Aluminum coated steel pipe material with brazing filler metal
The invention provides an aluminum coated steel pipe material with brazing filler metal, which can solve the problems that the production cost is high, and the processing difficulty is high for producing straight cold air coolers by the existing aluminum coated steel pipes. The aluminum coated steel pipe material with brazing filler metal comprises carbon steel as a core material and a skin material; the skin material and the core material are combined and connected. The aluminum coated steel pipe material with brazing filler metal is characterized in that the skin material comprises an aluminum alloy brazing filler metal layer and a connecting layer which are connected in a hot rolling and bonding mode, and the connecting layer and the surface of the core material are combined.
Introduction It is well known that Ni catalysts are very useful for many catalytic reactions. But the size of Ni particles on catalyst is typically 20-100 nm and the preparing the smaller Ni particles on the support is desired. Colloidal metal particles have been expected as a superior catalyst precursor for supported solid catalyst because of their small particle size and the narrow size distribution. In this study, we prepared Ni metal colloid by using tBuONa as a stabilizer and used for the Ni catalyst precursor. Non-porous SiO2 as well as meso-porous SiO2 (HMS) were used as the support. The supported Ni catalysts were reduced by hydrogen and were characterized by XAFS analysis.