Magnetic material and product thereof

FIELD: powder metallurgy.

SUBSTANCE: invention provides magnetic material expressed by following empiric formula: (Pr1-x1-x2R

1x1
R2x2
)14-20(Fe1-y1Coy1)restB4-10, where R1 is at least one element selected from the group consisting of Tb, Dy, Ho, Er. Tm; R2 is at least one element selected from the group consisting of Sm, La, Ce, Nd, Y; xq = 0.2-0.5; y1=0.2-0.3; x1/x2 ≥5. Material may further contain at least one element selected from the group consisting of Al, Ga, Ti, Nb, Mo, Cu. Such composition enhances magnetic properties and simultaneously temperature stability of material is increased.

EFFECT: increased accuracy and stability of operation of navigation equipment and aircraft automatic system.

3 cl, 1 tbl

 

The invention relates to the field of powder metallurgy, in particular, to magnetic materials for permanent magnets based on rare earth elements with metals of the iron group.

The known magnetic material based on praseodymium, iron, cobalt, aluminum, boron following chemical composition, at.%:

Pr15Fe62,5Co16Al1B5,5Jiang S.Y. and other. Magnetic properties of

R-Fe-B and R-Fe-Co-Al-B magnets (R=Pr and

Nd), J. Appl. Phys., 1988, V.64, No. 10,

R-5512.

The disadvantages of the known magnetic material are not sufficiently high magnetic properties: the value of the coercive force (HCI) is equal to 9.6 EC, the value of the temperature coefficient of induction (TCI) equals -0,085%/° With (field 20÷ 150°).

Products from well-known magnetic material are, for example, prisms, cylinders, ring magnets with radial or axial texture, etc. of the defect are:

- not a high value of HCIthat imposes restrictions on the geometry of the products, especially the ring magnets with radial texture;

- insufficient high temperature stability of the material (high value of TCI, in absolute value), which limits the scope of products in the technique.

The known magnetic material based on neodymium, iron, to which Balta, boron the following chemical composition, at.%:

Nd15(Fe1-xCox)77In8where x=0÷ 0,2 M. Sagawa and other. Permanent

magnet materials based

on the rare earth-iron-boron

tetragonal compounds,

IEEE Trans. on Magnet.,

1984, V.MAG-20, No. 5,

p.1584-1589.

The disadvantages of the known magnetic material are:

not high enough magnetic properties: the value of HCIdoes not exceed 10,3 EC, and the value of TCI≤ -0,074%/°C.

Products from well-known magnetic material are, for example, prisms, cylinders, ring magnets with radial or axial texture, etc. of the defect are:

- not a high value of HCIthat imposes restrictions on the geometry of the products, especially the ring magnets with radial texture;

- insufficient high temperature stability of the material (high value of TCI, in absolute value), which limits the scope of products in the technique.

The closest analogue, taken as a prototype, is a magnetic material containing iron, cobalt, boron, neodymium, terbium, having a composition corresponding to the formula, at.%:

(Nd1-x1-x2bx1Rx2)14-17(Fe1-y1Coy1)75-80TU2In6-8,

where R is at least one element selected from the group dysprosium (Dy), holmium (Ho), erbium (Er), thulium (TM), and the - at least one element selected from the group of aluminum (Al), gallium (Ga), titanium (Ti), niobium (Nb), molybdenum (Mo), and

x1+x2=0,1-0,99

x1/x2≥ 0,10

N1=0,2-0,55

U2=0,01-10 RF Patent No. 2136069.

The disadvantages of magnetic material of the prototype are:

not high enough magnetic properties. For example, when the value of the TCI in the range of 0÷ -0,02%/° (29÷ 100° (C)the amount of the residual induction (R) does not exceed 6 kg.

Products made from magnetic material of the prototype with the value of TCI=0÷ -0,02%/° are different sizes of magnets (e.g., prisms, cylinders, rings with axial texture and so on), except for the ring magnets with radial texture (CMRT). The disadvantages of the products are:

- the impossibility of manufacturing a ring magnet with a radial texture with the value of TCI=0÷ -0,02%/° C. When grinding such KMRT marriage is 100%.

