Tribological Properties of Superhard PVD Coatings

1991 ◽  
Vol 239 ◽  
Author(s):  
O. Knotek ◽  
F. Löffler
Keyword(s):  
Tribological Properties ◽  
Hexagonal Lattice ◽  
Wear Test ◽  
Amorphous Structure ◽  
Hard Coatings ◽  
X Ray Diffraction ◽  
Ion Plating ◽  
Cathode Substrate ◽  
Pin On Disc ◽  
Reactive Gases

AbstractIn order to advance the development of extremely hard coatings, new homogeneous and metastable films were prepared by magnetron sputter ion plating (MSIP) and arc ion plating (AIP) in the DC. or RF. mode.In the present study coatings in the systems Ti-B-C-N, Si-C-N and amorphous carbon coatings (ADLC) were investigated and compared with other hard coatings. Multicomponent layers of different compositions and structures were deposited by varying the reactive gases methane (CH4) and nitrogen (N2) and the dominant process parameters (e. g. C/V-characteristic of the cathode, substrate bias).X-ray diffraction studies of the Ti-B-C-N coatings revealed either an amorphous structure or crystallization in a hexagonal lattice. The ADLC and Si-C-N coatings were always amorphous. Electron microprobe analysis and auger electron spectroscopy were used to determine the coating compositions.The tribological properties were determined by a ball on disc tribometer (e.g. friction coefficent), a pin on disc tribometer and a special abrasive wear test.

Improving the Tribological Properties of Mg Based AZ31 Alloy Using Friction Stir Processing

2012 ◽  
Vol 585 ◽  
pp. 579-583 ◽  
Author(s):  
H.S. Arora ◽  
Harpreet Singh ◽  
B.K. Dhindaw ◽  
Harpreet S. Grewal
Keyword(s):  
Tribological Properties ◽  
Friction Stir Processing ◽  
Volume Fraction ◽  
Wear Test ◽  
Az31 Alloy ◽  
Second Phase ◽  
Matrix Composites ◽  
Friction Stir ◽  
Pin On Disc ◽  
Modification Technique

Materials with improved tribological properties have become the pre-requisite of advanced engineering design. Surface metal matrix composites (SMMCs) exhibit a unified combination of good tribological properties and high toughness of the interior bulk metal when compared with monolithic materials. Friction stir processing, a microstructure modification technique, has emerged as one of the processes used for fabrication of SMMCs. Commercial cast or wrought type Mg–Al–Zn AZ-series alloys, such as AZ91, AZ61 or AZ31 with 3–9 wt.% Al and 1 wt.% Zn, have been widely used in automobiles or electronic appliances. Due to low percentage of alloying elements/second phase elements in these alloys, the grain refinement and hence the mechanical properties such as hardness cannot be appreciably enhanced. In this study, FSP was used to fabricate AZ31 based nanocomposite using TiC as reinforcement. FSP was performed at a fixed volume fraction of TiC under varying cooling conditions. Tribological performance of the fabricated composite was investigated using pin-on-disc wear test arrangement. The analysis of the wear surfaces as well as wear debris analysis was done using SEM equipped with EDS. The fabricated composite was found to exhibit superior wear resistance.

Tribological Properties of Plasma-Sprayed 20 wt. % ZrO2-Al2O3-17 wt.% TiO2 Coatings on Plain Carbon Steel Substrate

2012 ◽  
Vol 463-464 ◽  
pp. 420-424
Author(s):  
San Ming Du ◽  
Yong Ping Niu ◽  
Yong Zhen Zhang
Keyword(s):  
Carbon Steel ◽  
Tribological Properties ◽  
Steel Substrate ◽  
Plain Carbon Steel ◽  
X Ray Diffraction ◽  
Properties Of Coatings ◽  
Bond Layer ◽  
Spray Technique ◽  
Pin On Disc ◽  
Plasma Sprayed

In the present study, 20 Wt. % ZrO2-Al2O3-17 wt.% TiO2 powders were sprayed using a plasma-spray technique after a NiAl bond layer was deposited on plain carbon steel substrate. The produced coatings were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) including energy-dispersive spectroscopy (EDS). The tribological properties of coatings against hard alloy ball were investigated by using a pin-on-disc tribo-meter under dry environments. The predominant wear mechanism of coating is fatigue.

scholarly journals Structure and Properties of Zr-Mo-Si-B-(N) Hard Coatings Obtained by d.c. Magnetron Sputtering of ZrB2-MoSi2 Target

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1932
Author(s):  
Philipp Kiryukhantsev-Korneev ◽  
Alina Sytchenko ◽  
Yuriy Pogozhev ◽  
Stepan Vorotilo ◽  
Anton Orekhov ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Oxidation Resistance ◽  
Elastic Recovery ◽  
Optical Emission ◽  
Hard Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Pin On Disc ◽  
High Oxidation Resistance

