Ceramic Fibre Reinforced Metals

1966 ◽  
Vol 70 (668) ◽  
pp. 796-801
Author(s):  
J. Morley
Keyword(s):  
Silicon Carbide ◽  
Elastic Modulus ◽  
Beryllium Oxide ◽  
High Melting ◽  
Melting Points ◽  
Practical Applications ◽  
Specific Strength ◽  
Structural Metals ◽  
Strength And Stiffness ◽  
Very High

We want structural materials to be as strong as possible, as light as possible and as stiff as possible. For all practical applications they must be tough or resilient. We might also want them to be of use at high temperatures, to have hard surfaces, to be resistant to corrosion and to be cheap and easy to fabricate.With all orthodox structural metals strength and stiffness are roughly in proportion to the density of the material. There is therefore not a great deal of difference between them on the basis of specific strength and specific stiffness. This is illustrated in Table I.There are a number of ceramic substances such as silicon carbide, aluminium oxide, beryllium oxide, boron and carbon which have very high elastic modulus values coupled with low densities and high melting points.

Novel Iron(II) Complex as Single-Site Catalysts for Ethylene Polymerization

2011 ◽  
Vol 239-242 ◽  
pp. 3314-3318
Author(s):  
Zheng Zai Cheng ◽  
Ye Cong ◽  
Xiao Chao Yan ◽  
Yu Jing Nie ◽  
Su Su Lin ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Activity ◽  
Weight Distribution ◽  
Ethylene Polymerization ◽  
High Melting ◽  
Melting Points ◽  
H Nmr ◽  
Gel Permeation ◽  
Single Site Catalysts ◽  
Very High

Novel iron (II) complex C2has been prepared by treatment of the ligand C1with FeCl2in THF solution. The complex C1was characterized by MSand1H-NMR and complex C2was characterized by MSand element analyze. Activated by MAO, complex 2 exhibites very high activity and produces high molecular weight polyethylene. The molecular weight distribution measured by gel permeation reached 2.1 to 2.4. the GPC profile of PE obtained and High melting points measured by DSC indicates indicates that the polyethylene produced by complex C2is high linearity and high crystallinity.

The General Properties and Applications of Ceramic Materials

2012 ◽  
Vol 174-177 ◽  
pp. 215-218
Author(s):  
Peng Wang
Keyword(s):  
Silicon Carbide ◽  
Construction Industry ◽  
Building Materials ◽  
High Strength ◽  
Modern Society ◽  
Ceramic Materials ◽  
Metallic Materials ◽  
High Melting ◽  
Melting Points ◽  
Traditional Ceramics

There are two groups of ceramics, traditional and modern ones. Brick, cement tile, and glass are traditional ceramics. They are inorganic non-metallic materials with high melting points, high strength, good strength, and excellent oxidation resistance. Construction industry mainly depends on them. However, traditional ceramics are brittle, low strength, low resistance. Compared with traditional ones, modern ceramics are magnitude finer, more homogeneous, and less porous. They include alumina, silicon nitride, silicon carbide, and boron carbide. They can be applied to building materials, components, and aerospace. Therefore, modern ceramics have stronger adaptability to modern society. Ceramic engineers need in-depth research on design and application modern ceramics.

A New Periodic Cellular Metal With Kagome Trusses and Its Performance

Aerospace ◽  
2006 ◽  
Author(s):  
Yong-Hyun Lee ◽  
Ji-Eun Choi ◽  
Ki-Ju Kang
Keyword(s):  
Raw Materials ◽  
Future Market ◽  
New Materials ◽  
Specific Strength ◽  
Cellular Metal ◽  
High Specific Strength ◽  
New Type ◽  
Strength And Stiffness ◽  
Metal Wires ◽  
Very High

Periodic cellular metals (PCM), especially truss PCM's seem promising as new materials in 21 century. Various works have been performed for the mechanical and thermal performance. However, only a number of papers have been published regarding fabrication techniques of PCM, even though the techniques should determine whether PCM's is survived in the future market, or not. In this work a new type of PCM with Kagome trusses is presented. Continuous metal wires as the raw materials are assembled in six directions with least deflection, which gives very high specific strength and stiffness. The mechanical behavior under compression and bending of hand-made specimens is presented. Also, the benefits and features are discussed.

