Effect of heat treatment temperature on the structure and tribological properties of nanometer lanthanum borate

Wang, Yue; Huang, Daikuan

doi:10.18280/ijht.350107

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…Moreover, there were two broad humps centered at 28.5°and 45.6°with diffuse peaks, indicating that LBN-1 and LBN-2 are amorphous. 26,38 The sharp peak in the XRD pattern of LBN-2 at 31.4°was steeper than LBN-1, which possibly attributed to the longer treatment duration of the hydrothermal process. Figure 5(b) shows the variation of absorbance at 382 nm over time.…”

Section: Resultsmentioning

confidence: 95%

“…[17][18][19][20] As confirmed by many papers, [21][22][23][24][25] lanthanum borate nanoparticles are one of the highly efficient green lubricant additives owing to their active elements such as La and B, which possess excellent anti-wear properties under high load. Wang and Huang 26 found that the tribological performance of 150 N base oil was improved by lanthanum borate nanoparticles, but the larger size lanthanum borate nanoparticles resulted in exacerbate abrasive wear and reducing tribological performances. Unfortunately, the mechanisms of protective film formation lubricated with different sizes of lanthanum borate nanoparticles have not been further discussed in these research studies.…”

Section: Introductionmentioning

confidence: 99%

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Influence of sizes on tribological properties and tribofilm formation of lanthanum borate nanospheres in soybean oil

Wang

Chen

Fang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Vegetable oils exhibit excellent lubrication properties owing to their polar functional groups, which are liable to adsorb on the metal surfaces to form adsorption film and tribofilm. Additionally, nanoparticles play significant roles in enhancing the tribological performances of base oils by means of forming a tribofilm between friction parts. However, little work has been done on clarifying the interaction of nanoparticles and vegetable oils in the film-forming process. In this paper, two varieties of lanthanum borate nanospheres with average diameters of 50 nm (named LBN-1) and 105 nm (named LBN-2) were synthesized. The morphologies, size distribution, and chemical compositions of the nanospheres were characterized using a scanning electron microscopy, dynamic light scattering, Fourier transform infrared, and X-ray diffraction. The tribological characteristics of soybean oils with lanthanum borate nanospheres were evaluated by a four-ball tribo-tester. The tribological performances of soybean oils were obviously improved by lanthanum borate nanospheres. The focused-ion beam/transmission electron microscope analyses results revealed a uniform tribofilm containing LBN-1 was formed, contributing to excellent friction-reducing and anti-wear performances. Whereas the tribofilm of soybean oil/LBN-2 was uneven in thickness and contained more wear debris. The outcome of this work provides significant insights into the tribofilm formation for metal surfaces lubricated with vegetable oils containing different sizes of lanthanum borate nanoparticles.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Influence of sizes on tribological properties and tribofilm formation of lanthanum borate nanospheres in soybean oil

Wang

Chen

Fang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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show abstract

“…After the temperature increased to 400~800 ℃, the sample basically lost its strength. Fortunately, under the high temperature of 200 ~ 400 ℃, the compressive strength of XS-reinforced AASCM sample plunged under the high temperature of 200~400 ℃ [32]. The XS managed to enhance the compressive and flexural strengths of the sample.…”

Section: Mechanical Properties Of Aascm Reinforced By Different Fibermentioning

confidence: 99%

Mechanical Properties of Plant Fibers Reinforced Alkali-activated Slag Cementitious Material at High Temperature

Zhu¹,

Zheng²,

Sneed³

et al. 2019

ACSM

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With the depletion of natural resources and the growing awareness of environmental protection, it is increasingly important to apply more renewable resources in construction material. Considering the low-cost and abundance of plant fibers, this paper proposes a novel cementitious material called plant fibers reinforced alkali-activated slag cementitious material (PF-AASCM). Specifically, the author investigated the types and features of fibers and how they affect the AASCM properties. On this basis, the influencing factors of the mechanical properties and microstructure of PF-AASCM were determined, and the measures to enhance the compressive and flexural strengths of the PF-AASCM were evaluated one by one. Next, the potential of applying plant fibers as internal enhancements of the AASCM was thoroughly explored. The results show that the PF-AASCM is economically and technically viable for many construction applications. The plant fiber reinforcement can enhance the ultimate strength of the AASCM rapidly (70 % growth in 7d and 120 MPa/17,000psi in 28d), resulting in excellent acid resistance and freeze-thaw durability. In addition, the optimal mix ratio is 1:4 wt.% between sodium hydroxide and potassium silicate. Under this ratio, the mechanical properties and microstructural features of the sample will be comparable to those of Portland cement. The compressive strength of single-row-hole sample of wheat straw reinforced AASCM was 10.75MPa at room temperature, equivalent to that of standard concrete sample MU7.5. The compressive strength of such a PF-AASCM decreased linearly with the growth in temperature. After the temperature reached 600 ℃, the plant fiber still exerted a certain tensile force on the matrix. By contrast, the polypropylene fiber started to melt down after the temperature increased to 200 ~ 400 ℃, causing brittle failure of the matrix. Under the high temperature of 200 ~ 400 ℃, the fine steel fiber enhanced the compressive properties of samples, which showed clear plastic deformation. The research results shed new light on reducing pollution and enhancing AASCM ductility.

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“…Ageing is mainly due to polymer chain degradation, characterized by the oxidation of the macromolecules accompanied by morphological changes [13][14][15]. As such, FTIR spectroscopy can be regarded as a powerful technique to identify the different oxidation products developing during ageing and allowing also to quantify their concentration changes upon time.…”

Section: Introductionmentioning

confidence: 99%

Sun radiation and temperature impact at different periods of the year on the photooxidation of polyethylene films

Abdelhafidi¹,

Chabira²,

Yagoubi³

et al. 2017

IJHT

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Analysis of the IR spectra of weathered films exposed at different periods of the year reveals that, the main regions of the IR spectrum affected by solar irradiation and temperature variation are the complex carbonyls and unsaturations composite absorption bands. Their respective kinetics vary in different manner according to the period at which the exposure is started. Curve fitting has been performed to refine the analysis of the IR spectra and to identify all the chemical species constituting the complex absorption bands. The analysis of the results let appears that whatever the exposure period of the year is, it does not affect the type of developing products, but it has strong effect on their kinetic rate of formation. The warm season is the more effective in terms of carbonyl formation and crystallinity index. This indicates that the Norrish type I (NI) process is very important in this season and it adds to the Norrish type II (NII) process. Both contribute to the carbonyl and vinyl groups formation via chain scission reactions; however the NII process is active during all the period of the year.

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Effect of heat treatment temperature on the structure and tribological properties of nanometer lanthanum borate

Cited by 4 publications

References 14 publications

Influence of sizes on tribological properties and tribofilm formation of lanthanum borate nanospheres in soybean oil

Influence of sizes on tribological properties and tribofilm formation of lanthanum borate nanospheres in soybean oil

Mechanical Properties of Plant Fibers Reinforced Alkali-activated Slag Cementitious Material at High Temperature

Sun radiation and temperature impact at different periods of the year on the photooxidation of polyethylene films

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