Coatings in a Zr-Mo-Si-B-N system were deposited by the magnetron sputtering of ZrB2-MoSi2 targets in argon and nitrogen. The structure of the coatings was investigated using scanning electron microscopy, X-ray diffraction, energy-dispersive spectroscopy, and glow-discharge optical emission spectroscopy. Mechanical and tribological properties were measured using nanoindentation and pin-on-disc testing. Oxidation resistance and oxidation kinetics were estimated via annealing in air at 1000–1500 °C and precision weight measurements. We found that the coatings deposited in Ar demonstrate a superior combination of properties, including hardness of 36 GPa, elastic recovery of 84%, a friction coefficient of 0.6, and oxidation resistance at temperatures up to 1200 °C. High oxidation resistance is realized due to the formation of the protective (SiO2 + ZrO2)/SiO2 oxide layer, which inhibits the diffusion of oxygen into the coating.

scholarly journals Comparative Analysis on the Structure and Properties of Iron-Based Amorphous Coating Sprayed with the Thermal Spraying Techniques

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1006
Author(s):  
Amjad Iqbal ◽  
Sumera Siddique ◽  
Moazam Maqsood ◽  
Muhammad Atiq Ur Rehman ◽  
Muhammad Yasir
Keyword(s):  
Comparative Analysis ◽  
Electrochemical Impedance ◽  
Thermal Spraying ◽  
Wear Test ◽  
Atmospheric Plasma ◽  
Amorphous Coating ◽  
X Ray Diffraction ◽  
Detailed Structural Analysis ◽  
Pin On Disc ◽  
Iron Based

Iron-based amorphous coatings are getting attention owing to their attractive mechanical, chemical, and thermal properties. In this study, the comparative analysis between high-velocity oxy-fuel (HVOF) and atmospheric plasma (APS) spraying processes has been done. The detailed structural analysis of deposited coatings were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Mechanical and electrochemical properties were investigated by using micro-Vickers hardness testing, pin-on-disc tribometry and potentiodynamic analysis. The microstructure comparison revealed that HVOF-coated samples had better density than that of APS. The porosity in APS-coated samples was 2 times higher than that of HVOF-coated samples. The comparison of tribological properties showed that HVOF-coated samples had 3.9% better hardness than that of coatings obtained via APS. The wear test showed that HVOF-coated samples had better wear resistance in comparison to APS coatings. Furthermore, the potentiodynamic polarization and electrochemical impedance spectroscopy showed that the HVOF-coated samples had better corrosion resistance in comparison to APS-coated samples.

Fabrication of ZnO Nanodot Arrays by Sol-Gel within AAO Template

2010 ◽  
Vol 150-151 ◽  
pp. 921-925 ◽  
Author(s):  
Bo Gao ◽  
Hai Ming Zhang ◽  
Xiao Jie Li ◽  
Guo Feng Hu ◽  
Yu Jie Li ◽  
...  
Keyword(s):  
Composite Structure ◽  
Sol Gel ◽  
Hexagonal Lattice ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Aao Template ◽  
Ultraviolet Emission ◽  
Nanodot Arrays ◽  
Strong Ultraviolet Emission ◽  
Xrd Patterns

ZnO nanodot arrays were fabricated by using AAO template combining with sol-gel method. Structure and optical properties of ZnO/AAO composite structure were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and photoluminescence (PL). The SEM results indicated that the pores in the template were arranged in a regular hexagonal lattice and ZnO nanodots were assembled into the AAO template. The XRD patterns demonstrated that the AAO template had an amorphous structure, and the ZnO nanodots had wurtzite structures. The PL spectrum revealed that ZnO/AAO composite structure had a strong ultraviolet emission at 390 nm.

scholarly journals Tribological Properties on P91 Alloy Steel Treated with Normalizing & Carburizing Process

2019 ◽  
Vol 9 (1) ◽  
pp. 2078-2082 ◽  
Keyword(s):  
Heat Treatment ◽  
Wear Test ◽  
High Hardness ◽  
Hardness Test ◽  
Variable Load ◽  
X Ray Diffraction ◽  
P91 Steel ◽  
Treatment Processes ◽  
Pin On Disc ◽  
Alloy Steels

An Experimental analysis was undertaken to analyze the changes in the Mechanical Properties and Microstructure of P91 steel, subjected to Normalizing and Carburizing heat treatment Processes keeping in mind the potential capabilities of P91 steel as the base metal due to its wide applications in Boilers manufacturing. P91 is a type of alloy steels having high hardness and wear resistance suface. The heat treatment processes were carried out in the present experimental procedure at constant temperature and for different timings like 60 minutes, 90 minutes and 120 minutes. Hardness of the specimen was tested by using Rockwell Hardness test. A pin on disc machine was used to conduct the wear test. Wear test was carried out on treated P91 steel on various parameters like variable load and constant speed. The Microstructural results are concluded with SEM (Scanning Electron Microscope) and XRD (X-Ray diffraction) techniques

