High-Temperature Sliding Wear Testing of Cathodic Arc Physical Vapor Deposition AlTiN- and AlTiON-Coated Hot Work Tool Steels

2010 ◽  
Vol 42 (11) ◽  
pp. 3316-3322 ◽  
Author(s):  
Yucel Birol ◽  
Duygu İsler ◽  
Mustafa Urgen
Keyword(s):  
High Temperature ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Sliding Wear ◽  
Wear Testing ◽  
Tool Steels ◽  
Sliding Wear Testing ◽  
Cathodic Arc ◽  
Hot Work Tool Steels

EFFECT OF COATING THICKNESS ON THE PROPERTIES OF TiN COATINGS DEPOSITED ON TOOL STEELS USING CATHODIC ARC PVD TECHNIQUE

2008 ◽  
Vol 15 (04) ◽  
pp. 401-410 ◽  
Author(s):  
A. MUBARAK ◽  
PARVEZ AKHTER ◽  
ESAH HAMZAH ◽  
MOHD RADZI HJ. MOHD TOFF ◽  
ISHTIAQ A. QAZI
Keyword(s):  
Surface Morphology ◽  
Tool Steel ◽  
Coating Thickness ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Testing Machine ◽  
High Speed Steel ◽  
Hard Coatings ◽  
Tool Steels ◽  
Cathodic Arc

Titanium nitride ( TiN ) widely used as hard coating material, was coated on tool steels, namely on high-speed steel (HSS) and D2 tool steel by physical vapor deposition method. The study concentrated on cathodic arc physical vapor deposition (CAPVD), a technique used for the deposition of hard coatings for tooling applications, and which has many advantages. The main drawback of this technique, however, is the formation of macrodroplets (MDs) during deposition, resulting in films with rougher morphology. Various standard characterization techniques and equipment, such as electron microscopy, atomic force microscopy, hardness testing machine, scratch tester, and pin-on-disc machine, were used to analyze and quantify the following properties and parameters: surface morphology, thickness, hardness, adhesion, and coefficient of friction (COF) of the deposited coatings. Surface morphology revealed that the MDs produced during the etching stage, protruded through the TiN film, resulting in film with deteriorated surface features. Both coating thickness and indentation loads influenced the hardness of the deposited coatings. The coatings deposited on HSS exhibit better adhesion compared to those on D2 tool steel. Standard deviation indicates that the coating deposited with thickness around 6.7 μm showed the most stable trend of COF versus sliding distance.

Strain Tolerance and Microstructure of Thermal Barrier Coatings Produced by Electron Beam Physical Vapor Deposition Process

2006 ◽  
Vol 522-523 ◽  
pp. 267-276 ◽  
Author(s):  
Kunihiko Wada ◽  
Yutaka Ishiwata ◽  
Norio Yamaguchi ◽  
Hideaki Matsubara
Keyword(s):  
Electron Beam ◽  
High Temperature ◽  
Thermal Barrier Coatings ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Aging Treatment ◽  
Nanoindentation Test ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Strain Tolerance

Several kinds of thermal barrier coatings (TBCs) deposited by electron beam physical vapor deposition (EB-PVD) were produced as a function of electron beam power in order to evaluate their strain tolerance. The deposition temperatures were changed from 1210 K to 1303 K depending on EB power. In order to evaluate strain tolerances of the EB-PVD/TBCs, a uniaxial compressive spallation test was newly proposed in this study. In addition, the microstructures of the layers were observed with SEM and Young’s moduli were measured by a nanoindentation test. The strain tolerance in as-deposited samples decreased with an increase in deposition temperature. In the sample deposited at 1210 and 1268 K, high-temperature aging treatment at 1273 K for 10 h remarkably promoted the reduction of the strain tolerance. The growth of thermally grown oxide (TGO) layer generated at the interface between topcoat and bondcoat layers was the principal reason for this strain tolerance reduction. We observed TGO-layer growth even in the as-deposited sample. Although the thickness of the initial TGO layer in the sample deposited at high temperature was thicker, the growth rate during aging treatment was smaller than those of the other specimens. This result suggests that we can improve the oxidation resistance of TBC systems by controlling the processing parameters in the EB-PVD process.

Four-inch high quality crack-free AlN layer grown on a high-temperature annealed AlN template by MOCVD

2021 ◽  
Vol 42 (12) ◽  
pp. 122804
Author(s):  
Shangfeng Liu ◽  
Ye Yuan ◽  
Shanshan Sheng ◽  
Tao Wang ◽  
Jin Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Flat Surface ◽  
Epitaxial Lateral Overgrowth ◽  
High Temperature Annealing ◽  
High Quality ◽  
High Crystalline Quality ◽  
X Ray ◽  
Lateral Overgrowth

Abstract In this work, based on physical vapor deposition and high-temperature annealing (HTA), the 4-inch crack-free high-quality AlN template is initialized. Benefiting from the crystal recrystallization during the HTA process, the FWHMs of X-ray rocking curves for (002) and (102) planes are encouragingly decreased to 62 and 282 arcsec, respectively. On such an AlN template, an ultra-thin AlN with a thickness of ~700 nm grown by MOCVD shows good quality, thus avoiding the epitaxial lateral overgrowth (ELOG) process in which 3–4 μm AlN is essential to obtain the flat surface and high crystalline quality. The 4-inch scaled wafer provides an avenue to match UVC-LED with the fabrication process of traditional GaN-based blue LED, therefore significantly improving yields and decreasing cost.

