Interfacial Shear Strength Measurements of SiC Fiber-Reinforced Titanium Composites
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Brittleness
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The interfacial strength of SiC/SiC composites fabricated by hot-pressing (HP) and chemical vapor infiltration (CVI) method was measured by push-in test, and the effect of interfacial strength on the fracture behavior of SiC/SiC composites was investigated. Maximum strength and fracture energy of the CVI-SiC/SiC composite was higher than those of the HP-SiC/SiC composite due to lower interfacial shear sliding strength and higher fiber strength. The SiC/SiC composite hot-pressed at 1750 °C had a higher interfacial shear sliding strength and lower fiber strength, resulting in low maximum strength and fracture energy. The SiC/SiC composite hot-pressed at 1650 °C showed a lower maximum strength and higher fracture energy in spite of a lower interfacial shear sliding strength and higher fiber strength. In this case, the delamination between fiber and the matrix occurs easily.
Chemical vapor infiltration
Shear Strength
Hot pressing
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Ceramic matrix composite
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The purpose of this study is to investigate the relationship between its microstructure and bending strength of SiC-C/C (carbon-carbon) composites. By using the phenolic resin and carbon fiber bundle, the carbon fiber reinforced plastics (CFRP) precursor was prepared by employing filament winding technique. To modify the phenolic resin, the micro-sized glass fiber was added. The CFRP precursor was charred at high temperature at Argon atmosphere to obtain SiC-C/C composites. The matrix of composites was densified by resin impregnation done by cold isostatic pressing (CIP) method. The detail observation of matrix after charred revealed that when precursor resin was modified with glass fiber, the direction of thermal crack at matrix showed complex manner, while thermal crack at un-modified matrix only appeared along fiber direction. Because of the presence of complex thermal crack, the matrix of SiC-C/C composite showed high porosity at un-densified condition and effectively densified by CIP to promoting resin flow toward thermal crack. The bending and compression test results showed that bending strength and inter-laminar shear strength of SiC-C/C composites was increased by densification. Moreover, the fractured surface observations suggested that the presence of synthesized SiC nano-whisker at inter-laminar enhances the apparent shear strength due to mechanical bridging between laminar.
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The effect of electroless nickel coating on the interfacial shear strengths of silicon carbide continuous fiber reinforced AA 7075 aluminum matrix composites was investigated using a push-out method with a tungsten carbide (WC) cone indenter. During indentation, no rupture of fibers was observed. This showed that the push-out test can measure the interfacial shear strength of precisely. The 160 MPa interfacial shear strength of the specimen without coating decreases to 120 MPa for the specimen with 0.5 μm nickel coating, even to 20 MPa with 0.8 μm nickel coating, and then slightly increases with increasing coating film thickness. Nickel film reacted with aluminum matrix to form porous nickel aluminide intermetallic compounds during processing and to lower the interfacial shear strength. © 2002 The Electrochemical Society. All rights reserved.
Tungsten Carbide
Nickel aluminide
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The influence of fiber/matrix interface microstructure and interfacial shear strength on the mechanical properties of a fiber-reinforced ceramic composite was evaluated. The composite consisted of approximately 30 vol percent uniaxially aligned 142 microns diameter SiC fibers (Textron SCS-6) in a reaction-bonded Si3N4 matrix (SiC/RBSN). The interface microstructure was varied by controlling the composite fabrication conditions and by heat treating the composite in an oxidizing environment. Interfacial shear strength was determined by the matrix crack spacing method. The results of microstructural examination indicate that the carbon-rich coating provided with the as-produced SiC fibers was stable in composites fabricated at 1200 C in a nitrogen or in a nitrogen plus 4 percent hydrogen mixture for 40 hr. However this coating degraded in composites fabricated at 1350 C in N2 + 4 percent H2 for 40 and 72 hr and also in composites heat treated in an oxidizing environment at 600 C for 100 hr after fabrication at 1200 C in a nitrogen. It was determined that degradation occurred by carbon removal which in turn had a strong influence on interfacial shear strength and other mechanical properties. Specifically, as the carbon coating was removed, the composite interfacial shear strength, primary elastic modulus, first matrix cracking stress, and ultimate tensile strength decreased, but the first matrix cracking strain remained nearly the same.
Ceramic matrix composite
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Fiber-matrix interfacial shear stress and mechanical properties in oxide-matrix composites uniaxially reinforced with either uncoated or coated silicon carbide filaments were measured in the as-fabricated state, and following a thermal treatment at 1300°C for 100 h. All the tested composites showed higher fiber-matrix interfacial debond stress than the frictional stress, and toughened-composite behavior. Mechanical properties of composites reinforced with uncoated filaments were unaffected by an annealing treatment at 1300°C for 100 h. In contrast, an identical annealing treatment given to a composite reinforced with coated filaments led to a decrease in first matrix cracking stress and ultimate strength. These observations were related to the changes in the measured interfacial shear stress values as a result of the annealing treatment.
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Sialon
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This chapter contains sections titled: Introduction Experimental Results and Discussion Summary Acknowledgement
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