SiC crystalline micro bullets on bio-carbon based charcoal substrate

Sethulakshmy Jayakumari,Per Erik Vullum,Antonius T.J Van Helvoort,Merete Tangstad

doi:10.1016/j.jcrysgro.2020.125740

Abstract

Silicon carbide (SiC) micro bullets were grown on a bio-carbon based charcoal substrate, the morphology and crystal structure were analyzed. In order to collect the crystallographic details scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM/TEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) were used. For this a thin lamella from the SiC micro bullet was extracted by focused ion beam (FIB). Electron microscopy revealed that the SiC micro bullets had a high density of stacking faults along their growth direction. However, the size and morphology of the micro bullets were relatively homogeneous, despite the high stacking fault density, i.e. the growth was quite robust at the synthesis temperature (1750 °C). The findings open up to SiC ceramics from bio-carbon with anisotropic porosity for the development of novel light weight high temperature resistant materials.

Highlights

Silicon carbide (SiC) is a non-oxide ceramic material with outstanding properties, which makes SiC an attractive material for many industrial applications [1]
Various synthesis methods are available for the synthesis of SiC, such as Acheson’s process, physical vapor deposition (PVD) and chemical vapor deposition (CVD) [3]
SiC ceramics from bio-carbon with anisotropic porosity are of increasing interest for the development of novel light weight high temperature resistant materials [4,5]

Summary

Introduction

Silicon carbide (SiC) is a non-oxide ceramic material with outstanding properties, which makes SiC an attractive material for many industrial applications [1]. SiC ceramics from bio-carbon with anisotropic porosity are of increasing interest for the development of novel light weight high temperature resistant materials [4,5]. Such light weight ceramics with low density and high strength and corrosion resistance are candidates for applications such as in filters, catalyst carriers, heat insulation structures, etc. SiC semiconductors in the shape of nanowires, nanorods, nanoneedles, nanotubes, and nanobelts as novel functional materials for nanoscale engineering have been envisaged [7] For such SiC nanostructures it is critical to control morphology and crystal phase, in order to achieve the desired properties [8]. In this study SiC micro bullets formed in bundles were formed on a biocarbon based charcoal substrate and morphology and crystal structure were analyzed

Experimental

Results and discussion

Conclusion