Role of carbon nanotubes on mechanical properties of SiC-B4C-Ni hybrid composites fabricated by reactive spark plasma sintering
| Autor: | M. Bahamirian, Leila Nikzad, Mohammad Hasan Barounian, Fardin Alipour, Raouf Behjat Golenji, Mansour Razavi |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Spark plasma sintering 02 engineering and technology Carbon nanotube 021001 nanoscience & nanotechnology 01 natural sciences Indentation hardness Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Fracture toughness Flexural strength law Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites Relative density Composite material 0210 nano-technology Shrinkage |
| Zdroj: | Ceramics International. 47:25221-25228 |
| ISSN: | 0272-8842 |
| Popis: | The present study was conducted to investigate the microstructural and mechanical properties of SiC-45 vol%B4C-10 vol%Ni and SiC-45 vol% B4C-10 vol%Ni-5vol% CNT in-situ composites fabricated through reactive spark plasma sintering (SPS) method at 1650 °C for 5 min. The phase and microstructural characterization of the composites were evaluated utilizing x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Ultimately, microhardness, flexural strength, and fracture toughness of the composites were measured. Densification behavior of the samples revealed that the initial shrinkage of the composites took place at about 750 °C, which is related to the reaction between Ni and SiC phases. XRD results confirmed the formation of Ni2Si phase. The relative density of 98.3 ± 0.32% was achieved for the SiC-B4C-10Ni sample; this value was 97.8 ± 0.62% for the SiC-B4C-10Ni-5CNT sample. The flexural strength of 362 ± 23 MPa was achieved for the SiC-B4C-10Ni sample; this value was 369 ± 15 MPa for the SiC-B4C-10Ni-5CNT sample. The comparison between the fabricated composites concerning the fracture toughness indicated further fracture toughness of the SiC-B4C-10Ni-5CNT sample (5.82 ± 0.32 MPa m1/2) than that of the SiC-B4C-10Ni sample (3.35 ± 0.56 MPa m1/2). Formation of micro-cracks, crack path deflection, and CNT bridging was the main toughening mechanisms in the SiC-B4C-10Ni-5CNT sample. |
| Databáze: | OpenAIRE |
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