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, the formation of zirconia deposits found in the center of the convection cells is proposed as the consequence of liquid transport, using calculated phase equilibrium diagrams and microstructure observations of a ZrB2-15 vol% SiC composite tested at 1550° and 1700°C in ambient air.
Abstract: During high-temperature oxidation of ZrB2–SiC composites, a multi-layer oxide scale forms with a silica-rich borosilicate liquid as the surface oxide layer. Here, a recently proposed novel mechanism for the high-temperature oxidation of ZrB2–SiC composites is further investigated and verified. This mechanism involves the formation of convection cells in the oxide surface layer during high-temperature oxidation of the composite. The formation of zirconia deposits found in the center of the convection cells is proposed here to be the consequence of liquid transport. The nature and deposition mechanism of the zirconia is reported in detail, using calculated phase equilibrium diagrams and microstructure observations of a ZrB2-15 vol% SiC composite tested at 1550° and 1700°C in ambient air for various times. The calculated phase equilibrium diagrams for the binary ZrO2–B2O3 system as well as the ternary B2O3–SiO2–ZrO2 system at 1500°C are reported here to interpret these results.
84 citations
TL;DR: In this paper, a unified multiscale approach to modeling of the CMC behavior at different scales: micro-, meso- and macro-scale is presented by numerical examples for two-phase composite made of alumina and zirconia with different volume contents.
84 citations
Patent•
06 Mar 1986
TL;DR: In this paper, a set of cutting tools are described, which are comprised of composite bodies comprising a ceramic matrix reinforced by ceramic whiskers, and the ceramic matrix may be alumina or silicon nitride, and may contain toughening components.
Abstract: Cutting tools are disclosed which are comprised of composite bodies comprising a ceramic matrix reinforced by ceramic whiskers. The ceramic matrix may be alumina or silicon nitride, and may contain toughening components. The whiskers are preferably silicon carbide, but may be other known ceramic whiskers. Whisker content in the composite is 2-40%, with higher contents generally used for tools when the expected service involves interrupted cutting and lower contents generally used for continuous cutting tools.
84 citations
TL;DR: In this paper, the authors present an overview of recent research performed at Rutgers University and the University of Connecticut on the synthesis and processing of nanostructured materials and demonstrate superior hardness and wear resistance in bulk materials and coatings.
84 citations
TL;DR: In this article, analytical solutions of and experimental results on the oxidation kinetics of carbon in a pore are presented, with an overall linear-parabolic rate relationship between reaction rate, reaction sequence, oxidant partial pressure, total system pressure, pore/crack dimensions, and temperature.
Abstract: Analytical solutions of and experimental results on the oxidation kinetics of carbon in a pore are presented. Reaction rate, reaction sequence, oxidant partial pressure, total system pressure, pore/crack dimensions, and temperature are analyzed with respect to the influence of each on an overall linear-parabolic rate relationship. Direct measurement of carbon recession is performed using two microcomposite model systems oxidized in the temperature range of 700 to 1200 C, and for times to 35 h. Experimental results are evaluated using the derived analytical solutions. Implications on the oxidation resistance of continuous-fiber-reinforced ceramic-matrix composites containing a carbon constituent are discussed.
83 citations