Improving Pressure–Velocity Limit of Mechanical Seal with Polycrystalline Diamond Coating
| Autor: | Guoping Wu, Shouhong Tan, Nan Jiang, Cai Ningning, He Li, Fangmin Xie, Guo Daidong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
polycrystalline diamond coating 02 engineering and technology Chemical vapor deposition engineering.material lcsh:Technology Seal (mechanical) PV limit lcsh:Chemistry chemistry.chemical_compound symbols.namesake harsh conditions 0203 mechanical engineering Coating friction coefficient Silicon carbide General Materials Science Graphite Composite material lcsh:QH301-705.5 Instrumentation Fluid Flow and Transfer Processes lcsh:T Process Chemistry and Technology General Engineering Diamond 021001 nanoscience & nanotechnology lcsh:QC1-999 Grain size Computer Science Applications 020303 mechanical engineering & transports lcsh:Biology (General) lcsh:QD1-999 chemistry lcsh:TA1-2040 mechanical seal engineering symbols lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology Raman spectroscopy lcsh:Physics |
| Zdroj: | Applied Sciences Volume 10 Issue 17 Applied Sciences, Vol 10, Iss 6090, p 6090 (2020) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app10176090 |
| Popis: | Polycrystalline diamond (PCD)-coated mechanical seal rings were prepared by hot filament chemical vapor deposition (HFCVD) on graphite-loaded silicon carbide (GSiC) substrates. From the initial deposition process, the diamond first nucleated and then grew into a dense coating with grain size of 4 &mu m and thickness of 12.3 &mu m. The well-grown PCD coating, as confirmed by Raman spectroscopy and X-ray diffractometry, significantly improves the pressure&ndash velocity limit of the mechanical seal applied in harsh operating conditions, no matter whether for a hard-to-soft mating combination or a hard-to-hard mating combination. Comparing GSiC against sintered silicon carbide (SSiC) combination (GSiC/SSiC), GSiC against graphite combination (GSiC/graphite) and PCD against graphite combination (PCD/graphite), PCD against SSiC combination (PCD/SSiC) shows the highest pressure velocity (PV) limit of 42.31 MPa· m/s with 4 kN loading at 4500 rpm rotation speed. An extremely low and stable friction coefficient and super mechanical properties under harsh conditions can be approved as the source of the high PV limit of PCD coating. A mechanical seal with PCD coating can be used for more demanding applications. |
| Databáze: | OpenAIRE |
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