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

WIELAND DURO TUNGSTEN

Alloy Digest ◽  
2020 ◽  
Vol 69 (10) ◽  
Keyword(s):  
Melting Point ◽  
Physical Properties ◽  
Tensile Properties ◽  
Modulus Of Elasticity ◽  
Radiation Shielding ◽  
High Melting ◽  
High Modulus ◽  
High Melting Point ◽  
Structural Applications ◽  
Very High

Abstract Wieland Duro Tungsten is unalloyed tungsten produced from pressed-and-sintered billets. The high melting point of tungsten makes it an obvious choice for structural applications exposed to very high temperatures. Tungsten is used at lower temperatures for applications that can benefit from its high density, high modulus of elasticity, or radiation shielding capability. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on machining. Filing Code: W-34. Producer or source: Wieland Duro GmbH.

scholarly journals Materials for Automotive Lightweighting

2019 ◽  
Vol 49 (1) ◽  
pp. 327-359 ◽  
Author(s):  
Alan Taub ◽  
Emmanuel De Moor ◽  
Alan Luo ◽  
David K. Matlock ◽  
John G. Speer ◽  
...  
Keyword(s):  
Galvanic Corrosion ◽  
Low Carbon Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
New Materials ◽  
Specific Strength ◽  
Advanced High Strength Steels ◽  
Strength And Stiffness ◽  
The Cost

Reducing the weight of automobiles is a major contributor to increased fuel economy. The baseline materials for vehicle construction, low-carbon steel and cast iron, are being replaced by materials with higher specific strength and stiffness: advanced high-strength steels, aluminum, magnesium, and polymer composites. The key challenge is to reduce the cost of manufacturing structures with these new materials. Maximizing the weight reduction requires optimized designs utilizing multimaterials in various forms. This use of mixed materials presents additional challenges in joining and preventing galvanic corrosion.

Recent Advances in Development and Processing of Titanium Aluminide Alloys

2000 ◽  
Vol 646 ◽  
Author(s):  
Fritz Appel ◽  
Helmut Clemens ◽  
Michael Oehring
Keyword(s):  
High Temperature ◽  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Environmental Stability ◽  
Physical Metallurgy ◽  
Specific Strength ◽  
Wide Range ◽  
Structural Applications ◽  
Strength And Stiffness ◽  
Nickel Base

ABSTRACTIntermetallic titanium aluminides are one of the few classes of emerging materials that have the potential to be used in demanding high-temperature structural applications whenever specific strength and stiffness are of major concern. However, in order to effectively replace the heavier nickel-base superalloys currently in use, titanium aluminides must combine a wide range of mechanical property capabilities. Advanced alloy designs are tailored for strength, toughness, creep resistance, and environmental stability. Some of these concerns are addressed in the present paper through specific comments on the physical metallurgy and technology of gamma TiAl-base alloys. Particular emphasis is placed on recent developments of TiAl alloys with enhanced high-temperature capability.

scholarly journals Effects of plies orientations and initial geometric imperfections on buckling strength of a composite stiffened panel

2018 ◽  
Vol 191 ◽  
pp. 00008
Author(s):  
Ikram Feddal ◽  
Abdellatif Khamlichi ◽  
Koutaiba Ameziane
Keyword(s):  
Stiffened Panel ◽  
Buckling Mode ◽  
Element Analysis ◽  
Geometric Imperfections ◽  
Stiffened Panels ◽  
Specific Strength ◽  
Euler Buckling ◽  
Buckling Behavior ◽  
Composite Stiffened Panel ◽  
Strength And Stiffness

The use of composite stiffened panels is common in several activities such as aerospace, marine and civil engineering. The biggest advantage of the composite materials is their high specific strength and stiffness ratios, coupled with weight reduction compared to conventional materials. However, any structural system may reach its limit and buckle under extreme circumstances by a progressive local failure of components. Moreover, stiffened panels are usually assembled from elementary parts. This affects the geometric as well as the material properties resulting in a considerable sensitivity to buckling phenomenon. In this work, the buckling behavior of a composite stiffened panel made from carbon Epoxy Prepregs is studied by using the finite element analysis under Abaqus software package. Different plies orientations sets were considered. The initial distributed geometric imperfections were modeled by means of the first Euler buckling mode. The nonlinear Riks method of analysis provided by Abaqus was applied. This method enables to predict more consistently unstable geometrically nonlinear induced collapse of a structure by detecting potential limit points during the loading history. It was found that plies orientations of the composite and the presence of geometric imperfections have huge influence on the strength resistance.

scholarly journals INTERVIEW WITH MARKUS KAYSER

2016 ◽  
Vol 13 (26) ◽  
pp. 9-13
Author(s):  
L. A. BRANDINI DE DE BONI ◽  
E. GOLDANI
Keyword(s):  
High Melting ◽  
Melting Points ◽  
Additive Fabrication ◽  
Basalt Rock

In the current edition of the Journal, we interviewed Mr. Markus Kayser, a Ph.D. student at MIT. Mr. Kayser was interviewed about his Solar Sinter project, a machine that can melt sand using nothing more than sunlight. We asked him about the possibility of melting different materials other than sand, like basalt, since basalt and sand have high melting points. The basalt rock melts from 984 °C (1803.2 F) to 1260 °C (2300 F) and sand from 1600 °C (2912 F)to 1723 °C (3133,4 F). Mr. Kayser developed what appears to be a simple and affordable machine, which not only melts sand but also utilizes the process of digital additive fabrication to form useful objects.

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