By Gerald I. Friedman, John M. Kazaroff (auth.), Henry H. Hausner (eds.)
Aluminum P/M elements may be construction sintered in a variety of different types of furnaces and atmospheres. collection of sintering furnace is dependent upon financial concerns and creation premiums wanted. Batch furnaces have lowest funding bills and are sufficient for low to medium construction while non-stop furnaces are extra expensive yet supply greater construction charges. powerful, well-sintered P/M components might be received in atmos pheres of nitrogen, dissociated ammonia and in vacuum. Atmos phere choice depends on amenities to be had inside of person crops plus estate requisites. maximum strengths are produced in nitrogen via vacuum and dissociated ammonia. Repro ducible dimensions should be accomplished with right consciousness to com pact density, sintering temperature, dew aspect and surroundings. REFERENCES 1. J. H. Dudas and W. A. Dean, "'llie construction of Precision Aluminum P/M Parts," foreign magazine of Powder Metallurgy, Vol. five, April, 1969. 2. P. F. Mathews, "Effects of Processing Variables at the houses of Sintered Aluminum Compacts,!! foreign magazine of Powder Metallurgy, Vol. four, October, 1968. three. J. H. Dudas and ok. J. Brondyke, "Aluminum P/M components - Their houses and Performance,!! Technical Paper No. 700141, Society of automobile Engineers, Inc., Pennsylvania Plaza, big apple, long island, 10001. four. okay. R. Van Horn (Editor), Aluminum Vol. I, pp. 26-28, American Society for Metals, Metals Park, Ohio, 1967.
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Additional resources for Modern Developments in Powder Metallurgy: Volume 5: Materials and Properties Proceedings of the 1970 International Powder Metallurgy Conference, sponsored by the Metal Power Industries Federation and the American Powder Metallurgy Institute
S. BENJAMIN AND R. L. 4 Estimated rrom oxygen content Figure 2a. Identification of dispersoid and y' is difficult due to the complex nature of the etched surface. The transverse grain dimension of the TD Nickel is 1 to 2 microns compared to a value of' 50 to 100 microns in the dispersion strengthened superalloy determined from Figure lao Thoria can be seen in the TD Nickel as can differential etching patterns delineating the grains. Figure 3 shows transmission electron micrographs of these materials.
5). Gas analysis per~ormed during this investigation indicated the level o~ undissociated ammonia in the sintering atmosphere was less than 1 ppm at the dryer but it re~ormed to 8-15 ppm in the furnace. It appears then that both hydrogen and undissociated ammonia can be a source for hydrogen absorption by the liquid phase at the sintering temperature. This can lead to increased J. H. DUDAS AND C. B. THOMPSON 31 porosity in the compact during solidification and reduce the tensile properties of P/M parts.
R. . · . 1:. ~ ..... ~.. -········1··· ..... ; . ••• j" :)1; · _... ;. - ...... 042 Powder ANALYSES OF INCO 718 IN VARIOUS STAGES OF PROCESSING TABLE 3 FIGURE 5 ............ j>. " -t NEW P/M MATERIALS 42 Ambient temperature and 1200 of. properties were run on the 701. A. forged billets and no significant difference in properties were observed between the forged powder billets and the forged commercial bar stock billets. , Cool 100 of/hr. , AC). Test specimens were cut from the heat treated pieces and these were tested for typical customer requirements.