JPS60223026A - Magnetic disk - Google Patents

Abstract

PURPOSE:To improve the adhesion of a solid lubricating agent having a small coefft. of friction by using the solid lubricating agent which makes the covalent bond with H of a residual -OH group of silanol and has a -CF group and a silane coupling agent having a -CF group for macromolecular bonding. CONSTITUTION:Silanol (Si(OH)4) is coated on the magnetic layer 3 formed on the substrate 1 having a hard layer 2 and is then calcined at about 200 deg.C to form a protective layer 4 consisting of silicon oxide (SiO2). The silane coupling agent (for example, C8F17C2H4Si(OCH3)3) which makes the covalent bond with H of the residual -OH group of the silanol and has the -CF group is then coated thereon. The coating is then calcined at about 200 deg.C to form an auxiliary lubricating agent layer 6. The solid lubricating agent 7 having the -CF group for macromolecular bonding with the -CF group of the layer 6 is coated thereon. The exfoliation of the agent 7 by contact with a head is thus obviated and the attraction of the head to a disk is obviated in the case of using the disk by a contact start-stop system.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a method of manufacturing a magnetic disk (hereinafter referred to as a disk) used in a fixed magnetic disk storage device (hereinafter referred to as a disk device) K.

<Conventional example> Required. K improves recording density by precisely finishing the ridges and surface roughness on the disk surface, making the magnetic layer thinner, and reducing the gap between the magnetic and do (hereinafter referred to as do) to improve resolution. need to be raised.

FIG. 1 shows the structure of a conventional disk. In Figure 1, 1 is a substrate made of aluminum material, with an average surface roughness of approximately 0.0051Jm% and a maximum protrusion of 0.
．． It is finished to about 0.02sJm. To 2Fi, do(
This is a hard layer provided to provide strength against contact with the metal (not shown), and is formed by electroless plating with N1-P of approximately 3011111. Reference numeral 5 denotes a magnetic layer provided on the hard layer 2, which is formed of N1-Co-P by electroless plating to a thickness of about 0.08 μm. 4 is a protective layer for protecting the magnetic layer 3. This protective layer 4-silanol (51(
on)) and heat it at about 200 u for about 24 hours (if you apply heat above 2 oO ℃, the hard layer 4 will become magnetized).
, 0.02 I'm in thickness.

In this heating at 200° C., the silanol is not completely converted into silicon oxide, and a portion remains as 10H groups. 5
is a polar group (-Cool) that has an affinity with the -OH group.
) added liquid lubricant (for example, DuPont Kr
ytox 157M) and is applied to a thickness of about 0.02 mm.

The disk manufactured by the above method has a higher magnetic property than the conventional manufacturing method (in which alumina powder and magnetic material are mixed with a polymeric binder and coated on the surface of an aluminum substrate to a thickness of about 1 μm). Since the layer is thin (approximately 1110 mm), resolution is good, and the surface finish is in good condition, allowing the head to be brought closer to the disk surface, allowing high-density recording.

However, if you contact the head and start strike,
When using the disk drive method, the surface of the disk is precisely machined, so if the disk drive stops, the head may stick to the disk surface, causing cracks, cracks, or cracks when starting up. In order to prevent this, conventionally, a liquid lubricant 5 coated with a solid lubricant with a small coefficient of friction (for example, Vydax AR manufactured by DuPont) has been used. It has a disadvantage that it has weak adhesion to surfaces and can easily peel off when it comes into contact with surfaces.

<Object of the invention> The present invention has been made in view of the drawbacks of the above-mentioned prior art.
The object of the present invention is to provide a disk with improved adhesion of solid lubricant.

<Configuration of the Invention> The configuration of the present invention to achieve this object is to covalently bond silanol (sl(OH)4)H onto a magnetic layer formed on a substrate in a magnetic disk used in a magnetic disk storage device. After applying a silane coupling agent having a -CF group, a lubricant auxiliary layer is formed by baking at about 200°C, and a polymer bond with a Ponggi-CB group is formed on the lubricant auxiliary layer. The structure is such that a solid lubricant with a 10F fund is applied to the lubricant.

<Example> An example of the present invention will be described based on the drawings. Note that the same elements as those in the prior art are given the same reference numerals, and redundant explanations will be omitted.

FIG. 2 shows an embodiment of the present invention, in which a hard layer 2,
A magnetic r@5 and a protective layer 4 are formed. In the present invention, 10H remaining in the silane layer 4 is deposited on the protective layer 4.
The group is brought into close contact with the OCH3 groups of the lubricant auxiliary layer 6 by using covalent bonds, and then heated at about 200°C for about 30 minutes to bake, and this lubricant is bonded to the -CF group of the lubricant auxiliary layer 6. Solid lubricant 7 10F & is polymer-bonded.

FIG. 3 is a conceptual diagram showing the bonding of molecules of the protective layer 4, the lubricant auxiliary layer 6, and the solid lubricant 5 on the magnetic layer 3. Third
In the figure, 10H remained in the protective layer 4 without being converted into SiO.
The base is the silane force of the lubricant auxiliary layer 6, the bring u*cns
On the other hand, the 10F group of the silane coupling agent forms a polymeric bond with the 10F group of the solid lubricant, resulting in strong adhesion.

In the above embodiment, an aluminum material was used as the substrate, but the substrate is not limited to aluminum, but may be any non-magnetic material that is easy to process.

<Effects of the Invention> As specifically explained above in conjunction with the examples, according to the present invention, a solid lubricant with a small coefficient of friction is bonded to the disk with a polymer to improve adhesion, so contact When using the start-stop method, the head will not stick to the disk.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a configuration diagram of a disk showing a conventional example, FIGS. 2 and 3 show an embodiment of the present invention, FIG. The figure is a conceptual diagram showing the bonding of molecules. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Hard layer, 3... Magnetic layer, 4...
...Protective layer, 6...Lubricant auxiliary layer, 7...Solid lubricant. Figure 1

Claims (1)

[Claims] In magnetic dice used in magnetic disk storage devices, 1 silanol (5 silanol) is placed on the magnetic layer formed on the substrate.
After applying 11fi LIeN/,Fj/#'X'[i(OH)) at about 200°C, a protective layer of silicon teoxide is formed, and the residual -〇■ group H of the silanol is removed. After coating a silane coupling agent that is covalently bonded and has a -CF group, it is baked at about 200°C to form a lubricant auxiliary layer, and a precursor -CF group and a polymer are formed on this lubricant auxiliary layer. A magnetic disk characterized in that it is coated with a solid lubricant having a 10F group for bonding.