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Oxide Composites (oxide + composite)

Distribution by Scientific Domains
Polymers and Materials Science100%

Selected Abstracts

A Tin-Based Amorphous Oxide Composite with a Porous, Spherical, Multideck-Cage Morphology as a Highly Reversible Anode Material for Lithium-Ion Batteries

ADVANCED MATERIALS, Issue 35 2009
Yan Yu
No abstract is available for this article. [source]

A Tin-Based Amorphous Oxide Composite with a Porous, Spherical, Multideck-Cage Morphology as a Highly Reversible Anode Material for Lithium-Ion Batteries,

ADVANCED MATERIALS, Issue 7 2007
Y. Yu
Thin-film anodes for Li-ion batteries prepared by using electrostatic spray deposition are reported. They consist of a tin-based amorphous oxide composite with a porous, spherical, multideck-cage morphology (see figure). The electrochemical properties of the thin-film electrodes are shown to be improved significantly by introducing Li2O and CuO, the ternary Li2O,CuO,SnO2 electrode being demonstrated to exhibit the best performance. [source]

Developments in Oxide Fiber Composites

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 11 2006
Frank W. Zok
Prospects for revolutionary design of future power generation systems are contingent on the development of durable high-performance ceramic composites. With recent discoveries in materials and manufacturing concepts, composites with all-oxide constituents have emerged as leading candidates, especially for components requiring a long service life in oxidizing environments. Their insertion into engineering systems is imminent. The intent of this article is to present a synopsis of the current understanding of oxide composites as well as to identify outstanding issues that require resolution for successful implementation. Emphasis is directed toward material systems and microstructural concepts that lead to high toughness and long-term durability. These include: the emergence of La monazite and related compounds as fiber-coating materials, the introduction of the porous-matrix concept as an alternative to fiber coatings, and novel strategies for enabling damage tolerance while retaining long-term morphological stability. Additionally, materials and mechanics models that provide insights into material design, morphology evolution, and composite properties are reviewed. [source]

Mullite/Alumina Mixtures for Use as Porous Matrices in Oxide Fiber Composites

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 2 2004
Hiroki Fujita
Weakly bonded particle mixtures of mullite and alumina are assessed as candidate matrixes for use in porous matrix ceramic composites. Conditions for the deflection of a matrix crack at a fiber-matrix interface are used to identify the combinations of modulus and toughness of the fibers and the matrix for which damage-tolerant behavior is expected to occur in the composite. Accordingly, the present study focuses on the modulus and toughness of the particle mixtures, as well as the changes in these properties following aging at elevated temperature comparable to the targeted upper-use temperature for oxide composites. Models based on bonded particle aggregates are presented, assessed, and calibrated. The experimental and modeling results are combined to predict the critical aging times at which damage tolerance is lost because of sintering at the particle junctions and the associated changes in mechanical properties. For an aging temperature of 1200°C, the critical time exceeds 10 000 h for the mullite-rich mixtures. [source]

The combustion behavior of polyacrylate ester/graphite oxide composites,

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 4 2006
Jianqi Wang
Abstract There is an increasing interest in polymer layered silicate nanocomposites, due to the enhanced properties of these systems. An additional layered system is the graphite oxide system and this has been studied as polyacrylate ester nanocomposites. These have been characterized using X-ray diffraction and a variety of fire tests. There is a significant change in the oxygen index for nanocomposites which is absent for microcomposites, unlike the situation for the clay-based systems. X-ray photoelectron spectroscopy showed that the surface was covered with a graphite oxide-like material at high temperatures for the nanocomposites, suggesting that this nano-dimensional material operates as a barrier, exactly as proposed for polymer-clay systems. Copyright © 2006 John Wiley & Sons, Ltd. [source]