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A nanoscale monolithic slider-suspension produced by photolithography is used for contact recording. The contact pad consists of a multilayered structure consisting of SiC, amorphous hydrogenated carbon (a-C:H), Al 2 O 3 , Si, and Co-Nb-Zr films. In this study, we have compared hardness, Young's modulus of elasticity, and scratch resistance or adhesion of various coatings deposited...
Sliders having very small mass (less than 10 mg) are beginning to be used in magnetic recording devices and very light contacting loads (less than 1 μN) are expected to be used in ultrahigh-density recording devices using the point-recording technique. These newer devices will require wear rates that are virtually zero. The wear on such sliding surfaces is primarily due to the surface interaction...
In conventional pin-on-disk testing of the tribological characteristics of two different materials in sliding contact, the main parameters of interest are notably the friction and wear properties of the material pair. However, when two bodies consisting of hard and soft materials respectively are subjected to such testing, the appearance of a transfer film, or third body which can be a composite mixture...
We present results on nanoindentation and scratch testing on magnetic recording tape heads coated with sub-20nm amorphous carbon layers, prepared by filtered cathodic deposition and plasma enhanced chemical vapour deposition. The hardness values of the coated devices are higher than that of the sputtered Al 2 O 3 substrate. The coatings do not reduce friction but improve the scratch...
In conventional pin-on-disk testing of the tribological characteristics of two different materials in sliding contact, the main parameters of interest are notably the friction and wear properties of the material pair. However, when two bodies consisting of hard and soft materials, respectively, are subjected to such testing, the appearance of a transfer film, or third body, which can be a composite...
Fe-N/Ti-N magnetic multilayers with different thickness of Fe-N layers were deposited on Si (111) wafer by using magnetron sputtering technique. For comparison, Fe-N and Ti-N thin films were also prepared under the same conditions. Microhardness and reduced modulus of the multilayer were measured by using a nanoindenter with a diamond tip in conjunction with an atomic force microscope (AFM). Microfriction...
Fe–N/Ti–N multilayers with different thickness of Ti–N layers were deposited on Si(111) wafer by using magnetron-sputtering technique. For comparison, Fe–N and Ti–N single-layered films were prepared under the same condition. The microhardness and the reduced modulus of the multilayer were measured by using a nanoindentor with a diamond tip (Berkovich) in conjunction with an atomic force microscope...
Linear oscillating microwear experiments have been performed on thin diamond-like carbon (DLC) coatings on glass, using a Hysitron Triboscope with a conical diamond tip of 0.6μm tip radius and loads in the range of some milliNewtons.The friction coefficient μ has been determined as a function of load L and the number of wear cycles. The results can be understood in terms of a combination of Hertzian...
Many coatings and surface treatments have been developed to enhance component performance and, increasingly, coating architectures are becoming more complex as multilayer, superlattice and graded coating systems are becoming widely available. There are so many potential coating variants that it is almost impossible to test all the possibilities to optimise performance. Therefore the need for predictive...
Thin film deposition and coating techniques have been developed for tribological applications and constitute an optimized material solution. Nanoindentation testing at very low load is a successful technique for studying the mechanical properties of ceramic, metal and intermetallic thin films. Hardness, yield strength and elasticity modulus are the basic parameters for mechanical design. Nanohardness...
A surface modification technique, namely thermal oxidation (TO) treatment has been developed to improve the tribological properties of B2 iron aluminide. The composition, the microstructure and the mechanical properties, e.g. hardness and elastic modulus of the surface treated layers have been characterised using a number of analytical techniques including XRD, SEM, AFM and microindentation and nanoindentation...
This paper presents a study on using the superelastic NiTi alloy as an interlayer between CrN coating and aluminum substrate to improve the interface adhesion and wear resistance. Nanoindentation, scratch adhesion, and pin-on-disk wear measurements were conducted to study the adhesion and tribological behaviors of the layered coatings. We found that the superelastic interlayer could significantly...
In this study, nanosized hydroxyapatite (HA) particles were synthesized by precipitation process using Ca(NO 3 ) 2 ·4H 2 O and (NH 4 ) 2 HPO 4 at room temperature (25°C) and atmospheric pressure. Pressureless sintering (PS) was used for comparing the sinterability of HA/yttria-partially-stabilized zirconia composites. The nanohardness and elastic modulus...
α-Fe(Cr)-h-BN and α-Fe(Cr)-Fe 2 B-FeB coatings on X30Cr13 stainless steel are synthesized by laser melting with incorporation of hexagonal boron nitride, or by alloying of boron. The additive powders are deposited on steel before pulsed irradiation by Nd-YAG laser beam. The solidification structures of the obtained coatings are investigated by optical microscopy and X-ray diffractometry. The...
The cavitation erosion (CE) behaviour of four Zr-based bulk metallic glasses (BMGs) of general composition Zr–Al–CuNi(Co) was investigated by means of an ultrasonic vibration device and compared with that of S30431 austenitic stainless steel. The results show that the CE resistance of Zr-based BMGs, in terms of incubation time and maximum rate of erosion, is approximately 10 times higher than that...
Micro- and nano-sized hot-pressed silicon carbide pins have been characterized by room-temperature unlubricated disk-on-pin tribological tests on hot-pressed silicon carbide and silicon nitride discs. The mean grain size was shown not to influence the steady state friction coefficient. The mean grain size clearly affected the disc wear rate: the finer was the grain size the lower was the disc wear...
In nuclear power plants, tubes and guides of the rod cluster control assemblies undergo impacts at low contact pressures, which lead to a specific wear of the contact surfaces. The aim of this paper is to propose a first explanation of this particular wear with the help of finite element simulations and experimental observations. In a first part, we present some experimental observations, obtained...
The present investigation of a unidirectionally abraded pearlitic (0.4wt%C) steel and the steel with vanadium addition (0.1wt%V) elucidates the work hardening and the reorientation near the surface layer caused by abrasion, particularly its relation to the wear behavior. The abraded surfaces were examined with a nanoindentation apparatus to evaluate the variation of nanohardness and elastic modulus...
Abrasion induced subsurface deformation and work hardening along with related microstructural changes of the pearlitic (0.4%C) steel with vanadium additions has been examined. The abrasion testing was performed using a pin-abrasion apparatus in which a small pin of the specimen was ground on an abrasive paper at an applied load of 2.1N and a sliding speed of 0.66m/s. Crushed silica particles (size:...
Glancing angle deposition (GLAD) was used to sculpt chromium thin films sputter deposited by dc magnetron sputtering into the desired zigzag microstructure. The flux angle of incident species α was systematically varied from 0 to 50° and periodically changed from α to −α. The total film thickness was kept constant at 1μm and the number of periods ranged from 0.5 to 10. In order to improve the film...
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