Top PDF Carbon or boron modified titanium silicide

Carbon or boron modified titanium silicide

Carbon or boron modified titanium silicide

A titanium silicide material based on Ti.sub.5 Si.sub.3 intermetallic compound exhibits substantially improved oxidative stability at elevated temperatures. In particular, carbon is added to a Ti.sub.5 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.6 weight % C) effective to impart substantially improved oxidative stability at elevated temperatures, such as about 1000 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.3 weight % B) to this same end.

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Carbon or boron modified titanium silicide

Carbon or boron modified titanium silicide

A titanium silicide material based on Ti.sub.5 Si.sub.3 intermetallic compound exhibits substantially improved oxidative stability at elevated temperatures. In particular, carbon is added to a Ti.sub.5 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.6 weight % C) effective to impart substantially improved oxidative stability at elevated temperatures, such as about 1000 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.3 weight % B) to this same end.

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Carbon or boron modified titanium silicide

Carbon or boron modified titanium silicide

A titanium silicide material based on Ti.sub.5 Si.sub.3 intermetallic compound exhibits substantially improved oxidative stability at elevated temperatures. In particular, carbon is added to a Ti.sub.5 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.6 weight % C) effective to impart substantially improved oxidative stability at elevated temperatures, such as about 1000 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.3 weight % B) to this same end.

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Substitutional carbon‐modified anatase TiO2 decahedral plates directly derived from titanium oxalate crystals via topotactic transition

Substitutional carbon‐modified anatase TiO2 decahedral plates directly derived from titanium oxalate crystals via topotactic transition

elements in the raw materials may result in the generation of hetero-atom modified metal oxides with tailored properties during the topotactic transition process. In this study, as a demonstration, we used titanium(IV) oxalate decahedron crystals as the raw material to produce carbon-modified anatase TiO 2 decahedral plates by the topotactic transition in a

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Carbon modified TiO2 for photocatalysis

Carbon modified TiO2 for photocatalysis

other researchers [20], that recombination of electron/ hole can be retarded by graphene. Lee et al. [11] described in details the reasons of graphene recombina- tion inhibition. Graphene may work as electron acceptor and transporter. Due to its two-dimensional π-conjuga- tion structure, it may also work as an acceptor of photo- generated electrons. On the other hand, due to its high conductivity, effective charge separation may be accom- plished through electrons transport. It is also proved here that the carbon layer can also consist of thin layer of graphite and the above described effects are still observed.
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Biologically Modified Titanium Substrates for Improved Surface Bioactivity

Biologically Modified Titanium Substrates for Improved Surface Bioactivity

Titanium (Ti) based implants function for a long term stability. To reduce such issue various surface functionalization method including surface coating has been explored. Here we successfully coated Ti substrates with Graphene Oxide (GO), Chitosan (Cs), and nanocomposite of GO and Cs (GO/Cs) via spin coated method to evaluate the osteogenic properties of each coatings. Uncoated Ti substrates were used as control. Scanning electron microscopy was used to investigate the coating morphology. Surface roughness measurements were achieved from atomic force microscopy. To measure surface wettability, contact angels method was performed. Ti substrates coated with Cs (Ti Cs ) and Cs/GO (Ti Cs/GO ) showed the highest surface
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Effect of Titanium Addition on Behavior of Medium Carbon Steel

Effect of Titanium Addition on Behavior of Medium Carbon Steel

Four steels with different titanium contents were melted in induction furnace of capacity 100 kg and cast in sand mold. Complete chemical analysis has been carried out for all cast steels. Ingots with diameter 90 mm were hot forged to about 40 mm square. The ingots were reheated up to 1200˚C and hold to 30 min then start forging. Starting forging temperature was 1150˚C while forging process was ended at temperatures 900˚C, 975˚C, and 1050˚C for the four steels. Microstructure examination and hardness measurements were carried out after for- ging process. Ferrite/pearlite ratios were measured using software Paxit program for forged steels. The forged bars —which ended at 975˚C—were reheated up to 960˚C for 1 hour and water-cooled followed by tempering at 260˚C for 30 min. The mechanical properties were measured for tempered steels. The standard V-notch Charpy specimens samples (10 mm × 10 mm × 55 mm, notch depth 2 mm) was prepared to investigate the influence of the titanium addition on impact toughness at 25˚C for tempered steels.
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Carbon Dioxide (CO2) Released in the Electrochemical Reduction of Titanium Dioxide (TiO2) to Titanium Metal

