Alkylamine-functionalized hexagonal boron nitride nanoplatelets as a novel material for the reduction of friction and wear

2016 ◽  
Vol 18 (33) ◽  
pp. 22879-22888 ◽  
Author(s):  
Sangita Kumari ◽  
Om P Sharma ◽  
Om P Khatri
Keyword(s):  
Boron Nitride ◽  
Friction And Wear ◽  
Hexagonal Boron Nitride ◽  
Dispersion Stability ◽  
Novel Material

Alkylamine-functionalized hexagonal boron nitride nanoplatelets exhibiting long-term dispersion stability were demonstrated as novel additives for the reduction of friction and wear.

Tribological and Corrosion Behavior of HVOF Sprayed Cr3C2-NiCr with Nickel Cladded Graphite and Hexagonal Boron Nitride

2021 ◽  
Author(s):  
M. Oechsner ◽  
T. Engler ◽  
H. Scheerer ◽  
Y. Joung ◽  
K. Bobzin ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Friction And Wear ◽  
Room Temperature ◽  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
Solid Lubricants ◽  
Wear Behaviour ◽  
Wear Volume ◽  
Coating Microstructure ◽  
Sprayed Coatings

Abstract High-velocity oxyfuel (HVOF) sprayed coatings of Cr3C2-NiCr containing solid lubricants such as nickel cladded graphite and hexagonal boron nitride were successfully developed and characterised with the aim of optimizing their friction and wear behaviour. HVOF technology was used for the integration of solid lubricants to achieve strong cohesion between particles while minimizing thermal decomposition. Coating microstructure and composition were measured and correlated to the results of tribological and corrosion tests. The integration of the solid lubricant greatly reduced friction and wear volume at room temperature, but the lubricating effect was highly dependent on atmosphere and temperature. Cr3C2-NiCr with hBN, however, tends to exhibit more stable wear resistance over a wider temperature range and can be used at temperatures beyond 450 °C.

scholarly journals Non-cytotoxic hydroxyl-functionalized exfoliated boron nitride nanoflakes impair the immunological function of insect haemocytes in vivo

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Elżbieta Czarniewska ◽  
Lucyna Mrówczyńska ◽  
Magdalena Jędrzejczak-Silicka ◽  
Patryk Nowicki ◽  
Martyna Trukawka ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Water Solubility ◽  
Hexagonal Boron Nitride ◽  
Hydroxyl Groups ◽  
Latex Beads ◽  
Insect Haemocytes ◽  
Low Cytotoxicity

Abstract To induce the water solubility of hexagonal boron nitride (h-BN), we exfoliated and functionalized bulk h-BN with hydroxyl groups (h-BN-OH-n). Short-term studies showed that h-BN-OH-n induced low cytotoxicity in different models: insect haemocytes (in vivo), human erythrocytes and mouse fibroblasts (in vitro). We also demonstrated that Alexa Fluor 647-h-BN-OH-n administered topically to the insects passed through the cuticle barrier and was phagocytosed by haemocytes. Nanoflakes did not affect the haemocyte cell membrane and did not interfere with the phagocytosis of latex beads. Long-term immunoassays showed that h-BN-OH-n, despite not inducing haemocytotoxicity, impaired nodulation, the most important cellular immune response in insects. The haemocytes exposed to h-BN-OH-n and then to bacteria differed in morphology and adhesiveness from the haemocytes exposed only to bacteria and exhibited the same morphology and adhesiveness as the control haemocytes. The h-BN-OH-n-induced decrease in nodulation can therefore result from the reduced ability of haemocytes to recognize bacteria, migrate to them or form microaggregates around them, which can lead to dysfunction of the immune system during pathogen infection. Long-term in vivo studies with animal models are still necessary to unambiguously confirm that h-BN is biocompatible and useful for application as a platform for drug delivery or for bioimaging.

scholarly journals 3D graphene/hexagonal boron nitride composite nanomaterials synergistically reduce the friction and wear of Steel‐DLC contacts

