Decreasing Resistivity of Silicon Carbide Ceramics by Incorporation of Graphene
| Autor: | Guo Daidong, Fangmin Xie, Shouhong Tan, Nan Jiang, Guoping Wu, He Li, Cai Ningning |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
bulk density Seal (mechanical) lcsh:Technology Article law.invention chemistry.chemical_compound Thermal conductivity Flexural strength law Electrical resistivity and conductivity Silicon carbide General Materials Science Ceramic Composite material lcsh:Microscopy Triboelectric effect lcsh:QC120-168.85 SiC ceramics lcsh:QH201-278.5 Graphene lcsh:T graphene chemistry lcsh:TA1-2040 volume resistivity flexural strength visual_art visual_art.visual_art_medium lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials Volume 13 Issue 16 Materials, Vol 13, Iss 3586, p 3586 (2020) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13163586 |
| Popis: | Silicon carbide (SiC) ceramic is an ideal material for mechanical seal because of its super hardness, high strength, low friction coefficient, good thermal conductivity, and resistance to friction and wear. However, due to relatively high resistivity of SiC ceramic, the triboelectric charge caused by rubbing of mechanical seal end-faces could not be released. It is terrible that the accumulation of triboelectric charge could cause electrochemical corrosion, which would accelerate wear. To decrease the resistivity of SiC ceramic is a desire for improving the performance of mechanical seal. In this research, decreasing resistivity of pressureless sintered SiC ceramic was investigated by conductive pathways through semiconductive grains in a body by incorporation of graphene, which has an extremely low resistivity. With the increasing of graphene from 0 to 2 wt.%, the volume resistivity of SiC ceramics sintered with graphene decreased logarithmically from > 106 to around 200 &Omega · cm, and the bulk density decreased gradually, from 3.132 to 3.039 g/cm3. In order to meet the requirements of mechanical seal, SiC ceramic sintered with 1 wt.% of graphene, for which the volume resistivity is of 397 &Omega cm, the bulk density is of 3.076 g/cm3, and the flexural strength is of 364 MPa, was optimized when all properties were taken into consideration. It is possible to fabricate low-resistivity SiC ceramic as a useful friction pair material for mechanical seal in a special condition, without excessive loss of their excellent mechanical properties by the introduction of partially connected graphene as conductive pathway into semiconducting ceramic. |
| Databáze: | OpenAIRE |
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