The tribological properties of YBa2Cu3O7 films in ambient environment

Ding, Jianwen; Meng, Yonggang; Wen, Shizhu

doi:10.1016/s0043-1648(01)00596-8

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…On the other side, depletion of Ba (figure 7(d)) was clearly observed at the same places. This suggests that the outgrowths may be composed of CuO, Y 2 O 3 , CuYO 2 or Y 2 Cu 2 O 5 , as was also reported in [23][24][25][26][27][28].…”

Section: Structural Investigationsupporting

confidence: 71%

Non-uniformity of coated conductor tapes

Solovyov

Pardo

Šouc

et al. 2013

Supercond. Sci. Technol.

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Non-uniformity of superconductor properties, e.g. a critical current reduction close to the edge of a coated conductor (CC) tape could degrade its performance in some power applications. Reliable characterization of such non-uniformity and understanding of its mechanism requires investigation of the character and causes of degradation. In this paper spatial distribution of critical current density across the width of a CC tape is studied. Three different experimental methods allowing estimation of the local current density were utilized for this purpose: (i) magnetic field mapping above the tape through which a DC current is flowing, (ii) measurement of the critical current of separate strips prepared by patterning of the CC tape, and (iii) magnetization measurements of the pieces cut from various positions within the tape width. Very good agreement between the results obtained by these methods was found, showing a reduction of the critical current density at the tape edges with respect to its centre. Moreover, structural investigation by scanning electron microscopy revealed a correlation between the morphology and the critical current density across the tape width. Insertion of such real non-uniform distribution of critical current density into AC loss calculation resulted in a dramatic improvement in the agreement with experimental results.

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Section: Structural Investigationsupporting

confidence: 71%

Non-uniformity of coated conductor tapes

Solovyov

Pardo

Šouc

et al. 2013

Supercond. Sci. Technol.

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“…Yue et al (1993) have investigated the coefficient of friction of YBCO-YBCO and YBCO-Ag ball-on-flat couples and found the stable coefficient of friction of YBCO in the steady state varies from 0.9 to 0.26 and from 0.8 to 0.26 depending on temperature for a constant load of 2.2 N and speed of 0.020 or 0.013m/s corresponding to YBCO and Ag couples, respectively. Ding et al (2001) have investigated the tribological properties of YBCO film in ambient environment and the results showed that the friction coefficient of YBCO films was lower and more stable than that of polysilicon films when sliding against a sapphire ball or a steel ball. Ding et al (2008) have studied the mechanical and tribological properties of YBCO/Ag composites and found Ag particle in matrix improved the mechanical and tribological properties of YBCO.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Coefficient of Friction of YBa2Cu3O7-δ/Graphene Oxide Composites

Chu

2016

International Journal of Surface Engineering and Interdisciplinary Materials Science

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YBa2Cu3O7-d/graphene oxide (YBCO/GO) composite materials were fabricated by using powder metallurgy process combined with cold isostatic pressing (CIP) technique. The coefficient of friction (COF) of YBCO matrix composites with addition of 0, 0.5, 1.0 and 2.0 wt% GO were reported for the first time. The friction behavior was observed by means of the ball-on-disk technique with a steel ball used as the counterpart in ambient atmospheric and dry sliding condition. The measured properties were then assessed with respect to sliding speed and the mass fraction of the GO additives. GO is able to reduce COF and brittleness for YBCO ceramic. The excellent performance offers materials with 0.5 wt% GO, which has the lowest COF and lightest wear track.

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“…Especially, the initial friction properties influence the stability of microdevice. A number of studies have been conducted to measure static friction in a microdevice interface and to develop solid lubricant films to minimize friction and wear [1,2]. Polysilicon thin films have been widely employed as structural materials in microelectromechanical systems.…”

Section: Introductionmentioning

confidence: 99%

The Initial Sliding Microfriction Properties of Polysilicon Films

Ding¹,

Yang²,

Cai³

2002

International Journal of Nonlinear Sciences and Numerical Simulation

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In the present study, polysilicon films were prepared to investigate the initial sliding microfriction properties using a ball-on-flat micro tribometer when samples were moved against a sapphire ball and a steel ball in ambient environment. The surface topography was measured with AFM. The experimental results indicate that the initial microfriction of polysilicon films fluctuates during a cycle period when sliding against a sapphire ball and this has limited the reliability of present microdevices, but it is stable when sliding against steel ball. This clearly shows the friction force not corresponding to the surface-roughness at low load and electronic contributions to friction should be considered at microfriction. As can be seen from the theory of the contribution to sliding friction from electronic excitations and the experiments above, the polysilicon films can be used in MEMS when sliding against a metal film to get good microfriction properties.

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The tribological properties of YBa2Cu3O7 films in ambient environment

Cited by 6 publications

References 15 publications

Non-uniformity of coated conductor tapes

Non-uniformity of coated conductor tapes

Preparation and Coefficient of Friction of YBa2Cu3O7-δ/Graphene Oxide Composites

The Initial Sliding Microfriction Properties of Polysilicon Films

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