Tribological properties of smooth polycrystalline diamond films

Bögli, U.; Blatter, A.; Pimenov, S.M.; Obraztsova, E. D.; Smolin, A.A.; Maillat, M.; Leijala, A.; Burger, J.P.; Hintermann, H.E.; Loubnin, E.N.

doi:10.1016/0925-9635(95)00272-3

Cited by 29 publications

(7 citation statements)

References 7 publications

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“…The uneven wear rate is a result of the mechanical polishing of diamond being highly dependent upon both the crystallographic orientation of the diamond and the azimuthal angle of polishing [ 12 , 13 ]. As stated, the surface roughness of NCD thin films is a result of crystallographic orientation variation; therefore, this type of polishing can lead to protruding crystals left behind on the film surface [ 14 ]. Potential shattering is the result of the high pressures typical of mechanical polishing and the characteristic wafer bow of NCD thin films [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of slurry composition on the chemical mechanical polishing of thin diamond films

Werrell

Mandal

Thomas

et al. 2017

Science and Technology of Advanced Materials

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Nanocrystalline diamond (NCD) thin films grown by chemical vapour deposition have an intrinsic surface roughness, which hinders the development and performance of the films’ various applications. Traditional methods of diamond polishing are not effective on NCD thin films. Films either shatter due to the combination of wafer bow and high mechanical pressures or produce uneven surfaces, which has led to the adaptation of the chemical mechanical polishing (CMP) technique for NCD films. This process is poorly understood and in need of optimisation. To compare the effect of slurry composition and pH upon polishing rates, a series of NCD thin films have been polished for three hours using a Logitech Ltd. Tribo CMP System in conjunction with a polyester/polyurethane polishing cloth and six different slurries. The reduction in surface roughness was measured hourly using an atomic force microscope. The final surface chemistry was examined using X-ray photoelectron spectroscopy and a scanning electron microscope. It was found that of all the various properties of the slurries, including pH and composition, the particle size was the determining factor for the polishing rate. The smaller particles polishing at a greater rate than the larger ones.

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Section: Introductionmentioning

confidence: 99%

Effect of slurry composition on the chemical mechanical polishing of thin diamond films

Werrell

Mandal

Thomas

et al. 2017

Science and Technology of Advanced Materials

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“…Due to the large amounts of dangling bonds which are not saturated by adsorbed species in vacuum, the adhesion theory successfully explains the frictional mechanism of diamond sliding on diamond in vacuum exhibiting higher friction coefficient value (0.5-1 compared to values between 0.05-0.15 in air) by forming intense adhesive. 14,17,19,[33][34] The sp 2 -C phase is thought to be a softer and low-shear strength phase corresponding to the possible formation of a carbonaceous tribolayer at the sliding interface. 11,14,31 Several studies found that diamond materials with increased sp 2 fractions exhibit lower friction and wear by making films more lubricious.…”

Section: Introductionmentioning

confidence: 99%

Understanding integrated effects of humidity and interfacial transfer film formation on tribological behaviors of sintered polycrystalline diamond

2015

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Polycrystalline diamond (PCD) used in down-hole tool applications is ideally suit for harsh environments such as drilling at circulation break and poor lubrication, in which the water molecules of physical and chemical adsorption can severely affect the tribochemistry effect across cutting interface. Here, tribological behaviors of PCD are studied in a controlled humid atmosphere (5%-50% RH). The friction coefficient is ~ 0.04 under 5% RH condition, which is significantly increased to ~ 0.11 under 50% condition.The run-in period and wear rate of PCD decrease while increasing RH levels during the tribotest. Such an ultra-low friction coefficient regime is explained coincide with the formation of efficient carbonaceous transfer films in the run-in periods through ex situ, micro-laser Raman spectroscopy and Atomic Force Microscope (AFM) measurements.Abstract graph: This paper highlights an intimate relationship among RH levels, dangling bonds passivation, run-in periods, transfer films formation and tribological behaviors.3 bits due to its extremely high wear resistance, high hardness and excellent toughness.Among these applications, fluids such as water, drilling mud and gas, are always required to lubricate the surfaces and interfaces of PCD in down-hole applications and its counter frictional pair. 1-4 Previous works have focused on that diamond rubbing against diamond in the presence of oil and water based drilling fluids had a coefficient of friction between 0.05 and 0.08. 5 Sexton et al. 6 investigated the bearing wear rates in laboratory testing and results showed that PCD thrust bearings provide a long-lasting bearing solution for down-hole drilling tools. Knuteson et al. 7 reported that the friction coefficient values of PCD thrusting bearing decreased in the lubrication regime moving from boundary to mixed-mode and may even become hydrodynamic. Mehan et al. 8 measured the wear rates of PCD and pointed out that wear mechanism of PCD was the result of diamond particles falling off in pin-on-disk tribometer experiments. However, the above works only concentrated on the mechanical aspects of wear performance and have not addressed the role of service environment factors on the friction coefficient, wear and ultimate failure wear of PCD. Considering the operating conditions such as high speeds, high loads, run-in period, frequent starting and stopping, cyclic fluctuating loads and extreme conditions such as drilling at circulation break and poor lubrication, the PCD contact surfaces cannot be ensured keeping in liquid lubrication condition all the time. We have confirmed from tribological behaviors of PCD under different relative humidity (RH) that friction coefficient, wear and adhesion behaviors are significantly affected by the adsorbed water molecules which can have distinct impacts on physical and chemical properties of solid surfaces. Understanding the effects of the relative humidity on sliding interface would be 5 formation of a transfer layer, possibly graphitic in nature. 19 Transfer films are known t...

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“…In this study, the surface roughness of Al 2 O 3 ball is approximately 10 times as high as that of other mating balls, as shown in Table. 1. Researchers [17,23,33] demonstrated that the rough surface not only gives a high COF during the longer running-in period, but also governs the overall tribological behavior.…”

Section: Tribological Mechanism Of the Pcd/al 2 O 3 Tribopairmentioning

confidence: 99%

Effect of sliding mating materials on vacuum tribological behaviors of sintered polycrystalline diamond

Sha

Yue

Zhao

et al. 2016

International Journal of Refractory Metals and Hard Materials

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Tribological properties of smooth polycrystalline diamond films

Cited by 29 publications

References 7 publications

Effect of slurry composition on the chemical mechanical polishing of thin diamond films

Effect of slurry composition on the chemical mechanical polishing of thin diamond films

Understanding integrated effects of humidity and interfacial transfer film formation on tribological behaviors of sintered polycrystalline diamond

Effect of sliding mating materials on vacuum tribological behaviors of sintered polycrystalline diamond

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