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    • 71. 发明专利
      GB454206A A method for producing magnetic powder 未知
    • A method for producing magnetic powder
    • GB454206A
    • 1936-09-25
    • GB279936
    • 1936-01-30
    • VOGT HANS
    • VOGT HANS
    • C22C33/02 , H01F1/22
    • Magnetic powder is produced by mixing particles containing iron with materials containing silicon or aluminium to produce with the iron an alloy of high electric resistance and mechanical hardness, and heating in vacuo or in an inert or reducing atmosphere at a temperature sufficient to effect alloying without substantial sintering. Pure iron, red iron oxide, or iron hydroxide particles may be employed, and the materials containing silicon or aluminium may also contain carbon, boron, titanium, zirconium, thorium, vanadium, antimony, arsenic, phosphorus, or tellurium. Iron hydroxide mixed with 2 to 6 per cent of powdered silicon is heated in a rotary tube furnace for 30 minutes at 600 to 800 DEG C. in a preheated hydrogen current, with 0,5 per cent of chlorine gas as catalyst. The powder is cooled during 12 hours in a hydrogen atmosphere, and then treated in a ball mill. Iron oxide may be heated in hydrogen at 600 to 700 DEG C. in hydrogen for 1 hour, and cooled as above, the reduced powder is ground for 1 to 3 hours with 4 to 6 per cent by weight of silicon, and heated to 500 to 700 DEG C. in a chamber which is preferably evacuated, and a small quantity of chlorine is added as catalyst and the temperature maintained for 30 minutes, after which the powder is cooled over 2 hours. Iron hydroxide mixed with 2 1/2 per cent of silicon is heated in hydrogen with 1 per cent of chlorine for 30 minutes at 600 DEG C. and is cooled over 6 hours. In a further modified form of the process, iron hydroxide is heated to 650 DEG C. in preheated hydrogen to which gaseous silicon tetrachloride acting as a catalyst and from which the silicon is released is added in a quantity to constitute 17 per cent by weight of the hydroxide over 30 minutes, the powder then being treated as above. The heating chamber may be under reduced or increased pressure. Other substances which may be employed as catalysts are silicon-hydrogen compounds, unstable metallic salts not reacting with hydrogen, or acids or their anhydrides such as acetic acid anhydride. Hydrocarbons may be used as grinding agents in the ball mill, and a substance imparting an insulating skin to the particles may be employed. More than 3 per cent of silicon is included in the initial mixture, and preferably 4 to 12 per cent of silicon is diffused into the iron particles. The particles may be of a size from 1/2 to 20 microns, and may be moulded with an insulating binder into cores for wireless coils.ALSO:Magnetic powder, which may be moulded with an insulating binder, unspecified, into cores for wireless coils, is produced by mixing particles containing iron with materials containing silicon or aluminium to produce with the iron an alloy of high electric resistance and mechanical hardness, and heating in vacuo or in an inert or reducing atmosphere at a temperature sufficient to effect alloying without substantial sintering. Pure iron, red iron oxide, or iron hydroxide particles may be employed, and the materials containing silicon or aluminium may also contain carbon, boron, titanium, zirconium, thorium, vanadium, antimony, arsenic, phosphorus, or tellurium. Iron hydroxide mixed with 2 to 6 per cent of powdered silicon is heated in a rotary tube furnace for 30 minutes at 600 to 800 DEG C. in a preheated hydrogen current, with 0,5 per cent of chlorine gas as catalyst. The powder is cooled during 12 hours in a hydrogen atmosphere, and then treated in a ball mill. Iron oxide may be heated in hydrogen at 600 to 700 DEG C. in hydrogen for 1 hour, and cooled as above, the reduced powder is ground for 1 to 3 hours with 4 to 6 per cent by weight of silicon, and heated to 500 to 700 DEG C. in a chamber which is preferably evacuated, and a small quantity of chlorine is added as catalyst and the temperature maintained for 30 minutes, after which the powder is cooled over 2 hours. Iron hydroxide mixed with 2 1/2 per cent of silicon is heated in hydrogen with 1 per cent of chlorine for 30 minutes at 600 DEG C. and is cooled over 6 hours. In a further modified form of the process, iron hydroxide is heated to 650 DEG C. in preheated hydrogen to which gaseous silicon tetrachloride acting as a catalyst and from which the silicon is released is added in a quantity to constitute 17 per cent by weight of the hydroxide over 30 minutes, the powder then being treated as above. The heating chamber may be under reduced or increased pressure. Other substances which may be employed as catalysts are siliconhydrogen compounds, unstable metallic salts not reacting with hydrogen, or acids or their anhydrides such as acetic acid anhydride. Hydrocarbons may be used as grinding agents in the ball mill, and a substance imparting an insulating skin to the particles may be employed. More than 3 per cent of silicon is included in the initial mixture, and preferably 4 to 12 per cent of silicon is diffused into the iron particles. The particles may be of a size from 1/2 to 20 microns.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 72. 发明专利
      GB438612A Improvements in and relating to cores for high frequency coils 未知
    • Improvements in and relating to cores for high frequency coils
    • GB438612A
    • 1935-11-20
    • GB1644034
    • 1934-06-01
    • VOGT HANS
    • VOGT HANS
    • H01F1/24 , H01F1/26 , H01F41/02
    • 438,612. Injection moulding. VOGT, H., 10, Garystrasse, Dahlem, Berlin. June 1, 1934, No. 16440. Convention date, June 1, 1933. [Class 87 (ii)] [See also Group XXXVI] Magnetic cores for high-frequency purposes are made by squirting a mixture of magnetic powder and a thermoplastic binder through a perforated plate into a mould, the core being cooled while in the mould and then ejected. Cores of pot-shape, U-shape or E-shape may be constructed. An electrically heated cylinder 7 contains the mixture 14 which is forced through holes in a plate 17 by a plunger 8, the mould 16 being detachable and the formed core being ejected by a member 18 held in position by a pin 19. The temperature of the mixture is regulated by variable resistances and the bridge circuit 13, the moulding operation being effected at a lower temperature. The mould may have an exciting coil producing a strong magnetic field in the direction of the highfrequency field when the core is subsequently in use, and it may be provided with a cooling jacket.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 74. 发明专利
      FR773813A  未知
    • FR773813A
    • 1934-11-26
    • FR773813D
    • 1934-05-30
    • VOGT HANS
    • VOGT HANS
    • H01F1/24 , H01F1/26 , H01F41/02
    • 438,612. Injection moulding. VOGT, H., 10, Garystrasse, Dahlem, Berlin. June 1, 1934, No. 16440. Convention date, June 1, 1933. [Class 87 (ii)] [See also Group XXXVI] Magnetic cores for high-frequency purposes are made by squirting a mixture of magnetic powder and a thermoplastic binder through a perforated plate into a mould, the core being cooled while in the mould and then ejected. Cores of pot-shape, U-shape or E-shape may be constructed. An electrically heated cylinder 7 contains the mixture 14 which is forced through holes in a plate 17 by a plunger 8, the mould 16 being detachable and the formed core being ejected by a member 18 held in position by a pin 19. The temperature of the mixture is regulated by variable resistances and the bridge circuit 13, the moulding operation being effected at a lower temperature. The mould may have an exciting coil producing a strong magnetic field in the direction of the highfrequency field when the core is subsequently in use, and it may be provided with a cooling jacket.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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