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Artykuły w czasopismach na temat "TI02 COMPOSITE"
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Shi, Dan, Zhi Li Zhang, De Cai Li, Qi Han i Tie Peng Xing. "Preparation and Photo-Catalysis Properties of Fe3O4/TiO2 Nanocomposite". Key Engineering Materials 512-515 (czerwiec 2012): 187–90. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.187.
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As a Kind of Most Common Used Photocatalyst, TiO2 Nanomaterials Existing Disadvantages on Low Light Energy Utilization in Visible Light Range and Difficulty on Recycle. in Our Study, Different Proportions of Fe3+ and Fe2+ Ion Were Doped with Nano-Ti02 Particles in Structure of Rutile Type through Method of Chemical Precipitation. the Result Showed that Nano-Composites Formed by TiO2 Coexist with Fe3O4, with the Average Size of the Composite Particles Nearly 20 Nm. the Photo-Catalyst Performances of the Composite Have Improved Largely, and so the Relatively Optimized Preparation Conditions Were Presented.
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Hui, Yang, Zhang Jiaqi i He Huan. "Preparation of carbon nanotubes/TiO2-polyvinylidene fluoride nanocomposites and composite films". Journal of Physics: Conference Series 2263, nr 1 (1.04.2022): 012001. http://dx.doi.org/10.1088/1742-6596/2263/1/012001.
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Abstract In this paper, PVDF membrane was discussed, many modified materials were found from the shortage of materials, and finally carbon nanotubes/TiO2 hybrid materials were synthesized. The preparation methods and synthesis conditions of carbon nanotubes/TiO2-polyvinylidene fluoride nano composite ultrafiltration membrane were studied, and the advanced membrane treatment technology was prospected. Secondly, multi-walled carbon nanotubes/Ti02 hybrid materials were synthesized by hydrothermal method and sol-gel method.
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Svec, Pavol, i L’ubomír Caplovic. "Microstructure and mechanical properties of b4c-tib2 composites reactive sintered from B4C + TiO2 precursors". Processing and Application of Ceramics 16, nr 4 (2022): 358–66. http://dx.doi.org/10.2298/pac2204358s.
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Ceramic composites consisting of a boron carbide (B4C) matrix and titanium diboride (TiB2) secondary phase were obtained by reactive sintering from boron carbide powder with 40 and 50wt.% of titanium dioxide (TiO2) additive. The same sintering temperature of 1850?C and pressure of 35MPa, but different sintering times from 15 to 60min, were applied during reactive hot pressing of the composites in vacuum. The effects of TiO2 content and sintering time on phase compositions, microstructures and mechanical properties of the composites were studied. The TiO2 additive enhanced densification of the B4C-TiB2 ceramic composites. Both Vickers hardness and the fracture toughness of the composites increased with prolongation of sintering time. The highest hardness of 29.8GPa was achieved for the composite with 29.6 vol.% of TiB2 obtained by sintering of the precursor with 40wt.% of TiO2 additive for 60min. The fracture toughness reached a maximum value of 7.5MPa?m1/2 for the composite containing 40.2 vol.% of TiB2, which was fabricated by reactive sintering of the precursor with 50wt.% of TiO2 additive for 60min.
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Wang, Gui Song, i Lin Geng. "Microstructure Formation Mechanism of (Al2O3+TiB2+Al3Ti)/Al Composites Fabricated by Reactive Hot Pressing". Key Engineering Materials 353-358 (wrzesień 2007): 1439–42. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1439.
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The two (Al2O3+TiB2+Al3Ti)/Al composites were fabricated from Al-B2O3-TiO2 and Al-B-TiO2 raw powders by reactive hot pressing, respectively. The microstructure of in situ two composites was analyzed by OM, SEM and TEM. The results showed that coarse Al3Ti blocks with several tens of micrometers size were formed during hot pressing. The equiaxed Al2O3 particulates and hexagonal TiB2 particulates with finer sizes were formed in the composites simultaneously. The microstructure formation mechanism of (Al2O3+TiB2+Al3Ti)/Al composites were discussed. The results showed that Al2O3 reinforcements were formed on the surface of TiO2 or B2O3 powder and TiB2 particles were formed on B or B2O3 powders. The formation of coarse Al3Ti block is result from continuous diffusion of Ti in liquid Al during reactive hot pressing. In addition, there are fine Al3Ti precipitates exist in the composite fabricated from Al-B-TiO2 powders. This contributes to the improved mechanical properties in terms of yield and ultimate stresses and Young’s modulus of the composite.
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Kustiningsih, Indar, Fajariswaan Nurrahman, Hasby Ashyra Rinaldi, Ipah Ema Jumiati, Denni Kartika Sari i Jayanudin Jayanudin. "Synthesize Fe<sub>3</sub>O<sub>4</sub>-TiO<sub>2 </sub>Composite for Methyl Orange Photocatalytic Degradation". Materials Science Forum 1057 (31.03.2022): 129–35. http://dx.doi.org/10.4028/p-9q4ts9.
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The effect of Fe3O4 percentage on Fe3O4-TiO2 composite for methyl orange photocatalytic degradation has been investigated. Hydrothermal was carried out on TiO2 before being combined with Fe3O4 by precipitation method. The composites were characterized by means of Scanning Electron Microscope (SEM), X-ray diffraction (XRD) and UV-Vis diffuse and reflectance spectroscopy (UV-Vis DRS). The photocatalytic activity of Fe3O4-TiO2 composites were evaluated for methyl orange degradation. The addition of Fe3O4 to TiO2 could reduce the bandgap energy. The lowest bandgap energy was obtained at 20% Fe3O4-TiO2 composite. By using this composited, the degradation of methyl orange was 90%.
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Noviyanti, Atiek Rostika, Efa Nur Asyiah, Muhamad Diki Permana, Dina Dwiyanti, Suryana i Diana Rakhmawaty Eddy. "Preparation of Hydroxyapatite-Titanium Dioxide Composite from Eggshell by Hydrothermal Method: Characterization and Antibacterial Activity". Crystals 12, nr 11 (10.11.2022): 1599. http://dx.doi.org/10.3390/cryst12111599.
