Protective coatings of nanophase diamond deposited directly on stainless steel substrates

1996 ◽  
Vol 11 (8) ◽  
pp. 2042-2050 ◽  
Author(s):  
F. Davanloo ◽  
H. Park ◽  
C. B. Collins
Keyword(s):  
Stainless Steel ◽  
High Speed ◽  
Protective Coatings ◽  
Diamond Films ◽  
Erosive Wear ◽  
High Energy ◽  
Industrial Applications ◽  
Carbon Ions ◽  
Interfacial Layers ◽  
Steel Substrates

Composed of sp3 bonded nodules of carbon, nanophase diamond films are deposited in vacuum onto almost any substrate by condensing carbon ions carrying keV energies. These multiply charged ions are obtained from the laser ablation of graphite at intensities in excess of 1011 W cm−2. The high energy of condensation provides both the chemical bonding of such films to a wide variety of substrates and low values of residual compressive stress. Coatings of 2–5 μm thickness have extended lifetimes of materials such as Si, Ti, ZnS, ZnSe, and Ge against the erosive wear from high-speed particles by factors of tens to thousands. In this research emphasis has been placed on studies of the bonding and properties realized by the direct deposition of nanophase diamond films on stainless steel substrates. Examinations of interfacial layers showed deep penetrations of carbon atoms into steel substrates. Resistances to low and high impact wear estimated by a tumbler device and a modified sand blaster, respectively, and results indicated significant increases in the lifetime of stainless steel samples. The characterization studies in this work demonstrated nanophase diamond as an attractive material for use as a protective coating in current industrial applications.

Infrared optical properties of pulsed laser deposited carbon films with the bonding and properties of diamond

1995 ◽  
Vol 10 (10) ◽  
pp. 2548-2554 ◽  
Author(s):  
F. Davanloo ◽  
J.H. You ◽  
C.B. Collins
Keyword(s):  
Optical Properties ◽  
High Speed ◽  
Erosive Wear ◽  
High Energy ◽  
Carbon Films ◽  
Optical Parameters ◽  
Free Carrier Absorption ◽  
Transmission Spectra ◽  
Carbon Ions ◽  
Optical Applications

Composed of packed nanophase nodules in which the carbon atoms are linked with the tetrahedral bonding of diamond, laser plasma films are deposited in vacuum onto almost any substrate by condensing carbon ions carrying keV energies. These multiply charged ions are obtained from the laser ablation of graphite at intensities in excess of 1011 W cm−2. The high energy of condensation provides both for the chemical bonding of such films to a wide variety of substrates and for low values of residual compressive stress. Coatings of 2–5 μm thicknesses have extended lifetimes of important optical materials against the erosive wear from high-speed particles and droplets by factors of tens to thousands. In this work, the optical properties of these films at infrared (IR) wavelengths were studied. Transmission spectra of several freestanding films on silicon frames were measured. Using a model considering rough surface scattering and free carrier absorption, satisfactory fits to these transmission spectra were obtained and from them the optical parameters were extracted. The characterization studies performed in this work indicated a great potential for the laser-deposited nanophase diamond films in optical applications.

Mechanism Analysis of Field Emission for Nano-Diamond Films on Stainless Steel Substrates

2019 ◽  
Vol 807 ◽  
pp. 82-86
Author(s):  
Shu Yi Wei ◽  
Shi Jin Liu ◽  
Xiu Xia Zhang ◽  
Li Xin Guo
Keyword(s):  
Thin Film ◽  
Stainless Steel ◽  
Field Emission ◽  
Glass Substrate ◽  
Screen Printing ◽  
Diamond Films ◽  
Emission Characteristics ◽  
Emission Model ◽  
Mechanism Analysis ◽  
Steel Substrates

In this paper, nanodiamond films (NDF) were prepared on glass substrate by screen printing with nanodiamond. The NDF was printed with two layers and treated with different surface treatments.The field emission model of nanodiamond thin film was established. Field Emission of different Ratio was studyed. The mechanism by which the field emission characteristics of nanocrystalline diamond films are improved was analyzed.

scholarly journals Blade Deterioration in a Gas Turbine Engine

1998 ◽  
Vol 4 (4) ◽  
pp. 233-241 ◽  
Author(s):  
W. Tabakoff ◽  
A. Hamed ◽  
V. Shanov
Keyword(s):  
Stainless Steel ◽  
Gas Turbine ◽  
Protective Coatings ◽  
Aluminide Coating ◽  
Three Dimensional ◽  
Erosive Wear ◽  
Surface Erosion ◽  
Blade Surface ◽  
Erosion Model ◽  
Vapor Deposition Technique

A study has been conducted to predict blade erosion of gas turbine engines. The blade material erosion model is based on three dimensional particle trajectory simulation in the three-dimensional turbine flow field. The trajectories provide the special distribution of the particle impact parameters over the blade surface. A semi-empirical erosion model, derived from erosion tests of material samples at different particulate flow conditions, is used in the prediction of blade surface erosion based on the trajectory impact data. To improve the blade erosion resistance and to decrease the blade deterioration, the blades must be coated. For this purpose, an experimental study was conducted to investigate the behavior of rhodium platinum aluminide coating exposed to erosion by fly ash particles. New protective coatings are developed for erosion and thermal barrier. Chemical vapor deposition technique (CVD) was used to apply the ceramic TiC coatings on INCO 718 and stainless steel 410. The erosive wear of the coated samples was investigated experimentally by exposing them to particle laden flow at velocities from 180 to 305m/s and temperatures from ambient to538°C in a specially designed erosion wind tunnel. Both materials (INCO 718 and stainless steel 410) coated with CVD TiC showed one order of magnitude less erosion rate compared to some commercial coatings on the same substrates.

