Selecting the Appropriate Carbon Source in the Synthesis of SiC Nano-Powders Using an Optimized Fuzzy Model

Malihe Zeraati,Ghasem Sargazi,Mahmood Barani,Parya Kazemzadeh

doi:10.1007/s12633-021-01082-8

Abstract

In this study, different sources of carbon in the synthesis of silicon carbide were evaluated using a multi-attribute group decision-making fuzzy model including IF-MAGDM method. In this model, the aim was to find the carbon precursor which has the minimum price, highest carbon content, good water solubility, lowest synthesis temperature, and the optimum crystallite size. Based on the results obtained from mentioned method, sugar was the best candidate. Therefore, sugar was selected as the efficient carbon source in the synthesis of SiC, also tetraethyl ortho-silicate was used as the source of silicon. The synthesis temperature was 800 °C, which is a relatively low temperature for the synthesis of crystalline SiC. To optimize the carbothermal process, microwave heating and just 15 min were enough to form crystalline SiC nanostructures. Various analyses were used for efficient characterize of the products. TGA-DTA were used to investigate thermal behaviours of the samples. XRD results showed that the SiC powder prepared by microwave heating was fully crystalline phases. FE-SEM and TEM analyses showed the nanometric nature in average particle size distributions of products with a flake-like morphology.

Highlights

Final properties of SiC ceramics and coatings largely depend on the characteristic of the starting raw materials and precursors
Sugar was selected as carbon source in the synthesis of SiC, tetraethyl ortho-silicate (TEOS) used as source of Silicon
Sol-Gel process has been established as a novel method for nano-powders synthesis with several outstanding features including, high purity [5], high chemical activity, enhancing powder sinterability, and the possibility for materials mixing at the molecular scale

Summary

Introduction

Final properties of SiC ceramics and coatings largely depend on the characteristic of the starting raw materials and precursors. The production of high-performance SiC ceramics requires ultrafine and pure SiC powders. To produce such an ultrafine and pure SiC powder, a number of alternative techniques, such as sol-gel method [1], thermal decomposition of silane compound [2, 3] and chemical vapor deposition [4], have been developed to eliminate the limitation of conventional Acheson process. Sol-Gel process has been established as a novel method for nano-powders synthesis with several outstanding features including, high purity [5], high chemical activity, enhancing powder sinterability, and the possibility for materials mixing at the molecular scale.

Methods

Results

Conclusion