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Hydroxyapatite (HA) has been widely used in biomedical applications. HA is prepared from natural sources of eggshell. The obtained HA is composited with TiO2 using the hydrothermal method at a temperature of 230 °C. The structure and morphology of HA-TiO2 composites are characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and a scanning electron microscope (SEM). Meanwhile, its antibacterial activity was tested on Staphylococcus aureus and Escherichia coli bacteria. The formation of the HA-TiO2 composite is evidenced by typical peaks on the XRD pattern for HA and TiO2. The FTIR spectrum shows that no bond formed between TiO2 and HA which indicates the formation of composites. The smallest crystallite size and the highest specific surface area were obtained from the composite with the composition of HA-TiO2 30:70. In addition, the composition of the composite also shows the smallest particle size distribution. Therefore, the presence of TiO2 plays a significant role in determining the HA properties formed. Furthermore, the HA-TiO2 composite showed good antibacterial activity using disk diffusion and optical density (OD) methods. These results indicate that the synergistic combination of HA from eggshell with TiO2 has favorable properties for antibacterial activity.
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Niyomwas, Sutham. "Synthesis of TiO2-B2O3-Al Based Porous Composites". Advanced Materials Research 626 (grudzień 2012): 1–5. http://dx.doi.org/10.4028/www.scientific.net/amr.626.1.
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The TiB2-Al2O3 porous composites were obtained in situ by self-propagating high temperature synthesis (SHS) of TiO2-B2O3-Al System. The reaction was carried out in a SHS reactor under static argon gas at the pressure of 0.5 MPa. The standard Gibbs energy minimization method was used to calculate the equilibrium composition of the reacting species. The effects of increasing aluminum mole ratio to the precursor mixture of TiO2, B2O3 and Al were investigated. XRD and SEM analyses indicate complete reaction of precursors to yield TiB2-Al2O3 as product composite
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Yeh, Chun-Liang, i Fu-You Zheng. "Formation of TiB2–MgAl2O4 Composites by SHS Metallurgy". Materials 16, nr 4 (15.02.2023): 1615. http://dx.doi.org/10.3390/ma16041615.
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TiB2–MgAl2O4 composites were fabricated by combustion synthesis involving metallothermic reduction reactions. Thermite reagents contained Al and Mg as dual reductants and TiO2 or B2O3 as the oxidant. The reactant mixtures also comprised elemental Ti and boron, as well as a small amount of Al2O3 or MgO to serve as the combustion moderator. Four reaction systems were conducted and all of them were exothermic enough to proceed in the mode of self-propagating high-temperature synthesis (SHS). The reaction based on B2O3/Al/Mg thermite and diluted with MgO was the most exothermic, while that containing TiO2/Al/Mg thermite and Al2O3 as the diluent was the least. Depending on different thermites and diluents, the combustion front temperatures in a range from 1320 to 1720 °C, and combustion wave velocity from 3.9 to 5.7 mm/s were measured. The XRD spectra confirmed in situ formation of TiB2 and MgAl2O4. It is believed that MgAl2O4 was synthesized through a combination reaction between Al2O3 and MgO, both of which can be totally or partially produced from the metallothermic reduction of B2O3 or TiO2. The microstructure of the TiB2–MgAl2O4 composite exhibited fine TiB2 crystals surrounded by large densified MgAl2O4 grains. This study demonstrated an energy-saving and efficient route for fabricating MgAl2O4-containing composites.
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da Rocha, Rosa Maria, i Francisco Cristóvão Lourenço de Melo. "Effect of TiO2 and TiB2 on Pressureless Sintering of B4C". Materials Science Forum 727-728 (sierpień 2012): 1022–27. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1022.
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This paper presents results of experiments on pressureless sintering of boron carbide (B4C) with addition of titânia (TiO2) and titanium diboride (TiB2). The TiB2powder was added as a second phase and the TiO2powder for reactive sintering and in-situ formation of TiB2. The final concentrations of TiB2in the composites were 0 to 10 vol%. Sintering was performed at 2050 °C/30min in argon atmosphere. TiO2was completely transformed into TiB2with fine equiaxed grains distributed homogeneously. Composites obtained by in-situ reaction showed a densification increase with the concentration increase, while the composites with TiB2powder mixture showed low densification in all compositions. Relative Density of the composite with 10 vol% of TiB2obtained in-situ was 91% (TD) compared to 86 % for B4C only. Vickers hardness was about 29 GPa.
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Li, Shaolin, Xiuhua Guo, Shengli Zhang, Jiang Feng, Kexing Song i Shuhua Liang. "Arc erosion behavior of TiB2/Cu composites with single-scale and dual-scale TiB2 particles". Nanotechnology Reviews 8, nr 1 (31.12.2019): 619–27. http://dx.doi.org/10.1515/ntrev-2019-0054.
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AbstractArc erosion behaviors of TiB2/Cu composites with single-scale and dual-scale TiB2 particles fabricated by powder metallurgy were studied. It was revealed that the dual-scale TiB2/Cu composites had fewer structure defects compared with the single-scale TiB2/Cu composites, and TiB2 particles with different size were uniformly distributed in the copper matrix. When the ratio of 2 μm over 50 μm TiB2 particles is 1:2, the density of TiB2/Cu composite is 98.5% and shows best mechanical and thermal properties. The arc duration and energy of TiB2/Cu composites increase with the increase of electric current in contact material testing. Compared with the single-scale TiB2/Cu composites, the arc erosion of dual-scale TiB2/Cu composite with 2 μm+50 μm (1:2) TiB2 was slighter. The anode bulge area and cathode erosion pit of dual-scale TiB2/Cu composite was smaller. The dual-scale TiB2 particles optimize the microstructure and thermal stability of the composite, which is conducive to alleviating arc erosion. The synergistic effect of different sized TiB2 particles in the matrix improved the arc erosion resistance of TiB2/Cu composite during arcing.
Rozprawy doktorskie na temat "TI02 COMPOSITE"
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Vukicevic, Uros. "TiO2 nanorod polymer composite materials". Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/7669.
