By A. Bose
Advances in Particulate fabrics introduces the methods and ideas linked to easy powder construction, and info the main severe, cutting-edge developments within the zone of fabrics processing and particulate fabrics. because the calls for of recent expertise raise, particulate fabrics allows the creation of various complicated fabrics which may be used in aerospace, automobile, security, chemical, and clinical industries.
Provides in-depth insurance of a few of the main interesting and an important advancements within the zone of particulate fabrics
Covers either processing and the fabrics element of a few of the rising parts of particulate fabrics
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Chemically produced powders that use various salts or other organometalUc precursors also have the ability to produce amoφhous metallic powders of different materials. The chemically produced powders have the added advantage of being able to produce atomic-scale mixtures of materials that do not normally have any solubility for each other. The above processes also have the abihty to produce nanocrystalline powders. Some of these advances will be discussed in detail in later chapters. The crystalline state of the particles that are used as the starting materials for processing P/M parts often dictates the choice of the subsequent consolida tion steps.
Thus, nonconventional techniques like dynamic compaction or explosive shock compaction seem to hold promise for producing bulk amoφhous alloys. Nanocrystalline materials (also termed nanophase materials, nanocrystals, nanostructures or microcrystalUne aUoys) are a relatively new generation of materials in which the crystal sizes are often in the order of few nanometers. The extremely fine dimensional scale of the microstructure leads to novel and enhanced properties. Mechanical alloying can produce an equiaxed nanocrystalUne structure in a number of systems.
These unusual properties of refractory metals provide engineers with a pool of materials that can potentially be used in numerous applications, some of which have been outlined in a booklet published by the Metal Powder Industries Federation . One of the most extensively used and widely available refractory materials is tungsten. One of the most common applications of tungsten that every reader will be familiar with is in filaments for light bulbs. Tungsten oxide, unfortunately, is volatile above 811 Κ (538°C), so to use it at high temperatures the material has to be coated, or used in a protective atmosphere or in vacuum.