CA1045423A - Nickel base magnetic alloy - Google Patents
Nickel base magnetic alloyInfo
- Publication number
- CA1045423A CA1045423A CA219,304A CA219304A CA1045423A CA 1045423 A CA1045423 A CA 1045423A CA 219304 A CA219304 A CA 219304A CA 1045423 A CA1045423 A CA 1045423A
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- Prior art keywords
- magnetic
- alloy
- coercive force
- weight percent
- flux density
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14708—Fe-Ni based alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dispersion Chemistry (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
- Magnetic Heads (AREA)
Abstract
MAGNETIC ALLOY
ABSTRACT
A magnetic alloy which is superior in wear resistance, smaller than 0.07 Oersted in coercive force Hc, greater than 6000 Gausses in magnetic flux density B10 (B10 being the magnetic flux density at 10 Oe.), greater than 4000 in initial permeability µo and greater than 60 µo-cm in specific resistance ? and which is preferred for use with the material of the core of a magnetic head.
ABSTRACT
A magnetic alloy which is superior in wear resistance, smaller than 0.07 Oersted in coercive force Hc, greater than 6000 Gausses in magnetic flux density B10 (B10 being the magnetic flux density at 10 Oe.), greater than 4000 in initial permeability µo and greater than 60 µo-cm in specific resistance ? and which is preferred for use with the material of the core of a magnetic head.
Description
~.0~54Z3 BACKGROUND OF THE INVENTION
Field of the Invention This invention relates generally to a magnetic alloy, and more particularly to a soft magnetic alloy for use with a magnetic head.
Description of the Prior Art Hitherto, a Permalloy Q which is a magnetic alloy high in permeability has been widely used as the core material of a magnetic head. The Permalloy ~ is superior in magnetic characteristics but is bad in wear resistance. A magnetic head made of Permalloy ~ is much abraded when used for recording and/or reproducing on and/or from a magnetic tape which used powders of chromium dioxide (CrO2) as magnetic powders and has been widely used recently, so that the magnetic head can not only be used for a long time period but also is changed in electric characteristics as a magnetic head during the use.
To avoid the above defects, a magnetic alloy which is improved in wear resistance and magnetic characteristics, for example, iron-nickel alloy including niobium and tungsten or iron-nickel alloy including germanium has been proposed.
However, these magnetic alloys are difficult in heat treatment or bad in magnetic characteristics and wear resistance.
Accordingly, such a magnetic alloy has not been used generally.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a magnetic alloy which is superior in wear resistance, smaller than 0.07 Oersted in coercive force Hc, greater than 6000 Gausses in magnetic flux density Blo (Blo being the magnetic flux density at 10 Oe.), greater than 4000 in initial perme-ability ~O and greater than 60~ ~ -cm in specific resistance f and which is preferred for use with the material of the core -1- ~
1045~23 of a magnetic head.
It is another object of this invention to provide a magnetic alloy which is easily manufactured and good in rolling property.
It is a further object of this invention to provide a magnetïc alloy which is preferred for use with a magnetic shielding material.
In accordance with the foregoing objects, theee is provided a magnetic quintuple alloy consisting essentially of, on a 10~ weight percent basis, between 79 and 85 weight percent nickel; between 3 and 6 we~ght percent chromium; between 0.01 ahd 1 weight percent germanium; between 0.8 and 6 weight percent manganese; and the rest of iron.
