JPS62202350A - Sliding contact member for magnetic tape - Google Patents

Abstract

PURPOSE:To obtain a sliding contact member for a magnetic tape which is free from the deterioration in material quality and deformation, has excellent wear resistance and adhesiveness to a substrate and has a small coefft. of friction by implanting the ions of nitrogen or oxygen to the surface of the sliding contact member. CONSTITUTION:The member which makes sliding contact with the magnetic surface of the magnetic tape is constituted of one kind selected from a group consisting of Al, Al alloy, Ti and Ti alloy and the ions of the ionized nitrogen or oxygen are implanted at >=1X10<17> pieces ions/cm<2> are implanted onto the surface of the sliding contact member to form the nitride layer or oxide layer with the sliding contact member on at least the surface to make sliding contact with the magnetic tape. Since the accelerated ions are implanted, the nitride or oxide decreases the concn. from the surface to the inside of the sliding contact member and has no distinct boundary with the substrate. The good sliding contact member for the magnetic tape which has the good adhesiveness and decreases the deterioration in the material quality and the deformation to an extremely low level as the substrate is not heated is thus obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording and reproducing device that uses magnetic tape as a recording medium, and relates to a magnetic tape suitable for use as a member that comes into contact with and slides on the magnetic surface of the magnetic tape. It relates to a sliding contact member.

[Conventional technology]

Conventionally, materials such as A/type alloys and stainless steel have been used for members that come into sliding contact with the magnetic surface of magnetic tape, such as the magnetic tape guide drum of EVA video tape recorders, guide bins, and magnetic tape guide pins of computers. Ta. These materials were used with machined finishes, resulting in short lifespans. In order to eliminate these drawbacks, it has been proposed to perform surface treatments such as ceramic coating or various platings on the surface. for example,
JP-A-57-122449 proposes a structure in which a nitride or carbide layer of Ti, Sl, and Ta is formed on the surface by an ion blasting method or a reactive sputtering method.

In these methods, the metal to be deposited is adsorbed onto the surface of the substrate while being evaporated in a reactive gas to form a coating layer. Therefore, since the adhesion strength of the coating layer depends on the heating temperature of the base material, it is necessary to heat the base material in order to obtain a certain degree of adhesion strength. Although a hard layer of Ta nitride or carbide can be obtained using these methods, a member for sliding contact with a magnetic tape cannot be called a good sliding contact member simply by hardening the surface; However, various issues remain.

[Problem that the invention seeks to solve]

Although the above-mentioned conventional technology can improve the wear resistance or friction coefficient with the magnetic tape to some extent, it does not take into account coating on materials that have undergone modification treatment, such as mul-based alloys, and does not work well with the base material. There are problems with adhesion, deformation, etc. If the adhesion to the base material is poor, there is a risk that it will peel off due to the cold-heat cycle of frictional heat generated by friction with the tape. In addition, since the above technique laminates the evaporated metal onto the base material, the boundary with the base material is mechanically bonded, and the boundary becomes an obstacle when heat escapes to the base material side. That is, since heat conduction is achieved by the movement of electrons, if there is a boundary between mechanically bonded states, the movement of electrons cannot be carried out smoothly and heat conduction becomes slow. On the other hand, as described above, the adhesion with the base material is influenced by the temperature of the base material, and increasing the heating temperature improves the adhesion, but causes a change in the mechanical properties or deformation of the base material. Therefore, it is desirable that the substrate be treated without heating and that has excellent adhesion.

An object of the present invention is to provide a magnetic tape sliding contact member having a surface layer with extremely little change or deformation of the base material due to the formation of the surface layer, excellent wear resistance, low coefficient of friction, and excellent adhesion. It is in.

[Means for solving problems]

The present invention solves the above-mentioned problems, and to summarize the present invention, the present invention relates to a magnetic tape sliding contact member, and is a magnetic recording/reproducing device using a magnetic tape as a recording medium. The member that comes into sliding contact with the magnetic surface is made of Ifi selected from the group consisting of mulch, mulch alloy, Ti, and T alloy, and the surface of the sliding member is injected with I x 10Sγ ions of nitrogen or oxygen. /By ion implantation, a nitride layer or oxide layer with the sliding contact member is formed at least on the surface of the portion that comes into sliding contact with the magnetic tape, and the nitride or oxide layer is in contact with the sliding contact member. The cotton concentration decreases from the surface of the part to the inside,
It is characterized by not having a clear boundary with the base material.

