Effect of MgCl2 addition on the preparation of ZrC–SiC composite particles by sol-gel

Zheng, Lei; Fang, Cunqian; Luo, Xiao; Zhang, Ze; Zhang, Mingyu; Huang, Qizhong

doi:10.1016/j.ceramint.2021.10.034

Cited by 8 publications

(2 citation statements)

References 40 publications

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“…Although a large part of the ceramic industry is made up of traditional or silicate ceramics, new ceramics with various properties and applications have been developed in recent decades. These ceramics have unique properties such as high thermal and chemical resistance and good mechanical properties [1][2][3][4][5][6]. Ceramic carbides are an important category of ceramic products.…”

Section: Introductionmentioning

confidence: 99%

Exploring the impact of pH and temperature on TiC nanopowders syntesized via sol-gel and subsequent crystallization by carbothermal reduction method

Morshed,

Najafi,

Khalaj

2024

Phys. Scr.

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In the present study, titanium carbide powders with suitable morphology and nanometer particle size were synthesized by the sol-gel method to investigate the parameters affecting the properties of sol and the final powder. The initial sol was prepared in a four-component system of alkoxide-water-alcohol-citric acid based on the chemical process of sol-gel. study of sol properties showed that pH was the most important factor in the control of sol conditions and particle size so that at low pHs, due to low concentration of OH- ions and reduced viscosity, it was easier to control the particles size. Accordingly, the results of the Dynamics Light Scattering (DLS) showed that at low pHs, the particles size was below 10 nm. According to the zeta potential diagram and by examining the conditions of sol at different pHs, 4.5 was determined as the optimal pH and to prevent the bonding of particles within the sol, ammonium polycarboxylate dispersant was used. The temperature at which particles were formed was determined using Differential thermal analysis (DTA) and Thermal gravimetric analysis (TG). X-ray diffraction (XRD) patterns showed the presence of a completely amorphous phase at 700˚C. It was also observed that with increasing temperature, TiC crystallization started from 1200˚C and ended at 1400˚C. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) micrographs at 1400˚C showed the completely spherical morphology of particles of nanometer size so that no agglomerate was observed.

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Section: Introductionmentioning

confidence: 99%

Exploring the impact of pH and temperature on TiC nanopowders syntesized via sol-gel and subsequent crystallization by carbothermal reduction method

Morshed,

Najafi,

Khalaj

2024

Phys. Scr.

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“…ZrC-SiC composites are considered to be the most attractive heat-resistant structural materials due to their excellent comprehensive properties in chemical stability, high-temperature strength, oxidation resistance, and thermal shock resistance, which can replace iron, nickel, cobalt-based superalloys, and their intermetallic compounds for use in the aerospace industry and in aerospace structural components. To improve the oxidation and ablation resistance, the density of the ZrC-SiC ceramic matrix composites must be increased, and the content of harmful elements needs to be reduced [12].…”

Section: Introductionmentioning

confidence: 99%

SYNTHESIS AND MECHANISM OF SiC-ZrC COMPOSITE POWDERS BY CARBOTHERMAL REDUCTION METHOD

Cao¹

2022

Ceramics - Silikaty

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SiC-ZrC composite powders were synthesised by the carbothermal reduction method using starch as the carbon source, zirconium dioxide as the zirconium source, and silica sol as the silicon source. The effects of the reaction temperature on the phase composition and microstructure of the SiC-ZrC composite powders were investigated. The reaction process was thermodynamically analysed and calculated, and the synthesis mechanism of the SiC-ZrC composite powder was analysed. The synthesised powder samples were characterised and analysed by X-ray diffraction, scanning electron microscopy, and other testing methods. The results show that the optimum reaction condition for the synthesis of SiC-ZrC composite powders is at 1550 °C-1600 °C for 1.5 h. A high temperature and a low pressure are beneficial in conducting the synthesis reaction. The SiC-ZrC composite powders synthesised by calcining at 1550 °C and holding for 1.5 h are mainly composed of a certain amount of whiskers, spherical particles, floc particles, and other structures. Moreover, their grain size is small (100-200 nm). The powder samples synthesised at 1600 °C produced a larger number of whiskers. The length of the whiskers was mostly 10 μm, the arrangement was complex and irregular, and a diverse microstructure was formed.

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Microstructure, mechanical and anti-ablation properties of Mg-modified C/C–ZrC–SiC composites prepared by sol-gel technology

Zheng

Fang²,

Luo³

et al. 2022

Ceramics International

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Effect of MgCl2 addition on the preparation of ZrC–SiC composite particles by sol-gel

Cited by 8 publications

References 40 publications

Exploring the impact of pH and temperature on TiC nanopowders syntesized via sol-gel and subsequent crystallization by carbothermal reduction method

Exploring the impact of pH and temperature on TiC nanopowders syntesized via sol-gel and subsequent crystallization by carbothermal reduction method

SYNTHESIS AND MECHANISM OF SiC-ZrC COMPOSITE POWDERS BY CARBOTHERMAL REDUCTION METHOD

Microstructure, mechanical and anti-ablation properties of Mg-modified C/C–ZrC–SiC composites prepared by sol-gel technology

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