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Cold compaction

Contamination limits the amount of handling and atmospheric exposure the powder can be subjected to before consoHdation. The consoHdation method most widely used is cold compaction and sintering. [Pg.105]

Articles formed from UHMWPE polymers can be prepared in a one step process by using high temperature compression, or in a two step process comprising cold compaction molding followed by high temperature compression molding. [Pg.81]

K. Clark, J. Ehlers, and L. Wang, Method for making articles by cold compaction molding and the molded articles prepared thereby, US Patent 6846869, assigned to Hcona LLC (Summit, NJ), January 25, 2005. [Pg.105]

The ability to dr aw approximately 100 - A diameter fibrils from PTFE dispersion particles, either by fracture after cold compaction [34] or by uniaxial or biaxial expansion of sheets or tubes after paste extrusion (extrusion of mixtures of the dispersion particles and lubricants such as mineral spirits) and lubricant removal [35], was demonstrated a number of years ago. The former process results in the development of a myriad of fibrils spanning the gap between the fracture faces these were utilized for ED characterization of the PTFE conformation and crystal packing. [Pg.142]

POSTER TITLE STRUCTURAL EVOLUTION OF COLD COMPACTED Al-Co ALLOY SYSTEM... [Pg.5]

Bulk oxide fuels are fabricated by cold compaction followed by sintering at an elevated temperature. Loose particles or optimum mixtures of several sizes of spherical (sol-gel) particles are packed directly into the cladding, and such particulate fuel is subjected to vibratory compaction. [Pg.546]

The UO2 powder obtained by this process is readily granulated and sintered, without the addition of binders, to controlled densities. Pore size distribution can be controlled by addition of UsOg. The pellets have high stability (no further densification takes place during operation). The pellet density in the French (dci) process is controlled by the cold compaction pressure in forming the green compacts. The ammonium uranyl carbonate (AUC) process in Germany (KWU) produces UO2 powder that flows freely as... [Pg.552]

The apparatus used to study densification by compression is shown in Figure 1 (a). It consists of a steel die and piston 2.5 cm in diameter capable of being heated to various temperatures during pressing. The travel of the piston was measured as a function of applied pressure. Ten-gram samples of minus 10 mesh pine sawdust dried at 110 C were held at temperature for 15 min after initial cold compaction at 200 psi, and the pressure was then increased in 300-psi increments to 10,000 psi. The resulting densities are shown as a function of pressure in Figure 2 for temperatures from 100-225 C, Runs were made also at 250 and 300 C, but wood was heavily pyrolyzed in the process and the results were discarded. [Pg.169]

Stable composites of metals and polymers which have a wide range of very interesting mechanical and electrical properties have been obtained recently by radiation crosslinking of polymers and metal powders after cold compaction. Interest is growing very rapidly in this field and industrial plants may well be developed. [Pg.183]

Flat-panel screens contain mercury (except for plasma screens). These flat panel screens require separate internal lighting sources to illuminate the liquid-crystal flat screens from behind. Usually this is a cold-compact fluorescent lamp (CCFL) which contains mercury. [Pg.121]

The pcD manufacturing process can be roughly divided into three stages cold compaction, hot compaction, and liquid phase sintering of the diamond compact. [Pg.513]

Kolomiitsev [147] and Uehara [148] studied the compaction behavior of diamond compacts under high pressures. Kolomiitsev showed that there are basically three processes taking place during cold compaction, see Fig. 22 particle rearrangement, crushing of diamond particles, and filling of voids by crushed particles. [Pg.513]

Figure 22. Schematic description of processes taking place during cold compaction. Figure 22. Schematic description of processes taking place during cold compaction.
The powder, which has a lower number of sharp edges per particle, is more stable to compression forces than the one with many spallings, sharp edges, etc. Since their weakest planes are the planes where they contain inclusions the density, size and shape of the inclusions may be a critical factor in the crushing of diamond particles during the cold compaction stage. [Pg.514]

During cold compaction of diamond powders, coarser powders densify more and have larger size pores than finer powders at a given pressure. [Pg.518]

Carlone P, Palazzo GS (2006) Computational modeling of the cold compaction of ceramic powders. Int Appl Mech 42 1195-1201... [Pg.285]

The electrolyte for the battery is a LiCl/KCl mixture with a temperature of 430—490°C. Batteries are constructed on the parallel-plate principle with alternate anodes and cathodes, and in each inter-electrode space there is a boron nitride cloth or felt separator. Commonly there is one extra negative plate because some lithium is lost during cycling. The plates, typically 5 mm thick, were initially prepared by cold compaction techniques, the active material being compressed into a fine metal lioneycomb material which also acts as the current collector. The negative electrode was just the li/Al alloy in an Fe lattice while the positive electrode was a mixture... [Pg.274]

Truss R.W., K.S. Han, J.E Wallace, and RH. Geil. 1980. Cold compaction molding and sintering of ultra-high molecular weight polyethylene. Poly Engr Sci 20 747-755. [Pg.35]

Barraclough KG, Loni A, Caffull E, Canham LT (2007) Cold compaction of silicon powders without a binding agent. Mater Lett 61 485—487... [Pg.590]

From these data it is evident that the behavior of these powders during compaction seems to be roughly similar however, the influence of pressure on relative density is more evident in the case of TiN. This can be e q)lained by more covalent and req>ectively more brittle nature of silicon nitride. It has be pointed out that there is significant influence of chemical bond on conq>ressibility for UFPs. It is also important to indicate that there is no possibility to obtain near dense conq>acts fi om UFPs in the conditions of cold compaction even at the conq>action pressures up to 8-9 GPa. [Pg.297]

Blended elemental P/M parts of Ti-6A1-4V are currently in production for aerospace and nonaerospace apphcations where fill wrought properties are not required and where there is economic advantage to this approach. (See the section Apphcations for examples). The PA approach, however, has been less successfiil in estabhshing a commercial market. Prealloyed powders are not cold compactable, and their cost is high ( 60 to 100/lb). [Pg.288]

Acrawax C Powdered and Atomized is traditionally used as a lubricant and binder for cold compaction of powdered metal parts. [Pg.200]

A cold compaction of SPS powders at a temperature well below its melting temperature (273 °C) was found possible [108]. In addition, the mechanical properties of the resulting material were comparable to those of the SPS submitted to compression molding after melting. Parallel experiments on poly(ethylene terephthalate) (PET) and linear low-density polyethylene (LLDPE) suggest that the behavior of SPS is a peculiarity of such polymers, which is likely connected to their polymorphic nature. [Pg.184]


See other pages where Cold compaction is mentioned: [Pg.184]    [Pg.22]    [Pg.22]    [Pg.82]    [Pg.227]    [Pg.365]    [Pg.50]    [Pg.553]    [Pg.346]    [Pg.174]    [Pg.868]    [Pg.1170]    [Pg.513]    [Pg.515]    [Pg.16]    [Pg.285]    [Pg.396]    [Pg.111]    [Pg.283]    [Pg.28]    [Pg.174]    [Pg.228]    [Pg.587]   
See also in sourсe #XX -- [ Pg.513 ]

See also in sourсe #XX -- [ Pg.228 ]




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