The other objects, features and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DR~WINGS
Figure 1 is a compositmon diagram of a quadruple or quaternary alloy Ni75Fe25 x yCrxGey(cooling treatment in a furnace);
Figure 2 is a composition diagram of a quadruple alloy Ni75Fe25_x_yCrxGey (rapid cooling treatment);
Figure 3 is a composition diagram of a quadruple alloy Ni80Fe20 x yCrxGey (cooling treatment in a furaace);
Figure 4 is a composition diagr-am of a quadruple alloy Ni85Fel5 x yCexGey ~cooling treatment in a furnace);
Figure 5 is a composition diagram of a quadruple alloy Ni85Fel5_x_yCrxGey (rapid cooling treatment);
Figure 6 is a graph showing static magnetic character-istics of a quintuple alloy Ni80Fel3.5_~Cr4Ge2.5Mn~;
Figure 7 is a graph showing static magnetic character-istics of a quintuple alloy Ni80Fel5~ Cr4GelMn~;
Figure 8 is a graph showing static magnetic character-istics of a quintuple alloy Ni80Fel5.5~Cr4 ~ 5 Figure 9 is a graph showing static magnetic character-istics of a quintuple alloy Ni8oFel4.5-~cr5Geo.5Mn~;
Figure 10 is a graph showing static magnetic character-istics of a quintuple alloy Ni80~el4-~cr5GelMn~;
Figure 11 is a graph showing static magnetic character-istics of a quadruple alloy Ni80Fel6-~cr4GeoMn~;
. Figures 12, 13 and 14 are diagrams showing the results of abrasion tests of the magnetic materials according to the present invention and a prior art Permalloy; and Figure 15 is a graph showing the permeability fre-quency characteristics of the magnetic material of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to the drawings, the static magnetic characteristics, specific resistance, hardness and wear resistance of the magnetic material according to this invention will be now described.
Figure 1 is a composition diagram showing the coercive force Hc, magnetic flux density Blo (magnetic flux density at 10 Oersteds), initial permeability ~0 and specific resistance ~ of a so-called quadruple alloy Ni75Fe25 x yCrxGey at the respective com-positions, which is obtained by finally annealing the quadruple alloy with cooling treatment in a furnace and in which comprises 75 weight percent of nickel (Ni) constant, x weight percent of chromium (Cr), Y weight percent of germanium (Ge) and balance iron (Fe), and Figure 2 is a composition diagram showing the coercive force Hc, initial permeability ~0 and Vicker's hardness Hv of a similar quadruple alloy Ni75Fe25 x yCrxGey at the respective compositions the final annealing of which is carried out rapidly. The numerical values in Figure 1 indicate Hc, Blo, ~0~5423 ~0 and /, respectively, from above to belo~, and the numerical values in Figure 2 Hc, ~ and Hv, respectively, from above to below.
Figure 3 is a composition diagram showing the coercive force Hc, magnetic flux density Blo, initial permeability ~0 and specific resistance f of a so-called quadruple alloy Ni80Fe20 x yCrxGey at the respective compositions, which is subjecte~ to a furnace cooli`ng treatment or cool~ng treatment in a furnace. The numerical values in Figure 3 indicate Hc, Blo, ~0 and ~, respectively, from above to below.
Figure 4 is a composition diagram showing the coercive force Hc, magnetic flux density Blo initial permeability ~0 and specific resistance ~ of a so-called quadruple alloy Ni85Fel5 x yCrxGey at respective compositions, which is subjected to a furnace cooling treatment at final annealing process and which comprises 85 weight percent of Ni, constant, x we~ght percent of Cr, y ~eight percent of Ge and balance Fe, respect~
iuely. Figure 5 is a composition diagram showing the coercive force Hc and initial permeability ~0 of a similar quadruple alloy Ni85Fel5 x yCrxGey, which is subjected to rapid cooling treatment at final annealing. The numerical values in Figure 4 indicate Hc, Blo, ~0 and f from above to below, and those in Figure 5 Hc and ~0 from above to below, respectively.
Figure 6 is a graph showing the coercive force Hc, magne~ic flux density Blo and initial permeability ~0 of a so-called quintuple alloy Ni80Fel3 5 ~Cr4~e2 5Mn~, at respective compositions, which comprises 80 weight percents of Ni, 4 weight percents of Cr, 2.5 weight percents of Ge (which are constant), the adding amount ~ of manganese ~Mn~ being varied and balanced Fe, and Figures 7 to 10 are graphs, similar to Figure 6, showing the coercive force Hc, magnetic flux density Blo and initial permeability ~0 of similar quintuple alloys lV45423 Ni Fel5 ~Cr4GelMn~ Ni80Fel5.5-~Cr4G 0-5 N 8oFel4~5-~cr5Geo.5Mn~l N~8oFel4-~cr5GelMn~l respect~vely.
Figure 11 is a graph showing above three magnetic characteristics, Hc, Blo and ~0 of a quadruple magnetic alloy Ni80Fel6 ~Cr4GeOMn~ (which does not contain germanium).
