Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication
Abstract
:1. Introduction
2. Materials Prepareds and Methods Applied
2.1. Materials Prepared and Specimens Made
2.2. Test Methods
3. Findings and Discussion
3.1. Characteristics of Friction and Wear
3.2. Characterization of the Worn Surfaces with SEM
3.3. XPS Analysis on the Worn Surfaces
3.4. Characterization of Seawater Lubrication
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Specimens | Density (g/cm3) | Porosity (%) | Bending Strength (MPa) | Vickers Hardness (GPa) | Fracture Toughness (MPa·m1/2) |
---|---|---|---|---|---|
SN10 | 3.10 | 0.91 | 613 | 15.3 | 7.14 |
Specimens | Density (g/cm3) | Tensile Strength (MPa) | Bending Strength (MPa) | Rockwell Hardness (GPa) | Impacting Energy (J) |
---|---|---|---|---|---|
GCr15 | 7.81 | 1902 | 1617 | 63 | 26 |
Grade | Components (wt%) | ||||||
---|---|---|---|---|---|---|---|
C | S | Si | P | Mn | Ni | Cr | |
GCr15 | 0.95 | ≤0.020 | 0.27 | ≤0.027 | 0.36 | ≤0.30 | 1.49 |
Constituent | Concentration (g/L) |
---|---|
NaCl | 24.53 |
MgCl2 | 5.20 |
Na2SO4 | 4.09 |
CaCl2 | 1.16 |
KCl | 0.695 |
NaHCO3 | 0.201 |
KBr | 0.101 |
H3BO3 | 0.027 |
SrCl2 | 0.025 |
NaF | 0.003 |
Tribopair | Conditions | Tribo-Chemical Products | Wear Mechanisms |
---|---|---|---|
SN10/GCr15 | seawater | SiO2, B2O3, Fe2O3, FeO, CaCO3, Mg(OH)2 | hydrodynamic lubrication, boundary lubrication |
SN10/GCr15 | dry friction | SiO2, H3BO3, Fe2O3 | adhesive wear, abrasive wear |
SN10/GCr15 | pure water | SiO2, B2O3, Fe2O3, FeO | hydrodynamic lubrication |
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Han, F.; Wen, H.; Sun, J.; Wang, W.; Fan, Y.; Jia, J.; Chen, W. Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication. Materials 2020, 13, 635. https://doi.org/10.3390/ma13030635
Han F, Wen H, Sun J, Wang W, Fan Y, Jia J, Chen W. Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication. Materials. 2020; 13(3):635. https://doi.org/10.3390/ma13030635
Chicago/Turabian StyleHan, Fang, Huaixing Wen, Jianjian Sun, Wei Wang, Yalong Fan, Junhong Jia, and Wei Chen. 2020. "Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication" Materials 13, no. 3: 635. https://doi.org/10.3390/ma13030635