Pseudobinary Joins of the LiF-BaF2-AIF3 Ternary System

3LiF · AIF3-BaF2 and 3LiF · AIF3-3BaF2 · 2AIF3 pseudobinary joins of the LiF-BaF2-AIF3 ternary system were studied by DTA and XRD. Calculated and experimental eutectic compositions and temperatures are reported

Membrane transport of dicarboxylic and α-hydroxy carboxylic acids induced by α-amino phosphonates

New α-amino phosphonates containing different alkyl and aryl substituents at the α-carbon atom were synthesized in high yields by the Kabachnik - Fields and Pudovik reactions. These compounds were studied as carriers of several α-hydroxy carboxylic and dicarboxylic acids through liquid impregnated membranes. These α-amino phosphonates studied are capable of molecular recognition of oxalic acid among structurally similar α-hydroxy carboxylic and dicarboxylic acids. The efficiency and selectivity of mass transfer of oxalic acid increase with an increase in the lipophilicity of the α-amino phosphonate

Pseudobinary Joins of the LiF-BaF2-AIF3 Ternary System

3LiF · AIF3-BaF2 and 3LiF · AIF3-3BaF2 · 2AIF3 pseudobinary joins of the LiF-BaF2-AIF3 ternary system were studied by DTA and XRD. Calculated and experimental eutectic compositions and temperatures are reported

Pseudobinary Joins of the LiF-BaF2-AIF3 Ternary System

3LiF · AIF3-BaF2 and 3LiF · AIF3-3BaF2 · 2AIF3 pseudobinary joins of the LiF-BaF2-AIF3 ternary system were studied by DTA and XRD. Calculated and experimental eutectic compositions and temperatures are reported

Pseudobinary Joins of the LiF-BaF2-AIF3 Ternary System

3LiF · AIF3-BaF2 and 3LiF · AIF3-3BaF2 · 2AIF3 pseudobinary joins of the LiF-BaF2-AIF3 ternary system were studied by DTA and XRD. Calculated and experimental eutectic compositions and temperatures are reported

Determination of chromium from a hydroxylamine catalytic current by flow-injection analysis

A catalytic wave was first found on a dropping mercury electrode in the system Cr(III)-hydroxylamine-ammonium buffer solution studied by conventional polarography and flow-injection analysis. This catalytic wave can be used for the flow-injection determination of low concentrations of Cr(III). © 1998 MAEe cyrillic signK Hayκa/Interperiodica Publishing

Pseudobinary Joins of the LiF-BaF2-AIF3 Ternary System

3LiF · AIF3-BaF2 and 3LiF · AIF3-3BaF2 · 2AIF3 pseudobinary joins of the LiF-BaF2-AIF3 ternary system were studied by DTA and XRD. Calculated and experimental eutectic compositions and temperatures are reported

Determination of chromium from a hydroxylamine catalytic current by flow-injection analysis

A catalytic wave was first found on a dropping mercury electrode in the system Cr(III)-hydroxylamine-ammonium buffer solution studied by conventional polarography and flow-injection analysis. This catalytic wave can be used for the flow-injection determination of low concentrations of Cr(III). © 1998 MAEe cyrillic signK Hayκa/Interperiodica Publishing

Le Courrier des spectacles, ou Journal des théâtres

20 février 18041804/02/20 (N2550)

A method for the in-situ study of solid-state joining techniques using synchrotron radiation - observation of phase transformations in Ti-6Al-4V after friction surfacing

The solid-state deposition process Friction Surfacing (FS) was applied to Ti-6Al-4V alloy on portable welding equipment at a high-energy synchrotron beamline. The heat input and coating thickness were altered by varying the deposition speed. X-ray diffraction was carried out in-situ during the deposition process and the cooling of the coated samples. Phase transformations were evaluated and correlated with thermal cycles determined by thermocouples and an infrared camera. SEM investigation of the coating microstructure was conducted to examine the morphology of the $α$ phase. During FS the coating material is severely deformed and dynamically recrystallized in the $β$ phase state at temperatures > 1300 °C. Small changes in the $β$ grain size were observed within the first 2 s after deposition only. Depending on the cooling rate it transforms into different types of α phase during cooling. Phase transformation rates were found to correlate well with the differences in α morphology. The two faster translational speeds showed transformation rates > 45 vol%/s and a partially martensitic microstructure.When a thick coating is deposited at low translational speed, $α → β$ transformation continues for several seconds after deposition, followed by a slow cooling rate resulting in martensite free coatings containing $α_m$ from massive transformation. The potential gain and the deficiencies of this complex in-situ study of a technical process, instead of simplified model experiments, for the understanding of fundamental mechanisms involved in FS are discussed