The next table I shows effective permeability of typical composition~ of this invention, comparative composition which does not contain Ge and prior ar~ Permalloy, measured at the frequency 1 XHz, lOKHz, lOOKHz.
Table I
EExample Composition Effective permi Ibility ~ KHZ 10 KHz 100 KHZ
1 80Ni4Cr2 5Gel.9Mnll.6Fe 40000 7350 1440
Field of the Invention This invention relates generally to a magnetic alloy, and more particularly to a soft magnetic alloy for use with a magnetic head.
Description of the Prior Art Hitherto, a Permalloy Q which is a magnetic alloy high in permeability has been widely used as the core material of a magnetic head. The Permalloy ~ is superior in magnetic characteristics but is bad in wear resistance. A magnetic head made of Permalloy ~ is much abraded when used for recording and/or reproducing on and/or from a magnetic tape which used powders of chromium dioxide (CrO2) as magnetic powders and has been widely used recently, so that the magnetic head can not only be used for a long time period but also is changed in electric characteristics as a magnetic head during the use.
To avoid the above defects, a magnetic alloy which is improved in wear resistance and magnetic characteristics, for example, iron-nickel alloy including niobium and tungsten or iron-nickel alloy including germanium has been proposed.
However, these magnetic alloys are difficult in heat treatment or bad in magnetic characteristics and wear resistance.
Accordingly, such a magnetic alloy has not been used generally.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a magnetic alloy which is superior in wear resistance, smaller than 0.07 Oersted in coercive force Hc, greater than 6000 Gausses in magnetic flux density Blo (Blo being the magnetic flux density at 10 Oe.), greater than 4000 in initial perme-ability ~O and greater than 60~ ~ -cm in specific resistance f and which is preferred for use with the material of the core -1- ~
1045~23 of a magnetic head.
It is another object of this invention to provide a magnetic alloy which is easily manufactured and good in rolling property.
It is a further object of this invention to provide a magnetïc alloy which is preferred for use with a magnetic shielding material.
In accordance with the foregoing objects, theee is provided a magnetic quintuple alloy consisting essentially of, on a 10~ weight percent basis, between 79 and 85 weight percent nickel; between 3 and 6 we~ght percent chromium; between 0.01 ahd 1 weight percent germanium; between 0.8 and 6 weight percent manganese; and the rest of iron.
The other objects, features and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DR~WINGS
Figure 1 is a compositmon diagram of a quadruple or quaternary alloy Ni75Fe25 x yCrxGey(cooling treatment in a furnace);
Figure 2 is a composition diagram of a quadruple alloy Ni75Fe25_x_yCrxGey (rapid cooling treatment);
Figure 3 is a composition diagram of a quadruple alloy Ni80Fe20 x yCrxGey (cooling treatment in a furaace);
Figure 4 is a composition diagr-am of a quadruple alloy Ni85Fel5 x yCexGey ~cooling treatment in a furnace);
Figure 5 is a composition diagram of a quadruple alloy Ni85Fel5_x_yCrxGey (rapid cooling treatment);
Figure 6 is a graph showing static magnetic character-istics of a quintuple alloy Ni80Fel3.5_~Cr4Ge2.5Mn~;
Figure 7 is a graph showing static magnetic character-istics of a quintuple alloy Ni80Fel5~ Cr4GelMn~;
Figure 8 is a graph showing static magnetic character-istics of a quintuple alloy Ni80Fel5.5~Cr4 ~ 5 Figure 9 is a graph showing static magnetic character-istics of a quintuple alloy Ni8oFel4.5-~cr5Geo.5Mn~;
Figure 10 is a graph showing static magnetic character-istics of a quintuple alloy Ni80~el4-~cr5GelMn~;
Figure 11 is a graph showing static magnetic character-istics of a quadruple alloy Ni80Fel6-~cr4GeoMn~;
. Figures 12, 13 and 14 are diagrams showing the results of abrasion tests of the magnetic materials according to the present invention and a prior art Permalloy; and Figure 15 is a graph showing the permeability fre-quency characteristics of the magnetic material of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to the drawings, the static magnetic characteristics, specific resistance, hardness and wear resistance of the magnetic material according to this invention will be now described.
