ChemInform Abstract: A NEW SYNTHESIS FOR (TRIFLUOROMETHYL)THIO ORGANOMETALLIC COMPOUNDS BY LOW-TEMPERATURE COCONDENSATION OF (TRIFLUOROMETHYL)THIO RADICALS AND METAL VAPOR

1983 ◽  
Vol 14 (18) ◽  
Author(s):  
T. R. BIERSCHENK ◽  
R. J. LAGOW
Keyword(s):  
Low Temperature ◽  
Organometallic Compounds ◽  
Metal Vapor ◽  
New Synthesis

Facile Synthesis of Ammonium Aluminum Carbonate Hydroxide Multilayered Nanofiber by Using Solid State Reaction

2011 ◽  
Vol 415-417 ◽  
pp. 580-584 ◽  
Author(s):  
Xiao Fu Hu ◽  
Yun Qi Liu ◽  
Chen Guang Liu
Keyword(s):  
Phase Transformation ◽  
Elevated Temperature ◽  
Solid State ◽  
Low Temperature ◽  
Aluminum Oxide ◽  
Solid State Reaction ◽  
Particle Sizes ◽  
Facile Synthesis ◽  
New Synthesis ◽  
Carbonate Hydroxide

In this paper, we make systematical investigation for the new synthesis pathway of AACH multilayered nanofiber, which has been prepared by a low-temperature solid-state reaction. The phase transformation sequence of AACH on heating is found that the precursor converts into γ-Al2O3at 700-900°C and elevated temperature results in the θ-Al2O3and α- Al2O3crystal phase formation at 1000°C. With a higher calcination temperature at 1100°C, α- Al2O3pattern appears. The specific surface area (SBET) of aluminum oxide specie calcined at 500°C for 4h is still in 420.2m2/g. Meanwhile, it suggests a partial change in particle sizes and morphology of sample calcined at 500°C for 4h.

Plasma Diagnostics of Arc during MIG Welding of Aluminum

2014 ◽  
Vol 783-786 ◽  
pp. 2828-2832
Author(s):  
Manabu Tanaka
Keyword(s):  
Low Temperature ◽  
Temperature Region ◽  
Plasma Diagnostics ◽  
Optical Measurement ◽  
Metal Vapor ◽  
Vapor Concentration ◽  
Arc Plasma ◽  
Mig Welding ◽  
High Concentration ◽  
Double Structure

In this study, distributions of temperature and metal vapor during MIG welding of aluminum are obtained. Since a droplet forms and detaches at a tip of wire, and pass through the arc plasma during MIG welding, dynamic plasma diagnostics are demanded. This study aims to develop method for measuring dynamical variation of two-dimensional distribution of temperature and metal vapor concentration in the arc through optical measurement and to analyze behavior of the metal vapor in MIG welding. As the results, in MIG welding of aluminum, the arc plasma has double structure consisting of high temperature region apart from the arc axis and low temperature region near the arc axis due to influence of the aluminum vapor. Furthermore, the low temperature region near the arc axis occurs because the arc plasma is cooled especially through the intensive radiation loss caused by high concentration of the metal vapor.

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