Sapphire reinforced alumina matrix composites

Cover of: Sapphire reinforced alumina matrix composites |

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C, Springfield, Va .

Written in English

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  • Zirconium oxides.,
  • Fiber pullout.,
  • Heat treatment.,
  • Hot pressing.,
  • Mechanical properties.,
  • Reinforcing fibers.,
  • Tensile tests.,
  • Sapphire.,
  • Fiber composites.

Edition Notes

Book details

StatementMartha H. Jaskowiak, John A. Setlock.
SeriesNASA-TM -- 111693., NASA technical memorandum -- 111693.
ContributionsSetlock, John A., United States. National Aeronautics and Space Administration.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL15498253M

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Special attention was paid to the structural characterization at the micro- and nanoscale, as uniform nanoparticle dispersion in metal matrix is of prime importance. The aluminum nanocomposites displayed an ultrafine microstructure reinforced with alumina. Get this from a library.

Sapphire Sapphire reinforced alumina matrix composites book alumina matrix composites. [Martha H Jaskowiak; John A Setlock; United States. National Aeronautics and Space Administration.]. Zirconia coated sapphire reinforced alumina matrix composites have been tested both after heat treatment to °C and at temperatures ranging from °C to °C in air.

Inteffacial shear stress has also been measured with fiber pushout tests performed in air at room temperature, °C and °C. Matrix crack spacing was measured for the tensile tested composites and used to.

Unidirectionally reinforced A matrix composites have been fabricated by hot pressing. Approximately 30 volume % of either coated or uncoated sapphire fiber was used as reinforcement.

Unstabilized ZrO2 was applied as the fiber coating. Composite mechanical behavior was analyzed both after fabrication and after additional heat treatment. The results of composite tensile tests were. Sapphire reinforced alumina matrix composites. By John A. Setlock and Martha H.

Jaskowiak. Abstract. Unidirectionally reinforced A matrix composites have been fabricated by hot pressing. Approximately 30 volume % of either coated or uncoated sapphire fiber was used as reinforcement.

Unstabilized ZrO2 was applied Sapphire reinforced alumina matrix composites book the fiber : John A. Setlock and Martha H. Jaskowiak. Request PDF | Sapphire-fiber reinforced RBAO | Pure oxide ceramic composites, e.g., alumina / alumina offer a great potential as materials for high temperature applications and use in oxidizing.

To assess such a far‐reaching technology, unidirectional and cross‐ply alumina single crystal fiber‐reinforced alumina composites were processed. Several interfacial design concepts were demonstrated by coating the fibers with carbon and zirconia either mixed or as a double coating.

The coefficient of friction of the aluminum alloy (Al12SiCuNiMg) matrix heterophase composite containing wt% of particulate Al 2 O 3 with the particle size of 50 μm (~”) and 5-wt% of glass carbon particles is lower by 20% than that of the composite reinforced with 30% of alumina only [2].

Many previous studies have focused on the fabrication and properties of alumina fiber-reinforced alumina matrix composites [, ].

Unfortunately, a commonly high porosity (25–30 %) of the alumina matrix results in low composite strengths (composites generally suffer a substantial strength loss due to grain coarsening at relatively high temperatures (> °C) [ 16 ].

Properties of the fiber/matrix interface in monoclinic ZrO 2-coated alumina fiber-reinforced composites were investigated using model composites with dense alumina matrix and single alumina fiber-matrix porous interface was produced via dip-coating single fibers in monoclinic ZrO 2 suspensions and two different particle sizes were used in order to vary the coating porosity.

increase matrix density while maintaining a weak fiber/matrix interface in a sapphire-reinforced alumina matrix composite. The reaction formation of alumina led to an extremely fine grain size in the matrix that increased the sinterability and strength of the final ceramic.

Without aluminum additions, the matrix density was approximately During the ultrasonic-assisted brazing, the aluminum matrix in the precursor layer was mixed with the Zn-Al alloy. The rise of the Al content in the joints resulted from the dissolution procedure. Microstructure of the interface between the SiCp/Zn-Al composite and sapphire substrate is shown in the Fig.

