Topic
Ceramic matrix composite
About: Ceramic matrix composite is a research topic. Over the lifetime, 7807 publications have been published within this topic receiving 117020 citations.
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TL;DR: In this paper, a composite layer of silicon and hafnium oxide (Si-HfO2) is proposed to provide a well-bonded interface between silicon and the substrate, similar to the pure metallic silicon bond coat, but with a higher temperature capability owing to the addition of HfO 2.
Abstract: Current state of the art (SOA) environmental barrier coating (EBCs) systems necessary for SiC/SiC ceramic matrix composites (CMCs) rely upon a metallic silicon bond coat. While this layer provides durability and adhesion, the upper use temperature of these systems is limited by the melting point of silicon (1414 °C). Turbine engine temperatures already exceed this melting point and in order to reduce or eliminate cooling for advanced components, new bond coat materials are required for EBC systems. One potential EBC bond coat that has been proposed is a composite layer of silicon and hafnium oxide (Si-HfO2). This coating concept intends to provide a well-bonded interface between silicon and the substrate, similar to the ‘pure’ metallic silicon bond coat, but with a higher temperature capability owed to the addition of HfO2. Two-layer systems of Si-HfO2 bond coat and a Yb2Si2O7 EBC top coat were deposited using Plasma Spray- Physical Vapor Deposition (PS-PVD), which is a hybrid coating method technique capable of vapor or liquid deposition. Coatings were deposited on bulk α-SiC and tested for oxidation performance in both laboratory air and in 90%/10% H2O/O2. A thermally grown oxide (TGO) of SiO2 was formed at the substrate/bond coat interface and the growth of this layer was measured and compared to literature values to determine TGO growth rates.
59 citations
TL;DR: In this paper, the reinforcement mechanism was discussed based on the microstructure investigation, and the broken nanotubes and pullout of carbon nanotsubes at interfaces are efficient in transferring the load from the mullite matrix to the carbon-nanotubes, leading to an improvement of the mechanical properties.
59 citations
TL;DR: In this paper, SiC ceramic matrix composites reinforced by 2.5-dimensional carbon fibers were prepared by low-pressure chemical vapor infiltration and the ablation performance of the composites was characterized by an oxyacetylene torch.
59 citations
TL;DR: In this article, the authors developed a methodology for linking in situ detection of localized damage to final failure in continuous fiber reinforced CMCs and measured and located linearly along the gage length via acoustic emission (AE) detection.
59 citations
TL;DR: In this paper, an approach to the nonlinear stress-strain behavior of ceramic matrix composites was proposed, based upon damage mechanics, and a two-stage damage mechanism was identified by optical microscopy on specimens under load.
Abstract: An approach to the nonlinear stress–strain behavior of ceramic matrix composites was proposed, based upon damage mechanics. Damage–loading relations taking into account effects of anisotropy and coupling were established. These relations allowed prediction of the stress–strain behavior, and ultimate failure. The theory was then applied to a 2D SiC/SiC composite subject to tensile loading under 0°, 20°, and 45° off-axis angles. A two-stage damage mechanism was identified by optical microscopy on specimens under load. Predictions of the stress–strain behavior were in excellent agreement with experimental data.
59 citations