Papers by Keyword: SiC Fiber

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Authors: Rong Pin Ma, Xu Dong Cheng, Wei Ping Ye
Abstract: In a high-temperature environment, the pyrolytic reaction of the SiC fiber destroyed the chain structure of the fiber and cause fiber apparent weightlessness, the surface and internal of fiber produce porous structure defects. In order to improve high-temperature thermal stability of SiC fiber that the reunion composite powder (CP) of perlite and nanozirconia was prepared by atomized granulation technology, and the CP is sprayed the surface of SiC fiber by plasma spraying technology. The SiC fiber was completely ablation at 1200°C for 3h. On the contrary, the spraying CP of fiber is not affected, showing favorable high-temperature stability. The surface appearance of the fiber was analyzed by means of SEM, and the flame temperature Spray Watch.
Authors: Hiroshi Ichikawa
Abstract: The oxygen free SiC fiber (Hi-Nicalon) has been commercially produced by an electron beam curing process. And then the SiC fiber (Hi-Nicalon Type S) having stoichiometric SiC composition and high crystallinity has been developed. Hi-Nicalon fiber has higher elastic modulus and thermal stability than Nicalon fiber. The Type S fiber has the highest elastic modulus and thermal stability and excellent creep resistance in three types of Nicalon fibers. Recently,Type S fibers as industrial products have been developed and put on the market. The Type S fibers have a high tensile strength of 2.8 GPa, a high elastic modulus of 390 GPa. Against thermal exposure, Type S retains a tensile strength of 2.3 GPa and hardly changes its elastic modulus even at 1873K. Moreover, Type S has outstanding creep resistance. Type S shows higher stress relaxation ratio than many other ceramic fibers after thermal exposure over 1673K. Now, Hi-Nicalon Type S fiber/BN/SiC composites are being developed as the components of gas turbine for aerospace and land based power generation such as shrouds and combustors. Type Hi-Nicalon S can be supplied about 30 kg per a month at present.
Authors: Paolo Deodati, Riccardo Donnini, Saulius Kaciulis, Alessio Mezzi, Roberto Montanari, Claudio Testani, Nadia Ucciardello
Abstract: The composite, consisting of Ti6Al4V matrix reinforced by unidirectional SiC fibres (SCS-6), has been investigated by mechanical spectroscopy at temperatures up to 1,173 K. For comparison, the same experiments have been performed on the corresponding monolithic alloy. The internal friction (IF) spectrum of the composite exhibits a new relaxation peak superimposed to an exponentially increasing background. This peak, which is not present in the monolithic alloy, has an activation energy H = 186 kJ mol-1 and a relaxation time 0 = 2.3 x 10-15 s. The phenomenon has been attributed to a reorientation of interstitial-substitutional pairs in the  phase of Ti6Al4V matrix around the fibres. This explanation is supported by the results of micro-chemical characterization carried out by X-ray photoelectron spectroscopy (XPS) combined with Ar ion sputtering.
Authors: Beate Fankhänel, Eberhard Müller, Torsten Fankhänel, Winfried Siegel
Authors: Satoko Shoji, Yoshiro Katase, Kiyohito Okamura
Authors: H.-P. Martin, Dirk Kurtenbach, Eberhard Müller, Gerhard Roewer
Authors: Kohei Morishita, S. Ochiai, H. Okuda, Toshihiro Ishikawa, M. Sato
Abstract: For description of the mechanical performance of SiC/SiC composites and for safety design for practical use, it is needed to reveal the degradation mechanism especially of fiber under the oxygen atmosphere. In the present work, the fracture behavior and microstructure of the polycrystalline silicon carbide fiber exposed in air at 1173-1873 K for 20 and 3.6 ks were studied with monofilament tensile test, microstructure observation and fracture toughness determination test using newly developed FIB(focused-ion-beam)-method.
Authors: Xin Peng Wang, Shi Tian
Abstract: In this paper, the unidirectional SiC fiber-reinforced aluminum phosphates composites, in which the SiC fibers were heat-treated at different temperature, time and in different method, were prepared. The dielectric and mechanical properties of the composites were studied. The influences of heat treatment of SiC fiber on the properties of the SiC fiber-reinforced aluminum phosphates composite were investigated in detail. The flexural strength, relative dielectric constant and dielectric dissipation factor of the composite were measured. And the microstructure of the composite was characterized by SEM (scanning electronic microscope). The results show that heat treatment of SiC fiber has a great influence on mechanical and dielectric properties of the composite. The heat treatment decreases the dielectric constant and dielectric dissipation factor of the composite enormously. But at the same time, the heat treatment of the SiC fiber makes an unfavorably strongly bonded SiC fiber/aluminum phosphates matrix interface, which decreases the strength of the composite extraordinarily. And the composite displays a completely brittle failure behavior without fiber debonding and pulling out, which is detected by SEM.
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