Microstructure and mechanical properties of as-deposited and annealed TiB2/BN superlattice coatings

Dong, Lei; Li, D.J.; Zhang, S.; Yan, J.Y.; Liu, M.Y.; Gao, C.K.; Wang, N.; Liu, G.Q.; Gu, Hongfang; Wan, Rongxin

doi:10.1016/j.tsf.2012.03.109

Cited by 21 publications

(3 citation statements)

References 23 publications

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“…TiB2 has been wildly used for wear parts, seals, cutting tools, and metal matrix composites due to its high hardness and wear resistance [12]. Multilayering TiB2 with metallics (such as Cr [13], Ti [14], FeMn [15]), carbides and nitrides (such as TiAlN [16], TiN [17], TiC [18,19], VC [20], BN [21]), oxides (such as Al2O3 [22]), and carbon-based layers [23] have been reported to further improve the mechanical properties of the TiB2. In our recent work [24], alternating TiB2-dcMS and Cr-HiPIMS layers are used to fabricate TiB2/Cr multilayer films with varying the Cr interlayer thickness, 2 and 5 nm, and the substrate bias during growth of Cr interlayers from floating, to -60 V and -200 V. The results reveal that increasing the substrate bias during Cr interlayer growth from floating to -60 V produces increases of both film hardness and elastic modulus.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

Chen¹,

Wu²,

Wang³

2022

Preprint

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Alternating TiB2-dcMS and Cr-HiPIMS layers are used to fabricate TiB2/Cr multilayer films. In-troducing a 5-nm-thick Cr interlayer deposited under a substrate bias of -60 V produces slight increases of both film hardness and elastic modulus. The TEM observation indicates that the Cr grains favor epitaxially growth on TiB2 interlayer, forming a coherent TiB2/Cr interface. This produces the hardness increasement. Mechanic measurement by using AFM illustrates that the coherent interface increases the elastic modulus of the Cr up to ~280 GPa, which is significantly higher than bulk material.

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Section: Introductionmentioning

confidence: 99%

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

Chen¹,

Wu²,

Wang³

2022

Preprint

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“…For tribological applications, the combination of TiB 2 with other ceramic layers, both in a crystalline or amorphous structure, has also been reported. The ceramic layer materials include, for example, amorphous (diamond like) carbon, 92,93 boron nitride, 94 silicon nitride, 95 zirconia, 96 or others. 97 The combination of TiB 2 with metal layers has been addressed to accommodate high-stress levels in the ceramic layers with the intention to enhance the ductility and fracture toughness of such composite thin film materials.…”

Section: Introductionmentioning

confidence: 99%

Magnetron sputtered NiAl/TiBx multilayer thin films

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et al. 2022

Journal of Vacuum Science &Amp; Technology A

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Transition metal diboride-based thin films are currently receiving strong interest in fundamental and applied research. Multilayer thin films based on transition metal diborides are, however, not yet explored in detail. This study presents results on the constitution and microstructure of multilayer thin films composed of TiBx and the intermetallic compound NiAl. Single layer NiAl and TiBx and NiAl/TiBx multilayer thin films with a variation of the individual layer thickness and bilayer period were deposited by D.C. and R.F. magnetron sputtering on silicon substrates. The impact of the operation mode of the sputtering targets on the microstructure of the thin films was investigated by detailed compositional and structural characterization. The NiAl single layer thin films showed an operation mode-dependent growth in a polycrystalline B2 CsCl structure with a cubic lattice with and without preferred orientation. The TiBx single layer thin films exhibited an operation mode independent crystalline structure with a hexagonal lattice and a pronounced (001) texture. These TiBx layers were significantly Ti-deficient and showed B-excess, resulting in stoichiometry in the range TiB2.64–TiB2.72. Both thin film materials were deposited in a regime corresponding with zone 1 or zone T in the structure zone model of Thornton. Transmission electron microscopy studies revealed, however, very homogeneous, dense thin-film microstructures, as well as the existence of dislocation lines in both materials. In the multilayer stacks with various microscale and nanoscale designs, the TiBx layers grew in a similar microstructure with (001) texture, while the NiAl layers were polycrystalline without preferred orientation in microscale design and tended to grow polycrystalline with (211) preferred orientation in nanoscale designs. The dislocation densities at the NiAl/TiBx phase boundaries changed with the multilayer design, suggesting more smooth interfaces for multilayers with microscale design and more disturbed, strained interfaces in multilayers with nanoscale design. In conclusion, the volume fraction of the two-layer materials, their grain size and crystalline structure, and the nature of the interfaces have an impact on the dislocation density and ability to form dislocations in these NiAl/TiBx-based multilayer structures.

