JPS5939762A - Ceramic for magnetic head lock - 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 Field of the Invention The present invention relates to a porcelain device for a magnetic head stopper that supports a magnetic head that performs recording and reproduction using a magnetic material.

Conventional structure and its problems Traditionally, magnetic head stops that support magnetic heads that read information from or record information on magnetic materials have been made of porcelain such as alumina, forsterite, and stearite. . However, since these porcelains have the same composition, their thermal expansion coefficients hardly change. Therefore, when using it in combination with a ferrite element or a glass material, it is very difficult to select one because the coefficients of thermal expansion of these elements are different. During reproduction, the magnetic head stop also comes into contact with the magnetic tape at the same time. However, since the magnetic head and the magnetic head stopper generally have different abrasion characteristics, a gap is created between the ferrite and the magnetic tape, which adversely affects the magnetization of the magnetic tape.

Furthermore, if the porcelain of the magnetic head stopper has a bore having a diameter of 60 pm or more, it may damage the magnetic tape surface.

In order to solve these problems, we need to use a head that can freely change its coefficient of thermal expansion depending on the purpose, has strong thermal shock resistance, high mechanical strength and Vickers hardness, and has abrasion resistance comparable to that of a magnetic head. Furthermore, it is necessary to develop a porcelain for a magnetic head stopper with a smaller bore. In particular, the hot press method and HIP (Hotl5ostatic Pressin)
g) Porcelain for fasteners such as magnetic heads for electronic computers and video tape recorders using polycrystalline ferrite produced by the method and single crystal ferrite produced by the straddling single crystal method has excellent mechanical strength, thermal spalling, Good hardness, ceramic pore distribution, etc., and a thermal expansion coefficient of +80
Porcelain in the range of ~+96X10'-'°cl is highly desired.

Currently, as a document regarding porcelain for magnetic head fasteners that solves some of these drawbacks, there is
Publication No. 42606, Special Publication No. 51-42606, Special Publication No. 52-
There is a publication No. 29766.

However, since the bore distribution described in these documents has not been improved, there are many bores with bore diameters of 60 μm or more, which damage the surface of the magnetic material on which recording and reproduction are performed. Furthermore, when the atmosphere in the furnace changes from an oxidizing atmosphere to a neutral or reducing atmosphere when firing the porcelain for the magnetic head stopper, Ti0z is reduced and color unevenness occurs inside the porcelain. Although other documents have solved these drawbacks, they also have the disadvantage that chipping is likely to occur during machining and precision machining is difficult.

Purpose of the Invention The present invention eliminates the conventional drawbacks, is extremely stable in the firing atmosphere, has very few chippings during precision machining, and has strong resistance to thermal shock during rapid heating and cooling. The present invention provides a method for manufacturing a magnetic head stopper made of porcelain with a reduced bore.

Structure of the Invention In order to achieve the above object, the present invention has the following objectives: Mg (i) M
36-60% by weight in terms of gO, Ti as TiO2
A magnetic head stopper containing 36-60% by weight in terms of ZrO2iC, 0.2-6.0% by weight in terms of ZrO2iC, and 0.02-6.00% by weight of at least one rare earth element oxide. Composed of porcelain for utensils.

By changing the component ratio within the above range.

Depending on the purpose, the thermal expansion coefficient value is +80 to +95 Xl 0
It can be freely selected within the range of '°cl.1 There is very little chipping during machining, there is no color unevenness due to changes in the firing atmosphere, the bore distribution is good, and the wear is comparable to that of ferrite in magnetic heads. have sex.

Furthermore, it has good thermal shock properties, and even when the ferrite element and the porcelain for the magnetic head stopper are combined through glass, a product that is stable and highly reproducible without any cracks can be produced.

DESCRIPTION OF EMBODIMENTS The present invention will be described below along with one embodiment. The sample preparation process involves using industrial raw materials (purity of 98 or higher) such as TiO2, MgO, Zr0z, Nd2O5, La2
0g was used, and wet mixing was performed using a urethane-lined bot mill to prevent contamination with impurities. The order of sample preparation is to mix the raw materials to have the composition ratio shown in Table 1 below, and to mold them using a mechanical press to form a 60 x 150 x 1611 [
A sample was molded. The main firing is performed using an electric furnace at a temperature of 130°C.
Firing was performed between 0 and 14 oo<0>C.

