期刊
CERAMICS INTERNATIONAL
卷 47, 期 20, 页码 28218-28225出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.06.235
关键词
Si3N4-SiC/SiO2; 3D printing; Sol infiltration; Heat treatment; Mechanical properties
资金
- Guangdong Basic and Applied Basic Research Foundation [2019B1515120001]
- National Natural Science Foundation of China [11902104]
- STU Scientific Research Foundation for Talents [09419030]
- Fundamental Research Foundation for Universities of Heilongjiang Province [JMRH2018XM01]
Si3N4-SiC/SiO2 composites were successfully prepared using SLS and infiltration processes, leading to significant improvement in flexural strength. By optimizing the manufacturing process and material compositions, a composite part with complex structure was manufactured, showing promising application potential.
Si3N4-SiC/SiO2 composites were prepared by employing three-dimensional (3D) printing using selective laser sintering (SLS) and infiltration processing. The process was based on the infiltration of silica sol into porous SLS parts, and silicon carbide and silicon nitride particles were bonded by melted nano-sized silica particles. To optimize the manufacturing process, the phase compositions, microstructures, porosities, and flexural strengths of the Si3N4-SiC/SiO2 composites prepared at different heat-treatment temperatures and infiltration times were compared. Furthermore, the effects of the SiC mass fraction and the addition of Al2O3 and mullite fibers on the properties of the Si3N4-SiC/SiO2 composites were investigated. After repeated infiltration and heat treatment, the flexural strength of the 3D-printed Si3N4-SiC/SiO2 composite increased significantly to 76.48 MPa. Thus, a Si3N4-SiC/SiO2 composite part with a complex structure was successfully manufactured by SLS and infiltration processes.
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