Register

Create your own FREE account with surfacequery.com and we will contact you with more details about a subscription or a one-off search.

More details…

Search

Here you can perform a record search by entering keywords.

You can use the special keywords AND, OR and NOT in between words to refine your search.

This search also supports the wildcard character * and the use of quotes.

Subscription or one-off search

With a subscription or a one-off seach, the "author", "journal", "source", "date", "volume" and "page" details are presented along with the "abstract titles" and "anstracts".

More details…

2537 results. per page « 5 6 7 8 9 10 11 12 13 14 15 »

Lanthanum chromite coating.

Relevancy:  

Aluminium chromite film is obtained by plasma spray coating with powder containing 1-15 pts wt Cr2O3 powder per 100 pts wt La chromite powder and heat treating.

Lanthanum conversion on surface of hot-dip galvanized zinc aluminium coating.

Relevancy:  

Hot-dip galvanized Zn-2wt% Al alloy coating on steel substrate was chemically converted in a solution with La(NO3)3.6H2O as main salt, H2O2 as oxidant, and NaF as promoter. The effects of different factors on corrosion resistance of the conversion coating were studied through orthogonal test. The optimal range of different parameters for lanthanum conversion are as follows: La(NO3)3.6H2O 10-15 g/L, H2O2 10 mL/L, NaF 0.5 g/L, temperature 70°C, and time 10-30 min. Both film forming temperature and time have great effects on corrosion resistance of the conversion coating. The addition of NaF is beneficial to film formation. The area fraction of white rust on lanthanum conversion coating obtained under the optimal conditions is 15% after neutral salt spray test for 3 periods, show better corrosion resistance than that of the unpassivated Zn-2wt% Al alloy coating.

Lanthanum hexaaluminate - novel thermal barrier coatings for gas turbine applications - materials and process development

Relevancy:  

SURF Lanthanum hexaaluminate (LHA) with a magnetoplumbite structure is a promising competitor to yttria partially stabilized zirconia (Y-PSZ) as a thermal barrier coating (TBC), since most zirconia coatings age significantly, including undesired densification at temperatures exceeding 1100°C. The microstructure of calcined lanthanum hexaaluminate powders and thermally sprayed coatings show a platelet structure. The magnetoplumbite structure is characterized by the highly charged La*3+ cation located in an oxygen position in the hexagonal close-packed structure of oxygen ions. Ion diffusion is strongly suppressed vertical to the crystallographic c-axis, thus hindering sintering densification. In contrast to the oxygen ion conducting zirconia, lanthanum hexaaluminate permits operating temperatures above 1300°C because of its thermal stability and electrically insulating properties. This study describes the optimization of powder preparation for thermal spraying by spray drying and the development of parameters for atmospheric plasma spraying (PS) in order to produce homogeneous crystalline coatings with controlled micro-porosity and residual stresses. The phases were characterized by X-ray diffraction (XRD).

Lanthanum hexaaluminate - novel thermal barrier coatings for gas turbine applications - materials and process development

Relevancy:  

SURF Lanthanum hexaaluminate (LHA) with a magnetoplumbite structure is a promising competitor to yttria partially stabilized zirconia (Y-PSZ) as a thermal barrier coating (TBC), since most zirconia coatings age significantly, including undesired densification at temperatures exceeding 1100°C. The microstructure of calcined lanthanum hexaaluminate powders and thermally sprayed coatings show a platelet structure. The magnetoplumbite structure is characterized by the highly charged La*3+ cation located in an oxygen position in the hexagonal close-packed structure of oxygen ions. Ion diffusion is strongly suppressed vertical to the crystallographic c-axis, thus hindering sintering densification. In contrast to the oxygen ion conducting zirconia, lanthanum hexaaluminate permits operating temperatures above 1300°C because of its thermal stability and electrically insulating properties. Reports the optimization of powder preparation for thermal spraying by spray drying and the development of parameters for atmospheric plasma spraying (PS) in order to produce homogeneous crystalline coatings with controlled micro-porosity and residual stresses. The phases were characterized by X-ray diffraction (XRD).

Lanthanum Phosphate Bonded Composite Nickel Rhodium Electrodes for Alkaline Water Electrolysis

Relevancy:  

JES Spiky nickel particles were coated with rhodium by a displacement reaction and these were then incorporated into a La phosphate + La hydroxide mass, pressed & dried and used as electrodes. Tafel plots, specific surface areas, surface roughness, DTA and other parameters are reported. 32 refs.

Lanthanum silicate thin films for SOFC electrolytes synthesized by magnetron sputtering and subsequent annealing.

Relevancy:  

Lanthanum zirconate thermal barrier coatings deposited by spray pyrolysis.

