Processing, Mechanical Characterization, and Alkali Resistance of SiliconBoronOxycarbide (SiBOC) Glass Fibers

Abstract

A borosilicate sol-gel solution is synthesized using a mixture of methyltriethoxysilane, dimethyldiethoxysilane, and boric acid. SiBOC gel fibers are produced from the as-synthesized sol-gel solution using a spinning apparatus. Subsequently, SiBOC glass fibers are prepared through pyrolysis under argon atmosphere at 1000°C and 1200°C. Mechanical properties of the SiBOC glass fibers are studied by measuring the tensile strength and the elastic modulus. The results show a high tensile strength -1300 and 1058 MPa, and a high Young modulus -79 and 95.5 GPa, for the fibers prepared at 1000°C and 1200°C, respectively. Furthermore, alkali resistance of the SiB-OC fibers is investigated by measuring the tensile strength after soaking them for 20 h in NaOH and Ca(OH) 2 solutions at 100°C. For comparison, the same measurements are performed on commercial AR and E glass fibers. The SiBOC fibers show excellent alkaline resistance and perform better than commercial AR fibers. Indeed, SiBOC fibers retain 80%-90% of the initial strength after Ca(OH) 2 attack.

Silicon oxycarbide glasses and glass‐ceramics: “All‐Rounder” materials for advanced structural and functional applications

“…A first attempt to produce SiOC fibers was performed by Hurwitz in the late 1980s upon melt spinning of a polysilsesquioxane . SiOC and SiBOC preceramic fibers were also produced from a combined sol‐gel synthesis approach as well as from polymer solutions…”

N-doped polymer-derived Si(N)OC: The role of the N-containing precursor

“…33 The spectrum also displays the peaks at 117. 6 Fig. 2(b) shows the Si units in the starting precursor at the chemical shifts of À35.6 ppm (O 2 SiCH) and 10.1 ppm (C 3 SiO).…”

“…2 The nanostructure of SiOCs is made up of an amorphous silicon oxycarbide network of mixed SiC 4Àx O x , 0 # x # 4, tetrahedra and a free carbon phase. 3,4 Such a unique nanostructure conveys to these materials an exceptional mix of properties combining high elastic modulus and excellent chemical durability, [5][6][7] with optical, 8 electrochemical, 9 and electrical properties 10 which make SiOCs good candidate materials for LED, 11 anodes for Li-ion batteries 12,13 and pressure and temperature sensors for harsh environments, 14 respectively. The amount and structure of the free carbon phase of silicon oxycarbides have been shown to influence many different properties such as the stability of the amorphous network and its crystallization kinetics, 15 the electrical 16,17 and optical properties, 18 as well as the Li storage capacity when SiOCs are used as anodes for Li-ion batteries.…”

Polymer-Derived Boron Nitride: A Review on the Chemistry, Shaping and Ceramic Conversion of Borazine Derivatives

“…The intermediate curing step results in an increased cross-linking of the polymer and hence in the formation of an infusible polymer fiber necessary for the shape retaining thermal conversion into the ceramic material. Many examples of polymer-derived ceramic fibers have been reported through reviews or specific articles [ 25 , 26 , 28 , 29 , 36 , 37 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 ], in particular on BN fibers by our group [ 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 ].…”