Improved sintering ability of SiC ceramics from SiC@Al2O3 core-shell nanoparticles prepared by a slow precipitation method. Issue 6 (15th April 2019)

• Record Type: Journal Article
• Authors: Liu, Yiteng; Liu, Rongzheng; Liu, Malin
• Is Part Of: Ceramics international. Volume 45:Issue 6(2019)
• Page Start: 8032
• Page End: 8036
• Publication Date: 2019-04-15
• Subjects: Silicon carbide -- Sintering -- Slow precipitation method -- Core-shell nanostructure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.01.023
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: SiC@Al2 O3 composite nanoparticles with core-shell structure were prepared by a slow precipitation method, aimed at improving the sintering ability of SiC. SiC nanoparticles with average particle size of 100 nm were prepared by a fluidized bed-chemical vapor deposition (FB-CVD) method. The Al(OH)3 coating was formed by slow precipitation of aluminum nitrate in urea solution. The coating layer was then transformed to Al2 O3 after further heat treatment. By controlling the rate of urea hydrolysis and the aluminum nitrate concentration in the solution, the thickness of the coating layer could be adjusted. The results of X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM) and Energy Dispersive Spectrometer (EDS) indicated that Al2 O3 was uniformly coated on the surface of SiC particles and the two phases were closely contacted. The improved sintering ability of SiC@Al2 O3 composite nanoparticles were validated, and better mechanical properties were obtained compared with the sintering results using the conventional ball milling method.