The Foundation: the Research Institute of Electric and Magnetic Alloys

The Research Institute of Electric and Magnetic Alloys

Hakaru Masumoto

Yuetsu Murakami

Naoji Nakamura

Showhachi Sawaya

Masakatsu Hinai

Kiyoshi Watanabe

A high damping capacity alloy comprising of 0.3-20% by weight of Si and the remainder of Al and, as the case may be, further comprising of 0.1-50% by weight in total of at least one subingredient of Pb, Sb, Ge, Ce, Ni, Co, Fe, Nb, Zr, Ti, Ca and B, the alloy having a damping capacity of not less than 6.times.10.sup.-3 after cold working with a reduction of area of at least 5%, and a process for producing the same.

High damping capacity alloy and a process for producing the same

A wear-resistant alloy of high permeability having an effective permeabil of at least about 3,000 at 1 KHz, a saturation magnetic flux density of at least about 4,000 G, and a recrystallization texture of {110}&lt;112&gt;+{311}&lt;112&gt; is provided. The alloy is produced by cold working a forged or hot worked ingot of an alloy of a desired composition at a cold working ratio of at least about 50%, heating the cold worked alloy at a temperature which is below the m.p. of the alloy and not less than about 900.degree. C. and cooling the heated alloy from a temperature which is not less than an order-disorder transformation point (about 600.degree. C.) of the alloy. Alternatively, the alloy is produced by reheating the cooled alloy to a temperature which is not over than the order-disorder transformation point, and cooling the reheated alloy.

Wear-resistant alloy of high permeability and methods of producing the

A wear-resistant alloy of high permeability having an effective permeabil of at least about 3,000 at 1 KHz, a saturation magnetic flux density of at least about 4,000 G, and a recrystallization texture of {110}&lt;112&gt;+{311}&lt;112&gt; is provided. The alloy is produced by cold working a forged or hot worked ingot of an alloy of a desired composition at a cold working ratio of at least about 50%, heating the cold worked alloy at a temperature which is below the m.p. of the alloy and not less than about 900.degree. C., and cooling the heated alloy from a temperature which is not less than an order-disorder transformation point (about 600.degree. C.) of the alloy. Alternatively, the alloy is produced by reheating the cooled alloy to a temperature which is not over than the order-disorder transformation point, and cooling the reheated alloy.

Wear-resistant alloy of high permeability and method of producing the

The disclosed alloy has a temperature coefficient of electric resistance h an absolute value smaller than 100 ppm/.degree.C. in a temperature range between the order-disorder transformation point and melting point thereof, which alloy is made by molding an alloy consisting of 59.0-88.0 wt. % of palladium and the remainder of iron with a small amount of impurities, quenching the molded alloy from a temperature between the above-mentioned order-disorder transformation point and melting point to room temperature, cold working the quenched alloy for shaping, and annealing the shaped alloy.

Alloy with small change of electric resistance over wide temperature

A high damping capacity alloy comprising of 0.1-95% by weight of Zn and the remainder of Al and, as the case may be, further comprising of 0.1-50% by weight in total of at least one subingredient of Sn, Pb, Sb, Ce, Cu Ta, Ni, Co, Fe, Nb, Zr, Si, Ti, Ca and B, the alloy having a damping capacity of not less than 6.times.10.sup.-3 after cold working with a reduction of area of at least 5%, and a process for producing the same.

High damping capacity aluminum alloy

The disclosed magnetic alloy essentially consists of 60-86% of nickel (Ni), .5-14% of niobium (Nb), 0.001-5% in sum of at least one element selected from the group consisting of gold, silver, platinum group elements, gallium, indium, thallium, strontium, and barium, and the balance of iron with a trace of impurities, which alloy renders magnetic properties suitable for recording-and-reproducing head upon specific heat treatment.

Magnetic alloy for magnetic recording-reproducing head

The disclosed alloy has a temperature coefficient of electric resistance with an absolute value smaller than 100 ppm/.degree.C. in a temperature range between the order-disorder transformation point and melting point thereof, which alloy is made by molding an alloy consisting of 59.0-88.0 wt. % of palladium and the remainder of iron with a small amount of impurities, quenching the molded alloy from a temperature between the above-mentioned order-disorder transformation point and melting point to room temperature, cold working the quenched alloy for shaping, and annealing the shaped alloy.

An electrical resistant alloy for use in a sensing coil having a small temperature dependence of electric resistance over a wide temperature range and a method of producing the same are disclosed. This alloy consists of 55.5 to 60.6 wt % of palladium and 44.5 to 39.4 wt % of silver and an inevitable amount of impurities, and has a temperature coefficient of electric resistance of .+-.20.times.10.sup.-6 /.degree.C. over a temperature range of -50.degree. C. to +730.degree. C.

Electrical resistant alloys having a small temperature dependence of

A magnet alloy useful for a magnetic recording and reproducing head consist f by weight of 70 to 86% of nickel, more than 1% and less than 14% of niobium, and 0.001 to 3% of beryllium as main ingredients and 0.01 to 10% of total amount of subingredients selected from the group consisting of not more than 8% of molybdenum, not more than 7% of chromium, not more than 10% of tungsten, not more than 7% of titanium, not more than 7% of vanadium, not more than 10% of manganese, not more than 7% of germanium, not more than 5% of zirconium, not more than 2% of rare earth metal, not more than 10% of tantalum, not more than 1% of boron, not more than 5% of aluminum, not more than 5% of silicon, not more than 5% of tin, not more than 5% of antimony, not more than 10% of cobalt and not more than 10% of copper, a small amount of impurities and the remainder iron and having initial permeability of more than 3,000, maximum permeability of more than 5,000, and Vickers hardness of more than 130.

Magnet alloy useful for a magnetic recording and reproducing head and a

The disclosed permanent magnet has a coercive force of 500 Oe or more, a idual magnetic flux density of 5 kG or more, and a maximum energy product of 2 MG. Oe or more. The magnet alloy consists essentially of platinum and iron, and has an initial state of homogeneous dispersion of .gamma..sub.1 phase of face-centered tetragonal type in a .gamma. phase matrix of face-centered cubic type. To produce the magnet, the alloy is heated at 900.degree. to 1,400.degree. C. for 1 minute to 100 hours for homogenizing solid solution treatment, and quenched in water or in air at a rate of 30.degree. C./minute to 2,000.degree. C./second.

Permanent magnet having ultra-high coercive force and large maximum

Electrical resistant article having a small temperature dependence of

A method for producing a high damping capacity alloy comprising 0.1-10% by eight of at least one of W, Si and Ti and the remainder of Fe and, further comprising 0.01-45% in total, as a subingredient, of at least one of Cr, Al, Sb, Nb, V, Ta, Sn, Zn, Zr, Cd, Gd, Ga, P, Au, Ag, Ge, Sm, Se, Ce, La, Bi, Pt, Pd, Be, Mg, Re, Rh, Y, Pb, As, B, Eu and S, comprising the steps of

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Sendai, Japan

Hakaru Masumoto