Effect of Y2O3 Additive on Properties of Molten Salt-Assisted Synthesis of Al2O3-SiC Composite Powders and Resulting Ceramic Materials

doi:10.16552/j.cnki.issn1001-1625.2026.0068

Abstract

Abstract:

To further investigate the preparation process of Al₂O₃-SiC composite ceramics， Al₂O₃-SiC composite powder was successfully synthesized via a molten-salt-assisted method using silica fume， aluminum powder， and carbon black as raw materials， Y₂O₃ as the additive， and NaCl and KCl as the molten salt medium. The effects of synthesis temperature and Y₂O₃ content on the phase composition and microstructure were investigated. The results show that the principal crystalline phases are α-Al₂O₃ and β-SiC. With Y₂O₃ content increasing from 0% to 3%（mass fraction）， SiC whiskers are formed with lengths of 0.5 μm to 3.0 μm and diameters ranging from 20 nm to 70 nm. The growth mechanism study reveals that Y₂O₃ plays an important role in the formation of SiC whiskers， following a vapor-solid （V-S） growth mechanism. For the sample with 3%Y₂O₃ sintered at 1 500 ℃ for 4 h via pressureless sintering， the obtained Al₂O₃-SiC composite ceramic material exhibits a apparent porosity of 25.3%， a bulk density of 1.98 g·cm^-3， and a compressive strength of 16.4 MPa.

Key words: molten salt, composite powder, Y₂O₃, SiC whisker, vapor-solid growth mechanism

CLC Number:

TQ174

SUN Yijing, ZHENG Lijun, LUO Xudong, GAO Yimeng, QU Jiayin. Effect of Y₂O₃ Additive on Properties of Molten Salt-Assisted Synthesis of Al₂O₃-SiC Composite Powders and Resulting Ceramic Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(7): 2491-2498.

Figures/Tables 7

Table 1 Information of main raw materials

Name of raw material	Particle size/μm	Purity percentage of raw material/%	Manufacturer or distributor
Silica fume	0.1~0.3	≥93.00	Hebei Kexu Building Materials Co.， Ltd.
Carbon black	15.0	>99.00	Zhengzhou Xinke Chemical Products Co.， Ltd.
Aluminum powder	2.6	99.00	Gongyi Borun Refractory Materials Co.， Ltd.
Yttrium oxide	—	>99.99	Sinopharm Chemical Reagent Co.， Ltd.
Sodium chloride	—	99.50（AR）	Sinopharm Chemical Reagent Co.， Ltd.
Potassium chloride	—	99.50（AR）	Sinopharm Chemical Reagent Co.， Ltd.
Argon	—	99.00	Anshan Iron & Steel Labor Services （Anshan） Hongtai Low-temperature Equipment Co.， Ltd.

Fig.1 XRD patterns of composite powders synthesized from samples with 3% Y2O3 by holding temperature at 1 100 to 1 300 ℃ for 4 h

Fig.2 XRD patterns and phase relative content of composite powders with different Y2O3 content

Fig.3 SEM images and EDS spectrum of composite powders synthesized from samples with 3%Y2O3 at different temperatures for 4 h， and whisker size distribution histograms at 1 200 ℃ to 1 300 ℃

Fig.4 SEM images of composite powders synthesized from samples with different Y2O3 content by molten salt method at 1 300 ℃ for 4 h

Fig.5 Physical properties of composite ceramics synthesized with different Y2O3 content by holding at 1 500 ℃ for 4 h

Fig.6 Synthesis mechanism diagram of Al2O3-SiC composite powders synthesized by molten salt method with Y2O3 as additive

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Effect of Y₂O₃ Additive on Properties of Molten Salt-Assisted Synthesis of Al₂O₃-SiC Composite Powders and Resulting Ceramic Materials

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