Rheological Properties of SiC-ZrB2 Composite Suspensions

doi:10.3724/SP.J.1077.2012.12641

Abstract

Abstract:

The SiC-ZrB₂ composite slurry was investigated as preliminary work for the preparation of high-performance SiC-ZrB₂ reticulated porous ceramics (RPCs). The dispersions of SiC and ZrB₂ powders were investigated, and the amounts of dispersant and adhesive were optimized, respectively. Based on these results, the investigation focused on the influences of the solid loading and the ZrB₂ amount on the rheological behavior of suspensions. The suspension with 65wt% solid loading was chosen as the optimum for polymeric sponge replication process. And the ZrB₂ amount should be less than 25wt%.

Key words: SiC, ZrB₂, CMC, silica sol, rheological properties

CLC Number:

TQ174

LI Dan, YAO Xiu-Min, YANG Yong, HUANG Zheng-Ren. Rheological Properties of SiC-ZrB₂ Composite Suspensions[J]. Journal of Inorganic Materials, 2013, 28(5): 566-570.

Figures/Tables 7

Table 1 Chemical composition of original powders (wt%)

	SiC	Al₂O₃	SiO₂	MgO	Fe₂O₃	CaO	R₂O*
Silicon carbide	99.3	-	-	-	0.23	-	-
Alumina	-	99.60	0.06	-	0.01	0.03	0.21
Kaolin	-	35.86	48.67	0.19	0.28	-	2.05
Bentonite	-	14.78	61.46	2.30	3.67	3.18	4.07

Fig. 1 Zeta potential as a function of pH for SiC and ZrB2 powders dispersed in deionized water

Fig. 2 Viscosity curves of the suspensions with various silica sol concentrations

Fig. 3 Flow curves of the suspensions with various amounts of CMC

Fig. 4 Flow curves of suspensions with various solid loadings and 25wt% ZrB2 amount

Fig. 5 Flow curves of the suspensions with various ZrB2 additive amounts

Fig. 6 Viscosity curves of the suspensions with various ZrB2 additive amounts

References 21

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Rheological Properties of SiC-ZrB₂ Composite Suspensions

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