That is, from Sample 1 to Sample Arashi 9, the porcelain for the magnetic head stopper was 36 to 60% by weight in terms of Mgf MgO, and 35 to 60% by weight in terms of Ti in terms of TiO2.
, Zr'f: 0.2-6.0 in terms of ZrO2
Weight staff.

At least one rare earth element oxide 0602 to 6.0
The raw materials are mixed to have a composition ratio containing 0% by weight.

In Sample No. 0.10 to Sample No. 13, the raw materials were mixed to have a composition ratio other than the above.

(Left below) Table 1 Table 2 shows the characteristics of the element bodies obtained using the composition ratios shown in Table 1 above.

In Table 2, the method for measuring the number of chipping occurrences is 10X10X10071! ff sample was cut in the length direction (10 mm) using a diamond high-speed rotary cutter, and the number of chips on the cut surface was measured using an optical microscope equipped with a micrometer. The conditions for use of the diamond high-speed rotary cutting machine (diamond cutter rotation speed, sample feeding speed) are constant. The number of testimonials is 100.

The number of chippings was expressed as an average value per 1 oaA of cutting cross-sectional area. Further, at the bottom, alumina, which has been conventionally used as a material for porcelain for magnetic head fasteners, is shown for comparison.

As is clear from Table 2 above, in samples from seed 1 to sample size 9, the chipping incidence during machining was significantly lower, resulting in less mechanical strength, 9 color irregularities in bore distribution, etc.

○Switch test No. 41 showing excellent characteristics in terms of characteristics
From +x 10 to 13 sample sizes, chipping occurs during machining and adverse effects on bores, etc. appear. That is, Mg
When the O content was less than 366% by weight, color unevenness occurred due to the firing atmosphere, and the degree of wear was higher than that of the one-year-old ferrite. Furthermore-
When MgO exceeds 600% by weight, machinability deteriorates and the incidence of chipping increases. And TiO2 is 3
When the content was less than 55% by weight, the degree of wear was lower than that of ferrite, and the sinterability was lowered. Further, if the TiO2 content exceeds 600% by weight, abnormal grain growth occurs, the bore distribution becomes poor, and the mechanical strength decreases by 1 level. Abnormal grain growth cannot be suppressed when ZrO2 has a weight ratio of 0.2 and no vortex. If the content exceeds 6% by weight, sinterability deteriorates. Furthermore, 1 of rare earth element oxides
If the stacking or two or more types are less than 0,022% by weight, ZrO2
Segregation of phases occurs, and if it exceeds 6% by weight, segregation of rare earth element oxides occurs and the incidence of chipping increases. As the porcelain for the magnetic head stopper, the ferrite element is embedded in the porcelain (stop) using adhesive glass as a medium.
The relationship between thermal expansion coefficient, thermal shock resistance 9 mechanical strength, bore distribution, etc. is very important, and as a material that satisfies these conditions, the compositions shown in the sample height 1 to sample NCL 9 dimensions are used. The produced porcelain body is a JI whose thermal expansion coefficient can be freely controlled.
I can do it.

In each example, Mg was used as a raw material to obtain the magnesium component.
O was used, but MgCO5, Mg(42, Mg(OH)2
Although Nd2O5 was used as the neodymium component, good characteristics were also obtained using raw materials such as Nd2(Cos) carbonate and oxalate.Furthermore, Nd2O5 and LIL205 were used as rare earth element oxides. However, even when using SmO2゜Pr205CeO2, etc., good properties were obtained. Effects of the invention As described above, according to the present invention, Mg is 35 to 60% by weight in terms of MgO, and Ti f is 35 to 60% by weight in terms of MgO. 35-60% by weight of ZrF, 0.2-6.0% by weight in terms of ZrO2, and 0.02-5.00% by weight of at least one type of rare element oxide. This component constitutes the porcelain for the magnetic head stopper.The coefficient of thermal expansion can be freely changed depending on the purpose, and it can provide the same level of abrasion resistance as the magnetic head.It also has strong thermal shock resistance and high mechanical strength. It is possible to improve the bore distribution by eliminating color unevenness, and has great industrial value.

Claims (1)

[Claims] 35-60% by weight in terms of MgtMgOK, Ti
02, 36-60% by weight, Zr
Porcelain for a magnetic head stopper, containing 0.2 to 5.0% by weight in terms of r0z and 0.02 to 6.00% by weight of at least one rare earth element oxide.