An object of the invention is to increase the magnetic properties of the material while increasing thermal stability; increasing the yield of the magnets when grinding and expanding the range of manufactured products, in particular, the manufacture of annular magnets with radial texture with the value of TCI=0÷ -0,02%/° C.

The technical problem is achieved by the fact that the magnetic material containing iron, cobalt, boron, and ENISA least one element, selected from the group terbium (b), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (TM), which further comprises praseodymium, and at least one element selected from the group samarium (Sm), lanthanum (La), cerium (CE), neodymium (Nd), yttrium (Y), the chemical composition corresponds to the formula, at.%:

(Pr1-x1-x2R

1
x1
R
2
x2
)14-20(Fe1-y1Coy1)the OST.In4-10,

where R1at least one element selected from the group b, Dy, But, Er, Tm, R2at least one element selected from the group of Sm, La, CE, Nd, Y;

x1=0,2-0,5

N1=0,2-0,3

x1/x25

The magnetic material further contains at least one element selected from the group of aluminum (Al), gallium (Ga), titanium (Ti), niobium (Nb), molybdenum (Mo), copper (cu), the chemical composition corresponds to the formula, at.%:

(Pr1-x1-x2R

1
x1
R
2
x2
)14-20(Fe1-y1Coy1) the OST.The2B4-10,

where T is at least one element selected from the group Al, Ga, Ti, Nb, Mo, si;

U2=0,001-6

A product made of the above magnetic material.

The authors found that in the system Pr-R-Fe-Co-B, where R is a heavy rare earth metal, the content of the main magnetic phase (RG, R)2(Fe, Co)14In about 2 times higher than in the system Nd-R-Fe-Co-B (with the same content of other alloying elements), which leads to an increased value of InRmaterial for a given value of TCI. It was also established that in the system Pr-R-Fe-Co-B, when the Co content in the claimed limits, there is no phase (RG, R)1(Fe, Co)4B1. This phase leads to the decrease of the values InRand HCImagnets Nd-R-Fe-Co-Century Established that the presence of phase REM1(Fe,Co)4B1significantly reduces the strength of the magnets, and when the content is above a certain limit is not possible to make the ring magnets with radial texture. It is established that the positive effect of Sm, La, Ce, Nd, Y, and Al, Ga, Ti, Nb, Mo, si in the claimed limits associated with changes in the chemical composition of phases and phase composition of the material.

The example implementation.

The alloy of a given composition were melted in a vacuum induction furnace. Magnets are produced by powder technologies, including: crushing with IDA to a size less than 600 microns, fine grinding in a protective environment to a single-crystal particle size, compaction specimens and samples of ring magnets with radial texture in a magnetic field of 10 and 3.5 kOe, respectively, sintering in a vacuum furnace at a temperature of 1080-1140° C. the Obtained preform specimens were polished to size 10× 10× 10 mm, and billet ring magnets with radial texture to $ 16.5× 12,2× 3,0 mm, the Amount of TCA measured in the region of 20-100° C.

The compositions and properties of the proposed magnetic material and the material of the prototype shown in the table. In examples 1, 2 shows the boundary values of the compounds. In examples 3, 4, 5 - average values of the compositions. Ring magnets with radial texture above a specified size, were also made of material corresponding to the material composition of the prototype. As can be seen from the table, KMRT of the material of the prototype to make impossible (marriage when grinding is 100%). As can be seen from the table, the magnetic properties of the material is much higher than that of the prototype: the value of brabove not less than 23%, and the value of HCl- 27%. In addition, the yield KMRT of the proposed material is not lower than 70%, while all of the radial rings of the material of the prototype when grinding destroyed.

Thus, the proposed magnetic material is ri the value of TCI=0÷ -0,02%/° allows to expand the range of manufactured products, including ring magnets with radial texture, while increasing their magnetic characteristics.

Application of the proposed magnetic material improves the accuracy and stability of operation of the navigation equipment and aviation automation, as well as to produce magnets of any size.