Synthesis of Diamond Films on Stainless Steel Substrates

1994 ◽  
Vol 11 (3) ◽  
pp. 181-184
Author(s):  
Rujuan Zhan ◽  
Jifong Chen ◽  
Xiaodong Zhu ◽  
Xicheng Jiang ◽  
Xueyi Wang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Diamond Films ◽  
Steel Substrates

DIAMOND GROWN ON STEEL VIA IN-SITU FORMED INTERLAYERS

2002 ◽  
Vol 16 (06n07) ◽  
pp. 881-886 ◽  
Author(s):  
N. G. SHANG ◽  
F. Y. MENG ◽  
C. Y. CHAN ◽  
Q. LI ◽  
C. S. LEE ◽  
...  
Keyword(s):  
Deposition Time ◽  
Diffusion Processes ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Interfacial Layers ◽  
Auger Microscopy ◽  
Hot Filament ◽  
Steel Substrates

Diamond films were grown on steel substrates by a hot filament chemical vapor deposition method without any special substrate pretreatment. When the deposition time was extended from 15 to 83 hrs and above, non-graphitic interfacial layers were formed below diamond films. The interfacial layers were solid and mediated good adherence of diamond films on steel substrates. The interfacial layers were found to be iron and chromium carbides with traces of oxygen as determined by chemical analysis using a scanning Auger microscopy (SAM). The carbide interfacial layers probably resulted from graphitic conversion processes. It is assumed that the graphitic conversion was established on chemical reaction pathways driven by thermal diffusion processes between the earlier formed graphitic layers and atomic constituents of the steel substrates.

Erosive Wear Study of HVOF Spray Cr3C2–NiCr Coated CA6NM Turbine Steel

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Deepak Kumar Goyal ◽  
Harpreet Singh ◽  
Harmesh Kumar ◽  
Varinder Sahni
Keyword(s):  
High Speed ◽  
Protective Coatings ◽  
Average Particle Size ◽  
Erosive Wear ◽  
Average Particle ◽  
Slurry Erosion ◽  
Spray Process ◽  
Hvof Spray ◽  
Turbine Steel ◽  
Ca6nm Steel

Degradation of surfaces of hydroturbine components caused by impact of abrasive particles carried by flowing water is a serious issue. To counteract the same, surface modification of turbine materials by the application of protective coatings is gaining popularity these days. In this work, Cr3C2–NiCr coating was deposited on CA6NM turbine steel by the HVOF spray process and studied with regard to its performance under different slurry erosion conditions. The effect of three parameters, namely average particle size of slurry particles, speed (rpm), and slurry concentration on slurry erosion of this coating material, was studied by using a high speed erosion test rig. The analysis of the surfaces of the samples before and after slurry erosion tests was done by using SEM. The HVOF sprayed Cr3C2–NiCr coating showed very good performance under slurry erosion in comparison with uncoated CA6NM steel.

Scratch adhesion testing of nanophase diamond coatings on steel and carbide substrates

1999 ◽  
Vol 14 (8) ◽  
pp. 3474-3482 ◽  
Author(s):  
F. Davanloo ◽  
C. B. Collins ◽  
K. J. Koivusaari
Keyword(s):  
Data Analysis ◽  
Laser Ablation ◽  
Industrial Applications ◽  
Carbon Ions ◽  
Diamond Coatings ◽  
Interfacial Layers ◽  
Adhesion Testing ◽  
High Energies ◽  
Multiply Charged ◽  
Characterization Studies

Films of nanophase diamond are deposited in vacuum onto almost any substrate by condensing multiply charged carbon ions carrying keV energies. These ions are obtained from the laser ablation of graphite at intensities in excess of 1011 W cm−2. The high energies of condensation produce interfacial layers between the film and substrate materials, resulting in levels of adhesion that can support the protection of substrates subjected to harsh environmental conditions. In this article, we give details of the scratch adhesion testing performed on steel and carbide substrates coated with nanophase diamond. A commercially available scratch tester was used and a data analysis was presented to quantitatively assess and measure the adhesion of films on these important substrates. The characterization studies in this work demonstrated nanophase diamond as a highly adherent coating suitable for industrial applications.

scholarly journals Diamond Films on Stainless Steel Substrates with an Interlayer Applied by Laser Cladding

2017 ◽  
Vol 20 (2) ◽  
pp. 543-548 ◽  
Author(s):  
Andre Contin ◽  
Kenya Aparecida Alves ◽  
Raonei Alves Campos ◽  
Getúlio de Vasconcelos ◽  
Djoille Denner Damm ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Laser Cladding ◽  
Diamond Films ◽  
Steel Substrates
Sign in / Sign up

Export Citation Format

Share Document