scholarly journals Development of Silane-Based Coatings with Zirconia Nanoparticles Combining Wetting, Tribological, and Aesthetical Properties

Coatings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 368 ◽  
Author(s):  
Sara Lopez de Armentia ◽  
Mariola Pantoja ◽  
Juana Abenojar ◽  
Miguel Martinez

Silane-based coatings with nanoparticles have been widely used in applications related to surface protection. Between them, the improvement of corrosion resistance by increasing the hydrophobicity is one of the main research goals. However, most coatings present problems of low wear resistance and poor aesthetic appearance. Therefore, the overall goal of this research is to manufacture hydrophobic sol-gel coatings based on silanes which comply with good tribological and aesthetical properties. In the present study, stainless steel plates were coated with a silane-based solution containing zirconia nanoparticles by dip coating. Water–ethanol solutions with silanes (methyltrimethoxysilane (MTS) and tetrathoxysilane (TEOS)) and different percentages of ZrO2 nanoparticles were prepared. Gloss, color, contact angle, surface energy, wear resistance, and thickness of coating were analyzed to elucidate the effect of zirconium oxide on the performance of the coatings. Results demonstrate that the ZrO2–silane coatings on stainless steel offer a balanced combination of properties: low wettability, high wear resistance, and similar color and brightness compared to pristine stainless steel.

2009 ◽  
Vol 255 (20) ◽  
pp. 8328-8333 ◽  
Author(s):  
N. Barati ◽  
M.A. Faghihi Sani ◽  
H. Ghasemi ◽  
Z. Sadeghian ◽  
S.M.M. Mirhoseini

2002 ◽  
Vol 734 ◽  
Author(s):  
Kanji Tsuru ◽  
Shinji Takemoto ◽  
Tatsuhiro Yamamoto ◽  
Satoshi Hayakawa ◽  
Akiyoshi Osaka ◽  
...  

ABSTRACTWe examined blood compatibility of titanium oxide layer on stainless-steel (SUS316L). The oxide layers with varied thickness were yielded on SUS316L plates by dip-coating of sol-gel solution starting from tetraethyltitanate. The blood compatibility was evaluated in term of platelet adhesion using platelet rich plasma. With increase in the thickness of the oxide layer, the number of adherent platelets decreased rapidly, reached minimum around 150nm. This indicated that the thickness of titanium oxide layer affected platelet adhesion.


2007 ◽  
Vol 336-338 ◽  
pp. 2649-2651 ◽  
Author(s):  
Xin Gang Yu ◽  
Lan Yun Liu ◽  
Yan Bin Zuo ◽  
Lin Jiang Wang ◽  
Hong Wen Ma ◽  
...  

X-ray diffraction (XRD) method to measure the residual stress existing in the metal substrate surface layer was introduced and the sol-gel ZrO2-CeO2 thin film was successfully prepared on SUS304 stainless steel substrate by dip-coating process. The macro residual stress existing in metal substrate was analyzed by XRD. It turns out that the compressive stress existing in the metal substrate surface layer increases with the increase of heat-treated temperature. Based on the above study, colored stainless steels of high quality were prepared by sol-gel process.


2018 ◽  
Vol 9 (2) ◽  
pp. 69
Author(s):  
Widodo W Purwanto ◽  
Yuswan Muharam ◽  
Dwi Yulianti

Methane decomposition is an alternative way to produce high quality carbon nanotubes (CNTs) and hydrogen simultaneously. The use of gauze reactor for methane decomposition had proven in solving pressure drop problem in fixed bed reactor. This experiment was carried out to study the effects of operation conditions (space time, temperature, and feed ratio) to gauze rector performance. Ni-Cu-Al catalyst which is prepared by sol-gel method with atomic ratio 2:1:1, was coated to Stainless Steel gauze by dip coating method. The reaction was done by flowing methane into the reactor at atmospheric pressure and varying space time (0.0006; 0.0032; 0.006 g×kat×min/mL), temperature (700, 750, and 800°C), and feed ratio CH4:H2 (1:0, 4:1, 1:1). An online gas chromatograph is used to detect the gas products. Reactor performances were observed from methane conversion, hydrogen purity, carbon yield and quality of nanocarbon that have been produced. Experiment result showed that the highest reactor performance (except nanocarbon quality) occurred at space time 0.006 gr cat min/mL, temperature 700 °C, and with pure methane as feed which give methane conversion, hydrogen purity, and yield carbon results are 90.66%, 90.16%, and 37 g carbon/g catalyt, respectively. Based on SEM analysis indicated that the best nanocarbon morphology can be gained at CH4:H2 ratio of 1:1.Keyword : methane decompotition, gauze reactor, carbon nanotube Abstrak Dekomposisi katalitik metana adalah salah satu alternatif untuk memproduksi hidrogen dan nanokarbon bermutu tinggi secara simultan. Penggunaan reaktor gauze untuk dekomposisi metana terbukti dapat mengatasi permasalahan penyumbatan pada reaktor unggun diam. Penelitian ini dilakukan untuk mengetahui pengaruh kondisi operasi (space time, temperatur, dan rasio umpan) terhadap kinerja reaktor gauze. Katalis Ni-Cu-Al disiapkan dengan menggunakan metode sol-gel dengan perbandingan atomik 2:1:1 dilapiskan pada gauze Stainless Steel dengan metode dip-coating. Reaksi dilakukan dengan mengalirkan metana ke dalam reaktor pada tekanan atmosferik dan dengan memvariasikan space time (0,0006; 0,0032; 0,006 g×kat×min/mL), temperatur (700, 750, dan 800 °C), dan rasio umpan CH4:H2 (1:0, 4:1, 1:1). Produk gas dianalisis dengan menggunakan gas chromatography yang terpasang secara online. Kinerja reaktor pada penelitian ini ditinjau dari konversi metana, kemurnian hidrogen, perolehan dan kualitas nanokarbon yang dihasilkan. Berdasarkan hasil eksperimen diketahui bahwa kinerja reaktor paling tinggi (kecuali kualitas nanokarbon) terjadi pada space time 0,006 g×kat×min/mL, temperatur 700 °C, dan dengan menggunakan metana murni yang memberikan hasil konversi metana, kemurnian hidrogen, serta perolehan karbon secara berturut-turut 90,66%, 90,16%, dan 37 gram karbon/gram katalis. Hasil analisis menggunakan SEM menunjukkan bahwa morfologi nanokarbon paling baik didapat pada komposisi reaktan CH4: H2 = 1:1.Kata Kunci : dekomposisi metana, reaktor gauze, karbon nanotube


Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 988
Author(s):  
Lidija Ćurković ◽  
Helena Otmačić Ćurković ◽  
Irena Žmak ◽  
Mihone Kerolli Mustafa ◽  
Ivana Gabelica

In this work, a single-layer TiO2–ZrO2 thin film is deposited on the AISI 316L austenitic stainless steel by the sol–gel process and the dip coating method to improve its corrosion resistance properties. For the sol preparation, titanium isopropoxide and zirconium butoxide are used as the precursors, yttrium acetate hydrate is used for the ZrO2 stabilization, i-propanol as the solvent, nitric acid as the catalyst, acetylacetone as the chelating agent, and the distilled water for the hydrolysis. The deposited films are annealed at 400 °C or 600 °C. Morphology and phase composition of the sol–gel TiO2–ZrO2 films and powders are analyzed by scanning electron microscopy (SEM) equipped with EDX detector and X-ray diffraction (XRD), respectively. The thickness of the sol–gel TiO2–ZrO2 films deposited on the stainless steel is determined by glow discharge optical emission spectrometry (GD-OES). The corrosion behavior of the stainless steel, coated by amorphous films, is evaluated in 3 wt% NaCl and 0.5 mol dm−3 HCl by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. It is found that the sol–gel TiO2–ZrO2 films with the amorphous structure, deposited by the sol–gel process, and calcined at 400 °C significantly enhance the corrosion properties of AISI 316L in both chloride media.


2007 ◽  
Vol 280-283 ◽  
pp. 815-818 ◽  
Author(s):  
Xin Gang Yu ◽  
Yanbin Zuo ◽  
Hong Wen Ma ◽  
Hui Feng Zhao ◽  
Wu Wen Luo ◽  
...  

X-ray diffraction (XRD) method to measure the residual stress in the metal substrate surface layer and the medial oxide layer between thin film and metal substrate was introduced and the sol-gel TiO2-SiO2 thin film was successfully prepared on SUS304 stainless steel substrate by dip-coating process. The macro residual stress existing in metal substrate was analyzed by XRD. It turns out that the compressive stress existing in the metal substrate surface layer decreases with the raising of heat-treated temperature and that the compressive stress of metal substrate surface layer and the tensile stress of the medial oxide layer increase with the increase of the withdrawal speeds of the sol-gel dip-coating. Based on the above study, colored stainless steels of high quality were prepared by sol-gel process for the first time.


2017 ◽  
Vol 30 (2) ◽  
pp. 14-20
Author(s):  
Iván Villarreal ◽  
Miguel Aldás ◽  
Victor Hugo Guerrero-Barragan ◽  
Nelly María Rosas-Laverde ◽  
Alexis Debut

In this work, we studied the anticorrosive properties of sol-gel nanostructured calcium stabilized zirconia coatings, deposited onto 304 stainless steel and commercial aluminum substrates by dip-coating and spin-coating. During the ceramic oxide synthesis, zirconium oxychloride octahydrate was used as precursor and calcium acetate monohydrate was used as stabilizer of the cubic zirconia structure, in a precursor/stabilizer molar ratio of 0.84/0.16. The gel films deposited on steel and aluminum were heat treated at 550 y 600 °C during 5 and 10 min, respectively, and the adherence of the resulting ceramic films was evaluated. Continuous coatings were obtained that reached average thicknesses between 2 y 3 mm when deposited on stainless steel, and between 1.5 y 1.6 on aluminum, depending on the coating method. The corrosion resistance of the best-adhered coatings was evaluated during 500 h in a saline chamber, according to ASTM B117-11. All the substrate-coating combinations showed a very good corrosion resistance. For the two substrate types, the films deposited by dip-coating showed higher corrosion resistance than the ones deposited by spin-coating. The anticorrosive protective effect of the coatings was better for the aluminum substrates, compared to the stainless-steel substrates.


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