Figure 1 is a composition diagram showing the coercive force Hc, magnetic flux density Blo (magnetic flux density at 10 Oersteds), initial permeability ~0 and specific resistance ~ of a so-called quadruple alloy Ni75Fe25 x yCrxGey at the respective com-positions, which is obtained by finally annealing the quadruple alloy with cooling treatment in a furnace and in which comprises 75 weight percent of nickel (Ni) constant, x weight percent of chromium (Cr), Y weight percent of germanium (Ge) and balance iron (Fe), and Figure 2 is a composition diagram showing the coercive force Hc, initial permeability ~0 and Vicker's hardness Hv of a similar quadruple alloy Ni75Fe25 x yCrxGey at the respective compositions the final annealing of which is carried out rapidly. The numerical values in Figure 1 indicate Hc, Blo, ~0~5423 ~0 and /, respectively, from above to belo~, and the numerical values in Figure 2 Hc, ~ and Hv, respectively, from above to below.
Figure 3 is a composition diagram showing the coercive force Hc, magnetic flux density Blo, initial permeability ~0 and specific resistance f of a so-called quadruple alloy Ni80Fe20 x yCrxGey at the respective compositions, which is subjecte~ to a furnace cooli`ng treatment or cool~ng treatment in a furnace. The numerical values in Figure 3 indicate Hc, Blo, ~0 and ~, respectively, from above to below.
Figure 4 is a composition diagram showing the coercive force Hc, magnetic flux density Blo initial permeability ~0 and specific resistance ~ of a so-called quadruple alloy Ni85Fel5 x yCrxGey at respective compositions, which is subjected to a furnace cooling treatment at final annealing process and which comprises 85 weight percent of Ni, constant, x we~ght percent of Cr, y ~eight percent of Ge and balance Fe, respect~
iuely. Figure 5 is a composition diagram showing the coercive force Hc and initial permeability ~0 of a similar quadruple alloy Ni85Fel5 x yCrxGey, which is subjected to rapid cooling treatment at final annealing. The numerical values in Figure 4 indicate Hc, Blo, ~0 and f from above to below, and those in Figure 5 Hc and ~0 from above to below, respectively.
Figure 6 is a graph showing the coercive force Hc, magne~ic flux density Blo and initial permeability ~0 of a so-called quintuple alloy Ni80Fel3 5 ~Cr4~e2 5Mn~, at respective compositions, which comprises 80 weight percents of Ni, 4 weight percents of Cr, 2.5 weight percents of Ge (which are constant), the adding amount ~ of manganese ~Mn~ being varied and balanced Fe, and Figures 7 to 10 are graphs, similar to Figure 6, showing the coercive force Hc, magnetic flux density Blo and initial permeability ~0 of similar quintuple alloys lV45423 Ni Fel5 ~Cr4GelMn~ Ni80Fel5.5-~Cr4G 0-5 N 8oFel4~5-~cr5Geo.5Mn~l N~8oFel4-~cr5GelMn~l respect~vely.
Figure 11 is a graph showing above three magnetic characteristics, Hc, Blo and ~0 of a quadruple magnetic alloy Ni80Fel6 ~Cr4GeOMn~ (which does not contain germanium).
The next table I shows effective permeability of typical composition~ of this invention, comparative composition which does not contain Ge and prior ar~ Permalloy, measured at the frequency 1 XHz, lOKHz, lOOKHz.
Table I
EExample Composition Effective permi Ibility ~ KHZ 10 KHz 100 KHZ
1 80Ni4Cr2 5Gel.9Mnll.6Fe 40000 7350 1440
2 80Ni4Crl 25GeO.9Mnl3.85Fe 37200 6550 1350
3 80Ni4CrO.9Mnl5.lFe 30500 588a 1270 (not containing Ge)
4 81Ni4Cr2 5Gel.9MnlO.6Fe 34200 6800 1400 80Ni5Mol5Fe 28200 1 4770 9SO
In the table I, Examples 1,2, and 4 are the compositions of this invention.
As may be apparent from Figures 1 to 11 and Table I, the static and dynamic magnetic characteristics, specific resistance, hardness and so on of the quintuple alloy NiFeCrGeMn according to this invention depend upon the composition rate thereof.
