DLC coating on a trench-shaped target by bipolar PBII

Nakahara, Yuya; Kato, Takahisa; Choi, Junho

doi:10.1016/j.ijrmhm.2014.08.005

Cited by 22 publications

(14 citation statements)

References 21 publications

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“…These Raman spectroscopic analysis results also strengthen this conclusion, i.e., the ratio of boron and nitride limits the amount of carbon that can be incorporated into the film. If there is a defect in the film structure, the G peak position and the I(D)/I(G) value increase, whereas FWHM(G) decreases [ 35 , 36 ]. This has also clarified that this Raman parameter shows an opposite tendency when the film quality is improved by the ion assist method [ 37 ] or by increasing the incident energy of ions [ 38 ], i.e., the G peak position and the I(D)/I(G) value decrease, whereas FWHM(G) increases.…”

Section: Resultsmentioning

confidence: 99%

Structural and Mechanical Properties of a-BCN Films Prepared by an Arc-Sputtering Hybrid Process

et al. 2021

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Amorphous boron carbon nitride (a-BCN) films exhibit excellent properties such as high hardness and high wear resistance. However, the correlation between the film structure and its mechanical properties is not fully understood. In this study, a-BCN films were prepared by an arc-sputtering hybrid process under various coating conditions, and the correlations between the film’s structure and mechanical properties were clarified. Glow discharge optical emission spectroscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and Raman spectroscopy were used to analyze the structural properties and chemical composition. Nanoindentation and ball-on-disc tests were performed to evaluate the hardness and to estimate the friction coefficient and wear volume, respectively. The results indicated that the mechanical properties strongly depend on the carbon content in the film; it decreases significantly when the carbon content is <90%. On the other hand, by controlling the contents of boron and nitrogen to a very small amount (up to 2.5 at.%), it is possible to synthesize a film that has nearly the same hardness and friction coefficient as those of an amorphous carbon (a-C) film and better wear resistance than the a-C film.

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Section: Resultsmentioning

confidence: 99%

Structural and Mechanical Properties of a-BCN Films Prepared by an Arc-Sputtering Hybrid Process

et al. 2021

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“…We take a twostep iterative approach to implement a fast solution to solve Poisson's equation. To this end, we first transform Poisson's equation into a linear system like (5), where K is a global matrix. Then, we use the parallel Krylov subspace (KSP) iterative method [29] from the PETSc library [30] to solve this linear equation.…”

Section: Parallel Solution Of Poisson's Equation In Picmentioning

confidence: 99%

“…We use Dataset 1 to validate our implementation and the other five different datasets for performance tests. The solver converts the number density 5 of realistic particles to the corresponding density of simulation particles using a scaling factor given in Table I. The scaling factor indicates the number of real particles to be represented by a simulation particle.…”

Section: Simulation Setupmentioning

confidence: 99%

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Parallelizing and Balancing Coupled DSMC/PIC for Large-scale Particle Simulations

Qiu

et al. 2022

2022 IEEE International Parallel and Distributed Processing Symposium (IPDPS)

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Particle simulations are important workloads in high performance and parallel computing. Due to massive particle migration between parallel processes during simulations, efficient and balanced parallel computing is a practical challenge in large-scale realistic particle applications. This paper proposes a novel approach to enable highly-efficient dynamic load balance in a coupled DSMC/PIC solver for large-scale numerical simulations of the plasma plume. We employ dual unstructured grids of different granularity, with a coarse grid for DSMC simulations of flow fields and an embedded fine grid for PIC simulations of electric fields, to facilitate coupled DSMC/PIC calculation and grid partition for parallel computing. We then design and implement a centralized as well as a distributed communication strategies to dynamically migrate particles among arbitrary parallel processes. During the timestep iterations, we present a lightweight dynamic load balancer, composed of a load imbalance factor, a weighted load model and an efficient grid remapping mechanism, to adaptively rebalance the simulation among parallel processes with little extra overheads. We perform 3D unsteady simulations of the plasma plume induced by the pulsed vacuum arc in a cylindrical nozzle with hydrogen atoms and ions to validate the coupled solver. Parallel performance results scaling up to thousands of processes with billions of particles demonstrate the efficiency and effectiveness of our dynamic load balancer and parallel implementation.

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“…Plasma plumes exist widely in aerospace propulsion [1], industrial coating [2,3] and nuclear reactors [4,5] such as plasma thrusters in the aerospace propulsion system [6] and micro-cathode vacuum arc thrusters for microsatellites [7]. In the thruster devices described above, plasma is injected to the environmental medium at an extremely high speed, and a feather-like jet flow called a plume is diffused into the surrounding environment rapidly.…”

Section: Introductionmentioning

confidence: 99%

Study on Chemical Reactions of Ions and Neutral Particles on the Wall with DSMC Method

Su¹,

Li²,

Fan³

2018

Proceedings of the 2018 3rd International Conference on Automation, Mechanical Control and Computational Engineering (AMCCE 201

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Abstract. Plasma plumes exist widely in the electric propulsion systems. Neutral particles, ions, and metal particles are included in the flow field. Complex collisions occur between the particles. Particles will collide with the wall surface when they move towards the wall, then some particles will reflect back, the others will react on the wall with a certain probability. Chemical reactions on the wall have a significant effect on the distribution of the particles and lead to the change of density in the flow field. The chemical reaction models on the wall are studied based on the direct simulation of Monte Carlo method (DSMC). Five types of particles including molecular hydrogen H 2 , atomic hydrogen H, atomic Titanium Ti, ion H 2 + , and ion H + are studied in the flow field, there are chemical reactions for these particles with a certain probability on the wall. The numerical simulation results show that the number density of molecular hydrogen H 2 increases obviously, the number density of atomic hydrogen H increases slightly, and the number density of ion H + decreases significantly after adding the chemical reaction models on the wall, indicating that the chemical reactions on the wall have a significant influence on the distribution of the particles in the flow field. The study in this paper provides basic data for further research on plasma plumes by the numerical simulation.

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DLC coating on a trench-shaped target by bipolar PBII

Cited by 22 publications

References 21 publications

Structural and Mechanical Properties of a-BCN Films Prepared by an Arc-Sputtering Hybrid Process

Structural and Mechanical Properties of a-BCN Films Prepared by an Arc-Sputtering Hybrid Process

Parallelizing and Balancing Coupled DSMC/PIC for Large-scale Particle Simulations

Study on Chemical Reactions of Ions and Neutral Particles on the Wall with DSMC Method

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