Nano Select ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 791-801
Author(s):  
Shunshun Qi ◽  
Xubing Wei ◽  
Lin Chen ◽  
Zhongrong Geng ◽  
Jinqiong Luo ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Friction And Wear ◽  
Hexagonal Boron Nitride ◽  
Composite Nanomaterials ◽  
3D Graphene

Sliding wear and friction of Si3N4-SiC-based ceramic composites containing hexagonal boron nitride

1998 ◽  
Vol 212 (5) ◽  
pp. 381-387 ◽  
Author(s):  
R Westergård ◽  
A Åhlin ◽  
N Axén ◽  
S Hogmark
Keyword(s):  
Boron Nitride ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Hexagonal Boron Nitride ◽  
Ceramic Composites ◽  
Wear Behaviour ◽  
Friction Coefficients ◽  
X Ray ◽  
Wear Rates ◽  
Low Level

The friction and wear behaviour of a series of new Si3N4-SiC-based ceramic composites, intended for face seal applications, has been investigated with cylinder-on-disc equipment. In particular, the influence of water and vapour on the friction, wear and tribo-film formation has been studied. The ceramics consisted of Sis3N4 and SiC in the proportions 7:3, to which 0, 4 or 8 wt% of hexagonal boron nitride was added as a solid lubricant. All specimens were produced by hot isostatic pressing. X-ray diffraction and scanning electron microscopy were used to reveal the phase composition and microstructure respectively. The hardness was assessed using Vickers indentation. The chemical composition of the tribo-films was studied with X-ray photoelectron spectroscopy. The major results are that both friction and wear showed distinct low and high levels. The high friction level corresponded to friction coefficients between 0.4 and 0.9 and wear rates between 104 and 105 μm3/Nm. The low level corresponded to friction coefficients between 0.02 and 0.1, and wear rates between 10 and 103 μm3/Nm. When water or saturated vapour was present in the tribo-system, both friction and wear were low. All surfaces produced in the low level were smooth, covered by a thin well-adhering tribo-film while the high level resulted in strongly oxidized and patchy tribo-film covered by wear particles.

scholarly journals Examining the role of hexagonal boron nitride nanoparticles as an additive in the lubricating oil and studying its application

2020 ◽  
Vol 234 (1-2) ◽  
pp. 19-36
Author(s):  
Sangharatna Ramteke ◽  
H Chelladurai
Keyword(s):  
Boron Nitride ◽  
Friction And Wear ◽  
Hexagonal Boron Nitride ◽  
Mechanical Systems ◽  
Friction Reduction ◽  
Lubricating Oil ◽  
Tribological Characteristics ◽  
Gravimetric Analysis ◽  
Reduction Behavior

Lubricating oil plays an important role in minimizing the friction and wear of many mechanical systems. The additives present in the conventional lubricant are inadequate to reduce the friction and wear of today’s mechanical systems. However, the use of these additives has a significant effect on the environment due to their fast chemical degradation. In recent years, nanoparticle-based lubricant has attracted great attention due to their friction reduction behavior. Therefore, it is of great importance to examine the role of nanoparticle addition in the conventional lubricant and its influence on the tribological characteristics of the mechanical systems. Hence, this research work focused on the formulation of hexagonal boron nitride nanoparticle-based nanofluids and its effect on the tribological characteristics of cylinder liner and piston rings of a realistic diesel engine. The different concentrations of hBN nanoparticle-based nanofluids were formulated and characterized using the ultraviolet–visible spectroscopy and the thermal gravimetric analysis. The results of the experimental analysis showed that hBN nanoparticles as an additive in the lubricating oil exhibited better anti-wear and friction reduction behavior than the conventional base oil 20W40.

Alkyl-Chain-Grafted Hexagonal Boron Nitride Nanoplatelets as Oil-Dispersible Additives for Friction and Wear Reduction

2015 ◽  
Vol 7 (6) ◽  
pp. 3708-3716 ◽  
Author(s):  
Sangita Kumari ◽  
Om P. Sharma ◽  
Rashi Gusain ◽  
Harshal P. Mungse ◽  
Aruna Kukrety ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Friction And Wear ◽  
Alkyl Chain ◽  
Hexagonal Boron Nitride ◽  
Wear Reduction
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