Powdered Metals

Ammonium perchlorate Hot copper tubing, sugar, flnely divided organic or combustible materials, potassium periodate and permanganate, powdered metals, carbon, sulfur... 

Metal passivation Metal pickling Metal powders Metal recovery... 

Miscellaneous Methods. Powdered metals such as aluminum, chromium, nickel, and copper, along with various aHoys, can be appHed to parts by electrostatic deposition. The metal strip containing the attached powdered metal must be further processed by cold rolling and sintering to compact and bond the metal powder. 

A. T2cM y,A.tomicyation The Production of Metal Powder, Metal Powder Industries Federation, Princeton, N.J., 1992. 

S. J. Sindeband and P. Schwart2kopf, "The MetaUic Nature of Metal Borides," 97th Meeting of the Electrochemical Society Cleveland, Ohio, 1950 Powder Metall Bull 5/3, 42 (1950). 

J. J. Burke, ed.. Powder Metal Migh-Peformance Applications, Proceedings of the 18th S agamore Army Material Kesearch Conference, Syracuse University Press, Syracuse, N.Y., 1972. Review on siUcon carbide—siUcon nitride ceramics. 

In the microelectronics industry, powdered metals and insulating materials that consist of noimoble metals and oxides are deposited by screen printing in order to form coatings with high resistivities and low temperature coefficients of resistance. This technique may be useful in depositing oxide—metal refractory coatings. 

In metallurgical practice, sodium uses include preparation of powdered metals removal of antimony, tin, and sulfur from lead modification of the stmcture of siHcon—aluminum alloys appHcation of diffusion alloy coatings to substrate metals (162,163) cleaning and desulfurizing alloy steels via NaH (164) nodularization of graphite in cast iron deoxidation of molten metals heat treatment and the coating of steel using aluminum or zinc. 

When a diazonium salt is allowed to react with antimony pentachloride or an aryltetrachloroantimony compound, the onium salts [ArN2] [SbClg] or [ArN2] [Ar SbCl ], respectively, are formed. These can be decomposed ia an organic solvent by the addition of a powdered metal such as iron or ziac, with the formation of a diaryltrichloroantimony compound ... 

Beryllium and aluminum are virtually insoluble in one another in the soHd state. The potential therefore exists for an aluminum—beryllium metal matrix composite with lower density and higher elastic modulus, ie, improved specific modulus, than conventional aluminum alloys produced by ingot or powder metal processing. At least one wrought composite system with nominally 62 wt % Be and 38 wt % A1 has seen limited use in aerospace appheations (see Composites). 

Graphite lubricants include the dry powder, admixtures with liquid lubricants or greases, volatile liquids compounded with film-forming substances to produce bonded dry films, synthetic resins and powder metal compositions containing graphite for bearings, and finely divided suspensions in liquids (colloidal graphite). 

Chlorates are strong oxidising agents. Dry materials, such as cloth, leather, or paper, contaminated with chlorate may be ignited easily by heat or friction. Extreme care must be taken to ensure that chlorates do not come in contact with heat, organic materials, phosphoms, ammonium compounds, sulfur compounds, oils, greases or waxes, powdered metals, paint, metal salts (especially copper), and solvents. Chlorates should be stored separately from all flammable materials in a cool, dry, fireproof building. 

A. S. Diamond and L. O. Jones, Copier Powders, Metals Handbook, Vol. 7, 9th Ed., American Society for Metals, Menlo Park, Calif., 1984, pp. 

Small particles can be introduced into metals or ceramics in other ways. The most obvious is to mix a dispersoid (such as an oxide) into a powdered metal (aluminium and lead are both treated in this way), and then compact and sinter the mixed powders. 

PROCESS MATERIAL. IMPACT EXTRUSION COLD FORMING COLD EXTRUSION SHEET METALWORK MACHINING POWDER METAL SINTERING... 

There is a material to process compatibility risk for impact extrusion, cold forging, cold extmsion, sheet metalworking, machining and powder metal sintering processes because their respective process capability maps relate to the ideal material case. 

POWDER METAL SINTERING PROCESS CAPABILITY MAP (RADIAL TOLERANCES ONLY)... 

Fillers fibreglass, silicas, calcium carbonate, powdered metal pigments some may be absorbed potential primary irritant dust inhalation low toxicity... 

Fire Hazards - Flash Point Not flammable, but may cause or increase the intensity of a fire Flammable Limits in Air (%) Not flammable Fire Extinguishing AgerUs Not pertinent Fire Extinguishing Agents Not To Be Used Not pertinent Special Hazards of Combustion Products Not pertinent Behavior in Fire Can form explosive mixture with combustible material or finely powdered metals. Increases the intensity of fires Ignition Temperature Not pertinent Electrical Hazard Not pertinent Burning Rate Not pertinent. 

As a result of hydrolysis, moist chlorine eontains hydroelilorie and hypochlorous acids, wliicli are veiy eorrosive to most eommon metals. Clilorine also ean reaet explosively witli powdered metals. 

---