Microstructure of sol–gel derived corundum containing coatings

Nofz, Marianne; Dörfel, I.; Sojref, Regine

doi:10.1016/j.tsf.2007.03.029

Cited by 9 publications

(5 citation statements)

References 30 publications

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“…Formation of phases in coatings or at their interfaces with the substrates is also influenced by diffusion of ions from the substrates as shown, e.g., for soda-lime glass (Dressler et al 2008b) or Ni-base alloy Inconel718 (Nofz et al 2007;Dressler et al 2012). Diffusion of iron, manganese, and chromium from steel into an alumina coating was shown to lower the temperature of formation of α-Al 2 O 3 by 150 C (Chui-Sabourin and Garofalini 1991).…”

Section: Gelation Densification and Phase Transitions Of Coatingsmentioning

confidence: 98%

“…• Redispersion of powders in ethanol (e.g., Nofz et al 2007) • Redispersion of powders in water and peptization by HNO 3 (e.g., Agrafiotis and Tsetsekou 2002;Jia et al 2007) or HCl (e.g., Villegas et al 2007) • Hydrolysis of aluminum alkoxides in a large excess of hot water by the Yoldas process (Yoldas 1975a, b, c) Powders used for redispersion were either commercially available ones as used by the authors mentioned above or were synthesized by hydrolysis of aluminum salts dissolved in water by addition of a base (e.g., Seok et al 2006). A summary of work on inorganic salt-derived alumina sols using aqueous precursors can be found in the first edition of this handbook (Ohya 2005).…”

Section: Preparation and Properties Of Coating Sols Preparation Of Comentioning

confidence: 99%

“…Densification and phase transitions of alumina coatings were most often realized by heat treatments in furnaces in air (e.g., Nofz et al 2007), vacuum or inert gas atmosphere (e.g., H€ ubert et al 2006a, b), or under oxygen flow to promote organic burnout (Pillonet-Minardi et al 2001). Burning of the samples in a Bunsen burner flame was also described (Eckert et al 2010).…”

Section: Gelation Densification and Phase Transitions Of Coatingsmentioning

confidence: 99%

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Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

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This chapter gives an overview over preparation, properties, and applications of alumina thin films. The preparation of polymeric and colloidal alumina sols and their deposition on diverse substrate materials with different geometries are described first. Consideration of properties (surface tension, particle size, viscosity, aging of the sols, and their optimization by using certain additives) is included, too. A description of posttreatments of the coatings, which initiate phase transformations and also determine their microstructure, completes the part on coating preparation. Data on adhesion, thickness, surface roughness, and mechanical, textural as well as optical properties of alumina thin films are provided in a further paragraph. In a third main part, experience concerning possible applications, such as (i) membranes for catalysis, separation, and filtration, (ii) barrier layers against electrochemical and high-temperature corrosion or interdiffusion of ions between different phases, (iii) mechanical protection, (iv) sensor construction, (v) improvement of optical properties, as well as (vi) achieving water repellency, is summarized.

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Section: Gelation Densification and Phase Transitions Of Coatingsmentioning

confidence: 98%

Section: Preparation and Properties Of Coating Sols Preparation Of Comentioning

confidence: 99%

Section: Gelation Densification and Phase Transitions Of Coatingsmentioning

confidence: 99%

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Alumina Thin Films

Nofz¹

2016

Handbook of Sol-Gel Science and Technology

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“…Pure and highly porous α-Al2O3 powders were obtained via the sol-gel process in the experimental studies that our research group previously carried out [17,18]. In this work, aluminum isopropoxide (AIP) was used as the metal alkoxide starting material to synthesize pure α-Al2O3 powders via the sol-gel process [12,[19][20][21]. Derivation of the BHA powders was realized from natural sources, i.e.…”

Section: Introductionmentioning

confidence: 99%

In-Vitro Bioactivity Investigation of Sol-Gel Derived Alumina-Bovine Hydroxyapatite (BHA) Composite Powders

Yelten¹,

Karal-Yılmaz²,

Akgüner³

et al. 2020

Gazi University Journal of Science

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Synthesis of the AlOOH gel via the sol-gel procedure was described in detail.• Production steps of the AlOOH-bovine hydroxyapatite (BHA) mixtures were explained.• Preparation of Al2O3-BHA composite powders was achieved through the heat-treatment process.• Chemical, microstructural and physical analyses of the composite powders were performed.• In-vitro bioactivity (MTT assay) characterization of the composite powders suggested great promise.

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“…15 Most of the sol-gel coatings developed earlier was sintered in an oxygen environment. [16][17][18][19] On the contrary, much less attention has been paid on sintering of sol-gel coatings in other environments like nitrogen, argon, etc. [20][21][22] However, to the best of our knowledge, no research has been carried out that could demonstrate a comparative study of sintering of boehmite coatings in inert and oxygen atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Atmosphere on the Corrosion and Wear Resistance of Sol-Gel Alumina-Coated Mild Steel Surface

2009

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Sol-gel boehmite coating has been applied on mild steel substrate and sintered in inert (nitrogen) and oxygen atmospheres at 400°C to obtain a crack-free and dense alumina coating. Thereafter, its corrosion and wear resistance properties were evaluated under different exposure conditions. Fourier transform infrared (FTIR) analysis of the boehmite gel sintered in the above-mentioned atmospheres identified the presence of residual organic precursors in the gel. Microstructure and phase analyses of the sol-gel-coated surfaces were carried out using scanning electron microscopy (SEM) and x-ray diffraction (XRD) analyses, respectively. XRD analysis confirms the presence of alumina phase on the sol-gel-coated surfaces. Traces of organic groups in the gel sintered at 400°C in both of the atmospheres were noticed by FTIR analysis. Solgel-coated specimens sintered in a nitrogen atmosphere have shown a somewhat better corrosion resistance in 3.5% sodium chloride (NaCl) as compared to specimens sintered in an oxygen atmosphere. Similarly, an improved wear resistance was measured for the sol-gel-coated specimens sintered in the nitrogen atmosphere.

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Microstructure of sol–gel derived corundum containing coatings

Cited by 9 publications

References 30 publications

Alumina Thin Films

Alumina Thin Films

In-Vitro Bioactivity Investigation of Sol-Gel Derived Alumina-Bovine Hydroxyapatite (BHA) Composite Powders

Effect of Sintering Atmosphere on the Corrosion and Wear Resistance of Sol-Gel Alumina-Coated Mild Steel Surface

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