The Influence of the Diffusion on Adherence of the 60T Deposits Obtained by Thermal Spraying in Electric Arc

2013 ◽  
Vol 371 ◽  
pp. 270-274 ◽  
Author(s):  
Stefan Lucian Toma ◽  
Diana Antonia Gheorghiu ◽  
Steluta Radu ◽  
Costică Bejinariu
Keyword(s):  
Thermal Treatment ◽  
Thermal Processing ◽  
Thermal Spraying ◽  
Xrd Analysis ◽  
Electric Arc ◽  
Processing Method ◽  
Thermal Treatments ◽  
Technological Parameters ◽  
Spraying Process

The physic-chemical and mechanical properties of steel deposits obtained by thermal spraying depend on technological parameters of the spraying process. Generally, wear resistance of the deposits depends on the degree of porosity and the adhesion of the layer to the substrate. In the case of the deposits obtained by spraying, studies have shown that between deposited layer (SD) and substrate (S) there are the following types of adhesions: mechanical, metallurgical, superficial, physical and diffusive. Each type of adherence, enumerated above, works through a well-defined mechanism so that it can be said that the adhesion of the obtained deposits by thermal spray is a sum of mechanisms which interacting. How these mechanisms interact, as well the percentage of the influence is determined by: operating parameters, by the deposit material and thermal treatments after the deposit obtaining. This paper proposes to determine the influence of thermal treatment on adherence of 60T deposits obtained by thermal spraying in electric arc- as a thermal processing method after metallization. The assessment of adherence deposit 60T - in two ways, according to with EN 582 and DIN 27201/2005 in conjunction with the investigations of electron microscopy (SEM), XRD analysis, and image analysis performed at both the zone: Coating - Interface - Substrate (CIS) has revealed the presence of diffusion and the structural constituents. The graphs of adherence variation for 60T deposits with the concentration gradient of the alloying elements of the 60T layer respectively of adherence layer (75B) obtained experimentally by investigations carried out on the substrate have demonstrated the role of the secondary thermal treatment on the deposit adherence.

The Improvement of the Physical and Mechanical Properties of Steel Deposits Obtained by Thermal Spraying in Electric Arc

2013 ◽  
Vol 814 ◽  
pp. 173-179 ◽  
Author(s):  
Stefan Lucian Toma ◽  
Costică Bejinariu ◽  
Diana Antonia Gheorghiu ◽  
Constantin Baciu
Keyword(s):  
Mechanical Properties ◽  
Thermal Field ◽  
Thermal Spraying ◽  
Physical And Mechanical Properties ◽  
Electric Arc ◽  
New Device ◽  
Advantages And Disadvantages ◽  
Physical Chemical ◽  
Adherence Assessment ◽  
Spraying Process

Steel depositsobtained by thermal spray arc have physical-chemical and mechanical properties dependent on operational parameters of the spraying process. Thus, the electric current intensity, the spray distance, the velocity, respectively the driving gas pressure are the parameters that influence the mechanical properties of the steel deposits obtained by thermal spraying. The interaction between particles- gas drive seen in the classic arc spray has the effect the lowering of particles temperature and implicitly of the physical and mechanical properties of the deposit. Using a new device, combined, in which over the thermal field, created by the electric arc, would overlap a second thermal field, created by a gaseous fuel burning, would determine the maintaining of high temperature of the particles and implicitly changes of the physical, chemical and mechanical properties of the deposit. Such a combined spraying device would be called device for spraying in electric arc-thermally activated. The paper aims to present a comparative study of the physic chemical and mechanical properties of steel deposits obtained with two spraying processes: the classical process and the combined spraying process - in electric arc thermally activated.Investigations carried out on the structure of deposits by electron microscopy SEM, XRD analysis and image analysis performed at zone level Layer-Substrate as well the deposits adherence assessment in accordance with EN 582-allows the highlighting properties, the arguing of differences between the properties of the deposits made by the two methods as well as the establishing advantages and disadvantages using those processes.

scholarly journals Increasing The Efficiency Of Thermal Processing Under The Influence Of Magnetic Fields

2020 ◽  
Vol 02 (11) ◽  
pp. 428-434
Author(s):  
Umidjon Kasimov ◽  
◽  
Zulfiyaxon Mamataliyeva ◽  
Keyword(s):  
Thermal Treatment ◽  
Magnetic Fields ◽  
Impact Toughness ◽  
Thermal Processing ◽  
Impact Resistance ◽  
Vertical Direction ◽  
Technological Parameters ◽  
The Impact

In this article it is proposed to increase the impact resistance of alloyed stamped steels during magneto thermal treatment without changing the hardness. Determination of the optimal technological parameters for magneto thermal treatment of steels 5ХНМ, ЗХЗМЗФ, 4Х5МФС, 4Х5В2ФС. It is recommended to increase the impact toughness when processing steel 4X5В2ФС with a cyclic magnet in the vertical direction of the samples during magneto thermal treatment.

scholarly journals Role of Ambient Pressure on Splat Formation and Coating Adhesion Strength during Thermal Spraying Process

