Aqueous gelcasting of ZrB 2-SiC ultra high temperature ceramics

Rujie He; Xinghong Zhang; Ping Hu; Chen Liu; Wenbo Han

doi:10.1016/j.ceramint.2012.03.051

Aqueous gelcasting of ZrB ₂-SiC ultra high temperature ceramics

Rujie He^*, Xinghong Zhang, Ping Hu, Chen Liu, Wenbo Han

^*Corresponding author for this work

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

66 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	5411-5418
Number of pages	8
Journal	Ceramics International
Volume	38
Issue number	7
DOIs	https://doi.org/10.1016/j.ceramint.2012.03.051
Publication status	Published - Sept 2012
Externally published	Yes

Keywords

Aqueous gelcasting
B. Microstructure-final
C. Mechanical properties
D. Borides

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10.1016/j.ceramint.2012.03.051

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title = "Aqueous gelcasting of ZrB 2-SiC ultra high temperature ceramics",

abstract = "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.",

keywords = "Aqueous gelcasting, B. Microstructure-final, C. Mechanical properties, D. Borides",

author = "Rujie He and Xinghong Zhang and Ping Hu and Chen Liu and Wenbo Han",

year = "2012",

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doi = "10.1016/j.ceramint.2012.03.051",

language = "English",

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journal = "Ceramics International",

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TY - JOUR

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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

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DO - 10.1016/j.ceramint.2012.03.051

M3 - Article

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SN - 0272-8842

VL - 38

SP - 5411

EP - 5418

JO - Ceramics International

JF - Ceramics International

IS - 7

ER -

Aqueous gelcasting of ZrB ₂-SiC ultra high temperature ceramics

Abstract

Keywords

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