The magnetic tape sliding contact member applies r-iF@ to Or coated or vapor-deposited on the magnetic surface of the magnetic tape, and Qo-y-
Contact with hard oxides such as FelOl and Or-7-IFe103.

Therefore, it is desirable that the surface has good wear resistance.

Yes. In addition, it is desirable that the magnetic tape sliding contact member has a small coefficient of friction, no electrostatic charge, and good thermal conductivity.

In order to solve the conventional problems, the present inventors have developed a method that differs from the method of coating a base material with a different material, by ionizing a gas to be reacted with the base material and injecting it into the base material. was reacted with the base material, AIA/%τ1 alloy, to form a nitride or oxide layer on the surface. In other words, nitrogen or oxygen was ionized, accelerated, and injected into the base material. React with the base material to form a nitride or oxide layer with the base material.In order to implant ionized nitrogen or accelerated ions of oxygen, there is a clear boundary between the base material and the nitride or oxide layer. Instead, the atomic bond state is 4, the adhesion is good, and the base material is not heated, so a good magnetic tape sliding contact member with very little material change or deformation can be obtained, and the conventional problems can be solved. .

The present invention will be explained in more detail below.

The magnetic tape sliding contact member of the present invention has hard heN on the outermost surface,
hl, Os, TIN, Tiot, etc. are formed, and the concentration of these nitride layers or oxide layers decreases near the base material to become a mixture layer with the base material, and the inside becomes the base material. That is, accelerated nitrogen ions or oxygen ions are implanted into the base material, the implanted ions generate heat, and react with base material components to form nitrides or oxides. The heat generated is only near the surface where the ions are implanted, and the near surface becomes a pseudo-high temperature and reacts with the base material, such as Al or Ti.
, form TiN, and for oxygen ions A/, Os, '
I'101 etc. are formed. The heat generated during ion implantation is only near the surface, and the material of the base material does not change or deform.

Usually, the formation temperature of Mu/N or TiN is 800~1
000°C, but in the case of ion implantation, only the surface becomes high temperature, and the temperature of the base material does not rise.

However, depending on the ion implantation conditions, heat may accumulate and the base material may be heated, so it is desirable to cool the base material. A nitride or oxide layer with excellent adhesion can be formed even when the base material is cooled. Therefore, since the base material is not heated, there is no material change or deformation of the base material, and there is no dimensional change, so a nitride layer or oxide layer can be formed after processing into a predetermined shape and size.

The nitride layer or oxide layer of the present invention is not a base material because accelerated nitrogen or oxygen ions are injected into the base material and form a compound with the base material where the ions stop. Becomes an atomically bonded state. In addition, the depth of ion implantation is not constant, and the boundary with the base material is not clear.

Therefore, the adhesion between the nitride layer or oxide layer and the base material is extremely good, and because they are atomically bonded, static electricity can be prevented, and frictional heat from the tape is quickly transferred to the base material. can. In addition, the surface has a hard AIM, ),
It has a low coefficient of friction such as 1.0g, Tie, Tilt, etc., and has a layer with excellent wear resistance, which satisfies the requirements for a magnetic tape sliding contact member. That is,
The hard oxide on the magnetic surface of the magnetic tape comes into sliding contact with the hard layer, resulting in friction between hard materials, so the coefficient of friction is small.
Abrasion resistance becomes good. In order to form these nitride or oxide layers, it is necessary to implant nitrogen or oxygen ions at a rate of 15 (10' ions/Fu2 or more).

If the number of ions is less than 1X 10'', the surface cannot be formed into a nitride or oxide layer, and a large amount of the base material components remains, resulting in poor wear resistance.
cm” or more is better.

As described above, the magnetic tape sliding contact member of the present invention has abrasion resistance, a small coefficient of friction, high adhesion, antistatic properties, and high thermal conductivity, all of which are required of a magnetic tape sliding contact member.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.
The invention is not limited to these examples.

