scholarly journals Structure and Properties of the Tool Ceramics with Hard Wear Resistant Coatings

2016 ◽  
Vol 61 (3) ◽  
pp. 1265-1270 ◽  
Author(s):  
D. Pakuła ◽  
M. Staszuk ◽  
K. Gołombek ◽  
A. Śliwa ◽  
J. Mikuła
Keyword(s):  
Functional Properties ◽  
High Performance ◽  
Substrate Material ◽  
Properties Of Coatings ◽  
Wear Resistant Coatings ◽  
Cutting Test ◽  
Compressive Stresses ◽  
High Adhesion ◽  
Diffusion Wear ◽  
Tool Ceramics

Abstract This work presents studies of the structure and functional properties of coatings deposited onto indexable inserts made of nitride and sialon tool ceramics with the required properties, i.e. high adhesion, microhardness, high resistance to abrasive and diffusion wear in working conditions of high-performance cuttings tools. In the present paper the results of the investigations of the structure, texture, mechanical and functional properties of the Ti(C,N), (Ti,Al)N, Ti(C,N)+(Ti,Al)N coatings were presented. The 80% increase in the hardness of the coatings in comparison to the substrate material was reported. Test coatings are characterized by good adhesion to the substrate. The maximum Lc load of (Ti,Al)N coat applied to the substrate from the nitride ceramics is equal to 42 N. In the studied coatings compressive stresses were found. The results of mechanical properties investigations, especially tribological ones correlate with the results of exploitation tests carried out during the cutting test.

scholarly journals Research and development of processes of vacuum ion-plasma parts surface treatment

2021 ◽  
Vol 2131 (2) ◽  
pp. 022037
Author(s):  
A Sychev ◽  
I Kolesnikov ◽  
A Voropaev ◽  
I Bolshykh
Keyword(s):  
Surface Treatment ◽  
Lower Layer ◽  
High Hardness ◽  
Middle Layer ◽  
Substrate Material ◽  
Wear Resistant Coatings ◽  
Ion Plasma ◽  
High Adhesion ◽  
Coating Methods ◽  
Combined Coatings

Abstract The application of electron-ion-plasma technologies for increasing the service life of machine parts, tools and technological equipment has been investigated. The technology of vacuum ion-plasma surface treatment is proposed for the deposition of coatings, which makes it possible to create internal, external and combined coatings. The manufacturability of coating methods is largely determined by the level of the developed equipment. The entire technological process of deposition of wear-resistant coatings on parts of friction units is carried out in one cycle on a BRV600F vacuum unit, which is equipped with all the necessary technical means. A method has been developed for the technology of obtaining a superhard carbon-metal coating with desired properties, namely, improving the quality of diamond-like films by changing their structure and composition, while the lower layer should have high adhesion to the substrate material, the middle layer should have high hardness and increased wear resistance, and the upper layer should have good thermal conductivity and heat resistance with low coefficient of friction.

Structure and Properties of the Wear Resistant Coatings Obtained in the PVD and CVD Processes on Tool Ceramics

2006 ◽  
Vol 513 ◽  
pp. 119-134 ◽  
Author(s):  
Leszek Adam Dobrzański ◽  
Daniel Pakuła
Keyword(s):  
Functional Properties ◽  
Scratch Test ◽  
Abrasive Resistance ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Nitride Ceramics ◽  
Pin On Disc ◽  
Grey Cast ◽  
Electron Microscopes ◽  
Tool Ceramics

The paper presents investigation results of structure and functional properties of the hard wear resistant coatings obtained in the PVD and CVD processes on the Si3N4 nitride tool ceramics. Examinations of coatings structures were made using the transmission (TEM) and scanning (SEM) electron microscopes, microhardness tests, coating adhesion to the substrate with the „scratch test”, and the coatings abrasive resistance „pin-on-disc” test. Machining tests results and roughness tests results for the machined grey cast iron surface are also presented. The research carried out proved that depositing the hard, anti wear, multilayer coatings based on the Al2O3 and TiN layers onto the Si3N4 nitride tool ceramics with the PVD method results in obtaining better functional properties like extension of the cutting tool life, than in case of the uncoated nitride ceramics or coated with the PVD coatings and some CVD ones.

