Tribology of naturally occurring boric acid films on boron carbide

Erdemir, Ali; Bindal, C.; Zuiker, C.; Savrun, Ender

doi:10.1016/s0257-8972(96)02984-2

Cited by 121 publications

(65 citation statements)

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“…Comparison with values for free boric acid (principle bands at 500 cm -1 , 880 cm -1 and 1085 cm -1 ) suggest three of these OH-BNNS bands to be associated with the B-OH functional group. [43][44][45] Shifts of 40 cm -1 , 15 cm -1 , and 22 cm -1 are observed for the OH-BNNSs relative to the spectrum of free boric acid spectra. 44,45 This is explained by effect of the bulk h-BN substrate on the vibration of the B-OH groups relative to the vibrational freedom of unbound molecules.…”

Section: Resultsmentioning

confidence: 99%

“…[43][44][45] Shifts of 40 cm -1 , 15 cm -1 , and 22 cm -1 are observed for the OH-BNNSs relative to the spectrum of free boric acid spectra. 44,45 This is explained by effect of the bulk h-BN substrate on the vibration of the B-OH groups relative to the vibrational freedom of unbound molecules. 33 The mode at 789 cm -1 in the spectrum of the OH-BNNSs is consistent with the Raman signature of an aryl-boronic acid and is not reported in Raman spectrum of free boric acid molecules.…”

Section: Resultsmentioning

confidence: 99%

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Oxygen Radical Functionalization of Boron Nitride Nanosheets

et al. 2012

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Abstract:The covalent chemical functionalization of exfoliated hexagonal boron-nitride nanosheets (BNNSs) is achieved by the solution phase oxygen radical functionalization of boron atoms in the h-BN lattice. This involves a two-step procedure to initially covalently graft alkoxy groups to boron atoms and the subsequent hydrolytic defunctionalisation of the groups to yield hydroxyl-functionalized BNNSs (OHBNNSs). Characterization of the functionalized-BNNSs using HR-TEM, Raman, UV-Vis, FTIR, NMR, and TGA was performed to investigate both the structure of the BNNSs and the covalent functionalization methodology. OH-BNNSs were used to prepare polymer nanocomposites and their mechanical properties analyzed. The influence of the functional groups grafted to the surface of the BNNSs is investigated by demonstrating the impact on mechanical properties of both non-covalent and covalent bonding at the interface between the nanofiller and polymer matrices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Oxygen Radical Functionalization of Boron Nitride Nanosheets

et al. 2012

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“…The low COF and specific wear rate recorded in the present study may be caused by the formation of a tribo-oxide layer with lubricant property. The heat generated due to friction between the sliding surfaces is sufficient for the oxidation of B 4 C (flat material) according to the reaction below to form B 2 O 3 [28,29,31]. The oxygen required for the reaction can be supplied by the surrounding air.…”

Section: Discussionmentioning

confidence: 99%

“…The coefficient of friction of boron carbide has been reported as low as 0.03, but some reports recorded values up to 0.9 [25][26][27], depending on the load, surface chemical composition, counter body material and humidity. During tribological tests, B 4 C undergoes oxidation, which results in the formation of B 2 O 3 , which further converts to a boric acid (H 3 BO 3 ) film in the presence of sufficient humidity [25,[28][29][30][31]. Boric acid based films reduce the friction by forming a smooth friction surface at the interface, acting as lubricants due to their layered structure [28].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Thermo-Physical, Mechanical and Wear Properties of in-Situ Formed Boron Carbide - Zirconium Diboride Composite

Murthy¹

2017

Ceramics - Silikaty

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“…The presence of humidity in the machining environment is not always deleterious. Low friction coefficient in contact area and enhanced wear performance of such tools is obtained through formation of oxide products of friction-chemical reactions with humidity, resulting by lubricious, layered oxide products of Magnèli phases-type [8,11,12]. This beneficial effect of oxygen-rich environment is observed also in materials containing titanium (Ti3SiC2, TiN) or boron or both of this elements (TiB2, Ti(B)N) to make them "self-adaptive" to frictionwear conditions [13].…”

