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Fe-based magnetic material sintered body

A technology of magnetic material and sintered body, applied in the direction of coating magnetic layer, coating carrier support, metal material coating process, etc., can solve the problems of poor machinability, lower yield, and high ionization tendency, and achieve crack suppression. , The effect of producing less powder

Active Publication Date: 2014-12-24
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, Fe, a magnetic material, has a high tendency to ionize, so it easily reacts with oxygen to form iron oxide in the air or in an atmosphere where oxygen exists.
However, this iron oxide is very brittle, so when it exists in a sintered body, when the sintered body is processed into a sputtering target or the like, cracks, chipping, etc. may occur, which significantly deteriorates the machinability of the sintered body and reduces the yield. The problem
In particular, when the sintered body contains difficult-to-sinter materials such as C and BN, there is a problem that the machinability is further deteriorated compared with sintered bodies based on other components.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] As raw material powders, Fe—Pt alloy powder, Ag powder, and BN powder were prepared. These powders were weighed to achieve 60(45Fe-45Pt-10Ag)-40BN (mol%).

[0048] Next, the weighed powder was put into a mortar and mixed uniformly. Then, the mixed powder taken out from the mortar was filled into a carbon mold and hot-pressed.

[0049] The hot pressing conditions were set to a vacuum atmosphere, a heating rate of 300° C. / hour, a holding temperature of 950° C., and a holding time of 2 hours, and pressurized at 30 MPa from the start of heating to the end of holding. Cool naturally in the chamber directly after holding.

[0050] Next, hot isostatic pressing is performed on the sintered body taken out from the hot press mold. The conditions of the hot isostatic pressing process were set at a heating rate of 300°C / hour, a holding temperature of 950°C, and a holding time of 2 hours. The pressure of Ar gas was gradually increased from the beginning of the heating, and the te...

Embodiment 2

[0064] As raw material powders, Fe—Pt alloy powder and BN powder were prepared. These powders were weighed to achieve 70(50Fe-50Pt)-30BN (mol%).

[0065] Next, the weighed powder was put into a mortar and mixed uniformly. Then, the mixed powder taken out from the mortar was filled into a carbon mold and hot-pressed.

[0066] The hot pressing conditions were set to a vacuum atmosphere, a heating rate of 300° C. / hour, a holding temperature of 1400° C., and a holding time of 2 hours, and pressurized at 30 MPa from the start of heating to the end of holding. Cool naturally in the chamber directly after holding.

[0067] Next, hot isostatic pressing is performed on the sintered body taken out from the hot press mold. The conditions of the hot isostatic pressing process were set at a heating rate of 300°C / hour, a holding temperature of 1100°C, and a holding time of 2 hours. The pressure of the Ar gas was gradually increased from the beginning of the heating, and the temperature w...

Embodiment 3

[0072] As raw material powders, Fe—Pt alloy powder, Ag powder, BN powder, and C powder were prepared. These powders were weighed to achieve 65(45Fe-45Pt-10Ag)-5BN-30C (mol%).

[0073] Next, the weighed powder was put into a mortar and mixed uniformly. Then, the mixed powder taken out from the mortar was filled into a carbon mold and hot-pressed.

[0074] The hot pressing conditions were set to a vacuum atmosphere, a heating rate of 300° C. / hour, a holding temperature of 950° C., and a holding time of 2 hours, and pressurized at 30 MPa from the start of heating to the end of holding. Cool naturally in the chamber directly after holding.

[0075] Next, hot isostatic pressing is performed on the sintered body taken out from the hot press mold. The conditions of the hot isostatic pressing process were set at a heating rate of 300°C / hour, a holding temperature of 950°C, and a holding time of 2 hours. The pressure of Ar gas was gradually increased from the beginning of the heatin...

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Abstract

An Fe-based magnetic material sintered body containing BN, which is characterized by having an oxygen content of 4,000 wt ppm or less. The present invention addresses the problem of providing a sintered body which enables the formation of a magnetic thin film in thermally assisted magnetic recording media, and which is suppressed in the occurrence of cracks or chipping when processed into a sputtering target and the like.

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): G11B5/64C23C14/34G11B5/851
CPCG11B5/851C23C14/3414G11B5/658
Inventor 荻野真一
Owner JX NIPPON MINING & METALS CORP