Fabrication of Nano Silicon Carbide Using Microwave Heating of Coal Tar Pitch

Abstract

Silicon carbide (SiC) is an important device material for the 5G communication era In this study coal tar pitch and fumed silica are used as raw materials to prepare the SiC through microwave heating From the SEM observation the type of SiC products consist of nanowires and nanoparticles XRD results showed that the 2θ values present at 35 7° 60 0° and 71 8° which are typical characteristic diffraction peaks of β-SiC crystals In addition the characteristic peak of SiC in FTIR is presented at 797cm-1 which is the characteristic absorption peak of Si-C bonding The above results show that nano-silicon carbide material was successfully manufactured by using cheap raw materials and high-efficiency green energy The crystallinity of SiC prepared by microwave heating is higher than conventional heating from XRD and FTIR measurements From SEM XRD and FT-IR results the yield of SiC produced by microwave heating controlled at 1200°C is lower than 1450°C Furthermore this study also manipulates the ratio of pitch: silica = 3:1 5:1 and 7:1 to manufacture SiC by microwave oven The results show that as the carbon content increases the less silica remaining in the product the greater the conversion of carbon and higher yield of SiC High purity of SiC nanowire can be obtained through the liquid phase separation process By using electroless plating of nickel on silicon carbide nanowire this study can obtain a high thermal conductivity product

Date of Award	2020
Original language	English
Supervisor	Chuh-Yung Chen (Supervisor)