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 article, the sintering and grain growth behavior of alumina + 2, 3.5 and 5 wt.% carbon nanotubes (CNTs) and alumina+ 2,3.5, and 5wt.%.
113 citations
01 Jun 1995-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the authors describe the mechanical properties of partially dense materials produced from powders to show that a porous matrix can be strong and demonstrate that the packing density of particles around fibers is highest when the particle-to-fiber diameter ratio is small.
Abstract: Damage-tolerant, continuous fiber ceramic matrix composites have been produced by an inexpensive method. According to this method, the space between the fibers is filled with a powder. The powder particles are heat treated to form a porous framework without shrinkage, which is then strengthened with an inorganic synthesized from a precursor. High particle packing densities can be achieved within the fiber preform provided that the particle-to-fiber diameter ratio is small. Filling the interstices with a powder increased the composite density and also limits the size of the crack-like voids within the matrix. In this review we describe the mechanical properties of partially dense materials produced from powders to show that a porous matrix can be strong. We demonstrate that the packing density of particles around fibers is highest when the particle-to-fiber diameter ratio is small. The kinetics and mechanical behavior of composite systems is summarized to demonstrate the requirements of damage-tolerant properties. An all-oxide ceramic matrix composite produced by this method is discussed.
113 citations
TL;DR: In this paper, an ultra-high-temperature HfB 2 -SiC composite was successfully fabricated by reactive hot-pressing, which consisted of faceted diboride grains (mean size 3μm), with HfC (6vol%) and SiC (22vol%) evenly distributed intergranularly.
112 citations
TL;DR: In this paper, three concentric ring regions with different coatings appeared on the surface of the ablated C/C-ZrC-SiC composites: (i) brim ablation region covered by a coating with layered structure including SiO 2 outer layer and ZrO 2 -SiO 2 inner layer; (ii) transition and center ablation regions with molten Zr O 2 coating.
112 citations
TL;DR: In this article, a reaction of a 2ZrH2:1B4C:1Si molar mixture of ZrB2, SiC, ZrO2 and ZrC was studied using two processes, powder reactions at temperatures from 1150 to 1400°C and reactive hot pressing between 1600 and 1900°C.
Abstract: ZrB2–SiC ceramics with relative densities >99% were fabricated by ‘in situ’ reactive hot pressing from ZrH2, B4C and Si. The reaction was studied using two processes, (1) powder reactions at temperatures from 1150 to 1400 °C and (2) reactive hot pressing between 1600 and 1900 °C. The products from the reaction of a 2ZrH2:1B4C:1Si molar mixture were ZrB2, SiC, ZrO2 and ZrC. Modification of the composition to 2ZrH2:1.07B4C:1.16Si resulted in the elimination of the undesired ZrO2 and ZrC phases. The final composition was approximately ZrB2–27 vol% SiC with no undesired phases detected by X-ray diffraction, and only low concentrations of B4C detected by scanning electron microscopy. Elimination of the undesired phases was accomplished by removing surface oxides through chemical reactions at elevated temperatures. Reactively hot pressed samples consisting of ZrB2 with 27 vol% SiC had a Young's modulus of 508 GPa, a flexure strength of 720 MPa, a fracture toughness of 3.5 MPa m1/2 and a Vickers’ hardness of 22.8 GPa.
112 citations