Example 1 50. as a base material. X50. X2- mul type alloy plate (22
18) and the Ti plate were attached to a water-cooled plate in a vacuum container, and after evacuating the inside of the container to 10 Torr, nitrogen ions and oxygen ions were injected onto the surface of the substrate using a packet type ion source. The implantation conditions are acceleration voltage: 20 kV, current: α1 μm, implantation amount: 5×10”1 ion/an”
It is.

These were processed into Auger electron spectroscopy analysis samples and bending test pieces. Auger electron spectroscopy was performed by digging down from the surface to the Hess locusts on the substrate side.

In addition, the bending test was performed using a bending test jig (tip R5).
An 80° bending test was conducted. As a comparison material, A/alloy (2218) was coated with α3μ grooves by heating the base material to 200° C. and brating TiN into ions.

Figure 1 shows the results of observing the surface structure using a scanning electron microscope (hereinafter abbreviated as 8FIM) after performing a 180° bending test on a mulch plate made of the invention material with nitrogen ions implanted. This is a BEM photo.

Figure 2 shows T made by ion blating, which is a comparative material.
EI of the surface of iN coating material after 180° bending test
This is an 8XM photograph showing the results of EM observation.

As is clear from FIG. 1, the material of the present invention has cracks on the surface, but no peeling of the surface layer. In contrast, when looking at the comparative material in FIG. 2, it can be seen that the surface layer (TiN coating layer) has peeled off. As is clear from these figures, it can be seen that the material of the present invention has extremely good adhesion. Note that similar results were obtained for the case where oxygen ions were implanted into the Mul plate and the case where nitrogen ions and oxygen ions were implanted into the Ti plate.

Figure 3 shows the results of Auger electron spectroscopy of the inventive material and the comparative material in terms of sputtering time (minutes, horizontal axis) and peak intensity ratio (
This is a graph showing the relationship between work and work (vertical axis). As is clear from Figure 3, IN was formed on the surface of the material of the present invention, and the concentration of nitride decreased from the surface to the base material, and the concentration of A/, which is the base material, increased. There are parts. That is, there is a mixed layer of the base material and nitride, and the boundary between the nitride layer and the base material is not clear. In contrast, the 71M coating material made of ion grating, which is a comparative material, has a clear boundary between the base material and the coating layer. Therefore, it can be seen that the nitride layer of the present invention material is not mechanically bonded to the base material and has good adhesion.

It should be noted that similar results were obtained with the case where oxygen ions were implanted into he and the case where nitrogen ions and oxygen ions were implanted into Ti.

Example 2 The base material was a M1 alloy cylinder (AJF-11131 alloy) of φ60-×φ5 A-X 50 m and a φ5. X50.
Nitrogen ions and oxygen ions were implanted under the conditions of Example 1 using Mul material (2014) and Ti material. Outer diameter φ60-
The outer diameter of each sample was precisely measured before treatment, and the samples were used as dimensional change measurement samples and hardness measurement samples after treatment. φ5
Item (3) was used as a sample for friction coefficient measurement.

Table 1 shows the results of measuring changes in the outer diameter before and after ion implantation. The comparative material has a base material of A/gold alloy A/-11El
The TIN coating material was obtained by ion blating in which the substrate was heated to 250° C. in i), and the thickness of the coating layer was 15 μm. Note that the dimensional change is the maximum value determined by roundness measurement.

As is clear from Table 1, the material of the present invention exhibits extremely little dimensional change before and after treatment.

Therefore, it can be seen that it can be processed after being processed into a predetermined shape and size, and no post-processing is required.

Table 2 shows the hardness measurement results of the base material before and after the ion implantation treatment. These samples were all subjected to solution treatment at 500° C. for 1 hour and aging treatment at 170° C. for 8 hours before treatment.

As is clear from Table 2, the hardness of the material of the present invention hardly changes before and after treatment, but the hardness of the comparative material decreases after treatment. Therefore, it can be seen that the temperature of the base material of the present invention material increased below the aging treatment temperature, and there was no change in the material quality of the base material.

FIG. 4 is a schematic diagram showing a friction coefficient measuring device, in which reference numeral 30 represents a sample, 51 represents a magnetic tape, 52 represents a load, and 53 represents a spring gauge.

A magnetic tape (0r (31 tape)) 51 for a video tape recorder is set on a load 52 and a spring gauge 3'5. At this time, the angle θ of the magnetic tape is 90°.

