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Substrate for magnetic head, magnetic head, and recording medium drive device

A technology for magnetic heads and substrates, applied in the directions of magnetic recording, magnetic recording head, configuration/installation of recording heads, etc., which can solve the problem of low ratio of titanium carbide grains, insufficient prevention of grain threshing, and large chip size, etc. question

Inactive Publication Date: 2010-03-31
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in a magnetic head slider material containing titanium carbide grains and alumina grains, if the number ratio of titanium carbide grains is low, it may be difficult to suppress Ai by TiC grains. 2 o 3 grain growth
Therefore, if abnormal grain growth occurs in the alumina crystal grains during sintering, it is not possible to cut the substrate for a magnetic head into a rectangular shape, or to form a flow path surface by ion milling or reactive ion etching. Prevent degranulation of grains
If abnormal grain growth occurs in alumina crystal grains, there is also a problem that the size of chipping becomes large.

Method used

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  • Substrate for magnetic head, magnetic head, and recording medium drive device
  • Substrate for magnetic head, magnetic head, and recording medium drive device
  • Substrate for magnetic head, magnetic head, and recording medium drive device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] In this example, fourteen types of substrates for magnetic heads (sample Nos. 2 o 3 And the mass ratio of TiC, conductivity, density, number ratio of TiC crystal grains and machinability.

[0090] The substrate for a magnetic head is manufactured by pressure sintering after preparing a predetermined slurry to form a molded body.

[0091] The slurry is passed through the Al 2 o 3 powder, TiC powder, TiO 2 Powder, Yb 2 o 3 The powder, the binder for molding, and the dispersant were put into a glass bead mill in predetermined amounts, and glass beads for pulverization were produced using the average particle diameters shown in Table 1. The average particle diameter of the pulverized particle diameters of the raw materials in the slurry was measured by the light transmission centrifugal sedimentation method specified in JIS Z 8823-2:2004. Table 1 shows the measurement results of the pulverized particle diameters of the raw materials.

[0092] The molded article is f...

Embodiment 2

[0111] In this example, regarding the substrate for a magnetic head, the relationship between the average crystal grain size of TiC crystal grains and machinability was confirmed.

[0112] Basically, a substrate for a magnetic head was produced under the same conditions as in Example 1. However, in this example, five kinds of slurries were produced using the raw material of sample No. 8 (see Table 1) used in Example 1, and as shown in Table 2, the pulverization times of these five kinds of slurries were different. From these slurries, substrates for magnetic heads (No. 15 to 19) were produced.

[0113] The TiC content of the magnetic head substrate was determined by analyzing an image in the range of 5 μm × 8 μm taken with a scanning electron microscope (SEM) at a magnification of 13,000 times with image processing software (Image-Pro Plus, manufactured by Nihon Visual Science Co., Ltd.). The average crystal grain size of the grains. Table 2 shows the measurement results of ...

Embodiment 3

[0119] In this example, the relationship between the flexural strength and the machinability was confirmed for the substrate for a magnetic head.

[0120] Basically, a substrate for a magnetic head was produced under the same conditions as in Example 1. However, in this example, using the raw material of sample No. 8 (see Table 1) used in Example 1, after pressurizing and sintering the molded body, hot isostatic pressing sintering was carried out at the temperature shown in Table 3 ( HIP) for 1 hour to produce magnetic head substrates (No. 20 to 22).

[0121] The flexural strength of the substrate for a magnetic head was measured as a three-point flexural strength in accordance with JIS R 1601-1995. The measurement results of the three-point bending strength are shown in Table 3.

[0122] The machinability of the substrate for a magnetic head was basically evaluated as the maximum value of chips in the same manner as in Example 1. However, a diamond blade having the same sp...

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Abstract

This invention provides a substrate, for a magnetic head, formed of a sinter comprising not less than 60% by mass and not more than 70% by mass of Al2O3 and not less than 30% by mass and not more than40% by mass of TiC, and a magnetic head produced from the substrate for a magnetic head and a recording medium drive device comprising the magnetic head. In the substrate for a magnetic head (7,7'),the proportion of the number of TiC crystal grains present on any straight line of not less than 10 ¢mu!m on a cut surface of the sinter is not less than 55% and not more than 75% based on the total of the number of TiC crystal grains and the number of Al2O3 crystal grains present on the straight line.

Description

technical field [0001] The present invention relates to a recording medium drive device such as a hard disk drive or a magnetic tape drive, a magnetic head used therein, and a substrate for a magnetic head for forming a slider as a base material of the magnetic head. Background technique [0002] In recent years, the increase in the density of magnetic recording to recording media has rapidly progressed. Generally, as a magnetic head for both recording and playback, a magnetic head equipped with an electromagnetic conversion element is used on a slider that floats on a recording medium. [0003] A slider used for such a magnetic head is required to have excellent surface smoothness on a floating surface facing a recording medium or the like and receiving buoyancy by air in addition to excellent machinability and wear resistance. As an example, a magnetic head can be manufactured by the following procedure. [0004] First, in Al 2 o 3 - On a ceramic substrate made of TiC-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/60C04B35/111G11B5/31G11B21/21
CPCG11B5/3106G11B5/40G11B5/102G11B5/6011G11B5/3173Y10T428/1157
Inventor 王雨丛中泽秀司中尾裕也源通拓哉堀内伸起
Owner KYOCERA CORP
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