CC BY
26iSHS 2019
Moscow, Russia
REACTIVE FORGING - PROCESSING OF DENSE MATERIALS AND PARTS WITH FINE MICROSTRUCTURE BY PRESSURE ASSISTED SHS
E. Y. Gutmanas*" and I. GotmanA
aTechnion-Israel Institute of Technology, Department of Materials Science and Engineering,
Haifa, 32000 Israel
^Department of Mechanical Engineering, ORT Braude College, Karmiel, 21982 Israel
e-mail: gutmanas@technion.ac.il
DOI: 10.24411/9999-0014A-2019-10050
Exothermic reactions between components of reactive materials result in pronounced evolution of energy in short period of time. In the last decade a gradual shift to applied research has led to the development of a number of unconventional processes based on exothermic reactions that allow simultaneous synthesis and consolidation of porous combustion products. Pressure assisted thermal explosion, TE, mode of self-propagating high-temperature synthesis, SHS, results in dense products in cases when the heat evolved during TE and pressure applied are sufficient for consolidation.
SHS/TE-based reactive forging (RF) has been developed: self-sustained reaction is ignited by rapid heat transfer from preheated press rams to the exothermic blend, and uniaxial pressure is applied. Combined with short distance infiltration (SDI) approach, RF provides conditions for fabrication of interpenetrating phase in situ composites with binary or ternary ceramics, intermetallics, intermetallic-ceramic, and metal-ceramic composites [1-5]. Compared to traditional melt infiltration, SDI has the advantage of the considerably shorter infiltration distances (^m vs. mm/cm).
The RF-SDI approach has also been successful in fabrication ceramic matrix-diamond grinding wheels, ceramics nozzles, light armor tiles, sputtering targets. Nanostructuring of powder blends results in lower ignition temperatures, Tig, and can be used for ignition of high Tig blends and thus for fabrication of multicomponent materials. RF approach employing exothermic inserts and "chemical furnace" approach can be used for consolidation of refractory materials. Shape charge liners (SCL) based on use of reactive materials and especially those with high specific weight can improve the performance of shape charge liners.
Simultaneous synthesis and consolidation of reaction products employing pressure assisted SHS is a "green", cost effective and thus perspective fabrication route of structural parts.
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2. E.Y. Gutmanas, I.Gotman, Dense high temperature by thermal explosion under pressure, J. Eur. Ceram. Soc., 1999, vol. 19, pp. 2381-2393.
3. D. Horvitz, I. Gotman, E.Y. Gutmanas, N. Claussen, In situ processing of dense AhO3-Ti aluminide interpenetrating phase composites, J. Eur. Ceram. Soc., 2002, vol. 22, pp. 947954.
4. Y. Khoptiar, I. Gotman, E.Y. Gutmanas, Pressure assisted combustion synthesis of dense layered Ti3AlC2 carbide and its mechanical properties, J. Amer. Ceram. Soc., 2005, vol. 88, pp. 28-33.
5. I. Gotman, E.Y. Gutmanas, Reactive forging - pressure assisted thermal explosion mode of shs for processing dense in situ composites and structural parts: a review; Adv. Eng. Mater., 2018, vol. 20, no. 8, 1800376.
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