Carbon Dioxide (CO2) Released in the Electrochemical Reduction of Titanium Dioxide (TiO2) to Titanium Metal

into thermodynamic aspects of Ca-Ti-O-C-Cl system to pro- pose predominance area diagrams for electrochemical reduc- tion of titanium dioxide in molten calcium chloride. Interest- ing results/suggestions reported by this work include favour- able conditions for producing low oxygen titanium metal. According to these studies higher pO 2- values in the melt are

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A Comparison Study between Boron nitride Nanotubes and Carbon Nanotubes

A Comparison Study between Boron nitride Nanotubes and Carbon Nanotubes

Boron nitride is a chemical combine with chemical formula BN, consisting of equal numbers of boron and nitrogen atoms. BN is a similarly structured carbon and thus exists in various crystalline forms. Boron nitride (Fig.1 show BNNT) has a great potential in nanotechnology that Nanotubes of BN can be produced. Strictly indicating, 14 years prior to this synthesis Ishii et al. [1, 2] have described on the formation of hexagonal BN whiskers that in modern terminology would be called bamboo-like BNNTs.

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Exploring the Structure of the Most Neutron-rich Boron and Carbon Isotopes

Exploring the Structure of the Most Neutron-rich Boron and Carbon Isotopes

In the case of 22 C, the secondary beam intensities available during the early stage operations of the RIKEN-RIBF enabled inclusive measurements to be made of two-neutron removal on a carbon target at some 240 MeV/nucleon [16]. For comparison, measurements were also made on the neighbour- ing carbon isotopes, including 20 C. The momentum distributions were derived using a time-of-flight

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Effects of Titanium and Boron Additions with Cooling Rates on Solidification Behavior in Aluminum Alloys for Automotive Applications

Effects of Titanium and Boron Additions with Cooling Rates on Solidification Behavior in Aluminum Alloys for Automotive Applications

The cooling curves, fraction liquid and latent heat were estimated in the Al-Si and ADC12 based alloys in order to understand the solidification characteristics for the hypo- eutectic and eutectic chemical compisitions. The present authors believe that the different solidification behaviors are caused by the titanium and boron additions. Namely, the eutectic chemical composition is shifted into the higher concentration of silicon. Therefore, the similar phenomena during solidi fi cation between the Al-7 mass % Si and ADC12- M1 alloy are confirmed. Further researches to observe the microstructure and measure the mechanical properties and to describe the phase diagrams by the single addition of titanium or boron are required for the confirmative understanding about the solidification behavior.
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Biomineralization of a titanium-modified hydroxyapatite semiconductor on conductive wool fibers

Biomineralization of a titanium-modified hydroxyapatite semiconductor on conductive wool fibers

[55] H. Anmin, L. Ming, C. Chengkang, M. Dali. Preparation and characterization of a titanium-substituted hydroxyapatite photocatalyst. J. Mol. Catal. A-Chem., 2007, 267, 79 [56] C.C. Ribeiro, I. Gibson, M.A. Barbosa. The uptake of titanium ions by hydroxyapatite particles – structural changes and possible mechanisms. Biomaterials, 2006, 27, 1749-1761. [57] G.K. Toworfe, R.J. Composto, I.M. Shapiro, P. Ducheyne. Nucleation and growth of calcium phosphate on amine-, carboxyl-and hydroxyl-silane self-assembled monolayers. Biomaterials, 2006, 27, 631-642.
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Adsorption equilibrium of carbon dioxide on ammonia modified activated carbon

Adsorption equilibrium of carbon dioxide on ammonia modified activated carbon

adsorption/desorption capacities (Shafeeyan et al., 2012). The optimal adsorbent (a pre-oxidized sample that was aminated at 425 ◦ C for 2.12 h) exhibited promising adsorption/desorption performance during cyclical operations, making it suitable for practical applications. Therefore, in this work, the optimal adsorbent (referred to as OXA-GAC) was used as a starting material. Further details on the adsorbent preparation and modification can be found elsewhere (Shafeeyan et al., 2011, 2012). The commercial granular palm-shell-based activated carbon (referred to as GAC) evaluated in the present paper was obtained from Bravo Green Sdn Bhd (Malaysia). The CO 2 , N 2 ,
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Thermal effects on the magnetic properties of titanium modified cobalt ferrite

