摘要:
W-type ferrite has improved magnetic properties, in particular, coercive force. A high coercive force (HcJ) and a high residual magnetic flux density (Br) can be simultaneously attained by a ferrite magnetic material comprising an oxide having a composition wherein metal elements Sr, Ba and Fe in total have a composition ratio represented by the formula Sr(1−x)BaxFe2+aFe3+b in which 0.03 ≦x≦0.80, 1.1≦a≦2.4, and 12.3≦b≦16.1. The ferrite magnetic material can form any of a ferrite sintered magnet, a ferrite magnet powder, a bonded magnet as a ferrite magnet powder dispersed in a resin, and a magnetic recording medium as a film-type magnetic phase. As for the ferrite sintered magnet, there can be attained a fine sintered structure that has a mean grain size of 0.6 μm or less.
摘要:
There is provided a process for producing W-type ferrite having high magnetic properties by reducing compacting defects during wet compacting. Specifically, there is a provided a process for producing a ferrite sintered body having a main composition of the following formula (1): AFe2+aFe3+bO27 . . . (1) wherein 1.5≦a≦2.1, 14≦a+b≦18.5, and A is at least one element selected from Sr, Ba and Pb, the process comprising:a calcining step of obtaining a calcined body from a raw material compound; a first milling step of milling the calcined body to a predetermined size; a heat treatment step of holding fine powder obtained from the first milling step for a predetermined time in a predetermined temperature range in an atmosphere having an oxygen concentration of 10% by volume or less; a second milling step of milling the fine powder which has undergone the heat treatment step to a predetermined size; a step of wet compacting the fine powder which has undergone the second milling step in a magnetic field; and a sintering step of sintering the compacted body obtained by the wet compacting.
摘要翻译:提供了通过在湿式压实中减少压实缺陷来制造具有高磁特性的W型铁氧体的方法。 具体地说,提供了一种具有下式(1)的主要组成的铁氧体烧结体的方法:AFe2 + aFe3 + bO27。 。 。 (1)其中1.5 <= a <= 2.1,14 <= a + b <= 18.5,A是选自Sr,Ba和Pb中的至少一种元素,该方法包括:煅烧步骤,从 原料化合物; 将煅烧体研磨成预定尺寸的第一研磨步骤; 在氧浓度为10体积%以下的气氛中,将从第一研磨工序得到的细粉保持规定时间的规定温度范围的热处理工序; 将经过热处理步骤的细粉末研磨成预定尺寸的第二研磨步骤; 在磁场中湿式压实经过第二研磨步骤的细粉末的步骤; 以及烧结通过湿式压实获得的压实体的烧结步骤。
摘要:
A dielectric ceramic composition having a main ingredient including a dielectric oxide expressed by the formula {(Me1-xCax)O}m.(Zr1-yTiy)O2, where the symbol Me indicating the name of the element in said formula is at least one of Sr, Mg, and Ba and where the symbols m, x, and y indicating the molar ratios of the formulation in the formula are in relationships of 0.995≦m
摘要翻译:一种电介质陶瓷组合物,其具有主要成分,其包含由式((I 1至X 2)x O)m表示的电介质氧化物。 (Zr 1-y Ti)Y O 2其中表示所述式中的元素的名称的符号Me是以下中的至少一个: Sr,Mg和Ba,其中表示式中制剂的摩尔比的符号m,x和y的关系为0.995 <= m <1.020,0
摘要:
There is provided a soft magnetic member comprising a resin film 11 and a soft magnetic layer formed on the resin film 11, the soft magnetic layer comprising a T-L composition layer 7, wherein T is Fe or FeCO, and L is at least one element selected from the group consisting of C, B and N, and a Co based amorphous alloy layer 3 formed on either of the surfaces of the T-L composition layer 7. The Co based amorphous alloy layer 3 is combined with the T-L composition layer 7 to give a magnetic thin film for high frequency simultaneously exhibiting a high permeability and a high saturated magnetization. The magnetic thin film for high frequency can be formed on the resin film 11 because the magnetic thin film can exhibit excellent properties without a high-temperature heat treatment.
