56 results about "Sendust" patented technology

A metallic magnetic material for magnetic element for magnetic element of a choke coil and an SMD choke power coil for accommodating low voltage and high current in a personal computer, graphic card, high frequency power supply, etc, is prepared by baking a powder of Fe—Si—Al alloy sendust, obtained by an atomization process and having an average particle diameter of 10 to 70 μm, at 600° C. to 1000° C. in air or in an oxidizing atmosphere and mixing the baked sendust with 3 to 45 wt % of a carbonyl iron powder with an average particle diameter of 1 to 10 μm. The metallic magnetic material for magnetic element according to the present invention is used in a coil-embedded SMD power choke coil having a square or rectangular shape with a height of 1 mm to 7 mm and with a length of one side being 3 mm to 13 mm.

The invention relates to the technical field of electromagnetic wave absorption, and provides a preparation method of a sendust electromagnetic wave absorbent. The preparation method comprises the steps: manganese zinc ferrite and sendust alloy powder are mixed to be ball-milled, wherein the ratio of milled materials to milling media is 1:(14 to 16), and ball milling is conducted for 5-50 h; and then drying is conducted to obtain the sendust electromagnetic wave absorbent, wherein the manganese zinc ferrite accounts for 0.5-5at% of the sendust electromagnetic wave absorbent, and the manganesezinc ferrite is prepared from the components in percentage by atom: 52-55% of Fe2O3, 33-36% of MnO and 10-14% of ZnO. According to the preparation method, the manganese zinc ferrite is doped in the sendust alloy powder with the reasonable content, and the reasonable ball milling time is selected in the mixed ball milling process of the manganese zinc ferrite and the sendust alloy powder, so that the prepared sendust electromagnetic wave absorbent has a good absorption effect on electromagnetic waves. The invention further provides the sendust electromagnetic wave absorbent prepared through thepreparation method. The sendust electromagnetic wave absorbent has good absorption performance on the electromagnetic waves.

A unit block for a core using soft magnetic metal powder, a core having excellent high-current DC bias characteristics using the unit block, and a method of producing the core are disclosed. The unit block is used to produce cores applied to an active filter for PFC, a three-phase line reactor, or an inductor for automotive electronics. A method of producing the core comprises mixing sendust alloy, High Flux, MPP, or silicon steel powders, which have an average particle size of 175 gm or less, with a solid lubricant; compacting a mixture at a pressure of 10 - 18 tons per unit area; heat-treating the compacted mixture at 600 - 800'C for 1 - 2 hours to form the unit blocks each having a length of 3 - 10 cm, a width of 1 - 5 cm, and a height of 1 - 5 cm; and attaching the unit blocks using a heat- and fire-resistant adhesive.

The present invention provides a novel complex thermal insulation and heat preservation structure, the structure has from inside to outside a subbase, a thermal insulation and heat preservation layer, a strengthening and crack-resistant layer, a thermal reflecting decorative layer. The thermal insulation and heat preservation layer is formed with complex powder material A and polystyrene bubble particle B, the complex powder material A has 50-80% concrete, 10-40% sendust glass hollow ball material having specific surface area of 400-5000 m[2] / kg, air entraining agent 0.005-0.05%, modifying agent 1-5%, water reducing agent 0.2-1.2%, fiber 0.1-5%, tackifier 0.5-2%, the strengthening and crack-resistant layer is coagulated with thermal galvanization steel wire net and modifying crack-resistant base body of fiber strengthening polymer, the wire net is hung and fixed on the thermal insulation and heat preservation layer with plastic expanding bolt, the thermal reflecting decorative layer is made of tint glazed ceramic wall tile or glass, aluminium alloy, stainless steel curtain wall material. The structure apparently improves the thermal insulation and heat preservation ability, and effectively resolves the problem of crack, gaul, and drop of the tile, also greatly improves the wear ability and construction efficiency.