Joining of SiC, alumina, and mullite by the Refractory Metal—Wrap pressure‐less process

Gianchandani, Pardeep Kumar; Casalegno, Valentina; De la Pierre des Ambrois, Stefano; Salvo, Milena; De Aloysio, Giulia; Laghi, Luca; Ferraris, Monica

doi:10.1111/ijac.13477

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The aim of this work was to discuss the suitability of the joining process called “RMWrap” (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 (3Al2O3.2SiO2). 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 (MoSi2, NbSi2, TaSi2, or ZrSi2) embedded in a siliconrich 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 (MoSi2/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).

Titolo:	Joining of SiC, alumina, and mullite by the Refractory Metal—Wrap pressure‐less process
Autori:	Gianchandani, Pardeep Kumar CASALEGNO, VALENTINA DE LA PIERRE DES AMBROIS, STEFANO SALVO, MILENA De Aloysio, Giulia Laghi, Luca FERRARIS, Monica mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2020
Rivista:	INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
Digital Object Identifier (DOI):	http://dx.doi.org/10.1111/ijac.13477
Appare nelle tipologie:	1.1 Articolo in rivista

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