Effect of heat treatment on microstructure and tensile strength of KD-II SiC fibers in argon and oxidation atmosphere
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The polycarbosilane derived KD-II SiC fibers were heat treated in argon atmosphere at temperatures from 1000 °C to 1800°C and in oxidation atmosphere at temperatures from 1000 °C to 1500 °C for 1 hour, respectively. The effect of heat treatmenton microstructure of all fibers were characterized by X-ray diffraction, scanning electron microscopy, transmission electronmicroscopy, X-ray photoelectron spectroscopy and Atomic Force Microscopeand, and the tensile strength of fibers wereevaluated by monofilament tensile test and Weibull model. The results reveal that the fibers of heat treatment in argonatmosphere can maintain their original tensile strength (~2.5 GPa) up to the temperature at 1200 °C. After that, their tensilestrength starts to decline, especially when the temperature exceeds 1400 °C a sharp strength degradation is observed. Throughdetailed characterization, we find that the reasons for the strength degradation of fibers heat treatment in argon atmosphereinclude the appearance of surface defects, growth of β-SiC grains and decomposition of SiCxOy amorphous phase. Correspondingly, the fibers heat treated in oxidation atmosphere have lower tensile strength compared with those fibers heattreatment in argon atmosphere at the same temperature. Furthermore, their tensile strength starts to degenerate at 1000 °C,and only 30% of original strength is retained when the temperature reached 1500 °C. Obviously, for fibers heat treatment inoxidation atmosphere, their tensile strength degradation starting temperature is lower and degradation speed is faster thanthose fibers heat treatment in argon atmosphere. This can be attributed to the interface stress existed between silica layer withinternal fibers, the surface cracks caused by the thermal stress and the growth of β-SiC grains.
Abstract
The polycarbosilane derived KD-II SiC fibers were heat treated in argon atmosphere at temperatures from 1000 °C to 1800°C and in oxidation atmosphere at temperatures from 1000 °C to 1500 °C for 1 hour, respectively. The effect of heat treatmenton microstructure of all fibers were characterized by X-ray diffraction, scanning electron microscopy, transmission electronmicroscopy, X-ray photoelectron spectroscopy and Atomic Force Microscopeand, and the tensile strength of fibers wereevaluated by monofilament tensile test and Weibull model. The results reveal that the fibers of heat treatment in argonatmosphere can maintain their original tensile strength (~2.5 GPa) up to the temperature at 1200 °C. After that, their tensilestrength starts to decline, especially when the temperature exceeds 1400 °C a sharp strength degradation is observed. Throughdetailed characterization, we find that the reasons for the strength degradation of fibers heat treatment in argon atmosphereinclude the appearance of surface defects, growth of β-SiC grains and decomposition of SiCxOy amorphous phase. Correspondingly, the fibers heat treated in oxidation atmosphere have lower tensile strength compared with those fibers heattreatment in argon atmosphere at the same temperature. Furthermore, their tensile strength starts to degenerate at 1000 °C,and only 30% of original strength is retained when the temperature reached 1500 °C. Obviously, for fibers heat treatment inoxidation atmosphere, their tensile strength degradation starting temperature is lower and degradation speed is faster thanthose fibers heat treatment in argon atmosphere. This can be attributed to the interface stress existed between silica layer withinternal fibers, the surface cracks caused by the thermal stress and the growth of β-SiC grains.
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