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The remarkable characteristics of Ti02 are widely used, from everyday life applications (pigments, food/cosmetics additives) to more specialised systems, including photovoltaics and structural composites. Use in polymers is substantial (25% of all Ti02 produced), but most applications and research focus on commercial powders. A new generation of Ti02 nanoparticles has emerged, based on very small, single-crystals, with well-defined morphology and phase. A limited number of papers report the use of this new nanoscale Ti02 in polymer nanocomposites, and indicate improved properties. Although the synthesis of anisotropic nanoparticles (e. g. nanorods) has been well-reported, use in polymer nanocomposites remains largely unreported. This thesis broadly covers three topics: (1) synthesis of Ti02 nanorods using different sol-gel routes in presence of structure directing agents, (2) modification of the nanorod surface chemistry in order to control dispersion and surface properties and (3) fabrication of titania nanorod-polymer composites. Singlecrystal anatase nanorods were produced with variable aspect ratio (3-12), depending on the specific structure directing agent (SDA) used during synthesis. Due to organic functionalisation at the nanorod surface, nanorods could be well dispersed in chloroform. A new procedure, based on the self-cleaning ability of Ti02 under UV, was developed for removal of organics from the nanorod surface, without compromising the nanorod morphology, crystallinity or dispersibility. This powerful tool can be used to change the surface character of the nanorods to generate aqueous TNR dispersions. Stable dispersions were achieved using quaternary ammonium hydroxides to modify the surface electrostatically and sterically. Once dispersed individually, the surface can be further modified by sol-gel chemistry. Composite work involved blending both organic and water-soluble polymers with nanorod dispersions in chloroform and water, respectively, to produce composite films of exceptional optical transparency, even for nanorod loadings up to 30 wt%. The films possess very strong, wavelength-tuneable UV absorbance, which could be used in UV filters and optical limiting. The presence of SDAs or dispersants at the nanorodpolymer interface hinders strong adhesion, as evidenced by marginally lower tensile strength and thermal stability of the nanocomposites. The photo-stability of the nanorod composites is comparable to that of the pure polymer and better than that of composites with commercial equiaxed TiO2 nanoparticles.
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Steele, Karl Christopher. "Evaluation of TiO2 and Ag-TiO2, CuO-TiO2 composite films for self-disinfection activity". Thesis, University of Salford, 2009. http://usir.salford.ac.uk/26923/.
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The removal or killing of microorganisms on surfaces is of concern in the health care setting, food preparation areas and general work environment. The use of TiO2 photosterilisation has been proposed as an alternative to chemical disinfection of surfaces as a means to reduce the need for increasingly concentrated and aggressive chemicals necessary to kill disinfectant-resistant organisms. The objective of this research was to evaluate the ability of photocatalytic oxidation to reduce bacterial and viral contaminants on surfaces coated with TiOa and Ag-TiC^, TiO2-Ag, Cu-TiC^, TiO2-Cu. There are no British Standards that cover evaluation of such surfaces. A method for evaluation of photocatalytic surfaces was therefore developed from BS EN 13697:2001 and used to evaluate the activities of a variety of catalytic surfaces coated with TiO2, Ag and Cu and multi-layers of Ag-TiO2,TiO2-Ag, Cu-TiO2,TiO2-Cu. The antimicrobial activities were found to be dependent on the nature of the coating. Highest killing activities were obtained with Ag and Cu alone but combinations of Ag or Cu with TiO2were more active than TiO2 alone and also retained some self- cleaning activity. The results showed that the developed method was adaptable for determination of the antimicrobial activity of coatings with a wide range of activities producing 100% killing of Escherichia coll in times from 3 min up to 4 h. The results showed that it was possible to produce self cleaning self disinfecting surfaces and that surfaces with TiO2 on top, although having reduced activity compared to Ag or Cu, were durable and may have applications in the prevention of transmission of infections on surfaces in a wide range of applications.
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Paušová, Šárka. "Elaboration de matériaux composites photocatalytiquement actifs pour des applications environnementales". Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22475/document.
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Ce travail décrit la synthèse et le comportement de nouveaux photocatalyseurs à base de dioxyde de titane utilisés pour des applications environnementales. Dans la première partie, la pertinence des composés modèles testés, le colorant acide orange 7 (AO7) et le 4-Chlorophénol (4-CP), pour des traitements photocatalytiques à base de TiO2 a été étudiée et validée. Cette étude a été centrée sur l’effet de la concentration initiale en composé et sur la vitesse d’agitation pendant la réaction photocatalytique. La deuxième partie est consacrée principalement à la synthèse et la caractérisation des suspensions de particules colloïdales de TiO2. Leur séparation puis leur récupération après le traitement étant pratiquement impossible l’immobilisation de ces particules sur des supports de type hydroxydes doubles lamellaires (HDL) a été étudiée afin de préparer un matériau composite TiO2/HDL présentant une activité photocatalytique comparable à celle du dioxyde de titane pur. Un deuxième type de composite basé sur des mélanges de TiO2/SiO2 a également été envisagé et utilisé dans la préparation de fines couches efficaces pour la photodégradation de l’hexane. Enfin, le comportement photocatalytique d’HDL pur à base de zinc et de chrome, sans addition de TiO2, a également été étudié et est présenté dans la partie finale de cette thèse. Les matériaux préparés ont été caractérisés par différentes analyses chimiques, diffraction et fluorescence des rayons X, microscopie électronique à transmission et à