Mechanical Properties of 2-D Silica-Silica Continuous Fiber-reinforced Ceramic-matrix Composite Fabricated by Sol-Gel Infiltration

Ha Neul Kim; Dong Jun Kim; Eul Son Kang; Do Kyung Kim

Korean Journal of Materials Research, Vol.19, No.7, 391-396, July, 2009

DOI10.3740/MRSK.2009.19.7.391 Export Citation

Mechanical Properties of 2-D Silica-Silica Continuous Fiber-reinforced Ceramic-matrix Composite Fabricated by Sol-Gel Infiltration

Ha Neul Kim, Dong Jun Kim¹, Eul Son Kang², and Do Kyung Kim^†

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Daejeon 305-701, Korea
¹Department of Ceramic Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea
²Agency for Defense Development, Agency, Yusong P.O. Box 35-1, Daejeon, 305-600, Korea

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2-dimensional silica-silica Continuous Fiber-reinforced Ceramic.matrix Composites (CFCCs) were fabricated by a sol-gel infilitration method that has a changing processing condition, such as the repetitions of infilitration. In order to investigate the relationship between the processing condition and the mechanical properties of composites, the mechanical properties of specimens were measured by means of a 4-point flexural strength test while the evidence of strength degradation were microstructurally characterized. There seemed to be a minimum density value that existed at which the delamination between the fabrics would not occur. In the case that the density of silica CFCCs exceeded 1.55 g/cm3, the flexural strength also exceeded approximately 18 MPa at least. By applying the Minimum Solid Area (MSA) analysis of the porous structure, the correlation between the relative density and the mechanical properties of composites will be discussed.

Keywords:silica;continuous fiber-reinforced ceramic.matrix composites (CFCCs);mechanical properties;Minimum solid area analysis

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