scopus.com/pages/publications/84862666791
U2 - 10.1016/j.ceramint.2012.03.051
DO - 10.1016/j.ceramint.2012.03.051
M3 - Article
AN - SCOPUS:84862666791
SN - 0272-8842
VL - 38
SP - 5411
EP - 5418
JO - Ceramics International
JF - Ceramics International
IS - 7
ER -