Fabrication of SiC by carbothermal-reduction reactions of diatomaceous earth

Fabrication of SiC by carbothermal-reduction reactions of mountain leather asbestos

“…8a and b) that resemble the original asbestos, but under higher magnifications their porosity can be clearly seen ( Fig. 8c and d), similar to pictures seen for SiC obtained from sepiolite [10] and diatomaceous earth [11] at 1783 K and 1823 K, respectively. EDS analysis showed the presence of Si and Fe.…”

“…However, this procedure offers the possibility for an economically attractive production route of SiC powder from naturally occurring materials like Mg 6 Si 4 O 10 (OH) 8 . Many authors have studied the formation of SiC powders from the raw materials, such as high purity quartz sand [6][7][8], aluminosilicates [9], sepiolite [10] and diatomaceous earth [11]. It is known that the efficiency of the CRR process is improved with increasing total surface area of the reducing agent (i.e.…”

Porous ceramic monoliths based on diatomite

“…They posses pitted surface area with fine pores of dimensions ranging from the microto nanometer scale. According to the shape and morphology, diatoms belong to Aulacoseira type [25]. Fig.…”

Preparation of high-porous SiC ceramics from polymeric composites based on diatomite powder

“…This technology includes the following stages: production of polymeric composites based on phenol-formaldehyde resin and affordable silicon dioxide source-diatomite powder of ''Biosilica'' grade; pressing of samples (articles); thermal treatment of samples (articles) for resin carbonization with the subsequent carbothermal synthesis of silicon carbide. Diatomite powders were previously used [38][39][40][41][42][43][44][45][46][47] as SiO 2 sources for carbothermal production of SiC and Si 3 N 4 powders (at temperatures above 1450-1500°C), as well as for reduction by hydrogen or active metals; however, the challenge to develop the procedure, allowing preparation powders with the subsequent formation of porous ceramic articles within one cycle, was not formulated.…”