Silicide reinforcement

Key words Titanium in-situ composites, discontinuous reinforcement, silicide reinforcement, boride reinforcement, mixed silicide-boride reinforcement, ductile reinforcement, microstructure, a -phase, (3-phase, mechanical properties, fracture mechanisms. 

Several fiber types have been mentioned so far, and several other types have been neglected that have been worked on over the past few years. Some of those not discussed may become important fibers for reinforcement in the years ahead. To date though, they have not been available in sufficient quantity for thorough evaluation in composite specimens. Included in this group are boron carbide, spinel, polycrystalline alumina and silica, titanium diboride, and miscellaneous silicides and intermetallics. Ten years from now as we look back on the 70s we no doubt will have an entirely different view of some of these materials. 

In investigations [21-22] our attention was paid mainly to the development of natural composites with boride and silicide hardening, in which reinforced phase is formed through eutectic crystallization. 

Titanium-based composites discontinuously reinforced with silicides, borides and their mixtures are an attractive candidate to be a material with... 

The purpose of the work given was to study the features of structure and mechanical behavior of Ti in-situ composites reinforced with silicide, boride and their joint phases arising in Ti-Si and Ti-B-systems being in as-cast and deformed states. 

In order to take advantage of the superior properties of these refractory silicides in combination with a ductile titanium matrix particle and fiber reinforced composites based on a-Ti-Si-(Al) have been developed. Two different processing routes have been performed ... 

E. Fitzer, W. Remmele Possibilities and Limits of Metal Reinforced Refractory Silicides, Especially Molybdenum Disilicides", Fifth International Conference on Composite Materials, AIME, 1985, p. 515. 

M.J. Maloney and R.J. Hecht, Development of continuous Fiber-Reinforced MoSi2-base Composites, in High Temperature Silicides, Eds., A.K. Vasudevan and J.J. Petrovic, North Holland, NY, 19-32 (1992). 

The history of ceramics is as old as civilization, and our use of ceramics is a measure of the technological progress of a civilization. Ceramics have important effects on human history and human civilization. Earlier transitional ceramics, several thousand years ago, were made by clay minerals such as kaolinite. Modem ceramics are classified as advanced and fine ceramics. Both include three distinct material categories oxides such as alumina and zirconia, nonoxides such as carbide, boride, nitride, and silicide, as well as composite materials such as particulate reinforced and fiber reinforced combinations of oxides and nonoxides. These advanced ceramics, made by modem chemical compounds, can be used in the fields of mechanics, metallurgy, chemistry, medicine, optical, thermal, magnetic, electrical and electronics industries, because of the suitable chemical and physical properties. In particular, photoelectron and microelectronics devices, which are the basis of the modern information era, are fabricated by diferent kinds of optical and electronic ceramics. In other words, optical and electronic ceramics are the base materials of the modern information era. 

Engineering ceramics can be classified into three—oxides, nonoxides, and composites. Examples for oxides are alumina and zirconia. Carbides, borides, nitrides, and silicides come under nonoxides. Particulate-reinforced oxides and nonoxides are examples for composites. Oxide ceramics are characterized by oxidation resistance, chemical inertness, electrical insulation. 

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