Study of thermal stability of fumed silica based thermal insulating composites at high temperatures

The effect of Al2O3 on the high‐temperature oxidation resistance of Si‐B‐C ceramic under air atmosphere

“…This complex group can improve melt viscosity because of the difficulty in migration for large ion clusters . Furthermore, Al 2 O 3 could also reduce volume shrinkage of SiO 2 , which was found by previous researches . In view of the self‐healing ability of the SiC f /Si‐B‐C composites mainly from the Si‐B‐C matrix, it is very important to study the modification of the Si‐B‐C ceramic matrix.…”

“…With the increase in Al 2 O 3 content, the crack size gradually decreases or even disappear, because of the reduced volume shrinkage of the oxidized layer as found by many previous researches. 16,17…”

“…15 Furthermore, Al 2 O 3 could also reduce volume shrinkage of SiO 2 , which was found by previous researches. 16,17 In view of the selfhealing ability of the SiC f /Si-B-C composites mainly from the Si-B-C matrix, it is very important to study the modification of the Si-B-C ceramic matrix. In this work, Al 2 O 3 is introduced into reaction-sintered Si-B-C ceramics as an oxidation product modifier for the improvement of the antioxidation ability of the material in high-temperature environment.…”

Fabrication of size-controlled SiC/Si3N4 ceramic microspheres with enhanced extinction property

“…Recently, non-oxide Si-based ceramics microspheres with controlled morphology and nano-or micro-meter size have attracted a great deal of attentions for their potential applications as the light-filler in high-temperature thermal insulation coating [6,7] and the infrared opacifier in inorganic aerogels [8][9][10][11]. Particularly, the particles with a diameter of 0.6-0.8 μm [12][13][14] can effectively block the IR radiation heat transfer, and therefore possess an excellent thermal insulating ability at high temperature.…”

Effects of Powder Additives on Thermal Shrinkage of Nanoporous Silica Insulation

“…It has many excellent properties, and especially its thermal insulating property is superior to other types of thermal insulations due to the nano-scale particle size (about 20 nm) [3][4][5]. Low thermal conductivity makes it a useful and basic material for thermal insulation [6]. The thermal conductivity of nanoporous silica thermal insulation is only 0.033 W/(m·K) under ambient conditions (25°C and atmospheric pressure).…”