Table

The compositions and properties of the proposed magnetic material and the material of the prototype.
The proposed materialNo.The composition of the magnetic material, at.%Magnetic propertiesThe yield KMPT, %
   InR, kgfHci, CETCI, %/° C 
 1(WG0,76Dy0,17Tb0,03Nd0,02Ce0,01Sm0,01)15(Fe0,7Co0,03)leaveCu5Ti1B97,514,3-0,0275
 2(Pr0,40Dy0,45Ho0,05Nd0,01Sm0,09)17,5(FC0,8Coof 0.2)leaveCR0,0005Al0,0005B 57,420-0,0275
 3(WG0,46Dy0,45Nd0,09)the 15.6(Fe0,72Co0,28)the OST.C2,6Ti0,01B5,28,221070
 4(Pr0,56Dy0,37Tb0,01Ce0,04Sm0,02)14,9(Fe0,75COof 0.25)the OST.Cu1,6Alof 0.2Ti0,28Nbof 0.25B6,2916,3-0,0275
 5(WG0,39Dy0,41Tb0,09But0,01Nd0,04La0,01Sm0,05)15,4(Fe0,75Coof 0.25)leaveC3Ti0,07In5,67,919,2-0,01477
The placeholder(Ndof 0.48Dy0,42b0,10)16,0(Feof 0.65CO0,35)leaveAl0,36In7,4611,3-0,020

1. Magnetic material containing iron, cobalt, boron, and at least one element selected from the group terbium, dysprosium, holmium, erbium, thulium, characterized in that it further comprises praseodymium, and at least one element selected from the group Samar is th, lanthanum, cerium, neodymium, yttrium, the chemical composition corresponds to the formula, at.%:

(Pr1-x1-x2R

1
x1
R
2
x2
)l4-20(Fe1-y1Coy1)the OST.In4-10,

where R1at least one element selected from the group Tb, Dy, But, Er, Tm,

R2at least one element selected from the group of Sm, La, Ce, Nd, Y;

x1=0,2-0,5;

N1=0,2-0,3;

x1/x2≥5.

2. The magnetic material according to claim 1, characterized in that it additionally contains at least one element selected from the group of aluminum, gallium, titanium, niobium, molybdenum, copper, the chemical composition corresponds to the formula, at.%:

(Pr1-x1-x2R

1
x1
R
2
x2
)14-20(Fe1-y1Coy1)the OST.TU2In4-10,

where T is at least one element selected from the group Al, Ga, Ti, Nb, Mo, si;

U2=0,001-6.

3. The product of the magnetic material, the tives such as those it is made of a magnetic material according to any one of claims 1 or 2.



 

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FIELD: powder metallurgy.

SUBSTANCE: invention provides magnetic material expressed by following empiric formula: (Pr1-x1-x2R

1x1
R2x2
)14-20(Fe1-y1Coy1)restB4-10, where R1 is at least one element selected from the group consisting of Tb, Dy, Ho, Er. Tm; R2 is at least one element selected from the group consisting of Sm, La, Ce, Nd, Y; xq = 0.2-0.5; y1=0.2-0.3; x1/x2 ≥5. Material may further contain at least one element selected from the group consisting of Al, Ga, Ti, Nb, Mo, Cu. Such composition enhances magnetic properties and simultaneously temperature stability of material is increased.

EFFECT: increased accuracy and stability of operation of navigation equipment and aircraft automatic system.

3 cl, 1 tbl

FIELD: powder metallurgy; navigation equipment and aircraft automation systems.

SUBSTANCE: proposed magnetic material designed for producing permanent magnets based on rare-earth element with metals of iron group has in its composition iron, cobalt, boron, and at least one element of terbium, dysprosium, holmium, erbium, thulium group, as well as cerium and gadolinium, and at least one element of samarium, lanthanum, neodymium, yttrium, and praseodymium group, formula of this chemical composition being as follow, atom percent: (Ce1 - x1 - x2- x3R1x1 x3R2x2GDx3)14-20(Fe1 - yCoy1)rB4 - 10, where R1 is at least one element of Tb, Dy, Ho, Er, Tm group; R2 is at least one element of Sm, La, Nd, Y, Pr group, where x1 = 0.2 - 0.5; y1 = 0.2 - 0.3, x2 and x3 are chosen considering following conditions: x1 + x2 + x3 = 0.75 - 0.99; x3/x1 ≥ 0.01.

