44results about How to "Increase heat treatment temperature" patented technology

The invention belongs to the field of preparation of metallic soft magnetic materials, and particularly relates to a preparation method for a mu75 magnetic powder core of soft magnetic ferrosilicon aluminum, which includes steps of smelting, rough smashing, heat treatment, fine smashing, annealing treatment, powder grading, powder insulating, compression molding, secondary heat treatment and coating treatment and requires components, by weight, 9.10% of silicon, 5.95% of aluminum and the rest iron. The preparation is performed with the smelting temperature of 1600 DGE C, the compression molding pressure ranging from 1700MPa to 2000Mpa, magnetic powder core pressing temperature ranging from 600 DEG C to 800 DEG C, and one hour for warm keeping in a nitrogen-oxygen mixed atmosphere. The magnetic powder core mu=75+-6 at 100kHz, the magnetic conductivity mu is smaller than 1% in variation under 1000kHz, the magnetic powder core loss is accordant to Pcv (powder loss) 50kHZ/50mT<=100Mw/cm3, and the direct-current bias magnetic field is not lower than 70Oe when the magnetic conductivity is reduced to 50%. The preparation method for the mu75 magnetic powder core of soft magnetic ferrosilicon aluminum has the advantages that added binder is solid organic binder, the heat treatment after molding includes keeping warm for one hour in the nitrogen-oxygen mixed atmosphere, and the prepared magnetic powder core is free of pulverization, high in strength and stable in performance and has fine direct current bias characteristics, frequency stability and low loss.

The invention relates to a multilayer-coated soft magnetic composite material and a preparation method thereof. The composite material is of a core-shell structure, iron-based alloy powder is taken asa core, and a passivation layer and an Al2O3 coating layer are sequentially coated on the surface of the iron-based alloy powder. The preparation method comprises the following steps: performing reaction on the iron-based alloy powder in passivation solution, so that powder A is obtained; preparing Al2O3 colloid; performing ball-milling reaction on the powder A and the Al2O3 colloid; and performing high temperature calcining on the powder subjected to ball milling, so that a multilayer-coated soft magnetic composite material with high magnetic permeability and low loss is obtained. Compared with the prior art, the multilayer-coated soft magnetic composite material provided by the invention has the advantages that high-resistivity insulating substances are coated for multiple layers, so that magnetic loss of the composite material is relatively low under high frequency application condition, and an insulated coating layer which is better in uniformity and has the thickness capable of being accurately controlled can be obtained; and Al2O3 sol-gel has strong heat stability, density of magnetic powder can be improved to the utmost extent, and magnetic permeability of the magnetic powder is improved.

To provide a glass for an information recording media substrate, which is excellent in weather resistance. A glass for an information recording media substrate, which comprises, as represented by mol % based on oxide, from 61 to 66% of SiO2, from 11.5 to 17% of Al2O3, from 8 to 16% of Li2O, from 2 to 8% of Na2O, from 2.5 to 8% of K2O, from 0 to 6% of MgO, from 0 to 4% of TiO2 and from 0 to 3% of ZrO2, provided that Al2O3+MgO+TiO2 is at least 12%, and Li2O+Na2O+K2O is from 16 to 23%, wherein in a case of where B2O3 is contained, its content is less than 1%. The above glass for an information recording media substrate, wherein when the glass is left under steam atmosphere at 120 DEG C. at 0.2 MPa for 20 hours, and the amount of Li, the amount of Na and the amount of K, which precipitate on a surface of the glass are represented as CLi, CNa and CK respectively, CNa is at most 0.7 nmol/cm2, and CLi+CNa+CK is at most 3.5 nmol/cm2.

The invention discloses an Al-Fe-Cu-Zr series aluminum alloy for cables for coal mines and an aluminum alloy cable. The aluminum alloy contains the ingredients in percentage by weight: 0.2-1.1% of Fe, 0.01-0.4% of Cu, 0.001-0.2% of Zr, 0-0.1% of Si, 0-0.2% of B, 0.001-0.15% of one element selected from Ca, Ni, Ti and Zn and the balance of Al and impurities. The aluminum alloy cable is produced through enabling the aluminum alloy to be subjected to the processes of melting, casting and rolling, so as to obtain aluminum alloy rods, then, carrying out drawing, stranding and softening, so as to form aluminum alloy wire cores, and then, carrying out extruded insulation, cabling and extruded sheathing or armoring on the conductor wire cores. The Al-Fe-Cu-Zr series aluminum alloy for the cables for the coal mines, disclosed by the invention, has the characteristics of high strength, high conductivity, good bending property and the like; the aluminum alloy cable produced from the aluminum alloy can meet the requirements on the properties of the cable in the field of the coal mines.

The invention provides a high-performance bonded rare earth permanent magnet powder and a preparation method thereof. Raw material compositions and the preparation method of the rare earth permanent magnet powder are as follows: an alloyed casting strip, the composition ratio of which is R1-xNdx8 to 20MyFebalB4 to 12(atm%), is prepared to be high-performance bonded anisotropic magnet powder through a heat treatment (or untreated process), a hydrogenation and dehydrogenation process and fragmentation. The preparation method comprises the following steps: a rare-iron-boron alloyed casting strip is prepared through a strip casting process, the thickness of the rare-iron-boron alloyed casting strip is 0.1 mm to 1.0 mm; and finally the bonding rare earth permanent magnet powder with high coercive force and high oxidation resistance are prepared through the processes of hydrogenation and dehydrogenation. Compared with the magnet powder taking the traditional cast ingot as the raw material, the bonded magnet powder has higher magnetism property and higher oxidation resistance property.

