Read e-book online Advances in Particulate Materials PDF

By A. Bose

Advances in Particulate fabrics introduces the ways and ideas linked to easy powder construction, and info the main serious, state of the art developments within the region of fabrics processing and particulate fabrics. because the calls for of recent expertise raise, particulate fabrics enables the construction of various complicated fabrics which may be used in aerospace, automobile, security, chemical, and clinical industries.

Provides in-depth assurance of a few of the main intriguing and an important advancements within the zone of particulate fabrics
Covers either processing and the fabrics point of a few of the rising parts of particulate fabrics

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Examples of such materials can include aluminum and lead. A hard and brittle material is, however, not expected to show any significant green strength or densification with increasing pressure, though some degree of densification may occur due to the fragmentation of the brittle particles. A powder with a spherical shape will result in poor densification with applied pressure and is expected to exhibit the worst green strength. A powder that has a layer of surface oxide will hinder the development of chemical bonds, and thereby reduce the green strength of the part.

Thus, for this class of material the consohdation process should use the simultaneous application of tempera­ ture and pressure, with the temperature being on the low side as well as the time of exposure at the elevated temperature being very short. ), rapid omnidirectional compaction (ROC), or explosive compaction could be used to consolidate these materials (metallic glasses) to try to preserve as much as possible their amorphous characteristics. 8. Hazards Posed by Particulate Materials One aspect of P/M technology that is increasingly coming under closer scrutiny, especially when fine powders are used, is the potential hazard that is posed by the powder itself.

A "softer" material is expected to compact very well and attain very high densities at low pressures, with the green compacts exhibiting high strengths. Examples of such materials can include aluminum and lead. A hard and brittle material is, however, not expected to show any significant green strength or densification with increasing pressure, though some degree of densification may occur due to the fragmentation of the brittle particles. A powder with a spherical shape will result in poor densification with applied pressure and is expected to exhibit the worst green strength.

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