Thermal effects on the magnetic properties of titanium modified cobalt ferrite

It was found in the previous studies that magnetization, Curie temperature and even electrical properties of cobalt fer- rite can be controlled in a remarkably linear pattern by Ti 4þ substitution for Fe 3þ . 1,2 An inverse relationship, also depend- ent on the rate of co-substitution of Ti 4þ /Co 2þ , was reported for susceptibility and coercive field. 2,3 Nevertheless, the tem- perature dependence of the magnetic properties of titanium modified cobalt ferrite is not currently well understood. This is important for understanding the temperature dependence of other magnetic field controlled properties, such as magnetoe- lasticity. In Ge 4þ /Co 2þ , it was shown that the changes in mag- netoelastic properties with temperature could be explained by changes in magnetic properties with temperature. 4 Hence, this study focuses on the temperature dependence of magnetic properties in Ti 4þ /Co 2þ co-substituted cobalt ferrite.
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In Vivo Evaluation of Titanium Implants Bioactivated by a Modified Kokubo’s Treatment

In Vivo Evaluation of Titanium Implants Bioactivated by a Modified Kokubo’s Treatment

In this study solutions with varied amount of NaOH were used to treat titanium surfaces (Ti grade 4). The solu- tions were prepared with reagent grades containing Ca, Na and Si. The same base solution was used in the three situations, varying only the amount of NaOH, which was 1, 2 and 3 M NaOH. The samples were treated in these solutions in an autoclave for 1 to 5 hours at 120˚C. Afterwards, the samples were rinsed with distilled water and dried in air. Titanium grade 4 discs of 6 mm diameter and 3 mm in length were blasted with alumina powder (290 µm) and etched in HCl/H 2 SO 4 before the treatments. Three samples of each treatment were used for each
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Electrochemical stability of Titanium-Hydroxyapatite implantable material modified with Ceftriaxone

Electrochemical stability of Titanium-Hydroxyapatite implantable material modified with Ceftriaxone

1. D.M. Brunette, P. Tengvall, M. Textor and P. Thomsen, Titanium in Medicine: Material Science, Surface Science, Engineering, Biological Responses and Medical Applications, Springer Science & Business Media, (2011) Springer-Verlag Editorial/Production Heidelberger Platz 3 D-14197, Berlin.

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Biomineralization of a titanium-modified hydroxyapatite semiconductor on conductive wool fibers

Biomineralization of a titanium-modified hydroxyapatite semiconductor on conductive wool fibers

[56] C.C. Ribeiro, I. Gibson, M.A. Barbosa. The uptake of titanium ions by hydroxyapatite particles – structural changes and possible mechanisms. Biomaterials, 2006, 27, 1749-1761. [57] G.K. Toworfe, R.J. Composto, I.M. Shapiro, P. Ducheyne. Nucleation and growth of calcium phosphate on amine-, carboxyl-and hydroxyl-silane self-assembled monolayers. Biomaterials, 2006, 27, 631-642.

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PRODUCTION OF SELF-CLEANING CEMENT USING MODIFIED TITANIUM DIOXIDE

PRODUCTION OF SELF-CLEANING CEMENT USING MODIFIED TITANIUM DIOXIDE

in cement slabs having ratio 0.1 (C1), resulting in the increase in degradation efficiency in case of C2 sample. Degradation of 58, 62, 69, and 76% has been observed in case of doped samples C3, C4, C5, and C6, respectively. It can be observed that cement samples containing doped titanium dioxide (C3, C4, C5, C6) show better degradation than sample containing undoped titanium dioxide (C1, C2) under UV light as well as sun-light. The doping of titanium dioxide with silver prevents the recombination of holes and electrons, which results in better photocatalytic activity. As a results cement samples containing doped titanium dioxide present better degradation. TiO 2 gets active only in UV
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Ion Implantation As A Route To Enhancing Osseointegration On Modified Titanium Surfaces

Ion Implantation As A Route To Enhancing Osseointegration On Modified Titanium Surfaces

These have largely involved pre-treatment (in solutions or through thermal oxidation) or the provision of a ceramic or glass coating rich in calcium and phosphate[r]

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Carbon-boron clathrates as a new class of sp3-bonded framework materials

Carbon-boron clathrates as a new class of sp3-bonded framework materials

linkages between B icosahedra (9, 10), rather than establishing the overall structural framework. Of broader interest are 3D covalent organic frameworks (COFs), which are formed by linking sp 2 - hybridized molecular building blocks, that have attracted attention for gas storage and separations (11). Compared with the exquisite synthetic control over porous COF materials, the experimental prog- ress in denser sp 3 carbon-based structures lags far behind.

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