The invention provides an insulating coating method and a metal powder core prepared with the same. The insulating coating method is characterized by mixing high-temperature organic insulating coating agent with nano oxide at the proportion of 0.01-8 percent by weight. The insulating coating method can improve the heat treatment temperature of the metal powder core by over 50 DEG C, reduce the loss by over 50mW/cm3 and ensure that the three-point bending strength is over 5Mpa.

The invention discloses a two-phase region heat treatment process for a ferritic stainless steel hot rolled strip. According to two-phase region heat treatment process for the ferritic stainless steelhot rolled strip, the ferritic stainless steel hot rolled strip is subjected to multiplex heat treatment in a temperature interval of a ferrite and austenite two-phase region, then a cold-rolling annealing process same as a conventional process for annealing a hot rolled strip by a bell-type furnace is adopted, cold rolling is performed to achieve a same thickness, and annealing and heat preservation are performed to obtain a sufficient recrystallized structure. Through the reversible phase change and recrystallization in the two-phase region heat treatment process, a strip-shaped structure in the original hot rolled strip can be effectively segmented and crushed, the plasticity of the hot rolled strip is improved, good raw material conditions are created for subsequent cold rolling and continuous annealing, and the formability and crease resistance of a final cold rolled strip are improved.

The invention discloses an aging strengthening heat treatment method for nickel-based alloy GH4169. The method comprises full solution treatment and a two-stage aging treatment process. A nickel-basedalloy GH4169 material is subjected to the full solution treatment by preserving the heat for 1 to 3 hours at 980 to 1,070 DEG C; the two-stage aging treatment process comprises first-stage aging treatment, namely, rising the temperature of the nickel-based alloy GH4169 material to 730 to 780 DEG C at the speed of 150 to 200 DEG C/h and preserving the heat for 12 to 18 hours; and second-stage aging treatment, namely, cooling the nickel-based alloy GH4169 material to 630 to 680 DEG C at the speed of 55 DEG C/h and preserving the heat for 18 to 25 hours, discharging the nickel-based alloy GH4169material out of a furnace, and performing air-cooling to room temperature. According to the aging strengthening heat treatment method for the nickel-based alloy GH4169, the tensile strength and yieldstrength of the nickel-based alloy GH4169 at room temperature can be remarkably improved; the hardness at the room temperature is obviously improved; the comprehensive performance of the material isobviously improved; and the service life of the material is obviously prolonged.

The invention provides an Sm-Co-based permanent-magnet thin film high in film-base binding force. A buffer layer is arranged between the Sm-Co-based permanent-magnet thin film and a base body and is of a two-layer structure, one layer is a copper thin film layer positioned on the surface of the base body while the other layer is a tungsten thin film layer positioned on the surface of the copper thin film layer, and binding force between the Sm-Co-based permanent-magnet thin film and the base body can be improved effectively. Experiments verify that heat treatment temperature of the Sm-Co-based permanent-magnet thin film of the structure during heat treatment can be increased substantially from 600-800 DEG C currently to above 900 DEG C, and the Sm-Co-based permanent-magnet thin film can still be well bound with the base body and cannot shed when the heat treatment temperature is as high as 1000 DEG C.

The invention relates to a method for manufacturing a low-resistance protective layer of a chip-type thin-film fixed resistor. A uniform SiO2 protective film layer is deposited on a nickel-chromium resistor body film layer by using a SiO2 target material radio frequency sputtering method. The invention greatly improves the stability and reliability of the product; it significantly improves the use of the product in the harsh environment of high temperature and high humidity; the welding resistance of the product sputtered with Taiwan's low-resistance target material is significantly improved; Improve the consistency of low-resistance heat treatment, increase the heat treatment temperature, and have no effect on the positive and negative TCR of the product, which can be within ±5ppm/°C, so this method can be applied to products with a temperature characteristic of thin film resistance of ±5ppm/°C , so that the TCR qualification rate of the low-resistance segment of the chip film fixed resistor has been greatly improved, and the delivery efficiency of the product has been improved.

The invention discloses a resistance card for a direct-current lightning arrester, which is made of twelve raw materials, namely Bi2O3, Sb2O3, Co2O3, MnCO3, NiO, ZrO2, Al(NO3)3, B2O3, a binding agent, a dispersing agent, a defoaming agent and ZnO. The resistance card adopts a novel formula system and a novel production process; elemental compositions which are added are less; the process is simple; the cost is low; the internal structure of the resistance card is more stable and uniform, thereby greatly improving various performances of age resistance, the stability of current surge, thermal conductivity, square wave through-flow capacity and the like; the requirements of various direct-current lightning arresters can be met completely; the various direct-current lightning arresters can be achieved to be universal; an alternating-current lightning arrester and the direct-current lightning arrester are achieved to be universal; the capacity is large; the pressure ratio is small; the allowable chargeability is high; and the resistance card for the direct-current lightning arrester has an enough safety margin.

The invention discloses a cuprous oxide film with high photoelectrochemical performance and a preparation method thereof. The preparation method comprises the following steps: preparing a deposition solution by taking a soluble copper salt, a lactate solution and a sodium hydroxide solution as raw materials; utilizing a tri-electrode electrochemical tank to perform film deposition on conductive glass; inserting a tri-electrode into the deposition solution to keep the temperature for 30 minutes at 50-70 DEG C; adjusting the pH value to be 9.0-12.0 and controlling deposition time for 20-60 minutes; cleaning and drying the obtained film; and performing carbon removal treatment on the film for one hour under a ventilating condition at 120-150 DEG C, and annealing and sintering the film for 2 hours at 250-400 DEG C. The prepared cuprous oxide film is uniform, compact and free of cracks, and has higher photoelectrochemical performance.