JPS6033341A - High magnetic permeability alloy excellent in wear resistance property - Google Patents

Abstract

PURPOSE:To enhance the wear resistance property of an alloy without deteriorating the magnetic characteristics thereof, by adding and containing a specific amount of Ru in an Fe-Co-Si soft magnetic material. CONSTITUTION:As a high magnetic permeability alloy for a magnetic head material, 0.05-3.0atom% of Ru is contained in an Fe-Co-Si alloy containing 16.5- 20.0atom% Si and 11.0-16.0atom% Co. By this method, wear resistance property of the Fe-Co-Si soft magnetic alloy is enhanced without deteriorating the magnetic characteristics thereof. In addition, if at least one of metals selected from a group consisting of Ti, V, Nb, Ta, Cr, Mo, W and Cu is added in a sum total of 2.0atom% or less, wear resistance property can be further enhanced without excessively deteriorating magnetic characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high magnetic permeability alloy having excellent wear resistance and soft magnetic properties, particularly to a high magnetic permeability alloy for diagonal use on the side of a magnetic head.

In general, magnetic head materials require the above-mentioned bamboo shoots.

(1> High magnetic permeability.

(2) High saturation magnetic flux density.

(3) 1% degree is high and wear resistance ↑1 is good.

(4) High electrical resistance.

From this point of view, various alloy systems have been studied, and permalloy and sendust have been widely used in practical use. Fe
-Co-3i alloys have already been studied as soft magnetic materials, but they are extremely hard and brittle and cannot be rolled, so they have not been put to practical use.

In recent years, it has become possible to produce platinum ribbons of several tens of micrometers using the molten metal quenching method, which was published in Japanese Unexamined Patent Publication No. 57-7390! As shown in No. i, a Fe-Co-8'-i alloy ribbon is produced. This alloy has a higher magnetic flux density than Sendust and is promising as a magnetic head material for high recording density, but it does not have sufficient wear resistance when used as a magnetic head.

The reason for this is that an oxide film is formed on the contact surface due to the chemically corrosive atmosphere that the magnetic layer of the tape, etc. that comes into contact with the magnetic head often has, or due to carbon dioxide gas, moisture, etc. present in the air. This is because the magnetic powder peels off due to the abrasive action of the magnetic powder as it travels, causing wear on the magnetic head.

An object of the present invention is to improve the above-mentioned drawbacks of the prior art and to provide a high magnetic permeability material that has excellent soft magnetic properties and wear resistance.

ω of CO and 3i has a coercive force of approximately 0 when heat treated.
．． The area was determined to be 10e or less. The results are shown in FIG.

Generally, in order to impart wear resistance to materials, carbon and noble metals are widely added. As a result of extensive research, the present inventors have found that by adding Ru in an amount of 0.05 atomic % or more and less than 3.0 atomic %, the Fe-Co-3i alloy has improved wear resistance without deteriorating its magnetic properties. I discovered scales that gave them gender. This is not observed when adding other elements, such as Or.

In other words, as the amount of Cr added increases, the wear resistance improves, but the magnetic properties deteriorate, making it impossible to obtain a material that can withstand actual use.

On the other hand, when Ru was added, good magnetic properties and wear resistance were observed in the region of 0.05 atomic % to 3.0 atomic % ungrooved. Here, if it is less than 0.05 atomic %, no improvement in wear resistance is observed, and if it is 3.0 atomic % or more, the magnetic properties are adversely affected, so the above range was set.

After further intensive research, Fe COS! -Ti, V, Nb, Ta, Cr, M for Ru alloys.

The sum of elements selected from the group consisting of W and Cu is 260.
It has been found that by adding less than atomic percent, wear resistance can be further improved without significantly deteriorating magnetic properties. Addition of 2.0 atomic % or more has a large adverse effect on magnetic permeability. T; , v, Nb.

The effects of Ta, Cr, Mo, and W are thought to be due to the formation of hard carbides, etc., and the effect of Cu is thought to be due to the corrosion resistance of Cu, but these effects are due to the combined addition with RIJ. appear.

Example 1 Raw materials were mixed to have an atomic ratio of 69% Fe, 13% CO, and 3rig%, and then dissolved in an argon atmosphere and sucked into a transparent quartz tube. This alloy was remelted, and after dissolving the Ru, it was sucked into a transparent quartz tube and used as a master alloy. This master alloy was rapidly cooled from the molten state by a twin roll method to obtain a ribbon. Thin strip [1] is approximately 5-9mm, thickness is 40-70μ
m, the length was several meters.

The obtained thin strip was sandwiched between two alumina plates, 3-,
Heat treatment was performed at 1150° C. for 2 hours under a reduced pressure of 10 TOrr. Table 1 shows the properties of the ribbon after heat treatment.

The magnetic properties of the RU additive material are good, showing superior magnetic properties compared to sendust, and not so inferior to the non-additive material. The heat-treated thin strips were photoetched and laminated to form a head shape, and then subjected to tape sliding test 1 for 100 hours. The results are shown in Table 2.

It can be seen that as the amount of Ru added increases, the amount of head wear decreases.

Example 2 (Feo, bq COo, ts S 'o, 1g) Tough, 7-y Ruo, 3 fvlj, (fvl is T
i, V, Nb, Ta, Cr', Mo
, W, and Cu) was subjected to a tape sliding test in the same manner as in Example 1. The results are shown in Table 3.

Table 3 The present invention is as described above and is suitable as a material for magnetic heads and contributes to the progress of industry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the coercive force after heat treatment when lat% of Ru is included.

Claims (1)

[Claims] 1.3i1G, 5-20.0 at%, Co, 11.0
A high magnetic permeability alloy with excellent wear resistance characterized by containing ~16.0 at% of RuO, 05~3.0 at% of RuO, and the remainder consisting of Fe and unavoidable impurities.2.'r , l , V, Nb, Ta, Cr, Mo, W, C
Claim 1 in which at least one element selected from the group consisting of u is added in a sum of less than 2.01 Kyoko%.
G-permeability alloy with excellent wear resistance as described in section.