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Sintered Fe-Pt-based magnetic material

A technology of magnetic materials and non-magnetic materials, applied in the direction of magnetic objects, magnetic thin films, coated with magnetic layers, etc., can solve the problems of fragmentation yield, difficulty in manufacturing high-density sintered bodies, low density, etc., to reduce powder particles volume effect

Active Publication Date: 2015-05-27
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Hexagonal BN (a compound of boron and nitrogen), which is the above-mentioned non-magnetic material, exhibits excellent performance as a lubricant, but when used as a raw material for powder metallurgy, it is difficult to produce a high-density sintered body due to its poor sinterability
In addition, when the density of the sintered body is low, when the sintered body is processed into a target, there is a problem that defects such as cracks and chipping occur and the yield decreases.
In addition, when the density is low, there is a problem that a large number of voids are generated in the target, and the voids become a cause of abnormal discharge, and particles (dust attached to the substrate) are generated during sputtering, resulting in a decrease in product yield

Method used

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  • Sintered Fe-Pt-based magnetic material
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  • Sintered Fe-Pt-based magnetic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Prepare Fe powder, Pt powder, Ag powder, SiO 2 powder, BN powder as raw material powder. These powders were weighed to obtain 65(50Fe-45Pt-5Ag)-5SiO 2 -30BN (mol%).

[0060] Next, the weighed powder was put into a media agitation mill with a capacity of 5 L together with zirconia balls as a grinding medium, and rotated for 2 hours (300 rpm) for mixing and grinding. Then, the mixed powder taken out from the media agitated mill was filled into a carbon mold and hot-pressed.

[0061] The hot pressing conditions were a vacuum atmosphere, a heating rate of 300° C. / hour, a holding temperature of 950° C., a holding time of 2 hours, and pressurization at 30 MPa from the start of heating to the end of holding. Cool naturally in the cavity directly after holding.

[0062] Next, hot isostatic pressing is performed on the sintered body taken out from the mold of the hot press. The conditions of the hot isostatic pressing process were a heating rate of 300°C / hour, a holding tem...

Embodiment 2

[0075]Prepare Fe powder, Pt powder, SiO 2 powder, BN powder as raw material powder. Weigh these powders to get 70(50Fe-50Pt)-5SiO 2 -25BN (mol%).

[0076] Next, the weighed powder was put into a media agitation mill with a capacity of 5 L together with zirconia balls as a grinding medium, and rotated for 2 hours (300 rpm) for mixing and grinding. Then, the mixed powder taken out from the media agitated mill was filled into a carbon mold and hot-pressed.

[0077] The hot-pressing conditions were the same as in Example 1, a vacuum atmosphere, a heating rate of 300° C. / hour, a holding temperature of 950° C., a holding time of 2 hours, and pressurization at 30 MPa from the start of heating to the end of holding. Cool naturally in the cavity directly after holding.

[0078] Next, hot isostatic pressing is performed on the sintered body taken out from the mold of the hot press. The conditions of the hot isostatic pressing process are the same as in Example 1. The heating rate i...

Embodiment 3

[0090] Prepare Fe powder, Pt powder, Cu powder, SiO 2 powder, BN powder, TiO 2 Powder and MgO powder are used as raw material powder. These powders were weighed to obtain 73(30Fe-60Pt-10Cu)-5SiO 2 -20BN-1TiO 2 -1 MgO (mol %).

[0091] Next, the weighed powder was put into a media agitation mill with a capacity of 5 L together with zirconia balls as a grinding medium, and rotated for 2 hours (300 rpm) for mixing and grinding. Then, the mixed powder taken out from the media agitated mill was filled into a carbon mold and hot-pressed.

[0092] The conditions of the hot pressing were the same as in Example 1, a vacuum atmosphere, a heating rate of 300° C. / hour, a holding temperature of 1060° C., a holding time of 2 hours, and pressurization at 30 MPa from the start of heating to the end of holding. Cool naturally in the cavity directly after holding.

[0093] Next, hot isostatic pressing is performed on the sintered body taken out from the mold of the hot press. The conditi...

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Abstract

A sintered Fe-Pt-based magnetic material which contains BN and SiO2 as non-magnetic materials, said sintered Fe-Pt-based magnetic material being characterized in that Si and O exist in a B- or N-existing region on a cross section of the sintered material. The present invention addresses the problem of making it possible to produce a magnetic thin film in a thermally-assisted magnetic recording medium and the problem of providing a high-density sputtering target in which the amount of particles formed upon sputtering is reduced.

Description

technical field [0001] The present invention relates to a sintered body for manufacturing a magnetic thin film in a heat-assisted magnetic recording medium and a method for manufacturing the same. Background technique [0002] In the field of magnetic recording represented by hard disk drives, materials based on Co, Fe, or Ni, which are ferromagnetic metals, are used as materials for magnetic thin films in magnetic recording media. For example, a Co-Cr-based or Co-Cr-Pt-based ferromagnetic alloy containing Co as a main component has been used as a magnetic thin film of a hard disk employing an in-plane magnetic recording method. In addition, the magnetic thin film of the hard disk adopting the perpendicular magnetic recording method that has been put into practical use in recent years often uses a composite material containing a Co—Cr—Pt-based ferromagnetic alloy mainly composed of Co and nonmagnetic inorganic particles. Furthermore, from the viewpoint of high productivity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/65C23C14/34G11B5/851
CPCG11B5/851C23C14/3414C22C32/0005C22C33/0278H01F10/123H01F41/183C22C33/0292B22F2998/10B22F2999/00C22C1/0466C22C1/051C22C5/04C22C38/002C22C38/16G11B5/658C22C1/1084B22F3/14B22F3/15B22F2201/11C22C33/02C30B29/16C30B29/38H01F1/33
Inventor 荻野真一
Owner JX NIPPON MINING & METALS CORP
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