2011 ◽  
Vol 29 (3) ◽  
pp. 151s-155s ◽  
Author(s):  
Kun YANG ◽  
Kazuhiro TANAKA ◽  
Takashi USAMI ◽  
Masahiro FUKUMOTO ◽  
Toshiaki YASUI ◽  
...  
Keyword(s):  
Adhesion Strength ◽  
Ambient Pressure ◽  
Thermal Spraying ◽  
Splat Formation ◽  
Coating Adhesion ◽  
Spraying Process

Scaling of correlation length in lamellae forming PS-b-PMMA thin films upon high temperature rapid thermal treatments

2015 ◽  
Vol 3 (33) ◽  
pp. 8618-8624 ◽  
Author(s):  
M. Ceresoli ◽  
F. G. Volpe ◽  
G. Seguini ◽  
D. Antonioli ◽  
V. Gianotti ◽  
...  
Keyword(s):  
Thin Films ◽  
High Temperature ◽  
Thermal Treatment ◽  
Correlation Length ◽  
Thermal Processing ◽  
Rapid Thermal Processing ◽  
Processing Parameters ◽  
Thermal Treatments ◽  
Processing Machine

Highly ordered lamellar grains were produced by thermal treatment of the samples in a rapid thermal processing machine. The processing parameters that maximize the lateral order avoiding any degradation of the macromolecules were identified.

Influence of the Spraying Distance and Jet Temperature on the Porosity and Adhesion of the Ti Depositions, Obtained by Thermal Spraying in Electric Arc - Thermal Activated

2014 ◽  
Vol 657 ◽  
pp. 296-300 ◽  
Author(s):  
Stefan Lucian Toma ◽  
Magda Badescu ◽  
Iulian Ionita ◽  
Manuela Ciocoiu ◽  
Lucian Eva
Keyword(s):  
Thermal Spraying ◽  
Electric Arc ◽  
X Ray Diffraction ◽  
Spray Distance ◽  
Finite Elements Analysis ◽  
X Ray ◽  
Thermally Activated ◽  
High Adhesion ◽  
Spraying Process

This paper presents an experimental study carried out on the properties of Ti depositions, obtained through thermal spraying in electric arc - thermally activated. The spraying process is a combination between the classical process of thermal spraying and the spraying process in flame. Finite elements analysis of the thermal spraying process in electric arc, allowed the estimated determination of the temperature variations of the jet drive, of the amount of gaseous fuel and also of the optimum spraying distance. The investigations, carried out through the performing electron microscopy analyses (SEM), X-ray diffraction, by determining the porosity and the adhesion of the Ti deposition, allowed the highlight fact that through an optimum choosing of the entrainment jet temperature, are producing dense Ti deposits, characterized by high adhesion (16%). In addition, the deposit porosity -required for integration of the biocompatible materials, can be controlled by the optimal choosing of the spray distance.

Comparison of Mineralogical Changes during Thermal Processing of Limestones

2017 ◽  
Vol 908 ◽  
pp. 56-60
Author(s):  
Dušan Dolák ◽  
Karel Dvořák ◽  
Jaroslav Bureš ◽  
Dominik Gazdič
Keyword(s):  
Thermal Treatment ◽  
Phase Transformations ◽  
Real Time ◽  
Thermal Processing ◽  
Industrial Process ◽  
Mineralogical Composition ◽  
Xrd Analysis ◽  
Laboratory Furnace ◽  
Different Temperatures

Thermal treatment of materials involves phase transformations. In the case of conventional laboratory furnace or in an industrial process, the samples are analysed after cooling. In this way, these phases can be monitored. A possible solution is non-ambient XRD analysis. Using HT-XRD analysis, it is possible to monitor the mineralogical composition at different temperatures in real time. The results of measurements on chemically precipitated limestone and limestone from the Cretaceous era show slight differences in temperature of decarbonation, but not clearly demonstrated the presence of unstable phases. This measurement, however, allowed the observation of a change in the size of the crystallites in the change of temperature.

Improvement of the Reverse Characteristics of Ti/4H-SiC Schottky Barrier Diodes by Thermal Treatments

2007 ◽  
Vol 124-126 ◽  
pp. 105-108 ◽  
Author(s):  
Dae Hwan Kim ◽  
Jong Ho Lee ◽  
Jeong Hyun Moon ◽  
Myong Suk Oh ◽  
Ho Keun Song ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Schottky Barrier ◽  
Breakdown Voltage ◽  
Schottky Barrier Height ◽  
Xrd Analysis ◽  
Silicide Phase ◽  
Thermal Treatments ◽  
Schottky Barrier Diodes ◽  
Treatment Conditions

Ti/4H-SiC Schottky barrier diodes were fabricated under 500, 750, 1000 °C thermal treatment conditions. After the heat treatment at 750 °C, formation of TiC(111) and Ti5Si3(210) phases was confirmed by XRD analysis. Formation of Ti carbide and silicide phase increased breakdown voltage VB from 545 V to 830 V. An improvement of breakdown voltage (VB) was observed in case of the thermal treatment in nitrogen ambient at 750 °C for 2 min. Ideality factor (n), specific on resistance (Ron), and Schottky barrier height (Φb) were 1.04, 2.7 m-cm2, 1.33 eV respectively.

