Synthesis and densification of Ni{sub 3}(Si, Ti) intermetallics by hot isostatic pressing
- Katholieke Univ., Leuven (Belgium)
- IMT Europe, Sint Niklaas (Belgium)
The production of complex parts from Ni{sub 3}(Si, Ti) intermetallic materials by reactive powder metallurgy offers significant advantages over more conventional processing techniques. The main problem associated with reactive powder metallurgy is controlling the exothermic reaction accompanying the synthesis of the intermetallic compound. The uncontrolled release of heat during the conversion of the reactants into nickel silicide leads to unacceptable deformation and melting of the part. The thermal evolution of a part during reactive synthesis of the intermetallic phase is described based on kinetic and heat transfer equations, giving the temperature and phase change as a function of the applied temperature cycle and the mass and size of the part under consideration. From this model, methods for controlling the exothermic reaction during synthesis are derived. When preparing nickel silicides by reactive powder metallurgy, the application of external pressure is required to eliminate porosity and to obtain good mechanical properties. The properties of materials produced by hot isostatic pressing, with different methods of reaction control, are compared to materials prepared from prealloyed powders. It is shown that by reactive HIP, materials can be obtained with a fracture strength exceeding 2,000 MPa.
- OSTI ID:
- 442829
- Report Number(s):
- CONF-960515-; ISBN 0-87170-568-0; TRN: IM9712%%254
- Resource Relation:
- Conference: International conference on hot isostatic pressing, Andover, MA (United States), 20-22 May 1996; Other Information: PBD: 1996; Related Information: Is Part Of Hot isostatic pressing: Conference proceedings; Froes, F.H.; Hebeisen, J.; Widmer, R. [eds.]; PB: 312 p.
- Country of Publication:
- United States
- Language:
- English
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