scholarly journals Selected Parameters of Micro-Jet Cooling Gases in Hybrid Spraying Process

2016 ◽  
Vol 61 (2) ◽  
pp. 621-624 ◽  
Author(s):  
B. Szczucka-Lasota ◽  
T. Węgrzyn ◽  
Z. Stanik ◽  
J. Piwnik ◽  
P. Sidun
Keyword(s):  
Thermal Stress ◽  
Thermal Spraying ◽  
Innovative Technology ◽  
High Velocity Oxygen Fuel ◽  
Jet Cooling ◽  
Structure Of Coatings ◽  
The Relationship ◽  
Oxygen Fuel ◽  
Spraying Process

Abstract The innovative technology, like thermal spraying with a micro-jet cooling is one of the important modification of classical ultrasonic spraying methods. Using of micro-stream with gases like argon or nitrogen allows to cool the coating immediately after spraying, and thereby reduce the time of transition during the injection of each layer. As a result of the process, the fine dispersive structure of coatings is obtained during the shorter time in comparable to the classical high velocity oxygen fuel process (HVOF). The parameter of process and the type of stream equipment determine the quality of the obtained structure and thermal stress in the coating. The article presents the relationship between selected parameters of hybrid process and properties of the coatings. The presented technology should be adapted to the actual production of protective coating for machines and construction working in wear conditions.

scholarly journals ASSESSMENT TRIBOLOGICAL PROPERTIES OF COATINGS APPLIED BY HVOF TECHNOLOGY

2013 ◽  
Vol 7 (3) ◽  
pp. 135-139 ◽  
Author(s):  
Janette Brezinová ◽  
Anna Guzanová ◽  
Dagmar Draganovská ◽  
Marián Egri
Keyword(s):  
Room Temperature ◽  
Adhesive Wear ◽  
Thermal Spraying ◽  
Basic Material ◽  
High Velocity Oxygen Fuel ◽  
Properties Of Coatings ◽  
Oxygen Fuel ◽  
Spraying Method

Abstract In this article, the attention is paid to the HVOF (High Velocity Oxygen Fuel) thermal spraying method by which the progressive coatings are applied on basic material C15E (STN 412020). These coatings are based on C-17CO, WC-CO-Cr and Cr3C2-25NiCr. There was made determination of the chemical composition of the coatings and assessment of coatings quality - adhesion, microhardness, porosity and wear resistance at room temperature (21°C) and also at operational elevated temperature (900°C). Results of adhesive wear showed high quality of all evaluated coatings and their suitability to extreme tribological conditions.

scholarly journals New Technological Concept for Thermal Spray Protective Coatings

2017 ◽  
Vol 62 (3) ◽  
pp. 1499-1504
Author(s):  
B. Szczucka-Lasota ◽  
J. Piwnik
Keyword(s):  
Protective Coating ◽  
Protective Coatings ◽  
High Velocity Oxygen Fuel ◽  
Cooling Process ◽  
Properties Of Coatings ◽  
Jet Cooling ◽  
Structure Of Coatings ◽  
Erosion Properties ◽  
Oxygen Fuel ◽  
Wear Tests

Abstract Thermally spraying with micro-jet cooling is an innovate technology. It is possible to get fine dispersive structure of coatings during the shorter time in comparable to the classical high velocity oxygen fuel process (HVOF). It corresponds with good corrosion-erosion properties of structure. In the paper the parameters of the spraying with micro-jet cooling process are presented. The selected properties of coatings obtained by hybrid method are presented. The results of wear tests for hybrid and HVOF coating are compared. Results of investigation are very optimistic. The presented technology should be adapted to the actual production of protective coating for machines and construction working in wear conditions.

High Temperature Resistance of Selected HVOF Coatings

2015 ◽  
Vol 662 ◽  
pp. 111-114 ◽  
Author(s):  
Šárka Houdková ◽  
Jan Černý ◽  
Zdeněk Pala ◽  
Petr Haušild
Keyword(s):  
High Temperature ◽  
Thermal Spraying ◽  
High Velocity Oxygen Fuel ◽  
Temperature Oxidation ◽  
Ni Alloys ◽  
The Stability ◽  
Temperature Exposure ◽  
Oxygen Fuel ◽  
Hardness Values ◽  
Composition Changes

The HVOF (high velocity oxygen fuel) thermal spraying technology is widely used for creation of coatings notable for their resistance against various kinds of loading. Depending on the sprayed material, the coatings suitable for high temperature applications can be sprayed as well. The coatings, based on CrC or Co/Ni alloys, offer the advantageous combination of high temperature oxidation resistance and the wear resistance. In the paper, the attention is paid to the evaluation of the influence of the high temperature on the coatings microstructure and mechanical properties, namely hardness. The stability of the hardness values in respect to the time of the high temperature exposure is presented and related to the phase composition changes.

Nanostructured Cermet Coatings with Enhanced Properties Produced by HVOF Thermal Spray

2008 ◽  
Vol 587-588 ◽  
pp. 1024-1028 ◽  
Author(s):  
S. Dosta ◽  
J.R. Miguel ◽  
J.M. Guilemany
Keyword(s):  
Wear Resistance ◽  
Nanostructured Coating ◽  
Important Improvement ◽  
Hvof Thermal Spray ◽  
Enhanced Properties ◽  
Xrd Techniques ◽  
The Relationship ◽  
Oxygen Fuel ◽  
Spraying Process ◽  
Flight Measurements

There is an increasing interest in the last years for materials with nanometric grain size because of the enhanced properties that could be achieved when reducing to the nanometric scale. Three coatings using conventional, nanostructured and bimodal (mixture of conventional and nano) WC-Co powders were obtained through High Velocity Oxygen-Fuel (HVOF) technique. The powders were sprayed under different spraying conditions in order to improve trybological properties for nanostructured powders. The relationship between spraying conditions and decomposition has been studied using in-flight measurements and XRD techniques. The nanostructured coating showed more decomposition than the other ones during spraying process, but this decomposition was reduced through the new conditions. Nanostructured coating showed more hardness using producer conditions, but the bimodal coating showed better abrasive and friction wear resistance. Nanostructured and bimodal coatings also provided an enhanced corrosion protection to the substrate when compared with the conventional one. An important improvement in the abrasive wear resistance for the nanostructured coating was obtained with the new conditions, due to the reduction in the decomposition.

Numerical analysis of particle impacting and bonding processes during high velocity oxygen fuel spraying process

2016 ◽  
Vol 366 ◽  
pp. 187-192 ◽  
Author(s):  
Jiajing Pan ◽  
Shengsun Hu ◽  
Anning Niu ◽  
Kunying Ding ◽  
Lijun Yang
Keyword(s):  
Numerical Analysis ◽  
High Velocity ◽  
High Velocity Oxygen Fuel ◽  
Oxygen Fuel ◽  
Spraying Process
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