As to the static magnetic characteristics, if the amount of Ni is selected low or 75 weight percents, the coercive force Hc especially increases, but the initial permeability ~0 decreases to deteriorate the magnetic characteristics as a whole, as shown in Figures 1 and 2. As shown in Figure 3 or 4 and Figure 5, if the adding amount of Ni is selected high or 80 or 85 weight percents, the coercive force Hc decreases, but the initial permeability ~0 increases to improve the magnetic characteristics as a whole.
Figures 1 and 4 are the graphs showing the magnetic characteristics of the alloys subjected to ~he furnace cccling treatment at the final annealing which is desired from a practical point of view, but Figures 2 and 5 are the graphs showing the magnetic characteristics of the alloys subjected to the rapid cooling treatment which generally avoids the form-ation of magnetic anisotropy. As may be apparent from Figures 1, 2, 4 and 5, if Cr is added more than by weight percent of 2 to 3, the coercive force Hc decreases and the formation of magnetic anisotropy is avoided irrespective of the furnace cooling treatment and rapid cooling treatment. Accordingly, the magnetic material of this invention can be finally annealed by the furnace cooling which is easy in heat treatment.
As to the specific resistance, it may be obvious from ~igures 1 and 4 that the proper resistance increases in accor~
dance with the addition of Cr to thereby decrease the eddy current loss of the magnetic material.
As to the hardness, it may be o~vious from the Vicker's hardness shown in Figure 2 that the hardness becomes high by the addition of Ge and Cr, respectively. And also, it is noted that the magneto-striction and magnetic anisotropy decrease and the reproduceability of magnetic characteristics is imp~oved by addition of Ge.
Further, as shown in the Table I, the effective permeability increases in accordance with the addition of germanium (Ge).
The composition, which has good magnetic characteristics exists at the side where Ge is added about 0.5 weight percents and at the side where Cr is added large (4 to 5 weight percents) as shown in Figure 3. In this case, it is noted that the former is high in magnetic flux density and hardness, and the latter is improved in wear resistance by addition of Cr.
Refering now to Figures 6 to 11, by adding Mn to the quadruple alloy NiFeCrGe, the coercive force Hc further decreases but the initial permeability ~0 increases to improve the magnetic characteristics, on account of deoxidation effect of Mn. Further the rolling property of the magnetic material is improved by adding Mn thereto.
It s desired as a magnetic material used for a magnetic head that its coercive force Hc is in ~he vioinity of O.07 oersteds or s~aller than it, its magnetic flux density Blo is more than 6000 Gausses, its initial permeability ~0 is greater than 4000 and its specific resistance f is greater than 60 ~Q-cm.
If the foregoing is taken in account, it is preferred in this invention that in the quintupl~ alloy NiFeCrGeMn the amount of Ni is selected 79 to 85 weight percents and that of Cr 2 to 6 weight percents, respectively. When the adding amount of Cr is smaller than 2 weight percents, the coercive force Hc increases and th~ wear resistance is deteriorated, while when greater than 6 weight percents, the magnetic flux density Blo is deteriorated.
The adding amount of Ge is preferred to be selected in the range of 0.01 to 5 weight percents. When the adding amount of Ge is selected smaller than 0.01 weight percent, the improved characteristics in effective permeability can't be obtained, while when greater than 5 percents, the coercive force Hc increases and Ge is deposited instead of being replaced.
The adding amount of Mn is preferred to be in the range of 0.5 to 6 weight percents. When the adding amount of Mn is greater than 6 weight percents, the magnetic flux density Blo is deteriorated and magnetic anisotropy becomes great, while when
In the table I, Examples 1,2, and 4 are the compositions of this invention.
As may be apparent from Figures 1 to 11 and Table I, the static and dynamic magnetic characteristics, specific resistance, hardness and so on of the quintuple alloy NiFeCrGeMn according to this invention depend upon the composition rate thereof.
As to the static magnetic characteristics, if the amount of Ni is selected low or 75 weight percents, the coercive force Hc especially increases, but the initial permeability ~0 decreases to deteriorate the magnetic characteristics as a whole, as shown in Figures 1 and 2. As shown in Figure 3 or 4 and Figure 5, if the adding amount of Ni is selected high or 80 or 85 weight percents, the coercive force Hc decreases, but the initial permeability ~0 increases to improve the magnetic characteristics as a whole.
