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The aim of this research was to analyze the effect of inorganic additives on the tribological properties of the high-density polyethylene (HDPE) matrix composite surface. Titanium (Ti) and hexagonal boron nitride (hBN) were added in different mass fractions. The samples were produced by pressing a pre-prepared mixture of granules. The composite sam...
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... Due to applications in catalysis [1][2][3][4][5] and opto-electronics [6][7][8], covalent organic frameworks (COFs) have garnered increasing interest in the last decades. The enlarged rigid conjugated ring has triggered huge interest to not only modify and engineer COFs with fully π-conjugated core and linker units but also supply more opportunities to expand the availability of 2D materials beyond systems such as graphene [9][10][11][12][13], boron nitride [14,15], and black phosphorus [13,[16][17][18]. Accompanying the discovery of COF structure with X-ray diffraction, the study of COFs has brought new vigor to the development of COFs [4,19,20]. ...
Boroxine covalent organic frameworks (boroxine COFs) can be referred to as two-dimension (2D) polymer networks with cores of boroxine connected with rigid linker and extended in x or y dimensions, which might be good candidates for organic electronic and luminescence material. However, the engineering COFs with improved charge transfer and conduction properties based on pore size and linker structure still confront various challenges. Here, we investigate the geometrical structure and electronic properties with linkers from phenyl to biphenyl and the replacement of H with F atom in 2D scale with the CRYTSTAL17 software at the density functional theory (DFT) level with the global-hybrid PBE0 functional and POB-TZVP basis set, using a 5 × 5 k-point mesh. The increased pore diameter reduced their energy gap. Replacing the F atom with the H atom lowered their VBMs and conduction band minimums (CBMs). Computation results can assist the experimental scientist in producing highly conductive 2D boroxine COFs.
... However, there is a lack of comparative studies on technical ceramics [14]. Wear testing was conducted on composite materials containing BN [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], although less information is available regarding the tribological properties of pure BN specimens. Several of these studies performed tests to analyse the impact of BN additions on the friction-and wear-resistant properties of different materials [16,17,19,21,[25][26][27][28][29]. ...
... Wear testing was conducted on composite materials containing BN [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], although less information is available regarding the tribological properties of pure BN specimens. Several of these studies performed tests to analyse the impact of BN additions on the friction-and wear-resistant properties of different materials [16,17,19,21,[25][26][27][28][29]. No previous work was conducted on BN-SiO 2 composites, such as BN-grade M26, in the subject of tribology. ...
Ceramics are considered to be candidate materials for galvanising pot bearing materials due to their excellent corrosion resistance in many molten metals. Galvanising pot roll bearings must have excellent wear resistance, and, therefore, it is important to understand the wear behaviour of prospective bearing materials. This study investigates the friction-and wear-resistant properties of select ceramics, namely, pure hBN, BN M26, AlN-BN, Macor, 3YSZ, Al 2 O 3 and Si 3 N 4. The ceramics were tested at different sliding speeds using a pin-on-disc device equipped with SiC pins. The lowest coefficient of friction (COF) achieved was below 0.1, and it was measured for pure hBN at a 3.14 m/min sliding speed. However, a wear scar analysis showed that the BN grades suffered from severe wear. The highest wear rate was obtained for BN M26 at a 9.42 m/min sliding speed and was equal to 17.1 × 10 −6 mm 3 N −1 m −1. It was shown that the wear coefficient of the tested ceramics varied exponentially with hardness. The lowest wear was observed on the 3YSZ, Al 2 O 3 and Si 3 N 4 ceramics, which showed no volume loss, and, for this reason, they can be potentially used as bearing materials in continuous galvanising lines.
The paper presents the results of experimental studies, including tribological tests of silicone-based compositeswith additions of hexagonal boron nitride (hBN) and titanium (Ti). The tests were conducted on a BrukerUMT2 tribotester and using a pin-on-disk setup developed by the authors, without a lubricating medium,and they employed a steel ball made of 100Cr6 steel and a sample made of the composite. During the tests,the products were not removed from the contact area. The paper analyzes the influence of additives on thetribological properties of the composite, i.e., the coefficient of friction (COF) as a function of distance and thewear of the tested samples. In the case of samples containing hBN, the COF decreases with an increase in itscontent. After reaching a volumetric percentage concentration of 20%, it begins to stabilize with the increasein mass loss. The profiles of COF changes as a function of distance for samples with different additivecontents are comparable. The self-lubricating properties of hBN have been confirmed. The addition of Tireduces the COF value, which decreases with the increase in the Ti content. Samples with a mass percentageconcentration exceeding 100% of the Ti content have a COF value equal to the initial value for silicone. Thecomposite containing hBN has a lower COF value than samples with the Ti addition, and the wear tracks ontheir surface are narrower and shallower.
