Self-lubricating mechanisms via the in situ formed tribo-film of sintered ceramics with hBN addition in a high humidity environment

Chen, Wei; Zhang, Da; Lv, Zhenglin; Hua-qiang, LI

doi:10.1016/j.ijrmhm.2017.03.014

Cited by 27 publications

(12 citation statements)

References 23 publications

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“…The negative values of Gibbs free energy in chemical reactions mentioned above, revealed possible reaction of Si3N4 and BN with moisture in the air or water in generating SiO2, B2O3, and H3BO3 [30][31][32]. According to our previous study [20], spalling pits were first to have appeared formed on SN10 pins, since hBN spalled first, and the worn debris were then embedded in the pits to react with water during the grinding friction process. Thus, a triboflim made up of Fe2O3, SiO2, and B2O3 began to take shape on the worn surfaces, endowing the sliding pair with hydrodynamic lubrication.…”

Section: Xps Analysis On the Worn Surfacesmentioning

confidence: 78%

“…However, in drip-feed water lubricating condition, the friction coefficient of Si 3 N 4 -20 vol% hBN decreased from 0.35 to 0.01 [18]. Furthermore, with the increase of hBN to 10 vol% at a relative humidity RH of 55~65%, the friction coefficient and wear rate were further reduced respectively to 0.03 and 10 −6 mm 3 /Nm [19,20]. Evidently, the addition of hBN to the ceramic materials has improved their the tribological properties.…”

Section: Introductionmentioning

confidence: 93%

“…In the case a B 4 C ceramic matrix after adding hBN, the friction coefficient lowered from 0.373 for the B 4 C/B 4 C tribopair to 0.005 for the B 4 C-20 wt% hBN/B 4 C tribopair in water lubricating condition [15]. In our previous research [16][17][18][19][20], we studied the tribological performances of Si 3 N 4 -hBN bearing on stainless steel at different sliding speeds and with a normal load. When the speed was 1.73 m/s and a load of 10N in dry friction conditions, the friction coefficient measured was around 0.12 for the Si 3 N 4 -10 vol% hBN/ASS (austenitic stainless steel) tribopair [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication

et al. 2020

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This paper concerns a comparative study on the tribological properties of Si3N4-10 vol% hBN bearing on GCr15 steel under seawater lubrication and dry friction and fresh-water lubrication by using a pin-on-disc tribometer. The results showed that the lower friction coefficient (around 0.03) and wear rate (10−6 mm/Nm) of SN10/GCr15 tribopair were obtained under seawater condition. This might be caused by the comprehensive effects of hydrodynamics and boundary lubrication of surface films formed after the tribo-chemical reaction. Despite SN10/GCr15 tribopair having 0.07 friction coefficient in the pure-water environment, the wear mechanismsits were dominated by the adhesive wear and abrasive wear under the dry friction conditions, and delamination, plowing, and plastic deformation occured on the worn surface. The X-ray photoelectron spectroscopy analysis indicated that the products formed after tribo-chemaical reaction were Fe2O3, SiO2, and B2O3 and small amounts of salts from the seawater, and it was these deposits on the worn surface under seawater lubrication conditions that, served to lubricate and protect the wear surface.

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Section: Xps Analysis On the Worn Surfacesmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication

et al. 2020

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“…CaF2 and BaF2 have favorable lubricating properties at high temperatures, but they are generally used under dry-friction conditions [8]. Conversely, hBN has favorable lubricating properties under dry and wet conditions [9]. It has a planar hexagonal net layer crystal structure similar to the hexagonal crystal system structure of graphite.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Friction and Wear Properties of NiCr/hBN Self-Lubricating Composites

Zhu

Wei

Huang

et al. 2019

Metals

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NiCr/hBN self-lubricating composites with hBN solid-lubricant contents of 8%, 9%, 10%, 11%, and 12% (mass fractions) were prepared by powder-metallurgy method. Their tribological properties at room temperature and 600, 700, and 800 °C were studied. SEM and XRD were performed to analyze their wear-surface morphology and abrasive-dust composition. Results indicate that the NiCr/hBN self-lubricating composites have favorable tribological properties at room temperature and 600 °C. The optimum comprehensive friction and wear performance are achieved at 10% hBN, and the main wear mechanism is abrasive wear. At 700 and 800 °C, the friction and wear properties of NiCr/hBN self-lubricating composites obviously decline. The wear surface experiences oxidation and the spinel oxides Cr2O3, NiCr2O4, and CrBO3 are formed. The main wear mechanism becomes combined scratching and glue form of adhesive wear, leading to greatly increased wear rate for the NiCr/hBN sel-lubricating composites.

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“…Our group has been devoted to the tribological research of Si 3 N 4 ceramic composites in various fields, and the developed Si 3 N 4 -hBN ceramic composites have certain practical functions in many fields [9][10][11][12][13][14][15][16][17] . However, in Si 3 N 4 -hBN ceramic composites, the binding capacity of hBN and ceramic matrix is poor, and excessive addition of hBN will cause the ceramic composites to lose their original high strength and high hardness.…”

Section: Introductionmentioning

confidence: 99%

Laminated Si3N4-Mo Composites Produced by Hot Pressing

Chen

Zhao

Wang

et al. 2020

Preprint

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In this paper, the physical, mechanical and friction behavior of Si3N4-Mo laminated composites were investigated. It can be found that the multilayer structure could improve the fracture toughness of laminated composite compared with pure Si3N4. Through the thermodynamic and kinetic calculations of chemical reactions, we conclude that the main product of the interface is Mo5Si3 which caused poor physical and mechanical properties of Si3N4-Mo layered ceramics. The higher content of Mo was beneficial to hinder the diffusion of cracks and improved the fracture toughness of the material, but with the lower content of Mo, Si3N4-Mo laminated ceramic composite had better tribology properity . In addition, with the increase of the load, the tribology properity of Si3N4-Mo laminated ceramic composite decreased, and the friction mechanism of Si3N4-Mo/TC4 is a mixed wear of adhesive wear and abrasive wear.

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Self-lubricating mechanisms via the in situ formed tribo-film of sintered ceramics with hBN addition in a high humidity environment

Cited by 27 publications

References 23 publications

Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication

Tribological Properties of Si3N4-hBN Composite Ceramics Bearing on GCr15 under Seawater Lubrication

High-Temperature Friction and Wear Properties of NiCr/hBN Self-Lubricating Composites

Laminated Si3N4-Mo Composites Produced by Hot Pressing

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