balayage, spectroscopie IR à transformé de Fourier, analyse thermogravimétrique, mesure du potentiel Zeta, diffusion de la lumière, mesure d’adsorption N2. Les différents matériaux ont été testés photocatalytiquement via la photo-Oxydation en solution aqueuse de l’acide orange 7 (AO7), du 4-Chlorophénol (4-CP) ou du bleu de méthylène à différents pH. L’activité photocatalytique du matériau composite à base de TiO2/SiO2 sous forme de film fin a été évaluée en phase gaz en présence d’hexaneThis work describes the behaviour and fabrication of new photocatalysts based on titaniumdioxide for the purpose of environmental applications. It consists of five closely connectedparts. In the first part the suitability of chosen model compounds, azo dye Acid Orange 7(AO7) and 4-Chlorophenol (4-CP), for photocatalytic activity assessment of TiO2 was studied.This study was focused on the effect of different initial concentrations of model compoundand different rates of stirring during photocatalytic reaction. The second part then focusedmainly on the synthesis and characterization of aqueous colloidal suspensions of TiO2. Theseparation of TiO2 particles in the form of colloidal suspensions and their regeneration afterthe reaction, while keeping the same photocatalytic properties, is almost not possible.Therefore, it was necessary to find an appropriate method how to immobilize these particleson the support or in the form of composite. The layered double hydroxides (LDH) werechosen as one of suitable supports for TiO2 photocatalyst. The focus was kept on thepreparation of TiO2/LDH composites with the same or higher photocatalytic activity as purecolloidal titanium dioxide. The second chosen type of composite was based on twocomponentTiO2/SiO2 material and these composites were used for the preparation of thinlayers. Photocatalytic behaviour of pure LDHs and their possible use as photocatalyst withoutTiO2 addition was also studied and described in a final part of this work. Prepared materials were characterized by chemical analysis, X-Ray diffraction andflorescence, transmition electron microscopy, scanning electron microscopy, Fouriertransform infrared spectroscopy, thermogravimetric analysis, dynamic light scattering, zetapotential measurement and N2 adsorption. As another step, materials were tested asphotocatalyst by the photooxidation of Acid Orange 7, 4-Chlorophenol and Methylene Blue indifferent pH in aqueous medium. Photocatalytic activity of TiO2/SiO2 composites in the formof thin films was tested in gaseous phase using hexane as a model pollutant. It was found that quantum yields of 4-CP degradation for all prepared alkaline colloidalsuspensions of TiO2 were lower than those obtained for acidic TiO2 colloidal suspensions. Inthe contrary to the quantum yield of acidic TiO2, the quantum yield of alkaline suspensionsdecreased during the aging. Prepared TiO2/Mg2Al1.5 nanocomposites exhibited higherphotocatalytic activity than the original TiO2 in basic conditions and also it was much easierto recover the photocatalyst after reaction by simple sedimentation. In the case of TiO2/SiO2composites, it was found that composite prepared with TiO2:SiO2 ratio 1:1 has higherphotocatalytic activity in aqueous media than starting pure TiO2 but with increasing SiO2content reaction rate of AO7 degradation decreases. Thin layers of TiO2:SiO2 compositeprepared from simultaneously co-Precipitated particles (they have improved crystallinity inrelation to pure TiO2) are able to photocatalyticaly degrade hexane. In the case of pure LDH,it was proved that even noncalcined Zn2CrCO3 LDH can produce HO• radicals. However,mixed oxides (containing ZnO) prepared by LDH calcination at temperatures higher than500°C, showed higher efficiency
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Fan, Ka Ho. "Synthesis and evaluation of macroporous TiO2 composite photocatalyst /". View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CENG%202006%20FAN.
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Ishchenko, Olga. "Elaboration of plasmonic nano-composites and study of their specific catalytic activities". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF042/document.
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L’objective est d’améliorer l’activité photocatalytique de TiO2 sous irradiations UV et Visible. Pour contourner les limites de TiO2 intrinsèque nous envisageons une fabrication de nanocomposite plasmonique à base de nanofils de TiO2 périodiquement organisés et assemblés avec des nanoparticules plasmoniques. Pour la fabrication des nanofils de TiO2 mécaniquement stables, deux approches ont été réalisées. La première approche est basée sur la croissance sélective en phase vapeur, la deuxième approche consiste en l’utilisation d’un moule de membranes AAO et d’un dépôt de films conformes par ALD. En parallèle les films de TiO2déposés par ALD sont assemblés avec les nanoparticules plasmoniques d’or. Les différentes architectures de TiO2 sont valorisées par des tests photocatalytiques (UV et Visible) sur les polluants modèles. Une nouvelle approche de la fabrication des films mesoporeux d’H-TiO2 avec efficacité photocatalytique à la fois sous irradiation UV et Visible est développéeThe objective of this thesis is to improve the photo-response of well-known photocatalytic material such as TiO2, which is usually only active in the UV range. The basic idea is to assemble several approaches within one device to improve the photocatalytic properties: fabrication of periodically-organised TiO2 nanostructures and their assembly with plasmonic nanoparticles. Two fabrication strategies were investigated for these purposes. The first approach consists of selective vapour phase growth. The second approach implements the use of an AAO template. In parallel, TiO2 films deposited by ALD and assembled with plasmonic gold nanoparticles are investigated. The photocatalytic measurements on various TiO2 architectures were performed in both irradiation ranges UV and Vis. A new fabrication approach of mesoporous H-TiO2 films was developed giving promising results of photocatalytic efficiency improvement in both UV and Visible ranges
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Dan, Chengyi. "Effects of nanoparticles on the microstructure and crystallographic texture evolution of two Aluminium-based alloys". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS147.
