Riassunto
Aluminum P/M parts can be production sintered in various types of furnaces and atmospheres. Selection of sintering furnace depends upon economic considerations and production rates desired. Batch furnaces have lowest investment costs and are adequate for low to medium production whereas continuous furnaces are more costly but provide higher production rates. strong, well-sintered P/M parts can be obtained in atmos pheres of nitrogen, dissociated ammonia and in vacuum. Atmos phere selection depends upon facilities available within individual plants plus property requirements. Highest strengths are produced in nitrogen followed by vacuum and dissociated ammonia. Repro ducible dimensions can be achieved with proper attention to com pact density, sintering temperature, dew point and atmosphere. REFERENCES 1. J. H. Dudas and W. A. Dean, "'llie Production of Precision Aluminum P/M Parts," International Journal of Powder Metallurgy, Vol. 5, April, 1969. 2. P. F. Mathews, "Effects of Processing Variables on the Properties of Sintered Aluminum Compacts,!! International Journal of Powder Metallurgy, Vol. 4, October, 1968. 3. J. H. Dudas and K. J. Brondyke, "Aluminum P/M Parts - Their Properties and Performance,!! Technical Paper No. 700141, Society of Automotive Engineers, Inc., Two Pennsylvania Plaza, New York, New York, 10001. 4. K. R. Van Horn (Editor), Aluminum Vol. I, pp. 26-28, American Society for Metals, Metals Park, Ohio, 1967.
Contenuti
New P/M Materials.- Properties of Hot Pressed Titanium Alloy Powders for. Cryogenic Applications.- Improved Sintering Procedures for Aluminum P/M Parts.- Experimental Manufacture of Inconel Alloy 718 Compressor Rotor Blades from Metal Powder Preforms.- Elevated Temperature Mechanical Properties of a Dispersion Strengthened Superalloy.- New Developments in Superalloy Powders.- A Correlation of Mechanical Properties of Sintered U-700 Powder with Particle Boundary Morphology.- Dispersion Strengthening.- The Stability of Oxide Dispersions in Iron- and Nickel-Based Alloys.- Hardening with a Dispersion of Small Holes.- Dispersion-Hardened Materials with Copper as a Base Metal.- The High-Temperature Strength of Oxide-Strengthened Nickel Alloys.- The Manufacture and Properties of High-Conductivity High Strength Cu-ThO2.- Dispersion Strengthened Ferritic Heat-Resisting Steel.- P/M Refractory Materials and Specialty Products.- Relations between Stereometric Microstructure and Properties of Cermets and Porous Materials.- Porous Stainless Steel — The Unique Filter Medium.- About Nitrides and Carbonitrides and Nitride-Based Cemented Hard Alloys.- Composition and Properties of the Binder Metal in Cobalt Bonded Tungsten Carbide 0.- High-Strength Tungsten Carbides.- Physical Properties of Monocarbides of Zirconium, Niobium, and Their Alloys in Homogeneity Range.- TZM Molybdenum Alloy Via P/M.- The Fabrication of Two Phase Alloys in the Ruthenium-Gold-Palladium System.- Oxides and Nuclear Materials.- Reduced Mierogels — A New Form of Powdered Metals and Metal Oxides.- The Density of Coextruded Metal Cladded Rod Core as Function of Cartridge Density and Core Length.- The Influence of Powder Characteristics on Process and Product Parameters of Uranium Dioxide.- Matrix Hardening in Dispersion Strengthened Powder Products.- P/M Properties and Testing.- Characterization of Commercial Metal Powders with Scanning Electron Microscope.- Gamma Ray Density Gauging.- Point Density Measurement and Flaw Detection in P/M Green Compacts.- Test Procedure for the Determination of the Corrosion Resistance of Sintered Iron and Bronze Parts.- The Effect of Material Characteristics on the Compaction Behaviour of Metal Powders.- The Effect of Presintering on the Dimensional Change of Iron Powder Compacts.- Sintered and Heat Treated 4640 Steel.- Characterization of the Microstructure of a Sintered 4640 Steel.- A New Approach for the Production of Maraging Steel P/M Parts.
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