Figures 1 and 4 are the graphs showing the magnetic characteristics of the alloys subjected to ~he furnace cccling treatment at the final annealing which is desired from a practical point of view, but Figures 2 and 5 are the graphs showing the magnetic characteristics of the alloys subjected to the rapid cooling treatment which generally avoids the form-ation of magnetic anisotropy. As may be apparent from Figures 1, 2, 4 and 5, if Cr is added more than by weight percent of 2 to 3, the coercive force Hc decreases and the formation of magnetic anisotropy is avoided irrespective of the furnace cooling treatment and rapid cooling treatment. Accordingly, the magnetic material of this invention can be finally annealed by the furnace cooling which is easy in heat treatment.
As to the specific resistance, it may be obvious from ~igures 1 and 4 that the proper resistance increases in accor~
dance with the addition of Cr to thereby decrease the eddy current loss of the magnetic material.
As to the hardness, it may be o~vious from the Vicker's hardness shown in Figure 2 that the hardness becomes high by the addition of Ge and Cr, respectively. And also, it is noted that the magneto-striction and magnetic anisotropy decrease and the reproduceability of magnetic characteristics is imp~oved by addition of Ge.
Further, as shown in the Table I, the effective permeability increases in accordance with the addition of germanium (Ge).
The composition, which has good magnetic characteristics exists at the side where Ge is added about 0.5 weight percents and at the side where Cr is added large (4 to 5 weight percents) as shown in Figure 3. In this case, it is noted that the former is high in magnetic flux density and hardness, and the latter is improved in wear resistance by addition of Cr.
Refering now to Figures 6 to 11, by adding Mn to the quadruple alloy NiFeCrGe, the coercive force Hc further decreases but the initial permeability ~0 increases to improve the magnetic characteristics, on account of deoxidation effect of Mn. Further the rolling property of the magnetic material is improved by adding Mn thereto.
It s desired as a magnetic material used for a magnetic head that its coercive force Hc is in ~he vioinity of O.07 oersteds or s~aller than it, its magnetic flux density Blo is more than 6000 Gausses, its initial permeability ~0 is greater than 4000 and its specific resistance f is greater than 60 ~Q-cm.
If the foregoing is taken in account, it is preferred in this invention that in the quintupl~ alloy NiFeCrGeMn the amount of Ni is selected 79 to 85 weight percents and that of Cr 2 to 6 weight percents, respectively. When the adding amount of Cr is smaller than 2 weight percents, the coercive force Hc increases and th~ wear resistance is deteriorated, while when greater than 6 weight percents, the magnetic flux density Blo is deteriorated.
The adding amount of Ge is preferred to be selected in the range of 0.01 to 5 weight percents. When the adding amount of Ge is selected smaller than 0.01 weight percent, the improved characteristics in effective permeability can't be obtained, while when greater than 5 percents, the coercive force Hc increases and Ge is deposited instead of being replaced.
The adding amount of Mn is preferred to be in the range of 0.5 to 6 weight percents. When the adding amount of Mn is greater than 6 weight percents, the magnetic flux density Blo is deteriorated and magnetic anisotropy becomes great, while when
5~23 smaller than 0.5 ~ei~ht percents, improved characteristics in permeabil~ty and coerc~ve force can~t De obtained.
Further, ~t is des~red as a magnetic material used for magnetic head which is passed by the magnetic tape using CrO2 as magnetic powder, that ~he material should have magnetic flux density Blo greater than 6400 Causses to avoid the head core being saturated by the high coercive force of Cr~2. If the foregoing is taken in account, it is preferred in hhis invention that in the quintuple alloy NiF~CrGeMn, the amount of Ni should be selected 79 to 85 weight percents, that of Cr 3 to 6 weight percents, that of Ge 0.01 to 1 weight percents, and that of Mn 0.8~6 weight percents, respectively.