Relevancy:  

SURF The fabrication of thick nanostructured lanthanum zirconate thermal barrier coatings deposited by spray pyrolysis from aqueous nitrate based precursor solutions is presented. After deposition, the green coatings are decomposed to introduce vertical cracks which are beneficial to enhance the thermo-mechanical compliance of the coatings. The cracks were stable after crystallization of the coatings to the cubic pyrochlore structure by further heat-treatment. Nanocrystalline mono- and multi-layered coatings with contrasting crack patterns were produced based on the knowledge of the influence of the different parameters. Multilayered coatings with small crack spacing and crack opening exhibited a higher density, a lower thermal diffusivity, and a higher thermal conductivity of ~ 0.34 W/(múK) at elevated temperatures compared to monolayered coatings of similar thickness with larger crack spacing and crack opening. The low thermal properties of the crystalline coatings were attributed to the nanostructure of the coatings.

Lanthanum-based conversion coating on magnesium alloy.

Relevancy:  

The lanthanum-based conversion coating on AZ 31D magnesium alloy and its corrosion resistance were investigated. The morphology and composition of the coating were studied by scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) respectively. The corrosion resistance of the coating was assessed by means of potentiodynamic polarization measurements. The results show that the conversion coating, with a needle like micro-morphology, is about 8 µm thick, mainly composed of La and O, and has a good covering power to magnesium alloy; the coating is obviously passivated during anodization, the corrosion potential moves positively about 500 mV, and the corrosion current density decreases by two orders of magnitude, obviously improving the corrosion resistance of AZ 31D magnesium alloy.

Lap-joint corrosion of automotive coated materials in chloride media. Part 1 - Electrogalvanized steel

Relevancy:  

SURF Mechanisms involved in lap-joint corrosion in new painting substrates for automotive industry, are not clear. Electrogalvanized steel is studied using special specimens with spot-welded lap-joints, before and after salt-spray exposure. Special lap-joint spacements and positions were involved. Corrosion mechanisms are proposed.

Lap-joint corrosion of automotive coated materials in chloride media. Part 2 - galvannealed steel

Relevancy:  

SURF Galvannealed steel is studied using special specimens with spot-welded lap-joints, before and after salt-spray exposure. Corrosion mechanisms are proposed. Galvannealing did not alter main mechanisms or chemical reactions involved in lap-joint corrosion already observed for electrogalvanized steel. However, in case of galvanneal, corrosion propagation step seems to be significantly moderate.

Lap-joint corrosion of automotive coated materials in chloride media. Part 3 - Electrogalvanized steel/galvanneal interface

Relevancy:  

SURF Aim was to study lap-joint corrosion of zinc-coated automotive painting substrates: electrogalvanized steel, galvanneal, and electrogalvanized/galvanneal assemblies. Parts 1 and 2 were dedicated spec. to electrogalvanized steel and galvanneal, resp. In final part, special case of mixed lap joints involving electrogalvanized steel and galvanneal is studied. Study suggests that coupling of galvanneal with electrogalvanized steel contributes to decreasing galvanneal corrosion inside lap joints, while electrogalvanized steel suffers increase in lap-joint corrosion. These phenomena seem due to significant transformations among alloy phases and corrosion products, which seem to start with Zn consumption of electrogalvanized steel surface and, only subsequently, of galvanneal surface.

Lap-Joint Corrosion of Precoated Materials for Building Applications.

Relevancy:  

SURF The adoption of designs involving the use of lap joints is becoming increasingly common in the building industry. However, precoated steel sheets assembled by lap joints are prone to suffer durability problems associated with this type of joint, such as the premature deterioration of protective coatings (metallic, organic) and accelerated metallic corrosion of the base steel by moisture retention in the lap. The literature reveals a lack of knowledge about the corrosion mechanisms and primary factors involved in this issue. Lap-joint corrosion is studied in relation with two zinc-based coatings used in the building industry: 55%Al-Zn and hot-dip galvanised (HDG), unpainted and painted, and before and after atmospheric exposure or accelerated ageing (salt fog and Prohesion tests). The proposed corrosion mechanisms are based on results obtained by visual observation and by scanning electron microscopy (SEM) associated with X-ray energy dispersive spectrometry (EDS). Complementary X-ray diffraction (XRD) has also been used. With the unpainted precoated steel sheets, localised attack of the the metallic coating is observed in the lapped area. In the case of the metallic+ organic coatings, attack is initiated in the lapped area and advances towards the non-lapped area.

Lapis lazuli coating

Relevancy:  

Coating of mixture of lapis lazuli is applied to substrate by mixing crystalline lapis lazuli pigment (grain size 5-90µm) with colourless vehicle comprising self-curing or reaction curing lacquer system; mixing each 100 g vehicle with 25-80 g pigment and 1-6 g pyrite; applying mixture to substrate; drying or curing; and grinding or polishing mixture on substrate.

Lapping and polishing fixture with flexible sides

Relevancy:  

Fixture for holding workpiece comprises opening(s) with flexible side(s) for elastically holding workpiece, and slot adjacent side(s) to allow flexing.

Lapping and Polishing Technology.

Relevancy: