Inoculants containing Strontium promote graphitization in gray cast iron, reduce white mouth, improve the morphology and distribution of graphite, and refine matrix structure. They are also able to increase the machinability of castings.
Resulf 30 IE is a new and easy to use method of adding controlled amounts of sulfur and oxygen to molten gray or ductile irons. This results in improved inoculant efficiency and substantial reductions in inoculant addition levels.
Strontium occurs in nature combined with other elements and compounds. It is very reactive with air and tarnishes rapidly, causing it to be kept in sealed containers away from other metals. Finely powdered strontium metal spontaneously ignites when exposed to air and forms both strontium oxide and strontium nitride.
It was discovered that strontium added to a silicon-bearing inoculant increased its potency when used with flake graphite grey iron and low alumin nodular graphite cast iron. This improvement is not proportional to the amount of strontium added, but is quite substantial at even very low concentrations of strontium in the inoculant.
It was found that the inoculant of this invention could be made by using a conventional submerged arc furnace to produce a molten bath of ferrosilicon which had been adjusted for calcium to less than 0.3%. To this was added a portion of either the strontium silicide or the strontium metal and, optionally, an aluminum, zirconium-rich material, or both.
Sphere-O-Dox G is a blend of sulfur and oxygen inoculant that is effective in eliminating carbides from ductile iron grades. It has been used successfully at a medium-sized foundry producing thin-section (0.225 in. or less), shell molded castings. Standard inoculation practice resulted in significant carbide formations that required annealing to eliminate. Changing to a sulfur and oxygen enhanced inoculant reduced the carbide count by 20%, and yielded pearlitic ductile iron that was machinable as-cast.
FE-SEM images of the eTuSp1-Dox spheres revealed dense, compact and uniform structures with a low defect density. ATR-FTIR spectra of eTuSp1-Dox showed a primary structure with a high compressive modulus. Using an AFM, local force measurement was performed on a single sphere to determine the compressive force. eTuSp1-Dox displayed superior hemocompatibility in pure PBS and platelet/heparin solution, as well as in vitro hemolysis assay. Moreover, incubation with Hela cells showed that eTuSp1-Dox could efficiently deliver Dox to nuclei in the pH-sensitive release mode.
English
Write a Message