Evaluation of magnetron-sputtered TiB2 intended for tribological applications

Berger, M.; Larsson, Mats; Hogmark, Sture

doi:10.1016/s0257-8972(99)00638-6

Cited by 97 publications

(56 citation statements)

References 22 publications

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“…From the literature, most of the TiB 2 coatings reported display the patterns of the hexagonal phase with a preferred (001) orientation 8,9) and the (001) oriented coatings yield the highest hardness.…”

Section: Resultsmentioning

confidence: 99%

Effect of Substrate Temperature, Biasing and Sputter Cleaning on the Structure and Properties of Nanostructured TiB<SUB>2</SUB> Coatings on High Speed Steel

et al. 2010

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Fabrication and development of TiB 2 -based nanostructured coatings was investigated in the present work. By varying the sputter-target power density, substrate temperature, deposition time, substrate-to-target distance, substrate biasing and substrate sputter cleaning, the relationship between the sputtered structure, properties and sputtering conditions were established. The experimental results showed that the target-to-substrate distance played a major role in the coating structure and properties. Sputter cleaning of substrate helped to improve TiB 2 coating hardness and adhesion. The deposition process could be controlled to produce a TiB 2 coating with both high hardness and good adhesion strength. This was achieved by introducing substrate sputter-cleaning and then biasing for the early stage of deposition, followed by deposition without biasing.

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Section: Resultsmentioning

confidence: 99%

Effect of Substrate Temperature, Biasing and Sputter Cleaning on the Structure and Properties of Nanostructured TiB<SUB>2</SUB> Coatings on High Speed Steel

et al. 2010

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“…During machining the built-up material detaches periodically with a piece of the tool or the coating thus accelerates a damage process of the tool and causes a decrease in surface roughness of the workpiece. The lowered friction coefficient of boron-and titanium-rich materials comes from oxidation reactions which are activated thermally (by friction) during machining in humidity environment [7,10]. In the case of boron present on the friction contact, H3BO3 is the main product of the oxidation reaction, conducted in low temperatures (<100C).…”

Section: Methodsmentioning

confidence: 99%

“…In the case of alumina composites, the addition of titanium diboride is limited up to 10% vol. At higher TiB2 contents, a decreased toughness of these composites is observed [7]. Composites containing less than 10% of titanium diboride are characterized by increased hardness but the content of this phase is insufficient to decrease the friction coefficient of the composite effectively.…”

Section: Introductionmentioning

confidence: 99%

“…The friction-wear conditions for operating of the tool must be taken into account, as the friction coefficient of all known solid lubricants can vary even over a wide range depending on material used as a counterpart, an applied load, a temperature and an environment. Diamond-like carbon DLC and MoS2 are of highest potential to be used in tribological applications as solid lubricants, because of their extremely low coefficient of friction, but obtained only in some conditions [7]. Ultra low friction coefficients of 0.01 for DLC and 0.02 for MoS2 indicate this coatings as ideal for dry machining, but only at high vacuum, inert or dry nitrogen environments [8].…”

Section: Introductionmentioning

confidence: 99%

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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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“…Both ceramics are extremely hard, with high melting temperatures, and extensive usage as tribological coatings. Recent studies show that both are optimal coatings for use opposite aluminum [15,16]. For example, TiC coatings on graphite baffles withstand reaction with molten aluminum longer than most refractory materials [17].…”

Section: Examplesmentioning

confidence: 99%

Reaction enthalpies as selection criteria for tribological coatings

Ooi

Adams

Singisetti

2003

Physica Status Solidi (b)

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A wide range of coatings are used for a variety of applications. Selection criteria for these coatings include coating-substrate adhesion, hardness, melting temperature, coefficient of thermal expansion mismatch, corrosion resistance, and cost. A factor often ignored is the possibility of reaction between the coating and the other surface which it contacts during use. This is especially important when frictional forces produce enough heat to locally melt asperities or even cause friction welding, as that heat will enhance the likelihood of chemical reactions at the interface. One aspect of this is to consider the reaction enthalpies between coatings and the surfaces they contact during operation. We explore the use of reaction enthalpies between coatings and opposing surfaces as a criteria for selecting coatings. Simple thermodynamic calculations are presented for several couples of coating -opposing surfaces. Conclusions are drawn about the relevance based on experimental evidence.

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Evaluation of magnetron-sputtered TiB2 intended for tribological applications

Cited by 97 publications

References 22 publications

Effect of Substrate Temperature, Biasing and Sputter Cleaning on the Structure and Properties of Nanostructured TiB<SUB>2</SUB> Coatings on High Speed Steel

Effect of Substrate Temperature, Biasing and Sputter Cleaning on the Structure and Properties of Nanostructured TiB<SUB>2</SUB> Coatings on High Speed Steel

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

Reaction enthalpies as selection criteria for tribological coatings

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