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

Hydroxide catalysis bonding for astronomical instruments

“…Preston and Mueller [19] showed, however, that successful bonds can be created between SiC substrates without the use of an additional oxide layer. Van den Ende and Gubbels [17] showed that the fracture toughness of SiC-SiC bonds cleaned with 0.1 M NaOH solution (pH 13) in demineralized water, heated to 35°C for 4 h, is the same within error as SiC-SiC bonds with thermally oxidised surfaces (78 nm thick), which suggests hydrogen formation is not a problem for SiC-SiC bonds. Table 1 shows consistently lower shear strength results than tensile results.…”

“…Van den Ende and Gubbels [17] address the stress concentration issue by measuring the fracture toughness of HCBs between SiC and Zerodur instead of strength, and deliberately introduce high stress concentrations into the edge of the bonds. They found the fracture toughness of HCBs to be higher than 1 MPa m -1/2 .…”

Build a Rigid–Flexible Graphene/Silicone Interface by Embedding SiO2 for Adhesive Application

“…Silicone has gained increasing attention due to its radiation resistance, excellent electrical insulation, , thermal oxidative stability, corrosion resistance, superior fatigue resistance under extreme temperatures, fracture toughness, and so on. Thus, there is a wide range of industrial applications .…”

Preparation and Characterization of Ultra-Fine Oil Palm Ash Powder by Ultrasonication and Alkaline Treatment for Its Evaluation as Reinforcing Filler in Natural Rubber

“…This caused the erosion and silicate dissolution at the surface of the OPA particles, resulting in more larger pore structure appearance on the surface of the 1M and 2M NaOH-treated OPA, as can be seen in Figure 5 b,c respectively. However, at higher concentrations of NaOH solution, the ionic strength and concentration increased leading to deeper penetration by OH − ions into the agglomerates which ionized the inner ☰Si-O-Si☰ bonds [ 32 , 33 ] resulting in a product which could be further hydrolyzed to form a silanol group on the particle surface as described below: …”