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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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01 Jan 1998
303 citations
TL;DR: In this article, four types of interphase are depicted involving weak interfaces, materials with a layered crystal structure (pyrocarbon, BN, micas and phyllosiloxides, or materials with the β-alumina/magnetoplumbite structures), multilayers such as (PyC-SiCn or (BN-SiCsn)n or, finally, porous materials.
Abstract: Ceramic matrix composites are tough when the fibre-matrix bonding is properly controlled during processing, via the use of an interphase. The interphase is either formed in situ as the result of fibre-matrix interactions or deposited on the fibre surface prior to composite fabrication. It has several key functions, including crack deflection, load transfer, diffusion barrier and residual stress relaxation. Four types of interphase are depicted involving weak interfaces, materials with a layered crystal structure (pyrocarbon, BN, micas and phyllosiloxides, or materials with the β-alumina/magnetoplumbite structures), multilayers such as (PyC-SiC)n or (BN-SiC)n or, finally, porous materials. Achieving high mechanical properties and long lifetimes in severe environments require a subtle design of the fibre-matrix interfacial zone, which is depicted for Nicalon/glass–ceramic and Nicalon/SiC-matrix composites.
297 citations
TL;DR: In this article, the processing and properties of HfB2-20 vol%SiC ultra high temperature ceramics were examined and it was concluded that passive oxidation of SiC plays a role in determining the steady-state surface temperatures below 1700°C.
Abstract: The processing and properties of HfB2-20 vol%SiC ultra high temperature ceramics were examined. Dense billets were fabricated by hot-pressing raw powders in a graphite element furnace for 1 h at 2200°C. Specimens were then tested for hardness, mechanical strength, thermal properties and oxidation resistance in a simulated re-entry environment. Thermal conductivity of the current materials was found to be less than previous work had determined while the strength was greater. Oxidation testing of two flat-face models was conducted, at two conditions, for two 10-min durations each. It was concluded that passive oxidation of SiC plays a role in determining the steady-state surface temperatures below 1700°C. Above 1700°C, temperatures are controlled by the properties of a thick HfO2 layer and active oxidation of the SiC phase.
296 citations
TL;DR: In this paper, a review identifies the requirements of an effective oxidation protection system for carbon fiber-reinforced ceramics and summarizes the work which has been carried out towards this goal over the last 50 years.
Abstract: Carbon fibre-reinforced ceramic matrix composites are promising candidate materials for high-temperature structural applications such as gas turbine blades. In oxidizing environments at temperatures above 400°C, however, carbon fibres are rapidly oxidized. There is, therefore, a need to coat the composite in order to protect it against oxidation. This review identifies the requirements of an effective oxidation protection system for carbon fibre-reinforced ceramics and summarizes the work which has been carried out towards this goal over the last 50 years. The most promising coatings are those composed of several ceramic layers designed to protect against erosion, spallation and corrosion, in addition to possessing a self-healing capability by the formation of glassy phases on exposure to oxygen.
283 citations
281 citations