Advanced composites, joining

Kutscha, D. and Hofer, K. E. (1969) Feasibility of joining advanced composite flight vehicle structures, AD 690 616, FIT Research Inst. 

In any brazing/soldering process, a molten alloy comes in contact with a surface of solid, which may be an alloy, a ceramic, or a composite material (see Ceramics Composite materials). For a molten alloy to advance over the soHd surface a special relationship has to exist between surface energies of the hquid—gas, soHd—gas, and Hquid—soHd interfaces. The same relationships should, in principle, hold in joining processes where a molten alloy has to fill the gaps existing between surfaces of the parts to be joined. In general, the molten alloy should have a lower surface tension than that of the base material. 

Advanced adhesives are composite liquids that can be used, for example, to join aircraft parts, thus avoiding the use of some 30,000 rivets that are heavy, are labor-intensive to install, and pose quality-control problems. Adhesives research has not involved many chemical engineers, but the generic problems include surface science, polymer rheology and thermodynamics, and molecular modeling of materials... 

Debra Rolison (right) was born in Sioux City, Iowa in 1954. She received a B.S. in Chemistry from Florida Atlantic University in 1975 and a Ph.D. in Chemistry from the University of North Carolina at Chapel Hill in 1980 under the direction of Prof. Royce W. Murray. She joined the Naval Research Laboratory as a research chemist in 1980 and currently heads the Advanced Electrochemical Materials section. She is also an Adjunct Professor of Chemistry at the University of Utah. Her research at the NRL focuses on multifunctional nanoarchitectures, with special emphasis on new nanostructured materials for catalytic chemistries, energy storage and conversion, biomolecular composites, porous magnets, and sensors. 

After receiving his doctorate, he joined the Monsanto Company in St. Louis as a senior research chemist and carried out research on the characterization and material properties of exploratory polymers and composites. While he was at Monsanto, his research interests focused on molecular weight characterization, particularly by size-exclusion chromatography. Recently, his research has focused on size-exclusion chromatography, particle size distribution analysis, cure chemistry and physics, and the application of computers in the polymer laboratory. He is the author of more than 100 publications, is credited with three patents, and has edited or co-edited 10 volumes in the ACS Symposium Series and co-edited two volumes in the Advances in Chemistry series. 

JOINING AND INTEGRATION OF ADVANCED CARBON-CARBON AND CARBON-SILICON CARBIDE COMPOSITES TO METALLIC SYSTEMS... 

M. Singh and R. Asthana, Joining of advanced ultra-high-temperature ZrB2-based ceramic composites using metallic glass interlayers, Mater. Sci. Eng. A. 460-461, 153-162 (2007). 

Vandana Singh is working as Associate Professor at Department of Chemistry, University of Allahabad, Allahabad, India. She joined the Chemistry Department as Lecturer in 1994. Her research interests are polysaccharides, polymers and polymer composites. Currently she is working on the biomemetic synthesis and applications of silica hybrids. She has over 70 international journal publications to her credit. She is Associate editor of Advanced Materials Letters, VBRl Press. 

In 1983 he joined the editorial board of Polymer, of which he thrar became main editor, and is also on the editorial boards of Journal of Applied Polymer Science, Polymer Contents, Polymers for Advanced Technologies, Korean Polymer Journal, and Trends in Polymer Science. He was awarded a D.Sc. from the Urriversity of Edinbtrrgh for Research Work on the hydrodynamics of polymCT solutiorrs, studies of relaxation processes in the glassy state of polymers, and on physical characterization of polymers. His crrrrent interests are centered on phase eqtrihbria in polymer blends, polymer hqtrid crystals, ion conduction in polymCT electrolytes, physical aging, and hqtrid crystalhne celltrlose/polymer blends and composites. 

The world of advanced fibre composites is changing rapidly. Technical and commercial battles take place in the composites arena, where big chemical companies have joined the show. The diagram shows a basic idea behind these involvements. The chemical industry thinks volume. Commodities and energy, products with a relatively low added value, have been their business over the past decades. Nowadays, however, High Tech is the message. Specialities with a high added value seem attractive. This is demonstrated by the amount of recent take overs of relatively... 

After 500 BC important theories were advanced by philosophers who lived in mainland Greece. Anaxagoras (500-428 BC) came from Ionia but settled in Athens, He proposed a completely different explanation of the composition of materials and of chemical change, maintaining that in every material there is a portion of every other material. Thus wheat contains not only wheat but also hair, skin, bone, gold, etc. When wheat is digested, some of the skin separates and joins to the skin already present in the animal. However, complete separation is never achieved, and every material always retains a portion of every other material,... 

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