Cracks at the sapphire/alloy interface were not found, indicating a robust bonding. Alumina matrix composites are composed of alumina, which represents 82% of the volume of the overall material. Nanoparticles of zirconium oxide (zirconia) are added to the alumina matrix and represent 17% of the volume (Cavalcanti et al., ).These particles are stabilized in the tetragonal phase, since it provides the best mechanical performance.

The current interest in tough, high-temperature materials has motivated fiber coating development for sapphire fiber-reinforced alumina composites. For this system, it has been demonstrated that the interfacial properties can be controlled with coatings which can be eliminated from the interface subsequent to composite consilidation.

Zirconia coated sapphire reinforced alumina matrix composites have been tested both after heat treatment to C and at temperatures ranging from C to. Abstract. An investigation of fabrication technology on eutectic composites consisting of Al 2 O 3 phases and YAG (Y 3 Al 5 O 12) phases was carried out by applying the unidirectional solidification ectionally solidified eutectic composites consisting of 〈〉 sapphire phases and 〈〉 single crystal YAG phases could be fabricated successfully by lowering a Mo crucible at.

This volume is part of the Ceramic Engineering and Science Proceeding (CESP) series. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics.

The present chapter discusses the integration of carbon nanotube reinforced aluminum matrix composites for the application of the automotive brake drum. Generally, aluminum matrix composite is a technique enabling to tailor the desired properties to suit the appropriate application.

Abstract. A review of various properties of ceramic-reinforced aluminium matrix composites is presented in this paper. The properties discussed include microstructural, optical, physical and mechanical behaviour of ceramic-reinforced aluminium matrix composites and effects of reinforcement fraction, particle size, heat treatment and extrusion process on these properties.

In all cases the YAG‐containing composites gave higher ultimate stresses and greater strains to failure than the all‐alumina composites when processed at ° C. Composite strength of the alumina‐YAG matrix composites was likely increased by minimizing either fiber degradation or matrix densification.

alumina matrix reinforced with single crystal alumina fibers. The choice of composite materials was initially governed by fiber availability.

Sapphire fibers were considered the optimum candidate in terms of microstructural stability, oxidation and creep resistance, and strength retention. Polycrystalline alumina was then chosen as the matrix material in. Zirconia toughened alumina particles (ZTAp), both spherical (s-ZTAp) and irregular (i-ZTAp), reinforced iron (Fe45) matrix composites were fabricated by vacuum sintering.

The influence of ZTAp size, shape and content in the microstructure and properties was investigated as well. Measurement of Interfacial Micromechanics in Fibre Reinforced Ceramic Matrix Composites (Pages: ) A.

Daniel Time‐Dependent Strength Degradation and Reliability of an Alumina Ceramic Subjected to Biaxial Flexure (Pages: ) Effects of Varying PO 2 on Subcritical Crack Growth in Continuous‐Fiber Reinforced Ceramic. Results for two whisker reinforced ceramic matrix composites and for quartz particles in porcelain are discussed.

It is concluded that the stresses which develop in the second phase reinforcing inclusions are quite substantial (GPa-levels) and may be highly anisotropic in character. Alumina/zirconia matrix composites with platinum-coated sapphire fibers were fabricated using the technology of reaction bonding of aluminum oxide (RBAO) as the synthesis route.

Aluminium metal matrix composites - a review 57 coated carbide cutting tool, high cutting speed and low feed rate produces better surface finish. Natarajan [17] has compared the wear behaviour of A/25SiC MMC with the conventional grey Cast iron sliding against automobile friction material.

It has been found that the wear resistance of the com. Thermomechanical Fatigue of Ceramic-Matrix Composites is an excellent book for developers and users of CMCs, as well as organizations involved in evaluation and characterization of CMCs. It will appeal to materials scientists, construction.

In general, metal-matrix composites (MMCs) are classified into three broad categories: continuous fiber-reinforced composites, discontinuous or short fiber-reinforced composites, and particle-reinforced composites. This article focuses on stir casting and melt infiltration as the two main methods of MMC solidification processing.

