JPS61146751A - Manufacture of fe2o3 slider material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the production of slider materials for FDD magnetic heads,
It is about the method.

[Prior art and its problems]

For slider materials for conventional FDD magnetic heads.

TiBaO3# T1Ca0a series slider material is used.

The above slider material has a thermal expansion coefficient and wear resistance of Ferrite)
Although it is close to K, there are still problems in terms of reactivity with glass, especially in terms of bubble generation. Furthermore, if heat treatment is performed in a reducing atmosphere during glass bonding, the problem of discoloration of the slider remains.

[Purpose of the invention]

Therefore, the object of the present invention is to have high wear resistance.

The present invention aims to provide a method for manufacturing a slider material that has a coefficient of thermal expansion close to 7 K, has good reactivity with glass, and does not discolor.

The aim is to produce a slider material that has better wettability than ferrite and produces fewer bubbles, and that does not discolor and has a controlled coefficient of thermal expansion even though it is one component of ferrite.

That is, according to the present invention, there is provided a method for manufacturing a slider material for an FDD magnetic head, the main component being Fe2O3.
40wt% or less of At205r as a subcomponent.
ZrO2 below 40 wt S, ・ below 40 wt S
5nOz, 40wt '16 or less CeO2r
One or more of ZnO of 30 wt S or less and T t O2 of 20 wt% or less with a total of 0.
1 to 40 wt S or less, and wet-mixed in a sol mill.

A binder such as PVA is added to this mixture, granules are made using a spray dryer, etc., and the molded product is molded using a normal molding method such as mold pressing, and the molded product is fired in the air at a temperature of 1000°C or higher. , obtain a sintered body.

〔Example〕

Fe 20s and r At203r Tie2r ZrO
2+5n02s Ce02pZnO was individually weighed in the amounts shown in Tables IA and IB, and mixed 24 hours a day in a steel sol mill. After that, 1 liter of a binder such as PVA was added, and the mixture was dried using a spray dryer or the like. Produce granules.

It was molded into a predetermined shape using a conventional molding method such as mold pressing. This molded body was held in the atmosphere at 110° C. for 3 hours and fired. Conventional Ba is used for sample clothing 2 for thermal expansion coefficient measurement.
A simple characteristic of Ti03r CaTiO3-based slider material is shown.

The following table shows the remaining days I A Table IB - The coefficient of thermal expansion α of Ni-Zn ferrite is usually 70 to 100 (×10-7℃), and the α of MnZn ferrite is usually 90 to 130 (XIO'℃). ,
Cracks in glass, ferrite, ceramic, and sliders are ±
Considering that it occurs significantly at about 5 × 10 °C, the range of α that should be included in the slider material is 70 to 130 (
XIO°C) and a Vickers hardness Hv of at least 550.

Therefore from Table IA and Table IB + Zr015n021
CeO2 is 40 wt% or less* ZnO is 30 wt%
*below.

A T t O2 of 20 wt* or less substantially satisfies the above requirements. It should be noted that even if an even larger amount of sub-components is added, such as 40 or more, the above-mentioned limits of α and Hv are still satisfied.

This is not preferable because the specularity deteriorates. Also, as seen from Table IA and Table IB, when the additive is 00, that is, Fe
20. In the case of chisels, the size of each particle is as much as 10 μm, which weakens the bonding force and reduces reliability, so the preferable lower limit for each attachment is close to 0. ÷1,000 Since it changes depending on the sintering temperature, etc., it cannot be definitively determined. However, if the limit is 0.1% or less, it is difficult to control the amount, so it is actually not preferable to reduce it to 0.1% or less. For reference, the table shown in Table 2
2. According to the characteristics of the conventional slider, the particle size density of the conventional slider is about 5 μm.

Next, examples in which two or three types of subcomponents are added will be described. Table 3 shows the added components and the characteristics of the obtained slider. The data shown in Table 3 shows that even though the types of additives increase, if you look at the total as a unit, the individual items are 40wt and 30wt
wt%, 2Q wt%, 2 total within the range of 4
It turns out that it is sufficient to keep it below 0%. However, the lower limit may be set to 0.1 wt% as mentioned above.

〔Effect of the invention〕

Claims (1)

[Claims] 1. A method for manufacturing a slider material for an FDD magnetic head, in which the main component is Fe_2O_3, and the subcomponents are 40 wt% or less of Al_2O_3, 40 wt% or less of ZrO_2, 40 wt% or less of SnO_2, and 40 wt%.
% or less of CeO_2, 30 wt% or less of ZnO, and 20 wt% or less of TiO_2, one or more of them are added so that the total becomes 0.1 to 40 wt%, and 10
Fe_ characterized by performing firing at a temperature of 00°C or higher
Method for manufacturing 2O_3 series slider material.