1. Effect of Interface Coating on High Temperature Mechanical Properties of SiC–SiC Composite Using Domestic Hi–Nicalon Type SiC Fibers
- Author
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Hongrui Liu, Zhihai Feng, Denghao Ma, Sun Xin, Li Junping, Kun Wu, Jin Enze, Wenting Sun, and Yuan Zeshuai
- Subjects
Materials science ,fiber–matrix interface coatings ,high temperature strength ,Composite number ,residual stress ,Surfaces and Interfaces ,engineering.material ,Ceramic matrix composite ,Surfaces, Coatings and Films ,Brittleness ,ceramic matrix composite ,Coating ,lcsh:TA1-2040 ,Residual stress ,Ultimate tensile strength ,Materials Chemistry ,engineering ,Fracture (geology) ,sense organs ,Fiber ,SiC fiber ,Composite material ,lcsh:Engineering (General). Civil engineering (General) - Abstract
Here we show that when the temperature exceeded 1200 °, C, the tensile strength drops sharply with change of fracture mode from fiber pull-out to fiber-break. Theoretical analysis indicates that the reduction of tensile strength and change of fracture mode is due to the variation of residual radial stress on the fiber&ndash, matrix interface coating. When the temperature exceeds the preparation temperature of the composites, the residual radial stress on the fiber&ndash, matrix interface coating changes from tensile to compressive, leading to the increase of the interface strength with increasing temperature. The fracture behavior of SiC&ndash, SiC composites changes from ductile to brittle when the strength of fiber&ndash, matrix interface coating exceeds the critical value. Theoretical analysis predicts that the high temperature tensile strength can increase with a decrease in fiber&ndash, matrix interface thickness, which is verified by experiments.
- Published
- 2020
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