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Les effets des nanoparticules (cisaillables et non-cisaillables) sur l’évolution microstructurale et l'évolution de la texture cristallographique des deux alliages à base d’aluminium après laminage à froid ont été étudiés dans cette thèse. Un alliage Al-Sc contenant des nanoparticules cisaillables de Al3Sc et un composite Al-TiB2 contenant des nanoparticules non-cisaillables TiB2 sont étudiés. La microscopie électronique en transmission (MET), la diffraction d'électrons rétrodiffusés (EBSD) et l’analyse de la texture par la diffraction de neutrons sont utilisées pour caractériser le développement de la microstructure et la texture cristallographique lors du laminage à froid des 2 alliages.La restauration dynamique pendant laminage a été inhibée dans la matrice contenant des Al3Sc nanoparticules cisaillables et TiB2 non-cisaillables. Par conséquent, peu de cellules de dislocation ont été générées dans la matrice, ce qui limite la diminution de la taille des grains.Le développement de la texture de laminage est retardé par les nanoparticules cisaillables ou les particules non-cisaillables. Des bandes d’orientation de cube résiduelles se trouvent dans les matériaux contenant des particules cisaillables dans une matrice très déformée en raison de la limitation du glissement croisé. La réduction de la proption volumique des composantes de texture du laminage se produit dans les matériaux contenant de grandes particules non-cisaillables (de l’ordre d’un micromètre) en raison de la recristallisation dans les PDZs (Particle Deformation Zones), ce qui contribue également à la diminution des grains.De plus, le cisaillement de nanoparticules favorise le glissades en plan, ce qui conduit à une forte localisation des déformations et à l'apparition de bandes de cisaillement. La génération de bandes de cisaillement dépend de l'orientation et est dû au changement soudain des chemins de déformation et et de l'inhibition de la récupération dynamique. Les nanoparticules non cisaillables ont probablement pivoté avec la matrice environnante, ce qui pourrait constituer un nouveau mécanisme de déformationThe effects of shearable and non-shearable nanoparticles on the microstructure and crystallographic texture evolution of two Al-based alloys after cold rolling have been studied in this thesis. An Al-Sc alloy containing shearable Al3Sc nanoprecipitates and Al-TiB2 composite containing non-shearable TiB2 nanoparticles are investigated, respectively. Transmission electron microscopy (TEM), electron backscatter diffraction (EBSD) and neutron diffraction texture analysis are employed to characterize the microstructure and texture development of the two alloys during cold rolling.Dynamic recovery has been inhibited in the matrix containing both shearable (Al3Sc) and non-shearable (TiB2) nanoparticles due to the pinning effects. Hence, few dislocation cells are generated in these matrices that impedes the grain refinement.The development of rolling texture is retarded by either shearable nanoprecipitates or non-shearbale particles. Obvious residual Cube orientation bands are found in materials containing shearable precipitates at the deformed states due to the limitation of cross-slip. Volume reduction of rolling texture components occurs in materials containing large non-shearable particles (about 1 micrometer) due to the recrystallization at PDZs (Particle Deformation Zones), which contributes to grain refinement.In addition, the shearing of nanoprecipitates promotes planar slip leading to strong strain localization and the occurrence of shearbands. The generation of shearbands is orientation dependent and results from the sudden change of deformation paths and inhibition of dynamic recovery. The non-shearable nanoparticles probably have rotated together with the surrounding matrix, which could be a new deformation mechanism
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Salomatina, Y. V., L. A. Smirnova, A. V. Markin, A. P. Aleksandrov i N. M. Bityurin. "Preparation and properties of hibryd organic-inorganic composites baced on poly-Ti02". Thesis, Sumy State University, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20593.
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Optically transparent hybrid organic-inorganic copolymers based on the poly-
TiO2, vinyl monomers and lactide or glycolide have been prepared. Optical and physi-
cal-mechanical properties of composites are depended with the ratio of components have
shown. Hybrid copolymers possess photochromic properties. By the UV light excitation
reversible darkening of the samples due to the transition Ti
4+
ļ Ti
3+
had observed. The
speed of transition depends on the copolymer composition.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20593
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Joshi, Sharmad Vinod. "Characterization of 3D printed metal oxide composite polymers". Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595511295182678.
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Jones, Alan Hywel. "Synthesis and tribology of Sialon/TiB2 ceramic composites". Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/56017/.
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The inclusion of TiB2 particles in a Si3N4 or sialon matrix has the potential to improve the materials properties over those of the Si3N4 alone. The combination of the excellent properties of sialon and the high hardness of the TiB2 makes these materials potentially suitable for tribological applications. This research has investigated the use of chemical reactions that can take place during sintering to synthesise TiB2 from TiN and BN. The reactions not only produce TiB2 but simultaneously synthesise the matrix material. The sialon matrix is used as a flexible receptor for excess nitrogen and oxygen. Using such reactions, sialonlTiB 2 composites were successfully produced by both hot pressing and pressureless sintering. It was shown that these materials achieve densities close to the theoretical and contain only the required phases of TiB2 and ~ sialon. Pressureless sintered materials also contain residual sintering aid as an intergranular phase. The composites wee characterised with respect to their microstructure, hardness, fracture toughness and tribological properties. A specially designed wear test apparatus was constructed for the tribological testing. The pin-on-disc apparatus was capable of testing the small volumes of material (minimum diameter of disc ~ 15mm) typically produced at the development stage. The materials were found to have high hardness and reasonable fracture toughness which was attributed primarily to the properties of the matrix phase with some possible toughening from the presence of TiB 2 . Tribological testing revealed high dry sliding coefficients of friction (Jl) for the composites sliding on themselves and reasonable values for the wear coefficient (k) were measured. Wear was found to be dominated by tribochemical reactions forming tribofilms which act to reduce wear of the disc. However, the presence of TiB2 was not seen to contribute directly to the tribological properties of these materials and the usefulness of this type of composite is questioned.
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Cledat-Schneider, Sandrine. "Elaboration et propriétés de composites particulaires AlN-TiB2". Limoges, 1997. http://www.theses.fr/1997LIMO0028.
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Dans le but d'evaluer puis d'optimiser leurs proprietes, des composites ceramiques particulaires aln-tib#2 denses (d#r>99 %) ont ete elabores, sans utilisation d'ajout de frittage, par compression isostatique a chaud de melanges de poudres de nitrure aln et de borure tib#2. L'etude des proprietes thermomecaniques et elastiques a permis de selectionner une composition (tib#2 : 75 mol. % ; aln : 25 mol. %) presentant a l'ambiante des caracteristiques mecaniques optimales. L'utilisation de poudres commerciales de plus faible granulometrie ameliore la resistance a la rupture a l'ambiante et la valeur de 620 mpa est conservee jusqu'a 1100c. Le comportement au fluage en flexion de ce materiau est gouverne par la cavitation. La tenue aux chocs thermiques est toutefois limitee a 340c. La seconde partie concerne l'elaboration d'un composite equimolaire aln-tib#2 dense par reaction exothermique entre une poudre de diborure d'aluminium alb#2 et une poudre de nitrure de titane tin, puis densification. La microstructure est fine et homogene, la taille des grains n'excede pas le micrometre. Les proprietes sont tres faiblement ameliorees par rapport au cas precedent. Enfin, la reactivite des materiaux monolithiques aln et tib#2 et celle du composite equimolaire aln-tib#2 ont ete etudiees par analyse thermogravimetrique en regime dynamique d'oxygene. Le composite equimolaire presente une resistance a l'oxydation intermediaire entre celle du diborure de titane qui debute a 700c et celle du nitrure d'aluminium qui commence a 1000c par la formation d'une phase oxynitrure (al#1#0n#8o#3) precedant celle de l'alumine-. Le piegeage in situ d'une partie de l'oxyde b#2o#3 par le nitrure d'aluminium ou l'alumine conduit a la formation d'aluminoborates al#4b#2o#9 et al#1#8b#4o#3#3, ce qui diminue tres fortement la production des vapeurs corrosives de sesquioxyde de bore qui, dans le cas du borure pur, sont observees des 900c.
