Ceramic Carbides

As to ceramic membranes [3,4] the focus has been so frir in particular on amorphous porous aluminas and silicas. Other inorganics studied include titania, zirconia, non-oxide ceramics (carbides), and microporous carbons. 

Some modern fields of technology require development of materials with a high hardness, abrasion resistance, and corrosion resistance for high-temperature applications. Although a number of special high-temperature materials have been developed (e.g. oxide ceramics, carbides, nitrides, etc.), a combination of the properties of metals with those of ceramics is more advantageous in many instances. A suitable solution may be provided by a layer of a ceramic material on a massive nietal component. 

Another vapor phase method involves reacting a solid particulate phase with a gas to form particles. One method is the self-propogating high temperature synthesis (SHS) method. Also used for making sintered bodies, SHS can be used in reacting particles with the gas phase. An example of combustion synthesis involves forming ceramic carbide powders. ... 

Refractory compounds such as ceramic carbides, borides and nitrides are characterized by high melting points, high hardness and good chemical inertness and... 

Glass fibers, which are derived from a melt, were discussed in Chapters 4 and 5. Glass fibers, which are derived from a viscous solution, will be described in this chapter. The most important applications of glass fibers made by any process will be discussed in Chapter 6. Carbon fibers and ceramic carbide and oxide fibers, which are derived from solid precursor fibers, will be discussed, along with their applications, in Chapters 8 to 12,... 

Steel disk, are used for very difficult cutting operations, especially on noiunetallics such as ceramics, carbides, and cermets, stone, and reinforced composites. 

Prevention of abrasive wear is possible through proper material selection and the use of surface engineering treatments. A number of material families have demonstrated good resistance to abrasive wear. They are typically hard materials that resist scratching, and include ceramics, carbide materials, alloyed white cast irons containing hard chromium carbides (see Fig. 8), and hardened alloy steels. 

Properties of Dense Silicon Carbide. Properties of the SiC stmctural ceramics are shown in Table 1. These properties are for representative materials. Variations can exist within a given form depending on the manufacturer. Figure 2 shows the flexure strength of the SiC as a function of temperature. Sintered or sinter/HIP SiC is the preferred material for appHcations at temperatures over 1400°C and the Hquid-phase densified materials show best performance at low temperatures. The reaction-bonded form is utilized primarily for its ease of manufacture and not for superior mechanical properties. 

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