92 results about "Oxygen balance" patented technology

Carbon nanostructures are synthesized from carbon-excess explosives having a negative oxygen balance. A supercritical fluid provides an environment that safely dissolves and decomposes the explosive molecules into its reactant products including activated C or CO and provides the temperature and pressure for the required collision rate of activated C atoms and CO molecules to form carbon nanostructures such as graphene, fullerenes and nanotubes. The nanostructures may be synthesized without a metal reactant at relatively low temperatures in the supercritical fluid to provide a cost-effective path to bulk fabrication. These nanostructures may be synthesized “metal free”. As the supercritical fluid provides an inert buffer that does not react with the explosive, the fluid is preserved. Once the nanostructures are removed, the other reaction products may be removed and the fluid recycled.

The invention relates to a secondary refining production method of super-clean high-carbon chromium bearing steel, which comprises the steps of performing processes of KR (Kanbara reactor), BOF (basicoxygen furnace), RS (Rhein Stahl) process, LF (ladle furnace), RH (Ruhrstahl Heraeus) process, CC (continuous casting), and rolling; carrying out further control, to be specific, (1) allowing final sulfur content of hot metal from KR hot metal pretreatment to be < / =0.005%; (2) performing BOF oxygen decarburization, allowing final carbon content to be 0.15-0.80%, adding aluminum of 0.5 kg / t and above into molten steel during tapping according to an aluminum-oxygen balance chart so that oxygen content in tapped steel is dropped to 30 ppm and below, and controlling tapping temperature to 1600-1700 DEG C; (3) after tapping of BOF converter smelting, performing RS slag scraping, and removing slag in a ladle completely; (4) adding refining slag for LF refining, controlling free CaO molecular percent to 40-60% in the refining slag, controlling aluminum content in steel to 0.03-0.07%, controlling oxygen content upon tapping to 10 ppm and below, and allowing tapping temperature to be 1550-1610DEG C; (5) performing argon stirring the whole RH vacuum degassing process, and holding the vacuity of 100 Pa and below for 10 min and longer. The method of the application has the advantages of highefficiency, low cost, and low energy consumption; steel refined via the method is super clean.

The invention relates to a method for growing a Ce<3+> doped lutetium yttrium silicate scintillation crystal. The method is characterized by comprising the concrete steps of (1) weighing and mixing; (2) pressing and sintering; (3) heating for fusing; (4) seeding; (5) high temperature oxygen diffusion; (6) necking, shoulder extending and keeping constant-diameter; (7) cooling; (8) in-situ annealing. According to the invention, a crystal growth furnace is properly modified, so that high-temperature oxygen diffusion and in-situ annealing at a reducing atmosphere can be simultaneously realized, oxygen balance can also be realized, and furthermore, the crystal is not easy to crack and become yellow and the good crystal quality is kept. The success rate for growing the crystal is increased from 40-45% to 75-85%.