Biomineralization of Titanium Alloy with Surface Micro - and Nanoscaled Modifications

2019 ◽  
Vol 813 ◽  
pp. 165-170
Author(s):  
Maria P. Nikolova ◽  
Stefan Valkov ◽  
Stoyan Parshorov ◽  
Emil Yankov ◽  
Peter Petrov
Keyword(s):  
Electron Beam ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Corrosion Current ◽  
Electrochemical Stability ◽  
Immersion Period ◽  
Initial Decrease ◽  
Static Conditions ◽  
Cathodic Arc ◽  
Deposition Techniques

The aim of the present study was to characterize two kinds of TiN/TiO2 coatings in terms of topography, composition, and electrochemical stability after immersion in simulated body fluid (SBF). Micropatterning of the substrate (Ti-5Al-4V alloy) was done by using electron beam modification (EBM) by scanning electron beam while nanostructured TiN/TiO2 films were deposited over EBM Ti5Al4V substrates using two physical vapor deposition techniques: 1) magnetron sputtering, and 2) cathodic arc and glow-discharge methods. When immersed for 7 and 14 days in SBF at static conditions (37±0.05 °C, pH 7.4), Ca/P ratio of the apatite deposits increased from approximately 1.5 up to near stoichiometric (1.67), respectively. After the initial decrease, the pH of the solution during soaking increased gradually reaching values close to 7.7 for both coatings. However, the weight gain of the samples with Arc coatings after the immersion period in SBF was nearly three times more than those with magnetron deposited coating. The electrochemical potentiodynamic tests performed in SBF indicated a shift in the corrosion potentials towards nobler direction after 7 and 14 days of immersion compared to non-immersed samples, whereas the corrosion current density was slightly increased.

Microstructure of Fe-Based ODS High-Temperature Alloy Sheet Prepared by EBPVD

2007 ◽  
Vol 353-358 ◽  
pp. 1637-1640 ◽  
Author(s):  
Xiu Lin ◽  
Yue Sun ◽  
Guang Pin Song ◽  
Xiao Dong He
Keyword(s):  
High Temperature ◽  
Substrate Temperature ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Orientation Angle ◽  
Alloy Sheet ◽  
Columnar Microstructure ◽  
High Temperature Alloy ◽  
Vapor Deposition Technique ◽  
Physical Vapor Deposition Technique

Large-sized Fe-based ODS (Oxide Dispersive Strengthen) high-temperature alloy sheets were successfully synthesized by EBPVD (Electron Beam Physical Vapor Deposition) technique. The sheets were about 120μm thick, and having a diameter of 1000mm, whose surface roughness was less than 1μm (Ra<1μm). The microstructures were examined by SEM (Scanning Electron Microscope). The grain size was 1-4μm. When the substrate temperature was 600°C, the sheet had sharp irregular polyhedral grain, and when the substrate temperature was 700°C the sheet had quite regular grains. The morphological orientation angle increased with the distance from the center of the sheet. During the first period of deposition, the sheet was growing in a G-L-S mode, which corresponded with the corn-like microstructure in the cross-section. While during the final period, the sheet changed into a G-S growing mode, which corresponded to the smooth columnar microstructure.

Study of Interlayer Element Effect on Properties of AlCrTiSiN Thin Film

2014 ◽  
Vol 893 ◽  
pp. 543-549 ◽  
Author(s):  
Tharanon Usana-Ampaipong ◽  
Sirawut Prapasuk ◽  
Kawiphong Feung-Im ◽  
Karuna Tuchinda ◽  
Kessaraporn Wathanyu ◽  
...  
Keyword(s):  
High Temperature ◽  
Physical Vapor Deposition ◽  
Room Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Wear Behavior ◽  
Cutting Tools ◽  
Surface Hardness ◽  
Scratch Resistance ◽  
Tribological Performance ◽  
Cathodic Arc

In this work, the effect of different interlayer elements on the properties of the top AlCrTiSiN film, i.e. titanium and chromium called as Ti/AlCrTiSiN and Cr/AlCrTiSiN, respectively, was studied. The film was deposited by cathodic arc physical vapor deposition on tungsten carbide (WC) specimen which is extensively used as cutting tools material. Various properties including the surface hardness, the scratch resistance and tribological performance were later studied. The surface hardness of both Ti/AlCrTiSiN and Cr/AlCrTiSiN coatings were higher than 29 GPa. The critical load for both coating suggesting supurb adhesion strength of the coating system. However, Ti interlayer was found to result in higher critical compressive stress for first damage and full delamination at room temperature. The wear resistance of coated specimens was far better than the uncoated one both at room temperature and high temperature, i.e. ball on disc tests at room temperature, 300 °C, and 500 °C were performed. The coeeficient of friciton of both coatings were found to depend strongly on the wear behavior of the system and the characters of the wear debris. A sign of better tribological performance at high temperature, i.e. 500°C, could be noticed with Cr interlayer as the lower mismatch in coefficient of thermal expansion became more crucial in film damage phenomina at such temperature.

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