Thermal shock behavior of nanostructured and conventional Al2O3/13 wt%TiO2 coatings fabricated by plasma spraying

Wang, Youshan; Wang, Tian; Yang, Yong

doi:10.1016/j.surfcoat.2007.03.015

Cited by 91 publications

(34 citation statements)

References 27 publications

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“…The thermal shock resistance for all samples tested from 650 °C is higher than the 69 cycles before failure obtained by Wang [4] cooling from 1000 °C and its failure criteria was the number of cycles before 20% of coating area exposed to thermal shock shows damage, which is less aggressive than the heat temperature of coatings and failure criteria used in this study.…”

Section: Thermal Shock Resistancementioning

confidence: 55%

“…Additionally, in Table 3 have nano-agglomerated particles allowing bimodal structures formed by fully molten and semi-molten particles that retain the characteristics and properties of nano-agglomerated powders and then arrest the cracks advance produced during thermal shock tests, and for hence this micro-structure allow to get better resistances [4,[11][12][13][14]. On the other hand, the Ni-WC shows behaviors of composite, with a thermo-elastic matrix and ceramic particles that also allow to stop the cracks getting better resistances as well.…”

Section: Thermal Shock Resistancementioning

confidence: 99%

“…The results indicate that coatings sprayed from nano-agglomerated particles have higher resistance than those manufactured from fused and crushed powders, reaching 69 cycles at 650 °C and 6 cycles at 850 °C for the nano-agglometared particles, and 42 cycles at 650 °C and 3 cycles at 850 °C for the fushed and crushed micrometrical powders. In this case the thermal shock resistance was established as the cycle number which a visible failure area was detected [4]. The thermal shock resistance was evaluated by fast cooling from 650 °C and 1100 °C to room temperature using water.…”

Section: Introductionmentioning

confidence: 99%

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Study of thermal shock resistance of flame sprayed coatings manufactured to protect molds used in glass containers industry

Franco

Vargas

López

2016

Ingeniare. Rev. chil. ing.

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Molds used in glass manufacturing are subjected to continuous heating and cooling cycles, which result in their premature failure by thermal fatigue. In order to protect these molds a nickel alloy (Eutectic Castolin CPM 1205 TM ) was deposited as bond coat by flame spraying onto compacted graphite iron substrates and then, Al 2 O 3 -40 wt. % TiO 2 , ZrO 2 -36 wt. % Al 2 O 3 and Al 2 O 3 , as well as a Ni-WC cermet, were sprayed as a top coatings using super oxidized and slightly oxidized flames. The effect of the flame type and the thickness of coatings on thermal shock resistance were evaluated. The results obtained indicate that coatings of Ni-WC sprayed from Eutectic Castolin 10112 TM powders using a slightly oxidized flame, and ZrO 2 -Al 2 O 3 coatings manufactured from nano-agglomerated Eutectic Castolin 25088 TM powders with an super oxidized flame showed the best performances. The nature of Ni-WC cermets allowed increasing the thermal shock resistance due to the thermo-elastic behavior of nickel matrix and the arrest crack effect characteristic of composite materials. Likewise, in ZrO 2 -Al 2 O 3 coatings, the bimodal microstructure that this kind of coatings shows contributed to increase the thermal shock resistance. The better performances of both coatings were obtained with a porosity level between 20% and 40%.Keywords: Flame thermal spaying, nickel alloy bond coat, cermet top coating, ceramic top coating, thermal shock resistance. RESUMEN Los moldes usados en la manufactura de vidrio están sujetos a continuos ciclos de calentamiento y enfriamiento, lo que resulta en fallas prematuras por fatiga térmica. Con la idea de proteger estos moldes, una aleación de níquel (Eutectic

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Section: Thermal Shock Resistancementioning

confidence: 55%

Section: Thermal Shock Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of thermal shock resistance of flame sprayed coatings manufactured to protect molds used in glass containers industry

Franco

Vargas

López

2016

Ingeniare. Rev. chil. ing.

