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Suspension Plasma Spray
Published in Navid Hosseinabadi, Hossein Ali Dehghanian, Suspension Plasma Spray Coating of Advanced Ceramics, 2022
Navid Hosseinabadi, Hossein Ali Dehghanian
Suspension plasma spray is a process that enables the use of thermal spray feedstocks too small for conventional plasma spray processes. These feedstocks come in the form of a slurry, with micron- and submicron-sized particles suspended in water or any other solvents. In fact, the concentration of the particles in the slurry can be controlled and ranges from 5–80% by weight. This allows for the best combination of coating microstructure and precipitation rate to be gained. During the process, the thermal spray slurry is pumped to the outlet of the thermal spray burner and injected into the thermal spray jet. When the particles enter the plasma medium, the droplets fragment and the liquid phase evaporates, leaving ultrafine particles moving and hitting the substrate at an accelerated velocity. By using these ultrafine particle sizes, uniform coatings are fabricated as thin as 30 microns thick [7].
Design and experimental investigation of an internal mixing twin-fluid atomiser for the generation of test aerosol particles
Published in Australian Journal of Mechanical Engineering, 2023
Amit M. E. Arefin, Anan Ashrabi Ananno, Mahadi Hasan Masud, Mostafijur Rahman, Monjur Mourshed, Kamrun Nahar, Shamim Akhter
In recent years, many studies have been conducted on the atomisation characteristics. As of the present time, the experimental investigation is the main approach of characterising atomisers because of the sensitivity, practicality, and reliability of the studies (Sen Guan, Li, and Zhang 2018). Lefebvre proposed a potential utilisation of the internal mixing-twin fluid atomisers to gas turbines (Lefebvre 2014). Wade et al. endeavoured in the effort to its application to the fuel injection process in diesel engines (Wade et al. 1999). Esfarjani et al. and Qian et al. studied its application on spray coating, specifically for suspension plasma spray (Esfarjani and Dolatabadi 2009, Qian, Lin, and Xiong 2011). Loebker et al. proposed the utilisation of the internal mixing-twin fluid atomiser for the process industries of black liquor (Loebker and Empie 1998). Lal et al. and Huang et al. suggested this type of atomiser to be used for fire suspension (Huang, Wang, and Liao 2011, Lal et al. 2010). Numerous experimental observations and computational simulations have also investigated break-up characteristics and performance of IMTF. The findings of recent studies on IMTF are summarised in Table 1 (Murugan, Kolhe, and Sahu 2020; Murugan, Balusamy, and Kolhe 2020; Hashiguchi et al. 2019; Ochowiak et al. 2018; Li et al. 2018; García et al. 2017).
An overview of recent developments in nanocoatings and biodiesel production for diesel engine application
Published in International Journal of Ambient Energy, 2021
S. Vijaya Kumar Reddy, S. R. Premkartikkumar
He et al. (2016) investigated the tribosystem of engine cylinder coated with TiO2-12wt% Al2O3. They showed a significant enhancement in tribological properties of coated parts. These coated parts also have high chemical stability to oil, good surface finish and high hardness. Hajizadeh-Oghaz, Shoja Razavi, and Ghasemi (2015) successfully prepared ceria–yttria co-stabilised zirconia (CYSZ) nanoparticles by using the Pechini technique. The average size of particle formation by this method was 25 nm. The prepared particles underwent the TBC applications because they impact the crystallite structure and drop the thermal conductivity of the top layer. Vardelle et al. (2015) concluded that the plasma spray technology with its advancements incorporates the splashing of fluid feedstock as submicrometric particles or synthetic forerunners in a dissolver and coatings framed by vapour condensation onto the substrate. These are generally make conceivable the generation of more slender coatings than in air plasma splashing with a fine and even nanostructured microstructure. Mahade et al. (2017) compared the heat conduction and thermal cyclic life of one-fold layer 8YSZ, two-fold layer GZ (gadolinium zirconate)/YSZ and three-fold layer GZ/YSZ coatings via a suspension plasma spray method on gas turbine blades. The result shows that the thermal conductivity and thermal diffusivity lowered and thermal cycling life was improved in multilayer GZ/YSZ coating.