Synthesis of hard and tough calcium stabilized α-sialon/SiC ceramic composites using nano-sized precursors and spark plasma sintering
| Autor: | Abbas Saeed Hakeem, Raja Muhammad Awais Khan, Moath Mohammad Al Malki, Tahar Laoui, Bilal Ahmed |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Sialon
Toughness Materials science 020502 materials Mechanical Engineering Metals and Alloys Spark plasma sintering chemistry.chemical_element 02 engineering and technology Calcium 021001 nanoscience & nanotechnology chemistry.chemical_compound Fracture toughness 0205 materials engineering chemistry Mechanics of Materials visual_art Materials Chemistry visual_art.visual_art_medium Silicon carbide Ceramic Composite material 0210 nano-technology Nano sized |
| Zdroj: | Journal of Alloys and Compounds. 757:200-208 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.05.062 |
| Popis: | Silicon carbide (SiC)-reinforced calcium (Ca)-α-sialon ceramic composites were synthesized using nano-sized precursors and spark plasma sintering at 1500 °C for 30 min by adding 10, 20 and 30 wt % of SiC particles into the sialon matrix. Almost complete densification was achieved for all processed samples. The second-phase SiC particles were found to be homogeneously dispersed in the α-sialon matrix. The effect of the amount of loaded SiC on the mechanical properties of the ceramic composites was studied. A remarkable combination of hardness and toughness values, specifically 24.53 GPa (HV10) and 11.0 MPa m1/2, respectively, was obtained for the composite ceramic containing 30 wt% SiC, whereas hardness and fracture toughness values of only 21.1 GPa (HV10) and 7.3 MPa m1/2, respectively, were obtained for the monolithic α-sialon ceramic. The increase in fracture toughness was fairly attributed to the crack deflection, crack bridging and grain pullout mechanisms caused by the finely dispersed SiC particles. |
| Databáze: | OpenAIRE |
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