A Comparison between CoNiCrAlY Bond Coat and Zirconia Plasma Sprayed Coatings on Creep Tests

Thermomechanical and electrical properties of zirconia-based ceramics have led to a wide range of advanced and engineering ceramic applications like solid electrolyte in oxygen sensors, fuel cells and furnace elements and its low thermal conductivity has allowed its use for thermal barrier coatings for aerospace engine components. A comparison between CoNiCrAlY bond coat and zirconia plasma sprayed coatings on creep tests of the Ti-6Al-4V alloy was studied. The material used was commercial Ti-6Al-4V alloy. Yttria (8 wt.%) stabilized zirconia (YSZ) with a CoNiCrAlY bond coat was atmospherically plasma sprayed on Ti-6Al-4V substrates by Sulzer Metco Type 9 MB. Constant load creep tests were conducted on a standard creep machine in air on coated samples, at stress levels of 520 MPa at 500°C to evaluate the oxidation protection on creep of the Ti-6Al-4V alloy. Results indicate that the creep resistance of the ceramic coating was greater than metallic coating.

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Wear Mechanisms of Mcraiy Abradable Plasma-Sprayed Coatings

Thermal Spray 1998: Proceedings from the International Thermal Spray Conference ◽

10.31399/asm.cp.itsc1998p0293 ◽

1998 ◽

Author(s):

S. Li ◽

C. Langlade-Bomba ◽

D. Treheux ◽

F. Crabos ◽

P. Monge-Cadet

Keyword(s):

Wear Mechanisms ◽

Gas Turbines ◽

Coating Microstructure ◽

Blade Tip ◽

Plasma Sprayed Coatings ◽

Plasma Sprayed ◽

Abradable Coatings ◽

Engine Components ◽

New Generation ◽

Sprayed Coatings

Abstract Reduction of operating clearance between the HP turbine and the shroud in the new generation of gas turbines is one way often used by engine manufacturers to improve efficiency. This implies developing a blade tip coating/shroud coating system to minimize the degradation (particularly blades wear) during eventual rubbing. In this study, the chosen systems are: - VPS NiCoCrAIYTa as HP blade tip coating, - Plasma-sprayed MCrAIY coatings deposited under various atmosphere as abradable coatings. In order to understand the wear mechanisms of these systems tribological tests (block on ring and fretting) were performed to study the influence of the coating microstructure on the wear mechanisms. The results were compared and correlated to those of rub tests performed with real engine components.

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An evaluation of plasma-sprayed coatings based on Al2O3 and Al2O3–13wt.% TiO2 with bond coat on pure titanium substrate

Ceramics International ◽

10.1016/j.ceramint.2008.11.017 ◽

2009 ◽

Vol 35 (5) ◽

pp. 2017-2022 ◽

Cited By ~ 43

Author(s):

Şenol Yılmaz

Keyword(s):

Bond Coat ◽

Pure Titanium ◽

Titanium Substrate ◽

Plasma Sprayed Coatings ◽

Plasma Sprayed ◽

Sprayed Coatings

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Comparation between Pulsed Nd:YAG Laser Superficial Treatment and Ceramic Coating in Creep Test of Ti-6-4V Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.660-661.229 ◽

2010 ◽

Vol 660-661 ◽

pp. 229-234 ◽

Cited By ~ 1

Author(s):

Adriano G. Reis ◽

Danieli A.P. Reis ◽

Carlos de Moura Neto ◽

Javier Onõro ◽

H.S. Oliveira ◽

...

Keyword(s):

Laser Treatment ◽

Creep Test ◽

Nd:Yag Laser ◽

Creep Resistance ◽

Ceramic Coating ◽

Constant Load ◽

Creep Tests ◽

Pulsed Nd:Yag Laser ◽

Load Mode ◽

Plasma Sprayed

The objective of this work was evaluating the creep resistance of the Ti-6Al-4V alloy with superficial treatment of pulsed Nd:YAG laser and ceramic coating in creep test of Ti-6Al-4V alloy. It was used Ti-6Al-4V alloy as cylindrical bars under forged and annealing of 190oC by 6 hours condition and cooled by air. The Ti-6Al-4V alloy after the superficial treatment of pulsed Nd:YAG laser and ceramic coating was submitted to creep tests at 600°C and 125 at 319 MPa, under constant load mode. In the Nd:YAG pulsed laser treatment was used an environment of 40 % N and 60 % Ar, with 2.1 W of power and 10 m/s of speed. Yttria (8 wt.%) stabilized zirconia (YSZ) with a CoNiCrAlY bond coat was atmospherically plasma sprayed on Ti-6Al-4V substrates by Sulzer Metco Type 9 MB. The obtained results suggest the laser treatment on Ti-6Al-4V alloy improved its creep resistance.