The magnetic tape 514) is pulled by the magnetic tape 514 and the spring gauge 55, and a magnetic tape 514 is pulled by the spring gauge 55 to obtain the magnetic tape 514 and the magnetic tape 514. However, the load in this case is within the range of 10 to 100 gf. Based on the test results conducted using such equipment and conditions, the overall friction coefficient μ can be calculated using the following formula.

A. - Crow・eμ° - Figure 5 shows the measurement results obtained using the above formula. In other words, Figure 5 shows the test results in terms of load (kg, horizontal axis) and friction coefficient (
It is a graph shown in relation to μ (vertical axis). In Fig. 5, curve A is nitrogen ion in Mul, curve B is nitrogen ion in Mul, Vc oxygen ion is in Mul, curve C is nitrogen ion in Ti, and the curve is 'r1.
These are the friction coefficients of the materials into which oxygen ions have been implanted, and all values are LL28 or less.

Normally, recording under normal operation of the video tape recorder,
It is said that the load applied to the tape during playback is 30 to 50 gf. Therefore, within this range, the material of the present invention has a small coefficient of friction of CL22 to 0.24,
Suitable as a magnetic tape sliding contact member. Curve E is a machined finished At-based alloy casting material (AC-5m).
Curve F shows TIN coating by ion blating, and all of these have a higher friction coefficient than the material of the present invention. It is said that the lower the sliding friction coefficient of the magnetic tape sliding member, the better; if it is large, the magnetic tape may stick, causing flickering on the screen. Therefore, it can be seen that the material of the present invention is excellent as a sliding contact member for a magnetic tag.

Example 5 Nitrogen ions were injected into the magnetic tape guide drum of a video tape recorder manufactured by A/Alloy Alloy Co., Ltd. (2024) under the same conditions as in Example 1, and an 800-hour continuous wear test was conducted. The magnetic tape used was 1-IPelOs tape. In addition, Aj-based alloy casting material (AO-8B
) and sputtering TiN
The coating material has a film thickness of 1lL and 5μ.

The amount of wear was determined by measuring the sliding contact area and the non-sliding contact area using a surface roughness meter.

Table 5 shows the results of wear tests with magnetic tape.

As shown in Table 5 and Table 3, the material of the present invention had an extremely small amount of wear of about 105μ, indicating that it has excellent wear resistance. In contrast, books with IN formed by sputtering have greater wear than the material of the present invention. Furthermore, the machined version of AO-8B suffers from extremely high wear. therefore,
It can be seen that the material of the present invention is excellent as a magnetic tape sliding contact member.

Although some specific examples have been described above, the invention is not limited to those described in the embodiments, and can also be applied to guide bins of video tape recorders, computers, etc., for example.

〔Effect of the invention〕

As detailed above, the magnetic tape sliding contact member of the present invention has
It has excellent characteristics not found in conventional materials, such as no material change or deformation, excellent wear resistance, excellent adhesion to the base material, and a low coefficient of friction to be used as a sliding contact member for magnetic tape. .

[Brief explanation of drawings]

Figure 1 is a scanning electron microscope photograph showing the structure of the sample surface after the 1800 bending test was performed on an example of the invention material, and Figure 2 is a photograph of a comparative material similar to Figure 1 after the same test. A photograph showing the surface structure, Fig. 3 is a graph showing the Auger electron spectroscopy results of the inventive material and comparative material, Fig. 4 is a schematic diagram of the measuring device for the subbetical friction coefficient, and Fig. 5 is the subbetical coefficient of friction. It is a graph showing test results. 50: sample, 51: magnetic tape, 52: load, 55 spring gauge

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device that uses magnetic tape as a recording medium, a member that comes into sliding contact with the magnetic surface of the magnetic tape is A.
1 x 10^1^7 ions/cm^2 or more of nitrogen or oxygen on the surface of the sliding contact member. As a result of the injection, a nitride layer or oxide layer is formed on at least the surface of the sliding contact member, and the nitride or oxide extends from the surface of the sliding contact member to the inside. A magnetic tape sliding contact member characterized by having a reduced density and not having a clear boundary with a base material. 2. The magnetic tape sliding contact member according to claim 1, wherein the member slidingly contacting the magnetic tape has a nitride layer or an oxide layer formed thereon after being finished into a predetermined shape.