Author
M. Aggleton
Bio: M. Aggleton is an academic researcher from University of California, Irvine. The author has contributed to research in topics: Diamond-like carbon & Material properties of diamond. The author has an hindex of 2, co-authored 2 publications receiving 26 citations.
Papers
More filters
TL;DR: The tribological behavior of steel and sapphire sliding on a sputtered MoS2+Ti coating was studied in ultra-high vacuum as a function of temperature over the range of 4-300 K.
20 citations
TL;DR: Friction measurements have been performed on microcrystalline, ultrananocrystalline and diamond-like carbon (DLC) films with natural diamond counterfaces in the temperature range of 8 K to room temperature.
Abstract: Friction measurements have been performed on microcrystalline, ultrananocrystalline, and diamond-like carbon (DLC) films with natural diamond counterfaces in the temperature range of 8 K to room temperature. All films exhibit low friction (μ≤0.1) in air at room temperature. In ultrahigh vacuum, microcrystalline diamond quickly wears into a high friction state (μ≈0.6), which is independent of temperature. DLC has low friction even at the lowest temperatures. In contrast, friction in ultrananocrystalline films has a significant temperature dependence, with a broad transition from a low to a high friction state between 120 and 220 K observed on both heating and cooling. The role of hydrogen transport in determining the temperature dependence of friction is discussed.
14 citations
Cited by
More filters
TL;DR: In this article, the authors present a focused review of solid lubrication with molybdenum disulfide by highlighting its structure, synthesis, applications and the fundamental mechanisms underlying its lubricative properties, together with a discussion of their environmental and temperature dependence.
Abstract: Molybdenum disulfide (MoS2) is one of the most broadly utilized solid lubricants with a wide range of applications, including but not limited to those in the aerospace/space industry. Here we present a focused review of solid lubrication with MoS2 by highlighting its structure, synthesis, applications and the fundamental mechanisms underlying its lubricative properties, together with a discussion of their environmental and temperature dependence. The review also includes an extensive overview of the structure and tribological properties of doped MoS2, followed by a discussion of potential future research directions.
257 citations
TL;DR: In this article, a review of the literature about self-lubricating metallic composites containing MoS2 is presented, in particular those analyzing the possible reactions during processing, which are often neglected or even unknown in a variety of publications.
169 citations
TL;DR: In this article, the morphological influence of molybdenum disulfide (MoS2) on the tribological properties of rapeseed oil (RO) was investigated.
Abstract: The morphological influence of molybdenum disulfide (MoS2) on the tribological properties of rapeseed oil (RO) was investigated. MoS2 nano-vesicles improved the tribological properties of RO, especially the wear resistance. However, nano-platelets and micro-platelets weakened the wear resistance because of their bad dispersibility in RO. Positive synergistic lubrication was observed between nano-vesicles and nano-platelets, but not between nano-vesicles and micro-platelets or nano-platelets and micro-platelets. Abrasive plowing is the main wear manner for the steel balls lubricated by RO or ROs with platelet-like MoS2. However, chemical corrosive wear occurred on the friction surface as lubricated by RO with nano-vesicles. The chemical corrosive wear confirmed the entering of MoS2 nano-particles to the contact area for lubrication. This lubrication of nano-vesicles was ascribed to their spherical structure and good dispersibility in RO. The nano-vesicles did not influence the stability of RO and assembled beside furrows to alleviate the wear. Thus, potential applications of MoS2 nano-vesicles in vegetable oils were revealed.
39 citations
TL;DR: In this paper, the friction and wear behavior of the ZrO 2 (Y 2 O 3 ) composite has been investigated from room temperature to 1000 ˚ C. The results show that the coefficient of frictions between 0.25 and 0.40 and wear rates between 1.71×10 −6 and 6.68× 10 −5 ǫ mm 3 /(Nm).
37 citations
TL;DR: In this paper, the contact region between a Si3N4 ball and a SiO2 plate with the lubrication of phosphoric acid solution is observed directly by an optical microscope combined with a Raman microscope to understand the superlubricity mechanism.
Abstract: In this work, the contact region between a Si3N4 ball and a SiO2 plate with the lubrication of phosphoric acid solution is observed directly by an optical microscope combined with a Raman microscope to understand the superlubricity mechanism. It is found that the wear on the friction surfaces mainly occurs at the beginning of the test and nearly disappears after the friction coefficient reduces to 0.05. When the superlubricity appears (μ = 0.004), there is only a limited amount of solution available to the contact (forming starvation state), resulting in an “H” distribution surrounding the contact region. Moreover, it is observed that the hydrogen bond effect in the solution is enhanced with time going by, and finally a thin film with hydrogen bond network among H3PO4, H2PO4−, and H2O is formed on the friction surfaces, leading to the superlubricity. By employing this direct observation approach, the structure of the confined solution and the superlubricity mechanism of phosphoric acid solution are finall...
34 citations