Preparing Porous Si-based Ceramic Core Using Thermosetting Silicon Resin Injection Method

doi:10.15541/jim20140280

Abstract

Abstract:

The porous Si-based ceramic core was prepared using injection method, where quartz glass powders were used as original materials and thermosetting silicon resin was used as plasticizer. The effect of sintering temperature and holding time on the properties of the samples were examined. It was found that the process of devitrification was accelerated with the increase of sintering temperature while the glass phase transforms into cristobalite gradually. When sintering temperature was at 1250℃, the amount of cristobalite increased with the extension of holding time. Linear shrinkage rate and weight loss of the samples slightly increased with the increase of sintering temperature. But the holding time showed less effect on linear shrinkage rate and weight loss of the samples. In fact, the weight loss of the sample was mainly caused by decomposition of silicon resin. The sample sintered at 1250℃ for 10 h showed linear shrinkage of 0.93%, the porosity of 32.8% and bending strength of 9.08 MPa.

Key words: porous, silicon resin, ceramic core, linear shrinkage rate, bending strength, porosity

CLC Number:

TQ174

YANG Zhi-Gang, YU Jian-Bo, LI Chuan-Jun, XUAN Wei-Dong, ZHANG Zhen-Qiang, DENG Kang, REN Zhong-Ming. Preparing Porous Si-based Ceramic Core Using Thermosetting Silicon Resin Injection Method[J]. Journal of Inorganic Materials, 2015, 30(2): 147-152.

Figures/Tables 11

Fig. 1 TG analysis of silicone resin

Fig. 2 XRD patterns of the samples prepared at different conditions

Fig. 3 XRD patterns of the samples prepared at 1250℃ holding for 2 h (a), 6 h (b), 8 h (c) and 10 h (d)

Fig. 4 Linear shrinkage rate and weight loss of the samples prepared at different sintering temperature holding for 2 h

Fig. 5 Linear shrinkage rate and weight loss of the samples prepared at 1250℃ for different holding time

Fig. 6 Bulk-density and apparent porosity of the samples prepared at different sintering temperature and holding for 2 h

Fig. 7 Bulk-density and apparent porosity of the samples prepared at 1250℃ for different holding time

Fig. 8 Bending strength of the samples prepared at different sintering temperature and holding for 2 h

Fig. 9 Bending strength of the samples prepared at 1250℃ for different holding time

Fig. 10 Fracture micrographs of the samples prepared at different conditions (a) green body; (b) 1200℃ for 2 h; (c) 1250℃ for 2 h; (d) 1300℃ for 2 h

Fig. 11 Fracture micrographs of the samples prepared at 1250℃ for different holding time (a) 6 h, (b) 8 h and (c)10 h

References 13

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