Części książek na temat "TI02 COMPOSITE"
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Da Dalt, Silvana, Annelise Kopp Alves i Carlos Pérez Bergmann. "CNTs/TiO2 Composites". W Carbon Nanostructures, 97–111. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31960-0_6.
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Han, Baoguo, Siqi Ding, Jialiang Wang i Jinping Ou. "Nano-TiO2-Engineered Cementitious Composites". W Nano-Engineered Cementitious Composites, 561–99. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7078-6_6.
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Lei, X. L., Dong Ming Zhang i Lian Meng Zhang. "Preparation and Conductivity of TiO2-Doped Y2O3-Stabilized ZrO2 Ceramic". W Composite Materials V, 120–25. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-451-0.120.
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Ochando-Pulido, Javier Miguel, José Raúl Corpas-Martínez, Marco Stoller i Antonio Martínez-Férez. "Organic/TiO2 Nanocomposite Membranes: Recent Developments". W Organic-Inorganic Composite Polymer Electrolyte Membranes, 25–46. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52739-0_2.
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Kamat, Prashant V., i M. Anpo. "Energing Applications of TiO2-Based Composites". W Nanostructure Science and Technology, 717–39. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-0-387-48444-0_30.
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Mestral, F., i F. Thevenot. "Boride-Carbide Composites: TiB2-TiC-SiC". W The Physics and Chemistry of Carbides, Nitrides and Borides, 457–81. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2101-6_28.
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Sasidharan Pillai, Indu M., i K. L. Priya. "TiO2-Based Composites for Water Decolorization". W Sustainable Textiles: Production, Processing, Manufacturing & Chemistry, 103–42. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2892-4_5.
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Wang, Haijing, He Li, Lihua Chai, Tiejun Ma, Ningning Jian, Tounan Jin, Ziyong Chen i Guodong Shi. "Effect of TiB2 Content on Wear Resistance of TiB2/7055 Composite Materials". W High Performance Structural Materials, 891–98. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0104-9_93.
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Rusu, E., V. Ursaki, T. Gutul, P. Vlazan i A. Siminel. "Characterization of TiO2 Nanoparticles and ZnO/TiO2 Composite Obtained by Hydrothermal Method". W 3rd International Conference on Nanotechnologies and Biomedical Engineering, 93–96. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-736-9_22.
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Okada, Masuo, Takashi Iijima i Motofumi Homma. "New Composite PTC Materials Based on PbTiO3-TiO2". W Ceramic Microstructures ’86, 697–706. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1933-7_70.
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Haider, Muhammad Istiaque, Benjamin Church, Pradeep Rohatgi i Nathan Salowitz. "Investigation Into Etching Effects on the Interface Strength Between Nickel Titanium and Bismuth Tin for the Creation of Metal Matrix Self Healing Composites". W ASME 2022 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/smasis2022-90256.
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Abstract This paper presents recent research into the effects of etching treatments on the interface strength between nickel titanium (NiTi) fibers and a bismuth tin (BiSn) matrix composing a self-healing metal-metal composite. Self-healing metallic composites have the potential to create a paradigm shift in the design of engineered structures by changing what is considered a “failure,” resulting in lighter weight and safer structures with reduced maintenance requirements. Some of the most advanced self-healing metal-metal composites are composed of NiTi shape memory alloy fibers reinforcing an off-eutectic metal matrix. When activated these materials can recover from macroscopic deformations and matrix fracture, returning to their original geometry and then soldering cracks closed. This process restores nearly 100% of original strength without using any consumable adhesives. As a result, this healing process has the potential to be repeated indefinitely. The strength of the interface between the fibers and matrix is critical to creating high-quality composites because it governs the ability to transfer loads between the matrix and fibers, through the structure. Unfortunately, NiTi forms an inert native titanium oxide (TiO2) surface layer when exposed to air that is notoriously hard to bond to. To overcome this weak bonding most initial work in self-healing using NiTi fibers employed structural anchors within specimens for the NiTi to react against. This approach was functional for demonstrating basic components of self-healing abilities but negated distributed load transfer between the fibers and matrix of the composite structure, creating concentrated load-paths and resulting in a poor composite structure. Chemical etching in an inert environment has been performed to remove the inert TiO2 surface layer from NiTi, but the resulting interface strength has not previously been quantified. This paper presents an experimental investigation of the strength of the interface between NiTi and BiSn with both the native oxide layer present (control) and after undergoing a chemical etching process in an inert environment to remove the TiO2 layer and coating the NiTi while in the inert environment to prevent re-formation of the TiO2 layer. Testing was performed using single fibers of NiTi cast into and extending out of a BiSn block. The fiber/wire was mechanically pulled out of the BiSn block while measuring the force applied and recording video of the process. The experimental evaluation of these interface strengths in this research will enable the efficient design of composite materials to ensure proper load transfer between composite fibers and matrix to maximize strength and support self-healing capabilities.
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Peng, Xu-Dong, Ji-Yun Li i Qun-Feng Zeng. "Study on the Friction and Wear Behavior of PEEK Composites Filled With Nanometer Compounds and PTFE". W 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21442.