Section: Introductionmentioning

confidence: 99%

Low friction Ti-B coatings deposited by dual beam IBAD method for wear resistant applications

Twardowska

2015

Mechanik

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Thin Ti-B coatings of 500 nm in thickness were deposited by dual beam ion beam assisted deposition method (DB IBAD) on the surfaces of sintered α-Al2O3 (with 1% vol. MgO) cutting inserts. Deposition of Ti-B coating was conducted in vacuum. Two beams of Ar+ ions were applied of the same energy of ~10 keV. First ion beam was directed to TiB2 target at angle 67 and used for sputtering, the second one was directed perpendicularly to the surface of alumina substrate. XPS was applied to investigate chemical bonds in Ti-B coatings. Detailed spectra of B1s and Ti 2p indicated the presence of TiB2, TiO2 and B2O3. Mechanical properties of coated and uncoated alumina composites were examined by nanoindentation test using diamond indenter of Berkovich-type geometry, loaded in range 0.5 mN to 50 mN. The friction-wear performance of coated alumina were examined in ball-on-disc test using an alumina and a 100Cr6 steel balls as counterparts, loaded at 1 N. Cutting test was carried out in longitudinal turning of 100Cr6 steel shaft without use of any liquid coolant. Coated alumina inserts were harder and more resistant to wear than uncoated ones. The highest hardness of 45 GPa, was calculated by Oliver & Pharr method for coated sample tested under the load of 1 mN. It was almost 3 times the value calculated for uncoated substrate (16.5 GPa). The wear mechanism of Ti-B coated alumina was of abrasive type with alumina ball and of mixed abrasive and adhesive type in the case of friction contact with the steel ball. SEM observation of the surface of Ti-B coated alumina tools after turning revealed the presence of a liquid phase at the worn edge. Keywords: Ti-B coating, dual beam IBAD method, wear resistance, superalloy Streszczenie: Powłoki typu Ti-B o grubości 500 nm zostały nałożone metodą dwuwiązkową IBAD ( ion beam assisted deposition) na powierzchnie płytek skrawających wytworzonych na drodze spiekania proszków α-Al2O3 (z dodatkiem 1% obj. MgO). Powłoki Ti-B nakładano w próżni (10 -4 Pa), stosując dwie wiązki jonów Ar+ o tej samej energii ~10 keV. Pierwszą wiązkę jonów (rozpylającą) skierowano na powierzchnię tarczy TiB2 pod kątem 67°, drugą Właściwości mechaniczne podłoży z powłoką Ti-B oraz bez powłoki określono metodą nanoindentacji przy użyciu wgłębnika o geometrii Berkovicha, w zakresie obciążeń od 0,5 mN do 50 mN. Właściwości tribologiczno-zużyciowe określono w teście zużycia w geometrii kula-tarcza (ball-on-disc test) przy użyciu kulki korundowej oraz stalowej 100Cr6 (jako przeciwpróbki) przy obciążeniu 1 N. Testy skrawności przeprowadzono podczas toczenia wzdłużnego wałka ze stali 100Cr6 bez stosowania cieczy chłodząco-smarujących. Twardość i odporność na zużycie ścierne płytek z powłoką Ti-B były wyższe w porównaniu do płytek referencyjnych (bez powłoki). Najwyższą twardość 45 GPa, obliczono metodą Olivier & Phaar'a dla płytek z powłoką Ti-B przy obciążeniu wgłębnika 1 mN, co stanowiło niemal trzykrotnie wyższą wartość w stosunku do twardości zmierzonej dla podłoży bez powłoki (16,5 GPa). Zużycie płytek z pow...

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Tribology of naturally occurring boric acid films on boron carbide

Cited by 121 publications

References 9 publications

Oxygen Radical Functionalization of Boron Nitride Nanosheets

Oxygen Radical Functionalization of Boron Nitride Nanosheets

Microstructure, Thermo-Physical, Mechanical and Wear Properties of in-Situ Formed Boron Carbide - Zirconium Diboride Composite

Low friction Ti-B coatings deposited by dual beam IBAD method for wear resistant applications

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