Investigation of Microstructural and Mechanical Properties of Al 5083-ZrSiO4-Gr Hybrid Composite

2018 ◽  
Vol 17 (04) ◽  
pp. 1760029
Author(s):  
T. Hariprasad ◽  
K. Varatharajan ◽  
S. Ravi
Keyword(s):  
Mechanical Properties ◽  
Hybrid Composite ◽  
Normal Load ◽  
Wear Test ◽  
Stir Casting ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Casting Technique ◽  
Mechanical And Tribological Properties ◽  
Pin On Disc

In this present work, an attempt is made to compare the microstructural, mechanical and tribological properties of Al 5083-5% and 10% Gr, Al 5083-5% and 10% ZrSiO4 composite with Al 5083-5, 10% Gr-5 and 10% ZrSiO4 hybrid composite. The samples were prepared by using the stir casting technique, and the characterizations of composites and hybrid composite were observed by using SEM, EDAX and X-ray diffraction (XRD). The mechanical properties such as hardness, tensile, compressive strength of hybrid composite were found to be better than those of composites. The wear test was carried out by using a pin-on-disc wear tribometer by varying parameters like normal load (5, 10[Formula: see text]N), sliding speed (1, 1.5, 2[Formula: see text]m/s) with constant sliding distance (2000[Formula: see text]m). The worn surface of the samples is examined by using SEM, and the wear properties of the hybrid composite are found to exhibit superior wear resistance properties than composites.

Tribological properties of r.f. sputtered Ti-B-N coatings under various pin-on-disc wear test conditions

1993 ◽  
Vol 58 (1) ◽  
pp. 29-35 ◽  
Author(s):  
E. Broszeit ◽  
B. Matthes ◽  
W. Herr ◽  
K.H. Kloos
Keyword(s):  
Tribological Properties ◽  
Wear Test ◽  
Test Conditions ◽  
Pin On Disc

Structural Examination of Multilayer CrAlSiN/AlSiN Coatings Deposited by Cathodic Arc

2017 ◽  
Vol 48 ◽  
pp. 62-70 ◽  
Author(s):  
Dimitrios Chaliampalias ◽  
Nikolaos Pliatsikas ◽  
Eleni Pavlidou ◽  
Lilyana Kolaklieva ◽  
Roumen Kakanakov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Surface Layer ◽  
Amorphous Structure ◽  
Hard Coatings ◽  
X Ray Diffraction ◽  
Structural Examination ◽  
X Ray ◽  
Extra Sequence ◽  
Cathodic Arc

In this research, the possibility of applying multilayer multielement super hard coatings by Cathodic Arc is investigated. More precisely the structure of the coating consisting of quaternary CrAlSiN and ternary AlSiN layers is examined by electron microscopy, X-ray diffraction and X-ray photoelectron microscopy analytical methods. The as-deposited samples were found to have distinguishable layers. The CrAlSiN layer is characterized by an extra sequence of repeated nanolayers. The AlSiN layer consisted of nanosized grains having a preferential orientation. Finally the surface layer was found to contain a solid solution of CrxAl1-xN, while Si3N4was identified only by XPS most probably due to its amorphous structure.

Electron Microscope study of commensurate-incommensurate phase transition in BaZnGeO4

1990 ◽  
Vol 48 (4) ◽  
pp. 172-173
Author(s):  
Naoki Yamamoto ◽  
Makoto Kikuchi ◽  
Tooru Atake ◽  
Akihiro Hamano ◽  
Yasutoshi Saito
Keyword(s):  
Phase Transition ◽  
Electron Microscope Study ◽  
Room Temperature ◽  
Hexagonal Lattice ◽  
Ferroelectric Materials ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Periodic Arrays ◽  
Modulation Wave Vector

BaZnGeO4 undergoes many phase transitions from I to V phase. The highest temperature phase I has a BaAl2O4 type structure with a hexagonal lattice. Recent X-ray diffraction study showed that the incommensurate (IC) lattice modulation appears along the c axis in the III and IV phases with a period of about 4c, and a commensurate (C) phase with a modulated period of 4c exists between the III and IV phases in the narrow temperature region (—58°C to —47°C on cooling), called the III' phase. The modulations in the IC phases are considered displacive type, but the detailed structures have not been studied. It is also not clear whether the modulation changes into periodic arrays of discommensurations (DC’s) near the III-III' and IV-V phase transition temperature as found in the ferroelectric materials such as Rb2ZnCl4.At room temperature (III phase) satellite reflections were seen around the fundamental reflections in a diffraction pattern (Fig.1) and they aligned along a certain direction deviated from the c* direction, which indicates that the modulation wave vector q tilts from the c* axis. The tilt angle is about 2 degree at room temperature and depends on temperature.

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