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The friction and wear behavior of polyetheretherketone (PEEK) composites was investigated, which are reinforced with nanometer Al2O3 or nanometer TiO2 and blended with polytetrafluoroethylene (PTFE) in a fixed weight fraction of 10% and are prepared by heat compression moulding. The studies emphasized particularly on the nanometer Al2O3 filled PEEK composites. The tests were performed on a pin-on-disc test apparatus with a PEEK composite pin sliding against AISI 1020 carbon steel disc under dry friction conditions and were all carried out at room temperature. The worn surfaces of the PEEK composites were examined by scanning electron microscopy (SEM). Results indicated that the above PEEK composites exhibited lower friction coefficient and wear rate in comparison with the mixture of PEEK with PTFE. The SEM micrographs of the worn surfaces indicated that the scratched and ploughed marks appeared on the wear scar of PEEK filled with PTFE, while the scuffing on the worn surfaces of nanometer Al2O3/PTFE/PEEK was obviously abated. The optimal content of nanometer Al2O3 in the filled PEEK composite should be recommended as 6.5 wt %. The friction behavior of the nanometer TiO2/PTFE/PEEK composites was far better than that of the nanometer Al2O3/PTFE/PEEK composites under the same test conditions and with the same content of nanometer compounds, which was perhaps due to much more strong synergistic effect between nanometer TiO2 and PTFE than that between nanometer Al2O3 and PTFE.
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Hudika, Tomislav, Tomislav Cigula, Mihaela Žličarić i Maja Strižić Jakovljević. "PCL-TiO2 nanocomposite to improve ageing of offset prints". W 10th International Symposium on Graphic Engineering and Design. University of Novi Sad, Faculty of technical sciences, Department of graphic engineering and design,, 2020. http://dx.doi.org/10.24867/grid-2020-p10.
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UV radiation or sunlight can affect the printed sample by fading the ink surface and therefore the product losses it's decorative purpose and becomes less desirable to the customer. To create the efficient protective coating, titanium dioxide (TiO2) will be used as a well-known compound that should lower the effects of UV radiation. TiO2 should lower the colour fade after UV radiation and this will be determined by densitometric and colorimetric (CIE L*a*b*) measurements. In addition, measurement of print gloss will also be conducted to evaluate visual appearance of the sample. Biopolymer Polycaprolactone (PCL) was the base of the PCL-TiO2 composite in which TiO2 nano sized. To determine influence of the amount of TiO2, three composites were prepared by adding different weight ratio of the TiO2. The prepared nanocomposites were then applied onto the offset prints on gloss art print paper and on the uncoated paper. The results have shown that TiO2 coating does affect ink’s density, colorimetric properties and print gloss after initial coating. The change in chroma due to the accelerated ageing is most visible on yellow ink, cyan and magenta proved to be the more stable. Accelerated ageing caused change in the L* of black. On all colours, increase of the TiO2 weight ratio improved resistance of colour to change. Coated gloss paper was more resistant to density change where uncoated had lower change in chroma. It could be concluded that TiO2 has the ability to protect the prints in the measured time interval but it has to be noted that concentration of the TiO2 particles also causes colour difference and must be observed when defining composure of the nanocomposite.
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Pandey, Akash B., Prakash K. Brahmankar i Harsh S. Purohit. "Experimental Determination of Parameters to Avoid Arcing in Electrical Discharge Machining of Titanium Diboride Particulate Reinforced Ferrous Matrix Composite". W ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39886.
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Titanium diboride (TiB2) particles are most popular reinforcement along with tungsten carbide for ferrous matrices for developing composites with high specific modulus, improved wear resistance and hardness while providing good fatigue properties as well. The hardness of such composites poses a problem in conventional machining in terms of very fast wear rates of tools and very high cutting forces. Non-conventional processes like electrical discharge machining (EDM) are very popular for machining of conductive composites like TiB2 reinforced ferrous matrix composites. However, there are a large number of process parameters for EDM which need to be selected and controlled carefully for satisfactory machining performance. Parameter settings which lead to arcing are specifically investigated and avoided as this phenomenon leads to uncontrolled machining through short circuit conditions and large energy discharges. In this paper, an experimental approach to determine the parameter settings which will lead to arcing during EDM machining of TiB2 particulate reinforced ferrous matrix composite is discussed. Values of major EDM process parameters are selected in roughing, intermediate and finishing domains. Experimental trials using L27 design of experiment are conducted and parameter combinations leading to arcing are recorded and the zone of parameters that can lead to arcing is identified.
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Pandey, Akash B., Prakash K. Brahmankar i Harsh S. Purohit. "Experimental Determination of Parameters to Avoid Arcing in Electrical Discharge Machining of Titanium Diboride Particulate Reinforced Ferrous Matrix Composite". W ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39891.
Pełny tekst źródłaStreszczenie:
Titanium diboride (TiB2) particles are most popular reinforcement along with tungsten carbide for ferrous matrices for developing composites with high specific modulus, improved wear resistance and hardness while providing good fatigue properties as well. The hardness of such composites poses a problem in conventional machining in terms of very fast wear rates of tools and very high cutting forces. Non-conventional processes like electrical discharge machining (EDM) are very popular for machining of conductive composites like TiB2 reinforced ferrous matrix composites. However, there are a large number of process parameters for EDM which need to be selected and controlled carefully for satisfactory machining performance. Parameter settings which lead to arcing are specifically investigated and avoided as this phenomenon leads to uncontrolled machining through short circuit conditions and large energy discharges. In this paper, an experimental approach to determine the parameter settings which will lead to arcing during EDM machining of TiB2 particulate reinforced ferrous matrix composite is discussed. Values of major EDM process parameters are selected in roughing, intermediate and finishing domains. Experimental trials using L27 design of experiment are conducted and parameter combinations leading to arcing are recorded and the zone of parameters that can lead to arcing is identified.
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Popovska, Nadejda, Emad Alkhateeb, Tanja Kugler, Andreas P. Fro¨ba i Alfred Leipertz. "Thermal Conductivity of Biomorphic Porous SiC Based Ceramics". W 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22341.
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Biomorphic porous SiC composite ceramics were produced by chemical vapor infiltration and reaction (CVI-R) technique using paper preforms as template. The thermal conductivity of four samples with different composition and microstructure was investigated: a) C-template b) C-SiC, c) C-SiC-Si3N4 and d) SiC coated with a thin layer of TiO2. The SiC-Si3N4 composite ceramic showed enhanced oxidation resistance compared to single phase SiC. However; a key property for the application of these materials at high temperatures is their thermal conductivity. The later was determined experimentally at defined temperatures in the range 298–373K with a laser flash apparatus. It was found that the thermal conductivity of the porous ceramic composites increases in the following order: C-template < C-SiC < C-SiC-Si3N4 < SiC-TiO2. The results were interpreted in regard to the porosity and the microstructure of the ceramics.
