Combination of different plasma assisted processes with pulsed d.c.: cleaning, nitriding and hardcoatings

Grün, Reinar

doi:10.1016/0257-8972(95)08310-3

Cited by 7 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Plasma based surface cleaning uses a mixture of ions, electrons, neutrals and excited species to interact with the compounds on a surface, leading to chemical and physical interactions. Previous works already showed 2-11 the ability to reduce the amount of carbon based residues on metallic surfaces and is already used as pre-treatment in plasma nitriding process for example 11 . However, there are still difficulties with this technique, as the large chemical variety of existent organic contaminants, which leads to the functionalization of organic residues and formation of polymeric compounds that show resistance to degradation 11 .…”

Section: Introductionmentioning

confidence: 99%

“…Previous works already showed 2-11 the ability to reduce the amount of carbon based residues on metallic surfaces and is already used as pre-treatment in plasma nitriding process for example 11 . However, there are still difficulties with this technique, as the large chemical variety of existent organic contaminants, which leads to the functionalization of organic residues and formation of polymeric compounds that show resistance to degradation 11 . To overcome those difficulties, more research is necessary, because there are many ways to produce active species as well the plasma itself, and so, there are many ways to increase the reactions that leads to degradation instead of polymerization.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of sample temperature and applied power on degradation of stearic acid in inductively coupled radio frequency plasma

et al. 2014

View full text Add to dashboard Cite

Plasma cleaning is a promising technology in surface treatments, despite technological interest its use is limited because its mechanisms still are not entirely understood. This work aims to evaluate how the applied power of an inductively coupled RF discharge at 13,56 MHz, with Ar and Ar+10%O 2 atmospheres, affects its capabilities to etch an organic molecule. Mass variation rate was used as direct characterization of degradation process and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) was performed to search for residual molecular modifications. Additionally, optical emission spectroscopy (OES) measurements were performed to monitor the offer of active species in the gaseous volume. In experimental conditions was possible attain mass reduction from sample, with higher mass loss rate when applied power is increased. Material characterization shows the possibility of attain a high etch rate, while no structural modifications were detected, if the temperature is controlled.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of sample temperature and applied power on degradation of stearic acid in inductively coupled radio frequency plasma

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Since the adhesion of the Chromium Nitride coating and substrate is low therefore the wear resistance of the Chromium Nitride coating is reduced when the applied load is higher than the critical value [15]. Another kind of coatings are cermets, which have characteristics such as high hardness, high wear resistance, low friction coefficient and high corrosion resistance which have lead to their wide use in different industries [16,17]. Some examples are Cr 3 C 2 -NiCr cermet carbide coating on AISI 316 Molybdenum steel using HVOF thermal spray and TiC-Fe cermet coating on 304 stainless steel using electrical discharge coating (EDC) [18,19].…”

Section: Introductionmentioning

confidence: 99%

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

Azhideh

Aghajani

Pourbagheri

2017

Metals

View full text Add to dashboard Cite

Abstract:In this paper the influence of spark energy on corrosion resistance, hardness, surface roughness and morphology of WC-Co coated 36Cr-Ni-Mo4 steel by Micro-Electro Welding (MEW) was investigated. Frequencies of 5, 8 and 11 kHz, currents of 15, 25 and 35 A and duty cycles of 10, 30 and 50 % were applied for coating of the samples using a WC-Co cermet electrode. The results indicate that increasing the current, Duty cycle and frequency of the process increases spark energy. As spark energy increases, efficiency of coating increases to 80% and then decreases. X-ray diffraction (XRD) analysis was used to identify the phases. The results indicated that other than the peaks obtained for the metallic Iron with BCC (Body Centered Cubic) structure, Tungsten Carbide, Cr 7 C 3 and Titanium Carbide phases were also seen on the surface. Vickers micro hardness method was used for hardness measurement of the samples. Surface hardness increases to 817.33 HV0.05 with spark energy increasing up to 1.03 mJ, and then reducing. Optical Microscopy (OM) and scanning electron microscopy (SEM) to study Microstructural and atomic force microscopy (AFM) to study the topography, morphology and roughness were used. Polarization technique in 3.5 wt % NaCl solution was used to evaluate the corrosion properties. The results of the energy dispersive X-ray spectroscopy (EDS) analysis indicate that with increasing spark energy, the amount of Tungsten in surface increases to 41.95 wt % and then decreases. As spark energy increases up to 2.17 mJ, thickness of coating increases to 8.31 µm and then decreases. As spark energy increases, surface roughness is also increased. Corrosion test results indicated that the lowest corrosion rate (2.6 × 10 −8 mpy) is related to the sample with the highest level of efficiency.

show abstract

“…Pulsed glow discharge plasma techniqueshave been extensively studied in the past decades forsurface coating [1][2] , plasma nitriding [3][4] , combination duplex treatment of nitriding plus coating [5][6] and plasma ion implantation [7][8] . Pulsed glow discharge plasmasare known [9][10] to provide high peak voltage and high peak current at the same average power levelwhen compared to normal, constant voltageDC glow discharge plasmas and therefore high ionization and excitation would be expected during the pulsed glow discharge plasma process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitriding Time on the Structural Evolution and Properties of Austenitic Stainless Steel Nitrided Using High Power Pulsed DC Glow Discharge Ar/N2 Plasma

Yang

Kitchen

Luo

et al. 2016

J. Coat. Sci. Technol.

View full text Add to dashboard Cite

A high power pulsed DC glow discharge plasma (HPPGDP) system was employed to perform fast nitriding of AISI 316 austenitic stainless steel in Ar and N2 atmosphere. In-situ optical emission spectroscopy and Infrared pyrometer measurements were used during the plasma nitriding to investigate the effect of dynamic plasma on the nitriding behaviour. SEM and EDX, XRD, Knoop indentation, and tribo-tests were used to characterize microstructures and properties of the nitrided austenitic stainless steel samples.HPPGDP produced high ionization of both Ar and N2in the plasma that corresponded to dense ion bombardment on the biases steel samples to induce effective plasma surface heating and to form high nitrogen concentration on the biased steel surfaces, and therefore fast nitriding (> 10µm/hour) was achieved. Various phases were identified on the nitrided stainless steel samples formed from a predominantly a single phase of nitrogen supersaturated austenite toa multi-phase structure comprising chromium nitride, iron nitride and ferrite dependent on the nitriding time. All the nitrided AISI 316 austenitic stainless steel samples were evaluated with high hardness (up to 17.3 GPa) and exceptional wear resistance sliding to against hardened steel balls and tungsten carbide balls.

show abstract

Combination of different plasma assisted processes with pulsed d.c.: cleaning, nitriding and hardcoatings

Cited by 7 publications

References 3 publications

Evaluation of sample temperature and applied power on degradation of stearic acid in inductively coupled radio frequency plasma

Evaluation of sample temperature and applied power on degradation of stearic acid in inductively coupled radio frequency plasma

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

Effect of Nitriding Time on the Structural Evolution and Properties of Austenitic Stainless Steel Nitrided Using High Power Pulsed DC Glow Discharge Ar/N2 Plasma

Contact Info

Product

Resources

About