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Medientyp:
E-Artikel
Titel:
Joining of SiC, alumina, and mullite by the Refractory Metal—Wrap pressure‐less process
Beteiligte:
Gianchandani, Pardeep Kumar;
Casalegno, Valentina;
De la Pierre des Ambrois, Stefano;
Salvo, Milena;
De Aloysio, Giulia;
Laghi, Luca;
Ferraris, Monica
Erschienen:
Wiley, 2020
Erschienen in:International Journal of Applied Ceramic Technology
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>The aim of this work was to discuss the suitability of the joining process called “RM‐Wrap” (RM = Refractory Metals, ie, Mo, Nb, Ta, Zr) as a pressure‐less and tailorable technique to join several different ceramics such as SiC, alumina, and mullite (3Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>.2SiO<jats:sub>2</jats:sub>). In the RM‐Wrap joining technique the refractory metal foil is used as a wrap containing one or more silicon foils. It is performed at 1450°C, under flowing argon, and the resulting joining materials are in situ formed composites made of refractory metal disilicides (MoSi<jats:sub>2</jats:sub>, NbSi<jats:sub>2</jats:sub>, TaSi<jats:sub>2</jats:sub>, or ZrSi<jats:sub>2</jats:sub>) embedded in a silicon‐rich matrix; their coefficient of thermal expansion has been calculated and the Laser Flash Method was used to measure the thermal diffusivity of one of them (MoSi<jats:sub>2</jats:sub>/Si) in 25°C‐1000°C range, then to calculate its thermal conductivity. All the obtained joints are uniform, continuous, and crack free. Some preliminary oxidation tests were carried out on all joints at 1100°C, 6 hours in air, giving unchanged morphology of the interface and the joining materials itself; the joint strength of RM‐Wrap joined SiC was measured at room temperature using three different mechanical tests: (a) single lap (SL), (b) single lap off‐set (SLO) and (c) torsion on hourglass‐shaped samples (THG) (on Mo‐wrap joined SiC).</jats:p>