EFFECT: enhanced residual magnetic flux density and temperature stability of material, extended range of magnet sizes.

3 cl, 1 tbl, 5 ex

Steel // 2312921

FIELD: ferrous metallurgy.

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Steel // 2323271

FIELD: ferrous metallurgy.

SUBSTANCE: invention proposes steel comprising the following components, wt.-%: carbon, 0.3-0.8; silicon, 0.2-0.4; manganese, 1.0-2.0; cobalt, 0.5-1.5; aluminum, 0.005-0.015; boron, 0.15-0.25; barium, 0.003-0.008; phosphorus, 0.15-0.25, and iron, the balance. Proposed steel shows enhanced creep limit. Invention can be used in railway machine engineering, automobile manufacture and machine tool manufacture.

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1 tbl

FIELD: technological processes.

SUBSTANCE: invention is related to manufacture of high-strength thin-walled cylindrical shells with wall thickness of less than 0.2 mm. Tubular billet is produced by method of hot pressing from martensite-ageing steel with nickel content of 15-20%. Billet is subjected to thermal treatment by heating up to temperature of 900÷940°C with maintenance at this temperature for 0.8÷1.8 hours and further cooling outside. Repeatedly billet is heated up to temperature of 780÷840°C and maintained at this temperature for 0.7÷1.5 hours and cooled outside. Cutting of billet internal and external surfaces is carried out, then shell rotary extrusion takes place in several preliminary operations and final operation. Thermal treatment for stress relieving after every operation of rotary extrusion is performed at temperature of 800-850°C with maintenance at this temperature for 1÷3 hours and further cooling outside. Best results of method implementation are achieved with application of martensite-ageing steel that contains rare-earth metals.

EFFECT: method allows to increase quality of shells and output of proper produce.

3 cl, 4 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: invention refers to iron and steel metallurgy, particularly to compositions of steel group applied for production of friction pair railroad wheel - railroad rail with wheel moving rate up to 500 km/h. The rail is made out of steel containing carbon, vanadium, cobalt, yttrium, copper, nickel, chromium, manganese, sulphur, phosphorus, aluminium, silicon and iron at the following ratio of components, wt %: carbon 1.20 - 1.35, vanadium 2.0-2.2, cobalt 0.80 - 1.92, yttrium 0.20 - 0.70, copper 0.30 - 0.60, nickel < 0.3; chromium < 0.3, manganese < 0.5, sulphur < 0.035, phosphorus < 0.03, aluminium < 0.01, silicon 0.17 - 0.37, iron - the rest; while the wheel is made out of steel containing carbon, vanadium, yttrium, copper, nickel, chromium, manganese, sulphur, phosphorus, aluminium, silicon and iron at the following ratio of components, wt %: carbon 0.36 - 0.49, vanadium 0.26 - 0.40, yttrium 0.20 - 0.70, copper 1.10 - 1.72, nickel 2.10 - 2.50, chromium < 0.3, manganese < 0.5, sulphur < 0.035, phosphorus < 0.03, aluminium < 0.01, silicon 0.17 - 0.37, iron - the rest.

EFFECT: increased contact-fatigue strength and, as result, reliability and durability of pair wheel-rail.

2 tbl

FIELD: metallurgy.

SUBSTANCE: alloy contains the following, wt %: carbon 0.001 - 0.3, manganese 5.0 - 44.0, nitrogen 0.03 - 0.12, and iron is the rest; at that, its structure contains 5 - 95% of ε-martensite phase, and γ-austenite and/or α-martensite is the rest. Alloy can also contain 0.5 - 8.0 wt % of silicium and/or cobalt and one or several elements of the group: titanium 0.06 - 1.0, vanadium 0.06 - 0.20 and niobium 0.05 - 0.20.

EFFECT: alloy has high damping and antifriction properties, wear resistance and shape memory effect, which allows using it for manufacture of items having the effect of self-organisation of nanostructure compositions on intense friction surfaces, effect of self-strengthening, self-lubrication, self-damping of vibrations and noises, which are used for operation at normal and negative temperatures.

9 cl, 13 dwg, 4 tbl

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