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

The invention provides a method for coating metal magnetic powder on soft magnetic ferrites. According to the method, the metal magnetic powder is mixed with trace micron or submicron soft magnetic ferrites, and then, a coating layer is formed through microwave high-temperature heat treatment. The invention also discloses a method for preparing the metal soft magnetic composite materials by adopting the coating powder. According to the method, the coating powder is subjected to organic matter coating, lubricating agents are added, pressing and forming are carried out, finally, annealing treatment is carried out, and the soft magnetic composite materials are obtained. The method has the advantages that the characteristics of magnetism, high electrical resistivity and high-temperature resistance of ferrite soft magnetic materials are sufficiently used, the two kinds of soft magnetic materials are compounded, non-magnetic substances are less than other kinds of soft magnetic composite materials, and in addition, a higher heat treatment temperature is realized, so that better magnetic performance is realized. The soft magnetic composite materials prepared by adopting the method provided by the invention have higher magnetic conductivity and low loss, the frequency stability is good, the magnetic loss at high frequency is low, in addition, the preparing process is simple, the environment is protected, the operation is easy, the cost is low, and the method is suitable for industrial mass and large-scale production.

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 method for manufacturing mu 125 sendust cores. The method comprises the steps of alloy smelting, coarse crushing, heat treatment, fine crushing, annealing treatment, powder classification, powder insulation, compression moulding, secondary heat treatment and coating treatment. The mu 125 sendust cores comprise the following compositions: 9.10 percent of silicon, 5.95 percent of aluminum and the balance of iron; the sendust cores are smelted at 1,600DEG C, molded under the pressure of between 1,950 and 2,150MPa, subjected to heat treatment at the temperature of between 600 and 800DEG C, kept at the temperature for 30min, and subjected to heat treatment under the protection of nitrogen. The magnetic permeability mu of the sendust cores is equal to 125+ / -10 (10kHz / 1mT); the mu change rate in 1 MHz is less than 5%; Pcv is less than or equal to 190 mW / cm<3> (100kHz / 50mT); and the applied direct current bias field H is not less than 390e when the mu is 50%. A passivating solution does not contain chromium ions, which is environment-friendly; and an insulation layer between powder of the sendust cores has a glass phase structure containing P, which has high temperature for heat treatment and contributes to eliminating internal stress and reducing iron loss. A solid inorganic binder is adopted, so the adhesive strength is high, the performance is stable, and the process is simplified.

The invention discloses a preparation method of near ultraviolet-excited high silica blue-light-emitting glass. The preparation method comprises the steps of: firstly melting borosilicate glass, carrying out acid leaching to obtain large-aperture and intact porous glass after carrying out thermal treatment on split-phase at a higher temperature; dipping the porous glass into solution containing europium ion to soak and dope, and sintering at the high temperature in a reducing atmosphere to obtain the compact high silica blue-light-emitting glass. The glass disclosed by the invention greatly improves the doping concentration of the europium ion under the precondition of keeping the luminous intensity of the near ultraviolet-excited high silica blue light emitting, and facilitates laser excitation. The optimal excitation wavelength of the glass disclosed by the invention is expanded to a range of 350-390nm, so a high-pressure mercury lamp which is relatively safe to a human body and mature in the development and an LED (light-emitting diode) can be utilized as excitation light sources by the improvement, and the safety and convenience in application are improved. Therefore, the preparation method can be applied to the industries such as illumination and decoration and life purposes, and is expected to be a new laser material.