scholarly journals Optimization and Process Control for High Performance Thermal Spray Coatings

2000 ◽  
Author(s):  
Christian Moreau ◽  
Luc Leblanc
Keyword(s):  
Process Control ◽  
Thermal Spray ◽  
Plasma Spray ◽  
High Performance ◽  
Thermal Spray Coatings ◽  
Wear Resistant Coatings ◽  
Spray Coatings ◽  
Consistent Manner ◽  
The Stability ◽  
Sprayed Coatings

Abstract Thermal spray coatings are used to protect surfaces against exposure to severe conditions. To insure a reliable protection, not only the structure and properties of the sprayed coatings must be optimized but also one needs to develop appropriate process control techniques to produce high performance coatings in a consistent manner, day after day. This is particularly important during plasma spraying as the wear of the electrodes affects significantly the plasma characteristics and consequently the coating properties. First, in this paper, the stability of plasma spray processes is investigated by monitoring in-flight particle characteristics and plasma fluctuations. Secondly, the possibility and advantages of controlling plasma spray processes by monitoring and regulating the condition of the sprayed particles are discussed. Finally, we will see how the properties of thermal barrier coatings and wear resistant coatings can be optimized by controlling the temperature and velocity of the sprayed particles both in the plasma spray and HVOF (high velocity oxy-fuel) processes.

scholarly journals In-Situ Process and Simulation of High-Performance Piezoelectric-on-Silicon Substrate for SAW Sensor

2021 ◽  
Vol 8 ◽  
Author(s):  
Rui Ma ◽  
Weiguo Liu ◽  
Xueping Sun ◽  
Shun Zhou
Keyword(s):  
Thin Film ◽  
Lithium Niobate ◽  
High Performance ◽  
Electromechanical Coupling ◽  
Substrate Material ◽  
Electromechanical Coupling Coefficient ◽  
Bonding Layer ◽  
Saw Sensor ◽  
Rayleigh Mode

This paper studied the manufacturing process of Piezoelectric-on-Silicon (POS) substrate which integrates 128° Y–X Lithium niobate thin film and silicon wafer using Smart-Cut technology. The blistering and exfoliation processes of the He as-implanted LN crystal under different annealing temperatures are observed by the in-situ method. Unlike the conventional polishing process, the stripping mechanism of the Lithium niobate thin film is changed by controlling annealing temperature, which can improve the surface morphology of the peeling lithium niobate thin film. We prepared the 128° Y–X POS substrate with high single-crystal Lithium niobate thin film and surface roughness of 3.91 nm through Benzocyclobutene bonding. After simulating the surface acoustic wave (SAW) characteristics of the POS substrate, the results demonstrate that the Benzocyclobutene layer not only performs as a bonding layer but also can couple more vibrations into the LN thin film. The electromechanical coupling coefficient of the POS substrate is up to 7.59% in the Rayleigh mode when hLN/λ is 0.3 and hBCB/λ is 0.1. Therefore, as a high-performance substrate material, the POS substrate has proved to be an efficient method to miniaturize and integrate the SAW sensor.

Laser Cladding of Alumina Material Coating: Effects on Deposition Quality

2016 ◽  
Author(s):  
Yuzhou Li ◽  
Weilong Cong ◽  
Fuda Ning ◽  
Rongxia Huang
Keyword(s):  
Laser Cladding ◽  
High Performance ◽  
Ceramic Coating ◽  
High Hardness ◽  
Alumina Ceramic ◽  
Properties Of Coatings ◽  
Surface Protection ◽  
Laser Head ◽  
Coating Methods ◽  
Input Variables

Alumina ceramic is a high performance engineering material with excellent properties, including high melting point, high hardness and brittle nature make the alumina ceramic difficult to machine and needing high cost by using conventional manufacturing methods. Coating is an important method for alumina fabrication. The excellent properties of coatings can be used for special surface protection and ceramic parts repairing. Comparing with other coating methods, laser cladding method has many good properties to overcome the drawbacks. The reported investigations on laser cladding provide little information about alumina materials for ceramic coating. In this paper, effects of different input variables of laser cladding of alumina materials for ceramic coating were studied. And this paper for the first time reported the relationship between the properties (including surface roughness, flatness and powder efficiency) and input variables such as laser power, powder feeding rate and laser head moving rate. The obtained results will be helpful to establish efficient and effective processes for ceramics coating.