The Influence of Spraying Distance on the Chemical Composition of Arc Sprayed Layers

2015 ◽  
Vol 754-755 ◽  
pp. 865-868
Author(s):  
Iuliana Silvia Georgescu ◽  
Silviu Ionuţ Ursache ◽  
Elena Raluca Baciu ◽  
Daniel Hriţcu ◽  
Andrei Victor Sandu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Chemical Elements ◽  
Thermal Spraying ◽  
Electric Arc ◽  
Filler Material ◽  
Arc Spraying ◽  
Technological Parameters ◽  
Edax Analysis ◽  
Initial Chemical Composition ◽  
Spraying Method

Arc spraying (AS) is a thermal spraying method. The spraying distance represents one of the main technological parameters. EDAX analysis, performed on the sprayed layers (SDA and SDS), have shown differences between the initial chemical composition of the filler material and of the obtained layers. The quantitative variations determined for Ni, Fe and Cr can be explained by: the volatilization process of the chemical elements from the electric arc area; losses increase with increasing the length of the spraying jet.

scholarly journals Modeling features of the technological process of forestry machines parts strengthening by the method of gas-thermal spraying

2021 ◽  
Vol 2131 (2) ◽  
pp. 022034
Author(s):  
V Kretinin ◽  
A Teppoev ◽  
V Sokolova
Keyword(s):  
Technological Process ◽  
Thermal Spraying ◽  
Flame Spraying ◽  
Technological Parameters ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Conducting Research ◽  
Gas Flame ◽  
Working Bodies ◽  
Spraying Process

Abstract The efficiency of the working bodies of tillage forestry machines is determined by the sharpness of their soil-cutting elements. The purpose of the study is to substantiate the modes of the technological process of strengthening and recovery of cutting working forestry machines by the method of gas-flame spraying of wear-resistant coatings to increase their wear resistance and preserve the blade sharpness by implementing the self-sharpening effect, which allows increasing their life by 2-3 times. Technical and economic indicators of the gas-flame spraying process, as well as the scope of its application, depend on how well the technological modes of the spraying process are selected. The relevance of the topic is due to the need to increase the durability of tillage tools by strengthening their surfaces treatment. Such effective methods include the technology of recovery and strengthening of the working bodies of tillage machines using the technology of gas-flame spraying. In this regard, the issues of conducting research have become particularly relevant: to identify the relationships of technological parameters during the gas-flame application of wear-resistant coatings; to change the strength characteristics of the material of parts during their recovery, providing the necessary reliability and durability.

RESEARCH ON THE PROPERTIES OF THERMAL SPRAYED NI-CR-SI-FE-B COATINGS / TERMINIU BŪDU UŽPURKŠTŲ NI-CR-SI-FE-B DANGŲ SAVYBIŲ TYRIMAS

2013 ◽  
Vol 6 (4) ◽  
pp. 604-607
Author(s):  
Raimonda Lukauskaitė ◽  
Donatas Šiurkus ◽  
Olegas Černašėjus
Keyword(s):  
Thermal Spraying ◽  
Surface Preparation ◽  
Aluminum Surface ◽  
Flame Spray ◽  
Technological Parameters ◽  
Preparation Methods ◽  
Spray Coatings ◽  
Coating Microstructure ◽  
Pre Treatment ◽  
Spraying Process

The article deals with the flame sprayed Ni-Cr-Si-Fe-B coating on aluminum alloy substrates. Before the thermal spraying process, aluminum samples were modified applying chemical, mechanical and thermal processing pre-treatment methods. The main aluminum surface treatment was removing an oxide layer from the surface and improving the exploitation properties of nickel-based coatings. The work involved coating microstructure, porosity, adhesion and microhardness tests. The dependence of the estimated exploitation properties of flame spray coatings on aluminum surface preparation methods and technological parameters of spraying has been established. Santrauka Straipsnyje nagrinėjamos liepsniniu būdu ant aliuminio lydinių substratų užpurkštos Ni-Cr-Si-Fe-B dangos. Aliuminio bandiniai prieš terminį purškimą buvo apdoroti cheminiais, mechaniniais ir terminiais būdais. Pagrindinis aliuminio paviršiaus apdorojimo tikslas buvo pašalinti oksidų sluoksnį nuo paviršiaus ir pagerinti nikelio pagrindo dangų eksploatacines savybes. Atlikti dangos mikrostruktūros, porėtumo, adhezijos ir mikrokietumo tyrimai. Nustatyta liepsninio purškimo būdu gautų dangų eksploatacinių savybių priklausomybė nuo aliuminio paviršiaus paruošimo būdų ir purškimo technologinių parametrų.

Sign in / Sign up

Export Citation Format

Share Document