Adhesion, friction and micromechanical properties of ceramics

Miyoshi, Kazuhisa

doi:10.1016/0257-8972(88)90177-6

Cited by 18 publications

(3 citation statements)

References 23 publications

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“…As the contact pressure increases COF increases in a non-linear fashion with the applied load, subsequently reaching constant values until the film fails which can be noted with a sudden increase in the COF vs. applied load response. The increase of COF with the applied load relates to the plasticity and ploughing effect of diamond probe within the a–C:H film [ 54 ]. As COF increases the stress beneath the contacting probe becomes more significant with the possibility of failure to follow the probe [ 55 ].…”

Section: Resultsmentioning

confidence: 99%

Metal (Ag/Ti)-Containing Hydrogenated Amorphous Carbon Nanocomposite Films with Enhanced Nanoscratch Resistance: Hybrid PECVD/PVD System and Microstructural Characteristics

et al. 2018

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This study aimed to develop hydrogenated amorphous carbon thin films with embedded metallic nanoparticles (a–C:H:Me) of controlled size and concentration. Towards this end, a novel hybrid deposition system is presented that uses a combination of Plasma Enhanced Chemical Vapor Deposition (PECVD) and Physical Vapor Deposition (PVD) technologies. The a–C:H matrix was deposited through the acceleration of carbon ions generated through a radio-frequency (RF) plasma source by cracking methane, whereas metallic nanoparticles were generated and deposited using terminated gas condensation (TGC) technology. The resulting material was a hydrogenated amorphous carbon film with controlled physical properties and evenly dispersed metallic nanoparticles (here Ag or Ti). The physical, chemical, morphological and mechanical characteristics of the films were investigated through X-ray reflectivity (XRR), Raman spectroscopy, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) and nanoscratch testing. The resulting amorphous carbon metal nanocomposite films (a–C:H:Ag and a–C:H:Ti) exhibited enhanced nanoscratch resistance (up to +50%) and low values of friction coefficient (<0.05), properties desirable for protective coatings and/or solid lubricant applications. The ability to form nanocomposite structures with tunable coating performance by potentially controlling the carbon bonding, hydrogen content, and the type/size/percent of metallic nanoparticles opens new avenues for a broad range of applications in which mechanical, physical, biological and/or combinatorial properties are required.

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Section: Resultsmentioning

confidence: 99%

Metal (Ag/Ti)-Containing Hydrogenated Amorphous Carbon Nanocomposite Films with Enhanced Nanoscratch Resistance: Hybrid PECVD/PVD System and Microstructural Characteristics

et al. 2018

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“…Load-dependent friction behavior is frequently observed in tribological studies [34,35] and Miyoshi [34] proposed the empirical relation l=kW x (W is the normal load; k and x are fit parameters) for diamond sliding on a ceramic film under the condition that only plastic deformation was produced without fracture damage. However, in the present case, the enhancement of l can not be interpreted in terms of plastic deformation as proposed by Miyoshi, since the load-displacement curves for c-BN film and diamond (Fig.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and Tribological Properties of Epitaxial Cubic Boron Nitride Thin Films Grown on Diamond

