In situ synthesis of SiC nanowire porous layer on carbon/carbon composites

Abstract

SiC nanowire porous layer was synthesized in situ by a simple two‐step technique involving slurry painting and high temperature heat‐treatment without catalyst assist. The proposed method is effective and low‐cost, which can prepare plentiful and high‐purity SiC nanowires (SiCNWs). The microstructure of SiCNWs and the effects of heat‐treatment temperatures on the synthesis of SiCNWs were investigated in detail. Results show that the as‐synthesized NWs consisted of 3C–SiC, with the length of up to several hundred micrometers and the diameter of 50‐100 nm at 1500°C. Meanwhile, the diameter of SiCNW increases with the increasing of heat‐treatment temperature. The growth process of the SiCNWs can be controlled by the vapor‐solid growth mechanism. After introducing SiCNWs into the SiC coating prepared by pack cementation, the elastic modulus of the nanowire‐toughened SiC coating was increased by 35% compared to SiC coating without SiCNWs.

Study on mechanisms of microwave synthesis of SiC crystal from sheet carbon source

“…With these unique properties, SiC can be used not only in abrasive tools, refractories and high-temperature structural ceramics [4][5][6], but it is also an ideal choice for electronic devices, electronics in harsh environments, blue light-emitting diodes, sensors and heterogeneous catalyst carriers [7][8][9]. Additionally, it is often used as a reinforcement material to improve the properties of composites [10]. Moreover, needle-like SiC whisker is a good candidate for field emission device, which has substantial electron emission stability, high flexibility, excellent mechanical and electrical robustness [11,12].…”

First-principles calculation of atomic structure, stability and electronic structure of TaB2/SiC interface

“…Carbon materials, especially carbon fiber reinforced carbon matrix (C/C) composite materials, with unique advantages of low density, low thermal expansion coefficient (CTE), high strength, high thermal conductivity and structural stability, are considered as the most promising thermal structure material and have aroused special interests in aeronautic and aerospace fields [1][2][3][4][5], such as hypersonic vehicles and rocket propulsion systems. However, the application of [26] 3 .083 3.244 Calc.…”

First-principles calculation of atomic structure, stability and electronic structure of TaB2/SiC interface

“…Carbon materials, especially carbon fiber reinforced carbon matrix (C/C) composite materials, with unique advantages of low density, low thermal expansion coefficient (CTE), high strength, high thermal conductivity and structural stability, are considered as the most promising thermal structure material and have aroused special interests in aeronautic and aerospace fields [1][2][3][4][5] , such as hypersonic vehicles and rocket propulsion systems. However, the application of C/C composites facing huge challenges due to its sensitivity to the oxidants at a temperature higher than ~723K [6,7] .…”