摘要:
There is provided a Mn—Zn based ferrite member excellent in mass productivity, high in withstand voltage, low in loss and excellent in direct current superposition property. The Mn—Zn based ferrite member is provided with a surface layer portion having the properties that ρ5 defined in the specification satisfies the relation that ρ5≧103 Ωm and ρ50 defined in the specification satisfies the relation that ρ50≦102 Ωm. ρ5: (R0−R1)S/L5 (Ωm) ρ50: (R2−R3)S/L50 (Ωm)
摘要:
By using a DM (discontinuous multilayer) structure formed of ferromagnetic metal in amorphous state and amorphous metal different from the ferromagnetic metal, a magnetic thin film for high frequencies is realized that has a high magnetic permeability in a high-frequency region of a GHz band and that has a high saturated magnetization. This magnetic thin film for high frequencies is preferably provided so that: (i) the ferromagnetic metal is predominantly composed of Fe or FeCo and contains one or more elements selected from the group of C, B, and N and the amorphous metal is a Co-base amorphous alloy; and (ii) the amorphous metal is CoZrNb.
摘要:
The present invention provides a production method of a ferrite material comprising as main constituents Fe2O3: 62 to 68 mol %, ZnO: 12 to 20 mol %, and MnO substantially constituting the balance, wherein the method comprises a compacting step for obtaining a compacted body by using a powder containing the main constituents, the powder having a specific surface area falling within a range between 2.5 and 5.0 m2/g and a 90% particle size of 10 μm or less, and a sintering step for sintering the compacted body obtained in the compacting step. Accordingly, the saturation magnetic flux density of the Mn—Zn based ferrite can be improved.
摘要翻译:本发明提供一种铁氧体材料的制造方法,其主要成分为Fe 2 O 3:62〜68摩尔%,ZnO:12〜20摩尔%,MnO 基本上构成天平,其中该方法包括通过使用含有主要成分的粉末获得压实体的压实步骤,所述粉末的比表面积在2.5-5.0μm之间的范围内, / g,90%的粒径为10μm以下,烧结工序用于烧结在压实工序中得到的压实体。 因此,能够提高Mn-Zn系铁氧体的饱和磁通密度。
摘要:
There is provided a sintered body at least 80% of which is constituted of a Y-type hexagonal ferrite. The sintered body contains, as main components, a cobalt oxide, a copper oxide, an iron oxide and AO (AO is at least one of BaO or SrO) in predetermined amounts in mol %, more preferably contains MO (MO is at least one of NiO, ZnO or MgO) in a predetermined amount in mol % in addition to the above components, and also contains, as additional components, bismuth oxide (Bi2O3), borosilicate glass, borosilicate zinc glass or bismuth glass in predetermined amounts in wt %. Thus, a sintered body which exhibits good magnetic properties and is usable up to a high frequency band ranging from several hundred megahertz to gigahertz, contains as few hetero phases other than a Y-type hexagonal ferrite as possible and can be calcined at a temperature of not higher than 1,000° C., particularly about 900° C., and a high-frequency circuit component using the sintered body can be provided.
摘要:
A radio wave absorbent which comprises, as a main component, a manganese-nickel-copper-zinc system ferrite comprising 2.0 to 14.5 mol % of nickel oxide, 3.5 to 17.0 mol % of copper oxide, 30.0 to 33.0 mol % of zinc oxide, 0.5 to 10.0 mol % of manganese oxide, and 40.0 to 50.5 mol % of iron oxide. By virtue of the above-mentioned composition, the radio wave absorbent of the present invention is advantageous not only in that the reflectivity in a wide frequency band of from a low frequency is -20 dB or less, but also in that the matching thickness is small, thus enabling lowering of the production cost.