کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1579395 1514825 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructures and mechanical properties of spark plasma sintered Al–SiC composites containing high volume fraction of SiC
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Microstructures and mechanical properties of spark plasma sintered Al–SiC composites containing high volume fraction of SiC
چکیده انگلیسی

Al–SiC ceramic–matrix composites containing high volume fraction of SiC were synthesized by spark plasma sintering (SPS) technique with sintering temperatures ranging from 1500 °C to 1800 °C, a pressure of 50 MPa, and a heating rate of 150 °C/min, using Al and SiC powders. Microstructures and mechanical properties of the composites sintered at different temperatures were investigated. Results reveal that the Al–SiC composites synthesized by SPS process consist of Al, SiC, Si, and Al4C3 phases. The volume fraction of Al4C3 and Si phases in the composites were reduced remarkably with increasing the sintering temperature up to 1700 °C. As a result, the composite sintered at 1800 °C provides the optimal combination of dense microstructures and excellent properties, including the relative density of 99.6%, micro-hardness of 25.5 GPa, bending strength of 451 MPa, and fracture toughness of 6.05 MPa m1/2. Compared with the monolithic SiC ceramics, both the bending strength and the fracture toughness of the composites are improved due to the dense microstructures, fine SiC grains, and infiltration of the molten Al into the interfaces of the SiC grains.

Research highlights▶ Al–SiC composites containing high volume fraction of SiC were synthesized by SPS. ▶ The Al–SiC composites synthesized by SPS consist of Al, SiC, Si, and Al4C3 phases. ▶ The volume fraction of Al4C3 and Si phases decreased with increasing temperature. ▶ The composite sintered at 1800 °C exhibits dense microstructures and good properties. ▶ The fracture toughness of the composite sintered at 1800 °C is 6.05 MPa m1/2.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 527, Issues 27–28, 25 October 2010, Pages 7235–7240
نویسندگان
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