Superior Thermal Barrier Coatings Using Solution Precursor Plasma Spray

Jordan, E. H.; Xie, Liangde; Gell, Maurice; Padture, Nitin P.; Cetegen, Baki M.; Ozturk, Alper; Roth, Jeffrey; Xiao, T. D.; Bryant, Peter E.

doi:10.1361/10599630418121

Cited by 11 publications

(19 citation statements)

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“…8 However, the primary difference attribute between SPPS and other methods is that the feedstock material is in the form of a liquid solution rather than a powder or a powder suspension. Similar to the existing plasma deposition methods, SPPS is based on the injection of liquid chemical precursors into a plasma jet and forming of a ceramic by pyrolysis in the plasma jet.…”

Section: Process Methodsmentioning

confidence: 99%

Processing, microstructures and properties of thermal barrier coatings (TBCs) by plasma spraying (PS)

Chen

2011

Thermal Barrier Coatings

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Section: Process Methodsmentioning

confidence: 99%

Processing, microstructures and properties of thermal barrier coatings (TBCs) by plasma spraying (PS)

Chen

2011

Thermal Barrier Coatings

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“…The proprietary solution precursor plasma spray (SPPS) process enables discrete organization of the porosity structure into layers, forming inter-pass boundaries (IPBs), which in turn produces a step-reduction in thermal conductivity for a given porosity level. [14][15][16][17][18][19][20] Investigations with SPPS Figure 2. Evolution of heat release rates and combustion phasing with the accumulation of thermally insulating combustion chamber deposits.…”

Section: Introductionmentioning

confidence: 99%

“…However, increasing the overall porosity fraction of a traditional YSZ coating jeopardizes the coating's structural integrity and resistance to erosion. [14][15][16][17][18][19][20] Thus, a different technique is needed to enable practical, low conductivity coatings while maintaining TBC durability.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Powell

O’Donnell

Hoffman

et al. 2019

International Journal of Engine Research

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Heat transfer has a profound influence on homogeneous charge compression ignition combustion. When a thermal barrier coating is applied to the combustion chamber, the insulating effect magnifies the wall temperature swing, decreasing heat transfer during combustion. This enables improvements in both thermal and combustion efficiency without the detrimental impacts of intake charge heating. Increasing the temperature swing requires coatings with lower thermal conductivity and heat capacity. A promising avenue for simultaneously decreasing both thermal conductivity and capacity is to increase the porosity fraction. A proprietary solution precursor plasma spray process enables discrete organization of the porosity structure, called inter-pass boundaries, which in turn produces a step-reduction in thermal conductivity for a given porosity level. In this investigation, yttria-stabilized zirconia is used to create four different thermal barrier coatings to study the potential of structured porosity as means of improving the “temperature swing” behavior in a homogeneous charge compression ignition engine. The baseline coating is “dense YSZ,” applied using a standard air-plasma spray process. Next, significant reductions of the thermal conductivity are achieved by utilizing the solution precursor plasma spray process to create inter-pass boundaries with a moderate overall porosity. Performance, efficiency, and emissions are compared against both a baseline configuration with a metal piston and an air-plasma spray “dense YSZ” coating. Experiments are carried out in a single-cylinder gasoline homogeneous charge compression ignition engine with exhaust re-induction. Experiments indicate that incorporating structured porosity into thermal barrier coatings produces tangible gains in combustion and thermal efficiencies. However, there is an upper limit to porosity levels acceptable for homogeneous charge compression ignition engine application because an elevated porosity fraction leads to excessive surface roughness and undesirable fuel interactions. Comparison of the coatings showed the best results with coating thickness of up to 150 µm. Thicker coatings led to slower surface temperature response and attenuated swing temperature magnitude.

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“…1 Eu: Y 2 O 3 is also a thermographic phosphor, whose luminescent properties are temperature sensitive and which can be used to measure surface temperature by applying a thin coating of phosphors to a substrate. Recently, a solution precursor plasma spray (SPPS) process has been developed for the deposition of highly durable thermal barrier coatings, [9][10][11][12][13] dense and hard coatings, 14,15 bioactive coatings, 16 and porous coatings. [2][3][4] Phosphor coatings have been deposited by a variety of techniques such as R.F sputter, 5 spray pyrolysis, 6 sol-gel, 7 and pulsed laser deposition.…”

Section: Introductionmentioning

confidence: 99%

Solution Precursor Plasma Spray Eu: Y₂O₃ Phosphor Coating

Chen

Jordan

Renfro

et al. 2012

Int J Applied Ceramic Tech

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Using the solution precursor plasma spray process Eu: Y2O3 phosphor coating was deposited. The phase composition, microstructure, and photoluminescent properties of the as‐synthesized powders and as‐deposited coatings were investigated. XRD analysis indicated that the coating is composed of cubic Y2O3. SEM micrographs reveal the as‐sprayed coating is porous with a thickness of ~150 μm. Photoluminescent property measurement indicated that the phosphor coating exhibits the strongest emission at 612 nm, which is assigned to 5D0 → 7F2 electric‐dipole transition.

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Superior Thermal Barrier Coatings Using Solution Precursor Plasma Spray

Cited by 11 publications

References 0 publications

Processing, microstructures and properties of thermal barrier coatings (TBCs) by plasma spraying (PS)

Processing, microstructures and properties of thermal barrier coatings (TBCs) by plasma spraying (PS)

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Solution Precursor Plasma Spray Eu: Y₂O₃ Phosphor Coating

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Superior Thermal Barrier Coatings Using Solution Precursor Plasma Spray

Cited by 11 publications

References 0 publications

Processing, microstructures and properties of thermal barrier coatings (TBCs) by plasma spraying (PS)

Processing, microstructures and properties of thermal barrier coatings (TBCs) by plasma spraying (PS)

Experimental investigation of the relationship between thermal barrier coating structured porosity and homogeneous charge compression ignition engine combustion

Solution Precursor Plasma Spray Eu: Y2O3 Phosphor Coating

Contact Info

Product

Resources

About

Solution Precursor Plasma Spray Eu: Y₂O₃ Phosphor Coating