Role of annealing temperatures on the evolution of microstructure and properties of Cr2O3 films

He, Ning; Li, Ji; Liu, Xiaohong; Li, Hongxuan; Zhou, Hang; Chen, Jianmin

doi:10.1016/j.apsusc.2015.10.023

Cited by 13 publications

(2 citation statements)

References 22 publications

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“…It was reported that the crystal growth was closely associated with the temperature and time of heat treatment. By differential scanning calorimetry and thermogravimetric analysis, He et al [23] also found that the crystallization and vaporization temperatures of the AIP Cr2O3 film are 360 °C and 940 °C, respectively. Their research results further revealed that the grain size of the Cr2O3 film clearly increased after annealing above the crystallization temperature.…”

Section: Percentage Of Crack Area For the Heat-treated Cr 2 O 3 Filmmentioning

confidence: 99%

In-Situ Heat Treatment Study on the Nanocrystalline Cr2O3 Film Using an Environmental Scanning Electron Microscope

et al. 2017

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Abstract:In this work, the surface morphology changes of nanocrystalline Cr 2 O 3 film deposited on Si wafer during the heating process were observed in-situ by means of an environmental scanning electron microscope (ESEM). The Cr 2 O 3 film cracked at high temperature due to the cause of thermal stress; the corresponding crack area percentages on the film surface were real-time evaluated using image analysis software (SISC IAS V8.0) based on the principle of gray value analysis. In the meantime, the effects of the heating temperature on the crack area percentage, phase constituents, and grain size of the Cr 2 O 3 film were also studied in detail. The results showed that the percentage of crack area on film surface first increased with the heating temperature rise, and reached the maximum value at around 980 • C, and then gradually declined again. The above trend is closely related to the changes of thermal stress and grain growth in film. In addition, the heat treatment also had a strong influence on the grain size of the Cr 2 O 3 film.

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Section: Percentage Of Crack Area For the Heat-treated Cr 2 O 3 Filmmentioning

confidence: 99%

In-Situ Heat Treatment Study on the Nanocrystalline Cr2O3 Film Using an Environmental Scanning Electron Microscope

et al. 2017

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“…Remarkable achievements have been made in many high technology fields [1][2][3]. Compared with thermal spraying [4][5], laser cladding [6], thin film deposition [7,8] and other technologies, the preparation process of adhesive solid lubricant coating is undoubtedly the most economical and feasible [9][10].Bonded solid lubrication coating is not only economical but also excellent in tribological properties. Currently, more than 95% of the lubricating materials achieve the lubrication performance through spraying technology to reduce the friction and wear [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Tribological Performance Testing of Bonded Solid Lubricating Coatings Used on Spherical Plain Bearings

Zhang¹,

Qiu²,

Li³

et al. 2017

Proceedings of the 3rd Annual International Conference on Advanced Material Engineering (AME 2017)

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Abstract.To solve the lubricating problems of spherical plain bearings under high-low temperature, high vacuum, heavy loads and strong oxidation conditions, the PTFE and MoS2 based lubricating coatings were prepared on the inner rings of the spherical plain bearings by spraying technique. A self-made tribo-tester was used to investigate the friction coefficient, wear loss, and friction temperature increase of bearings with coatings under different oscillation frequencies. Using scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), the worn surfaces of the coatings and the counter surfaces were characterized and analyzed. The results showed that PTFE and MoS2 based lubricating coatings significantly improved the tribological properties of the spherical plain bearings. The tribological performance of PTFE based coating was obviously superior to MoS2 based coating and its wear mechanism was adhesive wear. However, the MoS2 based coating mainly occurred severe adhesive wear and abrasive wear, and the tribological properties of spherical plain bearings with MoS2 coating were relatively optimal under low frequencies. This paper provides a reference to developing new lubricating techniques for the spherical plain bearings. IntroductionBonded solid lubrication coating is an effective solution to solve the lubrication and wear problems under harsh conditions of high-low temperature, high vacuum, heavy loads and strong oxidation conditions. Remarkable achievements have been made in many high technology fields [1-3]. Compared with thermal spraying [4][5], laser cladding [6], thin film deposition [7,8] and other technologies, the preparation process of adhesive solid lubricant coating is undoubtedly the most economical and feasible [9][10].Bonded solid lubrication coating is not only economical but also excellent in tribological properties. Currently, more than 95% of the lubricating materials achieve the lubrication performance through spraying technology to reduce the friction and wear [11]. Molybdenum disulfide (MoS2) has the six-party crystal structure formed by S-Mo-S covalent, which is similar to the "sandwich layer", and easily to slip and transfer into lubricant film on the contact surfaces [12] and its application in sliding contact surface can reduce the wear degree of the structure [13][14].However, pure MoS2 coatings in the wet air environment present is easy to be oxidized and leads to low hardness, resulting in poor wear resistance and limited application [15][16]. Polytetrafluoroethylene (PTFE) is widely used as a solid lubricant because of its excellent selflubricating property, low friction coefficient, thermal stability and chemical stability. But PTFE as wear-resistant materials can`t be used alone because of its low mechanical strength, poor wear resistance, and cold flow phenomenon [17][18][19]. The tribological performance of the organic solvent

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A chromium(III) oxide-coated steel wire prepared by arc ion plating for use in solid-phase microextraction of aromatic hydrocarbons

Ran

Wang

et al. 2017

Microchim Acta

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The authors introduce an arc ion plating method for the deposition of chromium oxide (CrO) on a steel wire substrate, and its use as a coating for solid phase microextraction. The coating has a micro- and nano-scaled structure after annealing at 700 °C. It is found that CrO exhibits a good extraction capability for the aromatic hydrocarbons naphthalene, anthracene, fluorene, fluoranthene, and biphenyl. Following desorption by high temperature at 300 °C, the analytes were quantified by gas chromatography (GC). The limits of detection are in the range between 20 and 200 ng·L, and calibration plots are linear within a wide range (0.2 to 400 μg·L). The coating has excellent mechanical properties, with a hardness is as high as 31.7 GPa, and the adhesion strength between coating and substrate reaches 20.1 N (corresponding to the critical Hertzian contact stress of 10 GPa). This, along with the chemical and thermal stability of the CrO coating, endows the wire with a long operational life. It was used for at least 100 times without any obvious decline of extraction capability. Graphical abstract An arc ion plating method was introduced for the deposition of chromium oxide (CrO) on a steel wire substrate, and its use as a coating for solid phase microextraction with high mechanical strength, stability, and long operational lifetime.

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Role of annealing temperatures on the evolution of microstructure and properties of Cr2O3 films

Cited by 13 publications

References 22 publications

In-Situ Heat Treatment Study on the Nanocrystalline Cr2O3 Film Using an Environmental Scanning Electron Microscope

In-Situ Heat Treatment Study on the Nanocrystalline Cr2O3 Film Using an Environmental Scanning Electron Microscope

Preparation and Tribological Performance Testing of Bonded Solid Lubricating Coatings Used on Spherical Plain Bearings

A chromium(III) oxide-coated steel wire prepared by arc ion plating for use in solid-phase microextraction of aromatic hydrocarbons

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