et al. 2008

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Cubic boron nitride (c-BN) is a very promising material with respect to applications as a hard coating for cutting tools due to its many desirable properties including a hardness second only to diamond, oxidation resistance and chemical inertness against iron even at high temperatures with the latter property resulting in the ability to machine ferrous metals. However, these potential applications are hindered by the bad adhesion of c-BN films to most substrate materials. This tendency of c-BN films to delaminate also puts significant obstacles to accurate measurements of their mechanical properties. The poor adhesion of such samples is recognized as being due to the high compressive stress caused by energetic ion bombardment during growth and to a mechanically soft turbostratic boron nitride (t-BN) interlayer between c-BN and substrates. [1] Up to now, most of the c-BN films consist of nano-sized crystallites and have the above addressed layered structure. Thus, the elastic and mechanical properties, which have been studied with different methods, [2][3][4] are certainly not representative for c-BN alone. Recently, by introducing fluorine into the gas phase, thick polycrystalline c-BN films were synthesized by jet-plasma chemical vapor deposition (CVD) and microwave-plasma CVD [5,6] with a submicron lateral grain size and a nanoindentation study on these c-BN films was reported. [6][7][8] However, a 100 nm thick t-BN interlayer and the large number of grain boundaries still exist in these c-BN films. [7,8] Furthermore, in most cases sample polishing is required prior to hardness measurements since these c-BN films are considerably rough. [8] Very recently, we have demonstrated that thick heteroepitaxial c-BN films without any intermediate t-BN layer can be prepared on CVD diamond films and single crystal diamond substrates using ion beam assisted deposition (IBAD). [9,10] These thick, and single crystalline c-BN films possess very smooth surfaces that allowed to accurately determine their mechanical behavior as expressed by Young's modulus [11] and hardness.Scratch tests have been widely used as a convenient method for estimating adhesion of thin hard wear-resistant coatings such as titanium nitride (TiN), diamond-like carbon (DLC) and c-BN to substrates. [12][13][14][15][16][17][18] In the traditional scratch test procedure a diamond tip is drawn across the coating surface under a progressively increasing normal load until the coating becomes detached or fractured. The smallest load at which any recognisible failure occurs is called the "critical load" L c . However, the relationship between this critical load and the adhesive strength of the interface between the substrate and coating is yet unclear. In addition to the coatingsubstrate bond strength itself, a wide range of factors are known to affect the critical load value obtained from the scratch test. [19][20][21][22][23][24][25][26][27] The aim of this work was to show the relative improvement of the mechanical and tribological properties of the c-BN film...

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“…Second, associated with such situations, Miyoshi proposed that would depend on the normal load L in the form ‫ס‬ aL y . 24 By fitting the experimental data, the values of a and y are determined to be 0.07 and 0.4, which are insensitive to the N content of the films. Third, the results obtained by the constant load scheme, as indicated by solid dots in the figure, obey the same trend.…”

Section: F Friction Coefficient and Critical Loadmentioning

confidence: 99%

Mechanical, tribological, and stress analyses of ion-beam-deposited boron-rich boron nitride films with increasing N content

et al. 1999

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Boron (B) films and B-rich BN x films with different N contents (4.1-40.3 at.%.) were deposited by dual ion-beam deposition. The films consist of a B-rich phase constructed of icosahedral atomic clusters and a graphitelike boron nitride phase. The films with N content ഛ20.3 at.% is dominated by the B-rich phase. Their hardness rises with increasing N content to reach a maximum value of 18.8 GPa. The hardness-to-elastic modulus ratio (H/E) and the critical load of the films also increase, showing stronger wear resistance of the films. These results can be explained if some N-B-N chains are formed at the interstitial sites in the network of the B-rich phase, which cross-link different icosahedral atomic clusters in the B-rich phase and strengthen the rigidity of the structure. For the films with higher N contents, the volume fraction of the graphitelike boron nitride phase becomes higher, and the hardness drops as a consequence. However, the change in the H/E ratio is rather mild. This implies that the wear resistance of the films is not altered and explains why the critical load of the films remains almost unchanged. In addition, the friction coefficient of all the films depends on the normal load L in the form of ‫ס‬ aL y , where a and y are numerical parameters and are insensitive to the change in the N content. Furthermore, compressive stress was found to increase from about 0.12 to 1.7 GPa when the N content increased from 4.1 to 40.3 at.%.

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Adhesion, friction and micromechanical properties of ceramics

Cited by 18 publications

References 23 publications

Metal (Ag/Ti)-Containing Hydrogenated Amorphous Carbon Nanocomposite Films with Enhanced Nanoscratch Resistance: Hybrid PECVD/PVD System and Microstructural Characteristics

Metal (Ag/Ti)-Containing Hydrogenated Amorphous Carbon Nanocomposite Films with Enhanced Nanoscratch Resistance: Hybrid PECVD/PVD System and Microstructural Characteristics

Mechanical and Tribological Properties of Epitaxial Cubic Boron Nitride Thin Films Grown on Diamond

Mechanical, tribological, and stress analyses of ion-beam-deposited boron-rich boron nitride films with increasing N content

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