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Fracture toughness of hydroxide catalysis bonds between silicon carbide and Zerodur low thermal expansion glass-ceramic

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Author: Ende, D.A. van den · Gubbels, G.H.M.
Type:article
Date:2014
Source:Materials Chemistry and Physics, 3, 143, 1236-1242
Identifier: 487292
doi: doi:10.1016/j.matchemphys.2013.11.028
Keywords: Materials · Carbides · Ceramics · Fracture and toughness · Mechanical properties · Mechanical testing · Surfaces · Industrial Innovation · Mechanics, Materials and Structures · HOL - Holst ; MIP - Materials for Integrated Products · TS - Technical Sciences

Abstract

In many optical and precision engineering applications, low thermal distortion materials need to be bonded together reliably. Since high temperature bonding process ultimately introduce stresses in the bond, rendering it dimensionally instable, room temperature or near room temperature processes are preferred. Low thermal distortion materials such as silicon carbide and low thermal expansion glass ceramics are bonded at room temperature using hydroxide catalysis bonding with a silicate bonding material. The bonding procedure is explained and fracture toughness results are presented for SiC-SiC, Zerodur-Zerodur and SiC-Zerodur bonds. A surface treatment technique for hydrating the SiC surface is presented, which eliminates the need for pre-oxidized SiC surfaces when using HCB bonding. The bonds between surface treated bare SiC surfaces and thermally oxidized SiC surfaces are found to have comparable fracture toughness. © 2013 Elsevier B.V. All rights reserved.