A HIGH THROUGHPUT, LOW COST ASSEMBLY APPROACH FOR LED IMS PACKAGES TO HEAT SINK USING ADVANCED THERMAL INTERFACE MATERIALS

2015 ◽  
Vol 2015 (1) ◽  
pp. 000627-000632 ◽  
Author(s):  
Swapan K. Bhattacharya ◽  
Fei Xie ◽  
Han Wu ◽  
Kelley Hodge ◽  
Keck Pathammavong ◽  
...  
Keyword(s):  
Heat Sink ◽  
High Performance ◽  
High Reliability ◽  
Low Cost ◽  
Thermal Interface Material ◽  
Thermal Interface Materials ◽  
Thermal Interface ◽  
Cycle Times ◽  
High Adhesion ◽  
Machine Cycle

The objective of this study is to design and fabricate a high reliability LED Insulated Metal Substrate (IMS) package to complex heat sink attachment using an advanced thermal interface material (TIM). The assembly consists of LED IMS parts bonded to a heat spreader/sink using an advanced TIM and a corner bond material to quickly and accurately secure the LEDs in position. The corner bond adhesive is snap cured for fast machine cycle times while the high performance, high adhesion TIM materials cure throughout the rest of the assembly operation. This approach allows high accuracy LED bonding without the need for alignment pins or fasteners to anchor to the IMS. The IMS attached to the heat sink is then electrically interconnected with a thin flex substrate on top of the IMS. This approach is expected to replace the current mechanical fastners and low strength silicone TIM materials and reduce the cycle time and overall placement cost which are key drivers especially for the automotive industry.

scholarly journals Influence of SiO2 Content and Exposure Periods on the Anticorrosion Behavior of Epoxy Nanocomposite Coatings

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 118 ◽  
Author(s):  
Alam ◽  
Samad ◽  
Sherif ◽  
Poulose ◽  
Mohammed ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Steel Substrate ◽  
Sio2 Nanoparticles ◽  
Epoxy Coating ◽  
Properties Of Coatings ◽  
Ft Ir ◽  
Eis Measurements ◽  
Coating Formulations

Epoxy coating formulations containing 1%, 3%, and 5% SiO2 nanoparticles were produced and applied on a mild steel substrate to achieve the objective of high performance corrosion resistance. The electrochemical impedance spectroscopy (EIS) technique was employed to measure the anticorrosive properties of coatings. The corrosion tests were performed by exposing the coated samples in a solution of 3.5% NaCl for different periods of time, varied from 1 h and up to 30 days. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) analyses revealed the presence of nanoparticles in the final cured samples. Establishing the incorporation of the nanoparticles in the coating formulations was confirmed by employing both of XRD and FT-IR techniques. The FT-IR spectra have proved to be satisfactory indicating that there was a complete reaction between the epoxy resin with the hardener. EIS measurements confirmed that the presence and the increase of SiO2 nanoparticles greatly improved the corrosion resistance of the epoxy coating. The highest corrosion resistance for the coatings was obtained for the formulation with 5% SiO2 nanoparticles content, particularly with prolonging the immersion time to 30 days.