Figures 12 and 13 are diagrams showing the results of abrasion tests of the typical composition of the invention, that is the quintuple alloy Ni80Felocrs.5Ge2Mn2.5 P
the prior art Permalloy. Figure 12 shows abraded amounts dl and d2 of dummy cores, which are formed by laminating a plurality of cQres each with thickness of 0.145 mm, when an ordinary magnetic tape is travelled in contact with the dummy cores at a speed of l9cm/sec for 234 hours (where the magnetic tape is replaced with a new one at every 50 hours). In Figure 12 reference numeral 1 designates a contact surface of the dummy core with which the tape does not yet contact or reference sur-face, reference numeral 2 an abraded contact surface of the dummy cores formed of the magnetic material of ~his invention after tests, and reference numeral 3 an abraded contact surface of the dummy ~ore~s formed of the prior art Permalloy after tests.
Figure 13 shows abraded amounts dl and d2 of dummy cores which are formed by laminating a plurality cores each having a thickness of 0.10 mm, when a cassette tape is travelled in contact with the dummy cores at a speed of 4.8cm/sec for 150 hours ~the eassette tape is replaced by new one at every 50 hours). Fig. 14 shows results of abrasion test of anohher typical composition of the invention, that is, Ni80FellCr5GeO 5Mn3 as compared with the prior art Permalloy, tested in the same condition as case of Fig. 13. In Figures 13 and 14, reference numerals correspond-ing to those used in Fig. 12 indicate the corresponding sur-faces, respectively. From Figures 12, 13 and 14 it will be apparent that the magnetic material according to this invention is superior in wear resistance.
Figure 15 is a graph showing the permeability-fre-quency characteristics of the typical composition of this invention or quintuple alloy Ni80FellCr4Ge2 5Mn2 5 in a thin plate in which the ordinate represents the permeability ~ and the abscissa the frequency f in KHz, respectively. From the graph of Figure 15, it will be noted that the permeability-frequency characteristics are superior, and the magnetorestriction and the magnetic anisotropy are both s~all. In Figure 15, a line a shows the frequency characteristic of the magnetic material in the form of a thin plate with a thickness of O.lOmm and a line b that with a thickness of 0.15 mm.
As may be apparent from the above description, ac-cording to this invention there is obtained the magnetic material, which is superior in static magnetic characteristics and wear resistance and has high proper resistance, and also is easy in rolling, so that the magnetic material of this invention is effective for use with a magnetic recording and reproducing head for a magnetic tape with chromium dioxide tCrO2) and with high coercive force or for use with a shi~ld case.
It will be apparent that many modifications and variations could be made by those skilled in the art without departing from the spirits and scope of the novel concepts of this invention.
_g_
Further, ~t is des~red as a magnetic material used for magnetic head which is passed by the magnetic tape using CrO2 as magnetic powder, that ~he material should have magnetic flux density Blo greater than 6400 Causses to avoid the head core being saturated by the high coercive force of Cr~2. If the foregoing is taken in account, it is preferred in hhis invention that in the quintuple alloy NiF~CrGeMn, the amount of Ni should be selected 79 to 85 weight percents, that of Cr 3 to 6 weight percents, that of Ge 0.01 to 1 weight percents, and that of Mn 0.8~6 weight percents, respectively.
Figures 12 and 13 are diagrams showing the results of abrasion tests of the typical composition of the invention, that is the quintuple alloy Ni80Felocrs.5Ge2Mn2.5 P
the prior art Permalloy. Figure 12 shows abraded amounts dl and d2 of dummy cores, which are formed by laminating a plurality of cQres each with thickness of 0.145 mm, when an ordinary magnetic tape is travelled in contact with the dummy cores at a speed of l9cm/sec for 234 hours (where the magnetic tape is replaced with a new one at every 50 hours). In Figure 12 reference numeral 1 designates a contact surface of the dummy core with which the tape does not yet contact or reference sur-face, reference numeral 2 an abraded contact surface of the dummy cores formed of the magnetic material of ~his invention after tests, and reference numeral 3 an abraded contact surface of the dummy ~ore~s formed of the prior art Permalloy after tests.
