35results about How to "Optimizing the drawing process" patented technology

The invention discloses a preparation method of a high-resistance electrothermal alloy wire, and relates to the iron chromium aluminum alloy processing and manufacturing field. The preparation method includes five technological processes of blank preparation, annealing treatment, alkali washing, cleaning and wiredrawing treatment; in the annealing treatment process in the preparation method, through strict control of the heating temperature and the holding time of a box type resistance furnace, the internal organization of a nickel-chromium alloy wire is improved, the plasticity is increased, and the subsequent drawing technology is facilitated; in the alkali washing process, through well control of the temperature and time of alkali washing, an oxidation film of the surface of the nickel-chromium alloy wire is removed relatively thoroughly, the impurity residual amount is precious little, and the surface is smooth; and the nickel-chromium alloy wire prepared by the preparation method has high-temperature oxidation resistance greatly improved, has the advantages of high electrical resistivity, high mechanical strength under high temperature conditions, long service life, simple production process, and easy realized automation production.

The invention provides a crystal growth apparatus and a crystal growth method. The crystal growth apparatus comprises a furnace body, a crucible, a cooling sleeve and a guide cylinder, wherein the cooling sleeve is arranged in the furnace body and cools a crystal; the guide cylinder is arranged on the periphery of the cooling sleeve; the guide cylinder comprises an upper guide cylinder part and alower guide cylinder part, the upper guide cylinder part is cylindrical and surrounds the cooling sleeve, the lower guide cylinder part is arranged at the lower end of the upper guide cylinder part and located on the lower side of the cooling sleeve, the lower guide cylinder part is of a hollow big-end-up circular truncated cone structure, a groove is formed in the inner circumferential wall of the circular truncated cone structure, and the top of the groove penetrates through the circular truncated cone structure;and the cooling sleeve moves in the axial direction of the crucible. In the growth apparatus, the cooling sleeve moves along the axial direction of the crucible to influence thermal field distribution in the furnace body, and the temperature gradient at a solid-liquid interface can be finely adjusted, so crystals with a certain width and no defect growth area can be drawn, and the problem that the crystals with considerable defects in the growth area are drawn due to the factthat the temperature gradient of the solid-liquid interface is difficult to control in the prior art is solved.

The invention relates to the manufacture of an interface used for the combination of a liquid chromatographic separation system and a mass spectrum, in particular to a manufacturing device of a capillary spray interface used for the combination of liquid chromatogram and the mass spectrum, which comprises a 'U'-shaped bracket, two top ends of the 'U'-shaped bracket are respectively provided with a coaxial transverse sliding chute, hollow adjusting screw rods are respectively arranged in the sliding chutes and can transversely slide along the horizontal direction in the sliding chutes; the inner and outer surfaces of the inner side of the adjusting screw rod are respectively provided with internal screw threads and external screw threads, a PEEK head is screwed on the front end of the adjusting screw rod through the internal screw threads and internally passed by a polytetrafluoroethylene tube or a PEEK tube, an adjusting screw nut is arranged on the external screw threads; the interior of the 'U'-shaped bracket is provided with a high-temperature flame lamp; wherein, the inner chamber of the polytetrafluoroethylene tube or the PEEK tube is used for being sheathed with a quartz capillary. The device has simple manufacturing technology, uses raw materials with low price, and can comparatively and conveniently manufacture ideal mass spectrum spray interfaces with high mission success rate and good uniformity.

The invention provides a preparation method of an ultralow-loss optical fiber, which realizes uniform doping of alkali metal by optimizing a doping process. And meanwhile, the cladding adopts an F-doped technology to reduce the refractive index and optimize the wire drawing process, and finally, the development of ultralow-loss low-water-peak large-effective-area optical fiber products is realized. An optical fiber preform is manufactured in advance, and then the optical fiber preform is drawn to form an optical fiber. The method is characterized in that the manufacturing method of the opticalfiber preform comprises the following steps that: the core rod is prepared in advance through a VAD method; alkali metal neutral salt is used as a raw material in the preparation process of the ultralow-loss alkali-metal-doped optical fiber; an oxygen-enriched carrier gas is introduced into a sintering furnace core tube for alkali metal doping, the temperature in the doping process is controlledto be within the range of 1000-1800 DEG C, the doping time is controlled to be 2-6 hours, and an alkali metal doped core layer is prepared; and by washing the alkali metal doped core layer with hydrofluoric acid for 5-24 hours, the alkali metal doping concentration is 20-200 ppm.

The invention discloses a discrete PO4<3-> ion selective micro electrode and a preparation method thereof. The micro electrode comprises a tubular conical glass tube, wherein one end of the tubular conical glass tube is a conical tip, and the other end of the tubular conical glass tube is a cylindrical end face; a metal wire in middle wound connection penetrates through the tubular conical glass tube; a cobalt wire is arranged at one end of the metal wire in middle wound connection, and a fine copper wire is arranged at the other end of the metal wire; the cobalt wire and the fine copper wire respectively extend out of the conical end and the cylindrical end face of the tubular conical glass tube; the inner part of the tubular conical glass tube is filled with bismuth alloy coated with the cobalt wire and at the winding end; the cylindrical end face of the tubular conical glass tube is closed by an epoxy resin and is fixed with the fine copper wire. The preparation method comprises the following steps: drawing the tubular conical glass tube, etching and mounting the cobalt wire, filling the bismuth alloy and assembling the micro electrode. The spatial distribution characteristics of concentration of phosphate (comprising metaphosphate) inside activated sludge groups and natural water body sediments can be rapidly and continuously measured.

The invention provides a glass optical fiber for neutron detection. The glass optical fiber comprises a fiber core and a cladding tube coating the outer layer of the fiber core, the fiber core is madeof a scintillation material and is used as a scintillator of the neutron detector; and the cladding tube is made of a high-purity quartz material and is used as a scintillator shell of the neutron detector. The scintillation material is prepared into the glass optical fiber so that total reflection of scintillation of activator ions in the fiber core can be realized; when the glass optical fiberis used for neutron and gamma ray detection, the position resolution of thermal neutron detection can be greatly improved, and the glass optical fiber is easy to design and process into various detector structures. The invention also provides a preparation method for preparing the glass optical fiber.

The invention provides a preparation method for an aluminum-clad steel wire. The preparation method for the aluminum-clad steel wire comprises the following steps that oxide skin removing treatment isconducted on carbon steel which is above the 92A level, high-softening point lubricating powder is adopted to conduct surface lubrication, and then the steel wire with the needed wire diameter is acquired through a cold drawing technology; continuous isothermal quenching treatment is conducted on the steel wire, and the heat-treated steel wire with sorbite conversion rate greater than 90 percentand tensile strength greater than 1440 Mpa is acquired; the surface of the heat-treated steel wire is polished, a layer of aluminum is clad on the steel wire through extrusion, and a clad busbar is formed; and multi-pass synchronous drawing is conducted on the clad busbar until the needed wire diameter is acquired, and the aluminum-clad steel wire with tensile strength greater than 2000 Mpa is formed. The provided preparation method for the aluminum-clad steel wire is simple in steps and convenient to operate; the high-softening point lubricating powder is utilized, a rough drawing productiontechnology is optimized, parameters such as the total compression ratio and the pass compression ratio are adjusted, the aluminum-clad steel wire duplex metal drawing technology is optimized, and theprepared aluminum-clad steel wire has the tensile strength which is above 2000 Mpa.