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To delay wear resistance, coating methods have changed significantly in recent decades due to the tribological demands of thermal spray coatings for wear-resistant tasks.
The expectations for the specific performance and longevity of mechanical parts are always growing.Mechanical components are destined to experience all kinds of severe wear and temperature fluctuations throughout their lifespan, and scientists are always looking to extend the life of components.
This is where advanced materials like composites come in.To retard wear resistance, coating methods have changed significantly in recent decades due to the tribological demands of thermal spray coatings for wear-resistant tasks.
Thermal spraying is one of the most effective coating deposition processes for improving wear and corrosion resistance.It’s a technique that works with almost any substance and can produce coatings ranging in depth from a few micrometers to a few millimeters.
The unique properties of NiCrBSi-WC such as thermal stability, high wettability, high temperature wear resistance, and resistance to corrosion deposits make it a popular choice among the different alloy systems available.
At high temperatures, NiCrBSi alloys exhibit unique properties such as the ability to absorb additional elements, the development of cohesive and ordered strengthening phases, and the stability of the microstructure.
Si and B are mainly responsible for wetting and lowering the melting point of NiCrBSi, Cr is used to improve the oxidation resistance and corrosion resistance of the alloy, and C, B and Fe all contribute to the hardness and wear resistance of the alloy.
When the concentration of B is high enough, boride and carbide crystals are formed.Therefore, the NiCrBSi alloy is further strengthened.
On the other hand, the properties of NiCrBSi are unique.The content of elements cannot be changed indefinitely to improve the alloy.
Introducing ceramic particles into NiCrBSi coatings to improve their hardness and wear resistance is a suitable technique.Tungsten carbide (WC) is a key enhancer in the development of high wear resistant coatings.WC particles with high melting temperature and excellent hardness provide sufficient support for the NiCrBSi alloy matrix under harsh corrosion conditions.
As mentioned earlier, the coating is performed on components that experience high friction and temperature fluctuations.Rolls and other NiCrBSi-coated equipment used in demanding industries such as hot strip mills are subject to high wear.
These are also used in bearings for turbofan/turboshaft engines in aerospace applications; these bearings support the shaft connecting the compressor and turbine blades, which are subject to extreme temperatures and high friction.In addition, it is used in piston engines on piston heads, as it is subject to high temperatures and high wear.
A technological advance is thermal spraying, including flame spraying (FS), plasma spraying (PS) and high velocity oxygen fuel (HVOF) spraying techniques, commonly used for NiCrBSi coatings.
On the other hand, thermally applied NiCrBSi coatings typically have low to moderate adhesion to substrates and are porous.
The strength and fatigue resistance of plasma sprayed coatings are affected by many defects, such as porosity and unmelted particles.
Meanwhile, for the NiCrBSi coating, the amorphous phase is always present, which is generated due to the rapid cooling of the molten particles during the accumulation process, which reduces the volume cross-section of the hard phase, thereby reducing the toughness and corrosion resistance.
Evaluation of tensile and flexural properties is difficult due to the strength of the intermolecular forces connecting the different faces between the stack and the substrate.
In this paper, the effects of short-term laser and focused heat treatment on the mechanical properties of NiCrBSi-WC and NiCrBSi coatings were investigated.Furthermore, the effects of existing different interfacial chemistries and topologies on the bond strength of the substrates were investigated and correlated with the material properties of NiCrBSi-WC coatings and NiCrBSi coatings.
Since this method increases the material’s viability, it can be used in all kinds of high-performance components that are currently unable to reach their full potential due to high wear and thermodynamic stress.
These include turbine blades in turbojet engines, temperature regulation of combustion chambers in piston engines so that the piston head does not melt, and similarly all other applications where temperature is the limiting factor.
Some obvious disadvantages or limitations of laser processing include the dissolution of WC particles in the molten nickel-based matrix, which increases porosity and reduces the hardness of the alloy.
In order to omit some of the shortcomings of existing methods, the following methods should be investigated and applied: parameter optimization, substrate preheating, formation of gradient coatings, addition of rare earth elements and other compounds.
Chen, C., Du, C., Pan, Q., & Chen, Q. (2021).Effects of post-heat treatment on the parenchyma and mechanical properties of laser-deposited WxC + Ni matrix composites.Journal of Materials Engineering and Properties, 30(1), 423-433.https://link.springer.com/article/10.1007/s11665-020-05346-z
Deenadayalan, K., Murali, V., Elayaperumal, A., & Arulvel, S. (2021).Effective effect of short-time furnace heat treatment and laser treatment on residual stress and mechanical properties of plasma transferred arc welded NiCrBSi-WC weldments.Journal of Materials Research and Technology, 15, 3492-3513.https://www.sciencedirect.com/science/article/pii/S2238785421011029
Sha, J., Chen, L.-y., Liu, Y.-T., Yao, Z.-J., Lu, S., & Wang, Z.-X. (2020).Phase-transition-induced improvement in hardness and high-temperature wear resistance of plasma sprayed and remelted NiCrBSi-WC coatings.Metals, 10 (1688), 1-15.https://www.researchgate.net/publication/347821619_Phase_Transformation-Induced_Improvement_in_Hardness_and_High-Temperature_Wear_Resistance_of_Plasma-Sprayed_and_Remelted_NiCrBSiWC_Coatings
Škamat, J., Cernašejus, O., Zhetessova, G., Nikonova, T. and Zharkevich, O. (2021).Effects of laser processing parameters on the microstructure, hardness and tribology of NiCrCoFeCBSi-WC coatings.Materials (14), 1-15.https://www.mdpi.com/1996-1944/14/20/6034
Yao, SH (2014).Tribological behavior of NiCrBSi-WC(Co) coatings.Materials Research Innovation, 18(2), 12-18.https://www.tandfonline.com/doi/abs/10.1179/1432891714Z.000000000436
Disclaimer: The views expressed here are those of the author in their personal capacity and do not necessarily represent the views of AZoM.com Limited T/A AZoNetwork, the owner and operator of this website.This disclaimer forms part of the terms and conditions of use of this website.
Ibtisam is a graduate of Islamabad Institute of Space Technology with a bachelor’s degree in aerospace engineering.During his academic career, he has been involved in several research projects and successfully managed several extracurricular events such as the International World Space Week and the International Aerospace Engineering Conference.Ibtisam held an English essay competition during his undergraduate years and has always been very interested in research, writing and editing.Shortly after graduation, he joined AzoNetwork as a freelancer to improve his skills.Ibtisam loves to travel, especially to the countryside.He has always been a sports fan and enjoyed watching tennis, football and cricket.Born in Pakistan, Ibtisam hopes to one day travel the world, forging strong bonds of friendship and spreading the message of peace and love.
Abbasi, Ibtisam.(26 October 2021).Evaluation of the properties of NiCrBSi-WC weldments after heat treatment and laser treatment.AZOM.Retrieved March 23, 2022 from https://www.azom.com/article.aspx?ArticleID=20890.
Abbasi, Ibtisam.”Evaluating the Properties of NiCrBSi-WC Weldments After Heat and Laser Treatment”.AZOM.March 23, 2022..
Abbasi, Ibtisam.”Evaluating the Properties of NiCrBSi-WC Weldments After Heat and Laser Treatment”.AZOM.https://www.azom.com/article.aspx?ArticleID=20890.(Accessed 23 March 2022).
Abbasi, Ibtisam.2021. Evaluation of the properties of NiCrBSi-WC weldments after heat treatment and laser treatment.AZoM, accessed March 23, 2022, https://www.azom.com/article.aspx?ArticleID=20890.
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