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Lin, D. C., S. Liu, T. M. Guo, G. X. Wang i T. S. Srivatsan. "A Study of the Transport of Nanopowders in a Solidifying Solder Melt and its Influence on Microstructural Development". W ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/htd-24353.
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Abstract Recent experiments have clearly demonstrated an innate capability to judiciously use nanopowders to increase the strength of engineering materials. This can be achieved even for low weight percentages of the nanopowders, as low as a few percent. This research finding has provided the much desired impetus of producing high-strength materials by adding small amounts of nanopowders into a solidifying molten metal with the objective of forming nano-particle reinforced metallic composites. A practical application of such a composite is in microelectronic and/or opto-electronic devices and assemblies, which necessitate the need for high strength solders. This paper presents preliminary results of experiments aimed at understanding the kinetics governing the solidification of solders blended with nanopowders. Composite solder paste was prepared by mechanically mixing nanopowders of either copper or TiO2 with tin-lead powders (tens of microns in size). Solidification experiments of the composite solders were performed in an aluminum crucible and temperature variations during cooling and solidification were measured. For the TiO2 nanopowder reinforced composite solders, the data show a strong melt undercooling followed by recalescence to an increased melting temperature, while for the Cu nanopowder reinforced composite solders, one sees a reduced melting temperature with two-stages of solidification. Metallographic observations of the solidified composite solders find a significant reduction in both the grain size and spacing of eutectic lamellae, leading to an increase in microhardness.
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Chinnakurli Suryanarayana, Ramesh, Ummar Khan Attaullah, Kumar Saheb, Apoorva Kumar i Manoj Kumar Rajput. "Slurry Erosive Wear Behavior of Forged Al6061-CeO2-TiO2 Hybrid Composites". W ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64402.
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Aluminium alloys are being widely used in naval applications owing to their excellent corrosion resistance and high formability characteristics. One of the most popular naval components is the tarpedo blade which makes use of forged aluminium alloy followed by anodizing surface treatment for corrosion protection. In recent years, there have been few attempts to replace the conventional aluminium alloys by their composites for the tarpedo blade applications. Literature review clearly says that CeO2 (Ceria) coating on aluminium and aluminium composites enhances their corrosion protection in aggressive marine environment. Further, there are reports suggesting that combination of CeO2 and TiO2 do yield better corrosion protection. However, there is no information on the work related to development of hybrid ceramic reinforced aluminium alloy matrices with CeO2 and TiO2 as particulate reinforcements for potential naval applications. In the light of above, the present work focuses on the development of novel Al6061-CeO2-TiO2 hybrid metal matrix composite by stir casting route followed by hot extrusion with an extrusion ratio of 8:1 at a temperature 550 °C and hot forging at 475 °C. The developed forged hybrid composites and the matrix alloy have been evaluated for microstructure, micro hardness and slurry erosion wear tests as per the ASTM Standards.
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Chen, Chun-Hsien, Jay Shieh, Chao-Sung Lin i Jing-Jong Shyue. "Photocatalytic Behaviors of TiO2-SrTiO3 Composite Thin Film and Nanostructure". W ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4956.
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To improve the efficiency of water splitting by photocatalysis, a semiconductor heterojunction made of titanium dioxide (TiO2) and strontium titanate (SrTiO3) is constructed to promote the separation of photo-induced electron and hole (e− /h+) pairs. The photocatalytic behaviors of the TiO2-SrTiO3 composite film and nanostructure fabricated by the sol-gel and hydrothermal methods are studied. UV-visible and ultraviolet photoelectron spectroscopies (UV-Vis & UPS) are adopted to identify the band structure of the TiO2-SrTiO3 heterojunction. For the composite film system, an approximately 0.5 eV band shift at the heterojunction improves the separation of photoinduced e−/h+ pairs. The photocurrent density of the composite film is about 2–3 times larger than that of the TiO2 or SrTiO3 film alone. For the composite nanostructure system, it is composed of an array of TiO2 nanotubes coated with SrTiO3 nanoparticles. An approximately 0.2 eV band shift at the heterojunction is determined for the composite nanostructure. It is found that the size of the SrTiO3 nanoparticles, which can be controlled by the hydrothermal temperature and time, is a key factor in influencing the photocurrent density of the TiO2-SrTiO3 composite nanostructure.
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Yang, G. J., C. J. Li, S. Q. Fan, L. Z. Zhang, C. X. Li i Y. Y. Wang. "Influence of Annealing Treatment on the Photocatalytic Performance of the Nanostructured TiO2 Coating Deposited by Vacuum Cold Spray". W ITSC2007, redaktorzy B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima i G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0644.
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Abstract Composite powder in sub-micrometer size was prepared using a primary nano-TiO2 powder and polyethylene glycol (PEG). The nano-TiO2 coating was deposited through vacuum cold spray using both the composite powder and primary nano- TiO2 powder. The influence of annealing treatment on coating adhesion and photocatalytic activity was investigated. The coating adhesion was estimated through erosion test by water jet. The photocatalytic performance of the TiO2 coatings was evaluated through photodegradation of phenol in water. The results showed that annealing of the coating at a temperature from 450 to 500 °C yielded both higher activity and better adhesion. The adhesion of the coating deposited using the composite powder was better than that using primary nano- TiO2 powder. It was found that TiO2 coating resulting from the composite powder presented much higher activity than that deposited with primary nano-particles. The better activity is attributed to the existence of large pores resulting from the stacking of composite powder, which benefits the reactants transportation through the porous coating.
Raporty organizacyjne na temat "TI02 COMPOSITE"
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Reyes, Karla, Zachary Stephens i David Robinson. Composite WO3/TiO2 nanostructures for high electrochromic activity. Office of Scientific and Technical Information (OSTI), maj 2013. http://dx.doi.org/10.2172/1089995.
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Gilde, Gary A., i Jane W. Adams. Processing and Ballistic Performance of Al2O3/TiB2 Composites. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2005. http://dx.doi.org/10.21236/ada444281.
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