Shear and Bending Strength of SiC/SiC Joined by a Modified Commercial Adhesive

Abstract

The aim of this work was to develop a new joining/repairing material suitable to be easily applied at temperature not exceeding 300°C, in air atmosphere, on large surfaces of SiCf/SiC composites for aerospace applications. The joining/repairing material proposed here is based on a Carbon Fiber‐reinforced commercial Adhesive (CFA) where silicon carbide particles were added. Mechanical strength of the joined SiC/SiC was tested before and after heat treatment at the maximum working temperature for these SiC/SiC. Flexural strengths higher than 200 MPa and 90 MPa, before and after heat treatment, respectively, were obtained by coupling mechanical and adhesive bonding techniques.

Solidification of welded SiC–ZrB2–ZrC ceramics

“…The three phases observed in the Figure 1 backscattered electron image (BEI), were identified as SiC (black), ZrB 2 (medium gray), and ZrC (light gray). Each phase was confirmed through XRD (included with further solidification discussion) of a ground PM specimen to be a-SiC (6H), 34 ZrB 2,35 and ZrC. 36 The SZZ PM was able to be machined with wire electric discharge machining (EDM), and it was determined that if the PM was sufficiently conductive for wire EDM, then it would be amenable to arc welding.…”

“…From armor to jet engine components, silicon carbide (SiC) receives wide attention as a structural ceramic due to its strength, hardness, and chemical durability . Due to the inherent brittleness of monolithic ceramics, SiC fibers (SiC f ) are often used as a reinforcement to produce SiC f ‐reinforced SiC matrix (SiC f /SiC) composites, increasing damage tolerance .…”

“…From armor to jet engine components, silicon carbide (SiC) receives wide attention as a structural ceramic due to its strength, hardness, and chemical durability. [1][2][3] Due to the inherent brittleness of monolithic ceramics, SiC fibers (SiC f ) are often used as a reinforcement to produce SiC freinforced SiC matrix (SiC f /SiC) composites, increasing damage tolerance. [4][5][6] The improved mechanical properties combined with the chemical inertness, high-temperature capabilities, and high-neutron irradiation tolerance of SiC make SiC f /SiC composites a high priority material for use in next generation nuclear reactors.…”

Preparation and Performance of the Room‐Temperature‐Cured Heat‐Resistant Phosphate Adhesive for C/C Composites Bonding

“…In most cases, the fabrication and repair of C/C composites need to be performed onsite under a wide variety of field assembly and maintenance conditions . Thereby, a relative low‐temperature joining method without destroying C/C substrates can facilitate the fabrication and repair of large structures onsite.…”

“…20 In most cases, the fabrication and repair of C/C composites need to be performed onsite under a wide variety of field assembly and maintenance conditions. 21 Thereby, a relative low-temperature joining method without destroying C/C substrates can facilitate the fabrication and repair of large structures onsite. The adhesive bonding is the most promising method because it can join the C/C composites at low temperature and the joints can be applied at high temperature.…”