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“…In 2008, Jens Eichler et al [8] composited BN and ZrO 2 to prepare side dams for use in thin strip casting, which showed satisfactory corrosion resistance, wear resistance, and hightemperature compressive stress. In 2012, by magnetron sputtering, Dong et al [9] prepared a TiB 2 /BN multilayer film with a smaller grain size and a stable layer structure that had a polycrystalline TiB 2 texture with amorphous BN; it showed higher hardness and higher elastic modulus than coatings of only TiB 2 or BN. The study in [10] indicates that McKinnon et al used flash spark plasma sintering (FSPS) technology to quickly sinter a cold-pressed TiB 2 -hBN disc from a powder into an almost-dense material (up to 97%) in less than 110 s. Recently, Bin Song et al [11] prepared nearly densified samples by doping BN and SiC into TiB 2 powder under hot-press sintering conditions at 2000 • C and 50 MPa.…”

Section: Introductionmentioning

confidence: 99%

Effects of theTiB2-SiC Volume Ratio and Spark Plasma Sintering Temperature on the Properties and Microstructure of TiB2-BN-SiC Composite Ceramics

et al. 2021

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TiB2-BN composite ceramics combine excellent electrical conductivity, thermal shock resistance, high-temperature resistance, corrosion resistance, and easy processing of TiB2 and BN. However, in practical applications, their high-temperature oxidation resistance is poor and the resistivity distribution is uneven and changes substantially with temperature. A TiB2-BN-SiC composite ceramic with stable and controllable resistivity was prepared by introducing SiC into the TiB2-BN composite ceramics. In this work, spark plasma sintering (SPS) technology was used to prepare TiB2-BN-SiC composite ceramics with various TiB2-SiC ratios and sintering temperatures. The samples were tested by XRD, SEM, and thermal and mechanical analysis. The results show that as the volume ratio of TiB2-SiC was increased from 3:1 to 12:1, the resistivity of the sample decreased from 8053.3 to 4923.3 μΩ·cm, the thermal conductivity increased from 24.89 to 34.15 W/(m k), and the thermal expansion rate increased from 7.49 (10−6/K) to 10.81 (10−6/K). As the sintering temperature was increased from 1650 to 1950 °C, the density of the sample increased, the mechanical properties were slightly improved, and the resistivity, thermal expansion rate, and thermal conductivity changed substantially. The volume ratio and sintering temperature are the key factors that control the resistivity and thermal characteristics of TiB2-SiC-BN composite ceramics, and the in situ from liquid phases of FeB and FeO also promotes the sintering of the TiB2-BN-SiC ceramics.

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Microstructure and mechanical properties of as-deposited and annealed TiB2/BN superlattice coatings

Cited by 21 publications

References 23 publications

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

A Comparative Investigation on Mechanical Properties of Tib<sub>2</sub>/Cr Multilayer Film by Indentation

Magnetron sputtered NiAl/TiBx multilayer thin films

Effects of theTiB2-SiC Volume Ratio and Spark Plasma Sintering Temperature on the Properties and Microstructure of TiB2-BN-SiC Composite Ceramics

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