ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty


EFFECTS OF THE AMOUNT OF STARCH AND THE HOLDING TIME ON THE SYNTHESIS OF SiC-TiC COMPOSITE POWDERS
 
Hu Jilin, Cao Yu, Liu Xin, Zhu Ling, Li Jing, Wen Jin, Peng Yangxi, Chen Zhanjun
 
Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China

Keywords: Influence, Carbothermal reduction method, Silicon carbide, Titanium carbide, Preparation
 

SiC-TiC composite powders were synthesised through carbothermal reduction under an argon atmosphere by using silica sol, starch, and TiO₂ as the raw materials. The influences of the starch dosage and holding time on the synthesis of SiC-TiC composite powder are discussed in detail. The samples were characterised using an X-ray diffractometer (XRD), an integrated thermal analyser (TG-DTA), a scanning electron microscope (SEM), and an energy spectrometer (EDS). The results showed that the SiC-TiC composite powders were completely synthesised after holding at 1550 °C for 3 h when the amount of excess starch was 5 wt% and after holding at 1550 °C for 2 h when the amount of excess starch was 10 wt%-20 wt%. The morphological characteristics of the powder samples with 5 wt%-15 wt% excess starch calcined at 1550 °C for 2 h were mainly flake particles, spherical particles, irregularly shaped particles and elongated whiskers. Conversely, no whiskers were found in the powder samples calcined at 1550 °C for 2 h when the amount of excess starch was 20 wt%.


doi: 10.13168/cs.2021.0040
 
 
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