X-Ray Diffraction Determination of Macro and Micro Stresses in SOFC Electrolyte and Evolution with Redox Cycling of the Anode

2011 ◽  
Vol 681 ◽  
pp. 25-30 ◽  
Author(s):  
Julie Villanova ◽  
Olivier Sicardy ◽  
Roland Fortunier ◽  
Jean Sebastien Micha ◽  
Pierre Bleuet
Keyword(s):  
High Performance ◽  
Life Time ◽  
Redox Cycling ◽  
European Synchrotron Radiation Facility ◽  
X Ray Diffraction ◽  
Compressive Stresses ◽  
Diffraction Determination ◽  
Local Measurements ◽  
Strain Stress

Solid Oxide Fuel Cell (SOFC) is a high-performance electrochemical device for energy conversion. Usually, the electrolyte is made of dense YSZ (Yttria Stabilized Zirconia) and the anode is a porous YSZ-Ni composite. The electrolyte is submitted to high stresses mainly due to the thermal expansion coefficient mismatch between components and the volume change associated with the redox cycling of Ni. Because the mechanical integrity of the cell is a major issue during its life time, it is proposed in this study to determine both micro and macro stresses in the electrolyte. Macro stresses in the 10 µm-thick electrolyte were measured using the sin²(Ψ) method after different treatments of the cell : (i) manufacturing, (ii) thermal cycle, (iii) reduction and (iv) re-oxidation of the anode layer. After manufacturing, the electrolyte is under strong biaxial compressive stresses (-690 MPa). These stresses decrease after reduction of the anode. They finally reach tensile stresses and induce the cracking of the electrolyte for full re-oxidation. Micro stresses determinations were performed using the micro-diffraction setup of the BM32 beam line at ESRF (European Synchrotron Radiation Facility). Complete strain-stress tensor and crystallographic orientation determinations have been achieved within 5 µm grains. The accuracy of the method has been improved and is now 2.4 10-4 for strain values. On an average, local measurements are found to be consistent with global ones. Both strain and stress heterogeneities between grains with various orientations have been evidenced.

Cutting Properties of PVD and CVD Coated A2lO 3 + TiC Tool Ceramic

2007 ◽  
Vol 539-543 ◽  
pp. 1159-1164
Author(s):  
Mirko Sokovic ◽  
Leszek Adam Dobrzański ◽  
Janez Kopač ◽  
Ladislav Kosec
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Micro Hardness ◽  
Wear Resistant Coatings ◽  
Hardness Tester ◽  
Hardness Tests ◽  
Cutting Inserts ◽  
Grey Cast ◽  
Tool Ceramics ◽  
Substrate Hardness

The paper presents investigation results of tribological and cutting properties of the coatings deposited with the PVD and CVD techniques on cutting inserts made from the Al2O3 + TiC tool ceramics. Tests were carried out on the inserts made from ceramics, uncoated and PVD or CVD-coated with gradient, mono-, multilayer and multicomponent hard wear resistant coatings composed of TiN, TiCN, TiAlN, TiAlSiN and Al2O3 layers. Substrate hardness tests and micro hardness tests of the deposited coatings were made on the ultra-micro-hardness tester. It was demonstrated, basing on the technological cutting tests of grey cast iron (260 HB), that putting down onto the tool ceramics the thin anti-wear PVD and CVD coatings increases their abrasion wear resistance, which has a direct effect on extending tool life of the cutting edge.

scholarly journals Improved epoxy thermosets by the use of poly(ethyleneimine) derivatives

2017 ◽  
Vol 2 (8) ◽  
Author(s):  
Cristina Acebo ◽  
Xavier Ramis ◽  
Angels Serra
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resins ◽  
High Performance ◽  
Polymer Network ◽  
General Purpose ◽  
High Adhesion ◽  
Hyperbranched Poly ◽  
Fiber Reinforced Materials ◽  
Wide Range ◽  
Good Heat

Abstract Epoxy resins are commonly used as thermosetting materials due to their excellent mechanical properties, high adhesion to many substrates and good heat and chemical resistances. This type of thermosets is intensively used in a wide range of fields, where they act as fiber-reinforced materials, general-purpose adhesives, high-performance coatings and encapsulating materials. These materials are formed by the chemical reaction of multifunctional epoxy monomers forming a polymer network produced through an irreversible way. In this article the improvement of the characteristics of epoxy thermosets using different hyperbranched poly(ethyleneimine) (PEI) derivatives will be explained.

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