Figure 13 shows abraded amounts dl and d2 of dummy cores which are formed by laminating a plurality cores each having a thickness of 0.10 mm, when a cassette tape is travelled in contact with the dummy cores at a speed of 4.8cm/sec for 150 hours ~the eassette tape is replaced by new one at every 50 hours). Fig. 14 shows results of abrasion test of anohher typical composition of the invention, that is, Ni80FellCr5GeO 5Mn3 as compared with the prior art Permalloy, tested in the same condition as case of Fig. 13. In Figures 13 and 14, reference numerals correspond-ing to those used in Fig. 12 indicate the corresponding sur-faces, respectively. From Figures 12, 13 and 14 it will be apparent that the magnetic material according to this invention is superior in wear resistance.
Figure 15 is a graph showing the permeability-fre-quency characteristics of the typical composition of this invention or quintuple alloy Ni80FellCr4Ge2 5Mn2 5 in a thin plate in which the ordinate represents the permeability ~ and the abscissa the frequency f in KHz, respectively. From the graph of Figure 15, it will be noted that the permeability-frequency characteristics are superior, and the magnetorestriction and the magnetic anisotropy are both s~all. In Figure 15, a line a shows the frequency characteristic of the magnetic material in the form of a thin plate with a thickness of O.lOmm and a line b that with a thickness of 0.15 mm.
As may be apparent from the above description, ac-cording to this invention there is obtained the magnetic material, which is superior in static magnetic characteristics and wear resistance and has high proper resistance, and also is easy in rolling, so that the magnetic material of this invention is effective for use with a magnetic recording and reproducing head for a magnetic tape with chromium dioxide tCrO2) and with high coercive force or for use with a shi~ld case.
It will be apparent that many modifications and variations could be made by those skilled in the art without departing from the spirits and scope of the novel concepts of this invention.
_g_
Claims
OR PRIVILEGE IS CLAIMED, ARE DEFINED AS FOLLOWS:
1. A magnetic quintuple Ni, Fe, Cr, Ge, Mn alloy consisting essentially of, on a 100 weight percent basis, between 79 and 85 weight percent nickel; between 3 and 6 weight percent chromium; between 0.01 and 1 weight percent germanium;
between 0.8 and 6 weight percent manganese; and the rest of iron.
between 0.8 and 6 weight percent manganese; and the rest of iron.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1474774A JPS5629368B2 (en) | 1974-02-05 | 1974-02-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1045423A true CA1045423A (en) | 1979-01-02 |
Family
ID=11869693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA219,304A Expired CA1045423A (en) | 1974-02-05 | 1975-02-04 | Nickel base magnetic alloy |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5629368B2 (en) |
| CA (1) | CA1045423A (en) |
| DE (1) | DE2503412C2 (en) |
| FR (1) | FR2259911B1 (en) |
| GB (1) | GB1494563A (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE516696C (en) * | 1925-08-25 | 1931-01-26 | Electrical Res Prod Inc | A material containing nickel and iron for magnetic purposes, in which the nickel content is 75 to 83% of the total alloy, and in which an increased initial permeability is produced by heat treatment |
| US3264100A (en) * | 1962-11-07 | 1966-08-02 | Hitachi Ltd | Magnetic materials with high permeability |
| DE2146755C3 (en) * | 1971-09-18 | 1980-11-13 | Fried. Krupp Gmbh, 4300 Essen | Use of an iron-nickel-based alloy for the production of soft magnetic objects |
| JPS5134369B2 (en) * | 1971-10-13 | 1976-09-25 |
-
1974
- 1974-02-05 JP JP1474774A patent/JPS5629368B2/ja not_active Expired
-
1975
- 1975-01-28 DE DE19752503412 patent/DE2503412C2/en not_active Expired
- 1975-01-30 GB GB413175A patent/GB1494563A/en not_active Expired
- 1975-02-04 CA CA219,304A patent/CA1045423A/en not_active Expired
- 1975-02-05 FR FR7503612A patent/FR2259911B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1494563A (en) | 1977-12-07 |
| FR2259911A1 (en) | 1975-08-29 |
| FR2259911B1 (en) | 1981-04-30 |
| JPS5629368B2 (en) | 1981-07-08 |
| DE2503412A1 (en) | 1975-08-07 |
| DE2503412C2 (en) | 1985-10-03 |
| JPS50109495A (en) | 1975-08-28 |
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