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Evaluation of Heat Treatment and Ceramic Coating in Creep of Ti-6Al-4V

Materials Science Forum ◽

10.4028/www.scientific.net/msf.660-661.235 ◽

2010 ◽

Vol 660-661 ◽

pp. 235-240 ◽

Cited By ~ 2

Author(s):

Tarcila Sugahara ◽

L.A.N.S. Briguente ◽

L.M. Yogi ◽

Danieli A.P. Reis ◽

Carlos de Moura Neto ◽

...

Keyword(s):

Heat Treatment ◽

Creep Resistance ◽

Stress Condition ◽

Ceramic Coating ◽

High Stress ◽

Life Time ◽

Constant Load ◽

Stabilized Zirconia ◽

Creep Tests ◽

Plasma Sprayed

This study aimed to evaluate the resistance of a Ti-6Al-4V alloy in creep after heat treatments. It was used a Ti-6Al-4V alloy in cylindrical bars forms, forged condition and annealing at 190oC for 6 hours and cooled in air. The microstructure of Ti-6Al-4V alloy was evaluated after heat treatment and was submitted to creep tests at 600oC and stress conditions from 125 to 319 MPa at constant load. The Widmanstätten structure was obtained by heat treatment. Yttria (8 wt.%) stabilized zirconia (YSZ) with a CoNiCrAlY bond coat was atmospherically plasma sprayed on Ti-6Al-4V substrates by Sulzer Metco Type 9 MB. The alloy with Widmanstätten structure and ceramic coating shows greater resistance to creep and oxidation with a longer life time in creep. At higher stress condition, 600°C and 319 MPa, the Ti-6Al-4V alloy with ceramic coating didn’t show higher creep resistance. This condition presented higher tp value and the value. It occurred because at high stress condition the coating is very fragile, decreasing your creep resistance.

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Comparation between PIII Superficial and Ceramic Coating in Creep Test of Ti-6Al-4V Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.660-661.225 ◽

2010 ◽

Vol 660-661 ◽

pp. 225-228

Author(s):

Danieli A.P. Reis ◽

Carlos de Moura Neto ◽

M.M. Silva ◽

Mario Ueda ◽

V.S. Oliveira ◽

...

Keyword(s):

Creep Test ◽

Creep Resistance ◽

Ceramic Coating ◽

Constant Load ◽

Creep Tests ◽

Time Intervals ◽

Treat Ment ◽

Load Mode ◽

Nitrogen Ions ◽

Plasma Sprayed

The objective of this work was evaluating the creep resistance of the Ti-6Al-4V alloy with superficial treatment of PIII superficial treatment and ceramic coating in creep test of Ti-6Al-4V alloy. It was used Ti-6Al-4V alloy as cylindrical bars under forged and annealing of 190oC by 6 hours condition and cooled by air. The Ti-6Al-4V alloy after the superficial treat-ment of PIII and ceramic coating was submitted to creep tests at 600°C and 250 and 319 MPa under constant load mode. In the PIII treatment the samples was put in a vacuum reactor (76x10-3 Pa) and implanted by nitrogen ions in time intervals between 15 and 120 minutes. Yttria (8 wt.%) stabilized zirconia (YSZ) with a CoNiCrAlY bond coat was atmospherically plasma sprayed on Ti-6Al-4V substrates by Sulzer Metco Type 9 MB. The obtained results suggest the ceramic coating on Ti-6Al-4V alloy improved its creep resistance.

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Magnetostrictive Damping to Reduce Noise and Vibrations

MRS Proceedings ◽

10.1557/proc-360-353 ◽

1994 ◽

Vol 360 ◽

Author(s):

A. Karimi ◽

P. H. Giauque ◽

J. L. Martin

Keyword(s):

Heat Treatments ◽

Damping Capacity ◽

Magnetic Domains ◽

Vacuum Plasma Spraying ◽

Wide Range ◽

Cast Alloys ◽

Plasma Sprayed Coatings ◽

Plasma Sprayed ◽

Thermally Sprayed ◽

Sprayed Coatings

AbstractThe magnetomechanical damping capacity of cast and thermally sprayed Fe-Cr based alloys has been investigated using free and forced vibration techniques. The coatings were deposited using a vacuum plasma spraying method and the cast alloys were prepared in a high frequency furnace under an argon atmosphere. Three laboratory devices including a torsion pendulum, a resonant bar and a cantilever were used to cover a wide range of frequencies and amplitudes varying between f = 1Hz to 10 kHz, and ε = 10−6 to 10−3. The damping capacity of the plasma sprayed coatings was found to be comparable to that of cast alloys. Appropriate heat treatments improved the damping capacity of both coatings and cast alloys by several times. The variation of the loss factor as function of the vibration amplitude showed a maximum, but versus frequency exhibited a slightly monotonous character. The magnetic domains were observed using the magneto-optical Kerr effect and their modification under heat treatments was associated with different values of the damping capacities.

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