Su Hai., Gao Wenli., Feng Zhaohui. and Lu Zheng. Processing, microstructure and tensile properties of nano-sized Al 2 O 3 particle reinforced aluminum matrix composites Materials and Design. 36 Crossref Google Scholar. Metal Matrix Cast Composites, Inc., Waltham, Massachusetts Fracture Analysis of Particulate Reinforced Metal Matrix Composites NASA/TM— May National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio Ch.

4—Metal Matrix Composites Photo credit: DWA Composite Specialties, Inc. Micrograph (75x magnification) of 20 percent volume fraction silicon carbide particulate-reinforced aluminum.

Discontinuous Reinforcement There are two types of discontinuous reinforce-ment for MMCs: particulate and whiskers. The. The current interest in tough, high‐temperature materials has motivated fiber coating development for brittle‐matrix composites with brittle reinforcements. Such coatings are needed for controlled interface debonding and frictional sliding.

The system investigated in this study was sapphire fiber‐reinforced alumina. This paper is concerned with the fabrication and evaluation of composites of pure aluminum reinforced with sapphire wool type whiskers. The composites were prepared by initially coating the as-grown whiskers with a duplex coating of nickel and titanium utilizing a sputtering technique, orienting the coated whisker bundle, and infiltrating the bundle with liquid aluminum.

Metal matrix composites were prepared by stir casting route. The composite was prepared by reinforcing 50 nm alumina nanoparticle so that the final composite contains 5, 10 and 15 wt.% alumina. Mechanical properties such as tensile strength, yield strength, impact strength and. 00 CERAMIC MATRIX COMPOSITES AS ARMOR MATERIALS D.

Ray Johnson P. Morgan The inclusion of single crystal sapphire fibers in the spinel matrix resulted in a higher ultimate tensile strength than that of the unreinforced spinel ceramic. small samples of nichrome wire reinforced alumina and spinel by pressure calcintering, to.

Composite Materials, Volume 4: Metallic Matrix Components provides an in-depth report and a reference on the technology of metal-matrix composites. The book starts by giving an introduction to metal-matrix composites, and by discussing the principal metal-laminate fabrication methods, the properties of metal laminates, and materials engineering.

materials. Composite Engineering Materials Review. Manufacturing Knowledge Menu. A composite is a material consisting of two (or more) different materials bonded together, one forming a ‘matrix' in which are embedded fibers or particles that increase the strength and stiffness of the matrix material.

A sol-gel derived alumina matrix composite produced by COI Ceramics that is reinforced with Nextel (3M Company) fibers. Toughening Behavior in Whisker‐Reinforced Ceramic Matrix Composites This is quite evident if one compares the dK"' values obtained at V, = for the niullite versus alumina matrix com- posites (Fig.

4) and the matrix. Alumina reinforced tetragonal zirconia (TZP) composites. [Annual report, Febru Febru ]. A six months feasibility study of these and other composites is reviewed. Microstructural examination shows no degradation of the wire reinforcement or the matrix materials during fabrication.

Sapphire fibers and whiskers did not significantly enhance the properties of the spinel and alumina matrices; the sapphire whiskers were dissolved in the. Effect of Composition, Particle Size, and Heat Treatment on the Mechanical Properties of Al wt.% Cu Based Alumina Particulate Reinforced Composites The quest for higher efficiency and performance of automotive vehicles requires application of materials with high strength, stiffness and lower weight in their construction.Ceramic matrix composites (CMCs) are a subgroup of composite materials as well as a subgroup of consist of ceramic fibres embedded in a ceramic matrix.

The matrix and fibres can consist of any ceramic material, whereby carbon and carbon .Materials science - Materials science - Ceramics: Ceramics play an important role in engine efficiency and pollution abatement in automobiles and trucks.

For example, one type of ceramic, cordierite (a magnesium aluminosilicate), is used as a substrate and support for catalysts in catalytic converters. It was chosen for this purpose because, along with many ceramics, it is lightweight, can.

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