On Strengthening of Epoxy-Composites by Filling with Microdispersions of SiC, TiN, and Cement

Scientific foundations of solving engineering tasks and problems

“…Another example of thermal hardening and thermal plasticization (elimination of unwanted brittleness) is observed for compositions of epoxy with water-bindersgypsum G5 and cements M400-M500 (table 4). These effects were recorded and published by us in works [118,124,126,130]. After 250 ° C, the compressive strength of composites with the neat (non-hydrated) cement almost does not change, and with pre-cured it increases, while the unfilled polymer noticeably (by one third) loses its strength.…”

“…In 2017, Starokadomsky first published a work with a cursory description of a new interesting effect -hardening of an epoxy composite with micro-iron [119] after destructive heating of the composite. This effect looked strange and even artifact, but later it was observed on epoxy composites with silicates [118], gypsum [118,124] and carbide [126,130] fillers. Thus, we are talking about a phenomenon that allows the creation on the basis of conventional (non-heatresistant) polymer components of epoxy composites with high durability (and even hardening & strengthening) of their characteristics in the "hot" range of 250  350 °C, which is uncharacteristic for plastics (even standard epoxy plastic).…”

Structure and characteristics of epoxy composites with microdispersed cement filler

“…Следует отметить, что эти данные согласуются с ранее нами полученными данными испытаний эпоксидных композитов, наполненных микро-наножелезным наполнителем [17], а также с наполнителями SiC и TiN [8,10]. Полученный эффект мы назвали «термической закалкой» (или «высокотемпературным упрочнением») эпоксидных композитов.…”

“…[4]. Сейчас известен ряд информативных работ, статей и диссертаций по данной теме [5][6][7][8][9][10][11][12][13][14][15][16], в том числе и наши ранее опубликованные работы [7][8][9][10]. Но основной вопрос -что же конкретно происходит, когда цемент «входит» в эпоксидную смолу, так и остаётся на сегодняшний день весьма интересным и мало освещённым сегментом науки о пластических массах.…”

Microfilled Epoxy-Composites, Capable of Thermo-Hardening and Thermo-Plasticization After Hard Heating (200-300 ОC) - For “in-Field\Offroad” Use in Bio-, Agro-, Medservice

“…Epoxyresin can be filled to practically all dispersions in order to her high adhesion to any surfaces (except fat and silicon). Already 30-40 syear such fillers come forward the hit of the following as silica [10] microspheres, carbon (CNT, Graphene [8]) , carbide [12][13][14], nitride [15,16], metals [9,17]…”