JPS59213672A - Non-magnetic ceramics for magnetic head - 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 The present invention is used as a slider or spacer that is indispensable for the construction of various magnetic heads such as skewers and slave computers, especially (Ni-Zn) ferrite + a-air heads for floppy disks. It is 131 times more suitable for non-magnetic ceramics.

When manufacturing a magnetic head, ferrite and nonmagnetic ceramics are bonded using glass.

If the coefficients of thermal expansion of the ferrite and the nonmagnetic ceramic are different, it is undesirable because the material may be damaged or distortion may be left in the product during heat treatment during assembly of the magnetic head.

In addition, if there are many holes in non-magnetic ceramics, for example, when a magnetic head and a floppy disk come into contact with each other and run, the magnetic powder coated on the disk may adhere to the holes or cause chipping, which may cause the magnetic head to Small wall holes are required to avoid floppy disk damage.

The thermal expansion coefficient of Ni-Zn ferrite is said to be 80 to 100 x 10-7//C at 25 to 400°C, and the thermal expansion coefficient of non-linear ceramics can also be changed arbitrarily within this range. Moreover, it is essential that the car be able to be manufactured stably.

Conventionally, Tie, (24 to 52 wt%)-CaCO3 (27
~60wt%% Cn02 and MgO are added to adjust the thermal expansion coefficient and increase the density, thereby improving mechanical independence. For this reason, even if one coefficient of thermal expansion is taken, the composition required to adjust it to the desired value is complicated.

The present invention improves the drawbacks of the above-mentioned prior art.

The thermal expansion coefficient is controlled by the composition ratio with CaO.

Additives reduce porosity, homogenize crystal grains, and improve mechanical strength.

It is something that Based on the phase diagram of 'I'102-CaO, Akira Honmoto said that in the two-phase female constant region of TiO2-CaO, TiO,
Cab, Tie.

It was considered that there is a one-to-one correspondence between the coefficient of thermal expansion and the presence of the compound. In order to confirm this, the cause of the variation in conventional materials is that the raw materials of TiO□ and CaCo are
I thought that this was because I was using a material with a cotton content of 99.9, and experimented with using raw material with a cotton content of 99.9.

In addition, as a sintering aid for ship, ml, itl, Sin2Mg0.ZrO2, IJ aOr S
It was found that rO etc. are effective.

The speed of the present invention will be measured from the implementation example IV below. TiO2 and CaCC books use raw materials with a purity of 99.9 degrees or higher,
Addition of Sin, , MgO, ZrO2, BaO, SrO#! 99.9% or more of t,'(!a) was also recovered.Testwise, the raw materials were blended in the composition ratio of the first yen, respectively, and mixed wet (J%) in a ball mill. After drying ρξ,
Crushed and packed in alumina box, 1000~1150
mj calcination was carried out at a temperature of 2 to 5 hours. After pulverizing the calcined powder, it was molded under a pressure of 1.0 to 2.0 mm. The main firing was performed in the air at a temperature of 128° to 1580'C. Obtain the density, heat, and tensile coefficient of the sample!
(The results are shown in Table 1.

Table 1 below shows that the coefficient of thermal expansion tends to decrease linearly with the amount of TiO2, and the relative coefficient K tends to increase with the amount of Tie. Furthermore, the addition of the additives shown in Table 1 did not affect the coefficient of thermal expansion. It was also found that although the relative density did not change significantly with the addition of additives, the grain size decreased and the pores also became smaller.

FIG. 1 shows the relationship between the moltenness and thermal expansion coefficient of TiO□. From the figure, the thermal expansion coefficient of Ni-Zn ferrite is 80~I
The range that matches DO(Xi O-7,/'C) is i
'i U2 should be in the range of 7D to 90 moles. According to the present invention, the thermal expansion coefficient of Tie, -Ca02 element can be arbitrarily changed in the range of 80 to 1oo (x1 [lJ/C) only by the composition of 'I'i02 and (:aO). 5i02.ZrO3, ~Igo
, if additives such as BaO, SrO, etc. are also 5 wt% or less,
It is possible to achieve finer grain size, homogenization, and higher density without changing the coefficient of thermal expansion. Therefore, according to the present invention, in order to investigate the coefficient of thermal expansion, unlike the conventional method,
There is no need to worry about changing additives (the industrial effect is great).

[Brief explanation of the drawing]

Figure 1 shows the mol% of 'I'i02 in the TiO2-CaO system.
,1111(') Otsu1'l' 1 pile of non-magnetic ceramics for magnetic head 11. '1:4 Ru old! 1 ・5()8・Ii 1'f :i' Niji・
A f! 2. (Public corporation fee b, i,
,i! l'i' Nori Hiiri
” A person 1 fii j) Mi command day iq May 29, 1981
Day (Shipping port) 1 Yu 11 ()) Yo・1 5 (
1. “Name of invention” column of specification ■

Claims (1)

[Claims] 1. TiO270-90-e/I/%, CaO
A non-magnetic ceramic for a magnetic head characterized by comprising 50 to 10 mo/l/%. 2. 'f'10270~90Mo/L/%, Ca
The basic composition is 050 to 10-e k %, Sin,
, MgQ ZrO 3 , and BaQ SrO, the non-magnetic ceramic for a magnetic head according to claim 1 is added with 0.2 to 4 by weight of a small amount (both 1 ψ) selected from among , MgQ ZrO 3 , and BaQ SrO.