Powder Metallurgy of Al-Al2O3 Composites (SAP) for Nuclear Applications

  • D. Gualandi
  • P. Jehenson


An important application of the methods of powder metallurgy in the aluminum industry is the oxidation to a given degree of aluminum powder, followed by sintering of the oxidized powder obtained. Euratom has sponsored a large research effort on these materials in view of their application as canning materials and components for calandria tubes for nuclear reactors.

The paper gives the results of such work at the ISML Laboratory (Italy), which has been concerned with (1) the achievement of a completely structurally stable material during prolonged heating through an effective degassing treatment during the processing of the material, with the attainment of better weldability as a consequence; (2) the amelioration of the quality of the starting powder in order to obtain the maximum uniformity of the semifinished products; (3) the development of fabrication methods, which will yield straight tubing with narrow dimensional tolerances and finned tubes with straight or helical fins, and methods of control of these tubes; (4) the complete elimination of metallic impurities (e.g., iron) in order to achieve improved resistance to corrosion, better formability, more homogeneous behavior toward organic materials, and smaller neutron absorption (the special product obtained is called “Puroxal”—for pure oxidized aluminum); and (5) the structure of these materials has been more clearly interpreted, quantitative measurements of the grains and interspacings between the particles of the dispersed phase (Al2O3 and others, such as Al4C3 and AIN) are given, and a theory explaining the influence of temperature, rate of straining, etc., on the mechanical properties up to 500°C is proffered.


Powder Metallurgy Fuel Element Semifinished Product Finned Tube Silicone Grease 


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  1. 1.
    Gualandi, D., and P. Jehenson, “Contribution to the Studies of the Technology of Al-Al2O3 Compounds with Regard to Nuclear Application,” paper presented to Third United Nations Conference on the Peaceful Uses of Atomic Energy, Geneva, May 1964.Google Scholar
  2. 2.
    “Euratom’s Scientific Activities. ORGEL Program Theoretical and Conceptual Studies,” Euratom Report No. Eur 1830 (1964).Google Scholar
  3. 3.
    Gualandi, D., and P. Jehenson, “Miglioramenti nella tecnologia di fabbricazione del SAP per ap-plicazioni nucleari,” Metallurgia Ital. 54: 291–299 (1962).Google Scholar
  4. 4.
    Gelli, D., D. Gualandi, and L. Mori, “Contribution à l’interprétation des courbes d’allongement du SAP sur la base d’un modèle viscoplastique,” paper presented at the Fall Meeting of the French Metallurgical Society, October 1964 (to be published in Revue de Métallurgie). Google Scholar
  5. 5.
    Guyot, P., “On the Mechanism of Plastic Deformation of SAP Type Alloys,” this volume, p.Google Scholar
  6. 6.
    Bonissoni, G., and M. Paganelli, “Studio delie particolarità strutturali del SAP-ISML mediante la microscopia elettronica e la diffrazione dei raggi X,” Euratom Report No. Eur 403 (1963).Google Scholar
  7. 7.
    Belvedere, C, “Sulla lavorazione plastica del SAP-ISML con particolare riferimento all’estrusione e trafilatura dei tubi a parete sottile,” Euratom Report No. Eur 428 (1963).Google Scholar
  8. 8.
    Gelli, D., and T. Federighi, “Risultati di misure della dissipazione interna e del modulo elastico dinamico sul SAP-ISML,” Alluminio 32: 371–376 (1963).Google Scholar
  9. 9.
    Paganelli, M., “Dimensioni dei sub-grani in estrusi di SAP 4, 7, 10 e 14% Al2O3 ricotti a 600°C e a 650°C,” Euratom Report No. Eur 1847 (1964).Google Scholar
  10. 10..
    Gelli, D., “Sulla possibilitá di descrivere con un modello generale le proprietá reologiche dei metalli e delle leghe. Aspetti generali del problema” (to be published).Google Scholar

Copyright information

© Metal Powder Industries Federation and The Metallurgical Society of AIME 1966

Authors and Affiliations

  • D. Gualandi
    • 1
  • P. Jehenson
    • 2
  1. 1.Istituto Sperimentale Metalli LeggeriNovaraItaly
  2. 2.Euratom: Centro Comune di RicercheIspra, VareseItaly

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