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Fig 7.2 Aluminium With Zirconia Coated

The document discusses coating aluminium with zirconia. It shows images of uncoated versus coated aluminium and provides hardness test results, showing that the coated aluminium has a slightly higher hardness. Salt spray tests showed rust formation on uncoated aluminium within 12 hours, while no rust was observed on coated aluminium within the same time period. The conclusion discusses how thermal barrier coatings on engine components can reduce surface temperatures and thermal stresses, lowering fuel consumption and improving engine performance and component lifetimes.

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87 views6 pages

Fig 7.2 Aluminium With Zirconia Coated

The document discusses coating aluminium with zirconia. It shows images of uncoated versus coated aluminium and provides hardness test results, showing that the coated aluminium has a slightly higher hardness. Salt spray tests showed rust formation on uncoated aluminium within 12 hours, while no rust was observed on coated aluminium within the same time period. The conclusion discusses how thermal barrier coatings on engine components can reduce surface temperatures and thermal stresses, lowering fuel consumption and improving engine performance and component lifetimes.

Uploaded by

rajkiran_raj
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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7.2 ALUMINIUM WITH ZIRCONIA COATED

FIG 7.2 ALUMINIUM WITH ZIRCONIA COATED


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7.3 HARDNESS TEST

UNCOATED ALUMINIUM COATED ALUMINIUM

HARDNESS HARDNESS

46,44,44 48,49,50

TABLE 7.1 HARDNESS COMPARISON


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7.4 SALT SPRAY TEST RESULT


Chamber Temperature : 34.5-35.5 c
Ph value : 6.65-6.85
Volume of salt solution : 1.0-1.5ml/hr
Concentration of solution : 5%Nacl
Air pressure : 14-18 Psi
Components loading in the camber Position:30 Degree Angle.

OBSERVATION:While Rust formation Noticed at 12 Hrs.

SALT SPRAY TEST:


Chamber Temperature : 34.5-35.5c
Ph value : 6.65-6.85
Volume of salt solution : 1.0-1.5ml/hr
Concentration of solution : 5%Nacl
Air pressure : 14-18 Psi
Components loading in the camber Position:30 Degree Angle.

OBSERVATION:No Rust formation Noticed at 12 Hrs.


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CONCLUSION
In this project, effects of the TBC system on the engine performance and the
components lifetime are reviewed in diesel engine applications.
It is clear that there is a large temperature drop for the coated piston due to the
thermal barrier coating applied on the crown surface. Also, the piston ring groove
temperatures for the coated piston are less than the piston grooves of the uncoated piston.
Although the surface temperature of coated piston crown is more than uncoated one, but
also the temperature gradient is reduced for coated piston in comparison with uncoated
one. This can cause less thermal stresses.
As a result the fuel consumption reduces, the engine power and the combustion
efficiency increases, pollution contents decrease, and the fatigue lifetime of engine
components such as the piston improves due to the reduction of 100°C in the surface
temperature and also the reduction of the temperature gradient and thermo-mechanical
stresses of the substrate.
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REFERENCES

1.Hao xuhong,.Preparation and properties of Y2O3-doped ZrO2 thin films


By the sol–gel process, Surface Coating Technology (1997)
2. J. Kopecki, Experimental and numerical life prediction of thermally
cycled thermal barrier spray coatings Journal of thermal spray technology
13(3),415-424
3.Morel T. “Heat Transfer Experiments in an Insulated Diesel”, SAE
International, Paper No.880186
4.J.Reschke H.Performance analysis of adiabatic engine,SAE
International paper no.840431
5.Sulaiman bin alias.Overview of thermal barrier coatings in diesel
Engines,thermal spray technology,6(1),50-56
6.J. Schindhelm (Surface modification of zirconia thermal Barrier coatings,
J. Mate.Sci. Let., 15(3), 214-218,(1996).
5.Zhang T. Experimental research on the thermal contact resistance
Between Cu-Cu in vacuum and low temperature. Cryogenics, 1999.
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