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“…1,2 Studies have centred on ceramic-metal composites (cermets of the WC-Co type) and ceramic oxides. [3][4][5][6][7] The reason for this choice is based on the particular characteristics of ceramic materials, such as high hardness and high thermal and corrosion resistance, which provide many advantages compared to polymers and metals when it comes to use as coatings, especially in applications in which wear, temperature, and corrosion resistance are simultaneously required.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Alumina from Freeze-Dried Precursors

Villanueva

Gómez

Burguete

et al. 2010

Journal of the American Ceramic Society

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Nanocrystalline alumina has been obtained on the 100-g scale by thermal decomposition of precursors resulting from the freeze-drying of aqueous solutions of different aluminium-containing products, namely aluminium acetate and aluminium L-lactate. Samples prepared at different temperatures (from 873 to 1573 K in steps of 100 K) were characterized by X-ray powder diffraction, scanning and transmission electron microscopy, and surface area measurements. In the acetate case, the transformation sequence to allow it to be thermal sprayed and deposited on a stainless steel substrate. X-ray powder diffraction data show that γ-Al 2 O 3 is the major phase in the coating, which includes also α-Al 2 O 3 particles. SEM results offer evidences on the nanostructured character of the coating.

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“…The nanostructured Al 2 O 3 -13 wt%TiO 2 coatings possessed much more excellent wear, thermal shock and spallation resistance than conventional coatings with the same composition. Plasma sprayed nanostructured Al 2 O 3 -13 wt%TiO 2 coatings have been successfully used in the US Navy [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical corrosion behavior of plasma sprayed Al₂O₃‐13%TiO₂ coatings in aqueous hydrochloric acid solution

Wang

Zhang

Yang

2010

Materials & Corrosion

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One kind of conventional and two kinds of nanostructured Al 2 O 3 -13%TiO 2 coatings were prepared by plasma spray process. The phase composition and microstructure of coatings were examined by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to investigate the corrosion behavior of coatings in aqueous hydrochloric acid solution. The results showed that nanostructured coatings had superior corrosion resistance compared to conventional Metco 130 coating. The corrosion resistance of coatings was mainly related to their microstructure and defects density. The EIS measurement for long time immersion in hydrochloric acid solution revealed that the corrosion resistance of coatings decreased with the increasing of immersion time. During the immersion period, electrochemical corrosion mainly occurred on the carbon steel substrate under NiCrAl coatings. In addition, the Al 2 O 3 -13%TiO 2 coatings were also failed during corrosion in aqueous hydrochloric acid solution.

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Thermal shock behavior of nanostructured and conventional Al2O3/13 wt%TiO2 coatings fabricated by plasma spraying

Cited by 91 publications

References 27 publications

Study of thermal shock resistance of flame sprayed coatings manufactured to protect molds used in glass containers industry

Study of thermal shock resistance of flame sprayed coatings manufactured to protect molds used in glass containers industry

Nanostructured Alumina from Freeze-Dried Precursors

Electrochemical corrosion behavior of plasma sprayed Al₂O₃‐13%TiO₂ coatings in aqueous hydrochloric acid solution

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Thermal shock behavior of nanostructured and conventional Al2O3/13 wt%TiO2 coatings fabricated by plasma spraying

Cited by 91 publications

References 27 publications

Study of thermal shock resistance of flame sprayed coatings manufactured to protect molds used in glass containers industry

Study of thermal shock resistance of flame sprayed coatings manufactured to protect molds used in glass containers industry

Nanostructured Alumina from Freeze-Dried Precursors

Electrochemical corrosion behavior of plasma sprayed Al2O3‐13%TiO2 coatings in aqueous hydrochloric acid solution

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Electrochemical corrosion behavior of plasma sprayed Al₂O₃‐13%TiO₂ coatings in aqueous hydrochloric acid solution