Preparation of Lanxide™ Ceramic Matrix Composites: Matrix Formation by the Directed Oxidation of Molten Metals

Newkirk, Matthew S.; Lesher, H. D.; White, D. R.; Kennedy, C. R.; Urquhart, A. W.; Claar, T. D.

doi:10.1002/9780470320402.ch46

Cited by 105 publications

(16 citation statements)

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“…Another process, to form oxide-matrix materials, is the directed-metal oxidation process. 3 The principle objective of the research reported here is to investigate the damage tolerance of textile-reinforced CMCs manufactured by PIP through both single and cyclic loading. Results are compared to unidirectional CMCs composed of ",,15 11m Nicalon fibers manufactured by glass infilt:ration and another group made with 150 11m diameter SCS-6 fibers having a sintered ceramic-powder matrix and that were tested previously.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Ceramic-matrix composites fatigue and fracture

Davidson

1995

JOM

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Fiber-reinforced ceramic-matrix composites (CMCs) have been shown to exhibit excellent high-temperature properties. There are some published data on the mechanical properties of Nicalon fiber-reinforced composites with various matrices, but much of the work was performed in bending, and there is little information on the failure modes in textile-reinforced CMCs, especially under cyclic-loading conditions. This article is an interim report on research that examines the tensile deformation, fracture, smoothbar fatigue, and fatigue crack-growth behavior of several CMCs. Unidirectional, twodimensional eight-harness satin weave, and three-dimensional angle-interlock weave Nicalon fiber architectures infiltrated with polymers and then pyrolized were investigated and are compared with similar experiments on Nicalon-reinforced calcium-silicate glass-ceramic-matrix composites. L-J O.SmmFigure 1. Unidirectional composite showing the delamination, or shear failure, that occurred during the tensile test.

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Section: Mechanical Propertiesmentioning

confidence: 99%

“…This design was used successfully for studying CAS/Nicalon composites. 3 Methods have been found to fabricate specimens in a cost-effective way. The specimen shown in the figure was loaded in a laboratory machine or …”

Section: Fatigue Experimentsmentioning

confidence: 99%

Ceramic-matrix composites fatigue and fracture

Davidson

1995

JOM

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“…By conducting the reaction in the presence of a solid second phase, composites can be fabricated. [63] A very intriguing materials research opportunity lies in mimicking the way living organisms process ceramic composite structures such as bone and shell. Calverf and Broad have used such bio-mimetic processing to produce metal oxide materials.…”

Section: Processing Opportunitiesmentioning

confidence: 99%

Aerospace Materials Research Opportunities

Salkind

1989

Angewandte Chemie

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As we approach the second century of aerospace, increased emphasis is being placed on endurance, reliability, ease of manufacture, and lower cost, in addition to weight saving. This change in emphasis will have a major effect on not only the selection of materials, but on how materials are integrated into the total system design process. Subsonic aircraft will continue to play a major role in our future with emphasis on increased durability and lower cost. Nonmetals that do not corrode are attractive; however, the issues of reliable fracture resistance to ensure safety and durability as well as ease of manufacture and inspection will be key. Higher performance engines and hypersonic aircraft will require higher temperature materials (including a substantial amount of nonmetals) along with reliable toughness and ease of manufacture. In space, weight will continue to be a major driving force along with the need for long term vacuum and radiation stability. Ease of assembly and multifunctional use (e.g. electrically or thermally conducting structure) will be additional needs for spacecraft materials. We have reached a point in the evolution of structural materials where we are moving away from processing naturally occurring materials toward synthesizing designed microstructures to perform specific functions. The mathematical modeling of microstructure-property relationships and new chemical and biotechnical synthesis techniques appear to be critical technologies for the future. In addition, the future materials developer will need a broader understanding of the total structural life cycle so that the impact of utilization, maintenance, and training requirements in the design of new materials can be considered.

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“…The approach followed was based on the acquired technological and scientific knowledge of producing Al 2 O 3 /Al composites via direct oxidation of Al-Mg-Si alloys, widely known as DIMOX TM [8][9][10][11][12]. According to the model of Newkirk et al [13], the structure of polycrystalline Al 2 O 3 /Al composite, which comprises a randomly developed network of micro-channels among the Al 2 O 3 grains, facilitates mass-transfer phenomena of the molten alloy to the surface during production process.…”

Section: Introductionmentioning

confidence: 99%