JPS62143872A - Fused ceramics - 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 [Industrial Field of Application] The present invention relates to fused ceramics, particularly fused ceramics used as a magnetic plate material.

[Conventional technology]

Magnetic magnets are used in audio equipment, video tape recorders, computers, etc. to record information, +
It is a component that plays the role of erasing function, and is made of N1~Zn ferrite, Mn-Zn ferrite, Barbroy (Fe-Ni
), Sendust (Fe-AI-9i), and other magnetic materials;

In recent years, the demand for high-density recording of information has increased, and technologies such as miniaturization of magnetic materials and thinning of magnetic materials are progressing. The following characteristics are desired.

In other words, (a) In order to quickly dissipate the generated heat that tends to fluctuate the magnetic properties when using the magnetic hand, the thermal conductivity is approximately 2.
．． 5 Kcal/a+, hr, 'c or higher, (b) In order to improve the adhesion with the magnetic material, approximately 80 to +50 XIO' depending on the type of magnetic lumber 1.
/'017), being able to choose a range of thermal expansion coefficients, (
c) In order to prevent one edge from forming due to friction with magnetic tapes and disks, the magnetic material described in 1j must have a hardness equivalent to i,
That is, about 400 to 900 in Pinkers hardness (Hv)
It must have a value in the range of Kg/:=, (d) It must be dense with no microbubbles, (e) The structure must be homogeneous and fine, (f) It must have constant quality and excellent productivity, etc. is desired.

Therefore, in order to meet these demands, various materials have been proposed using melting methods and sintering methods. this house,
For example, crystalline glass and fused alumina are known to be produced using the melting method, but the former has an inappropriate thermal conductivity that is too low, and the latter has a thermal conductivity of about 18
It requires high temperatures of 00°C or higher and is difficult to produce. There are many known sintering methods, such as those based on TlO2-alkaline earth metal refractories, but the melting method is limited to three main steps: 1 culm or 1 culm, 1 culm, melting, and forming. However, each requires a complicated 6F process of pulverizing the raw material powder, mixing, pre-sintering, crushing, molding, and final sintering, and it is difficult to perform continuous process operations. ,
Goods - poor productivity. Furthermore, the sintering method involves heating and fixing nodules or particles in a matrix material, which tends to be inferior in terms of density, fineness of structure, and thermal conductivity, and also has poor quality. There is also the drawback that complex and advanced technology is required to stabilize the value.

"Problems to be Solved by the Invention" The purpose of the present invention is to comprehensively eliminate the various drawbacks found in the above-mentioned prior art, while maintaining an appropriate coefficient of thermal expansion and hardness.
An object of the present invention is to provide a substrate material for a magnetic head that has improved thermal conductivity, density, fineness of structure, and productivity.

[Means for Solving the Problems] The name of the present invention is as follows.In order to achieve the above-mentioned goal, we have conducted various tests and researches, and have surprisingly found that the above-mentioned conventional ceramics of TiO□-ZnO composition system It has been found that there is a compositional range that can be melted under much more favorable temperature conditions than molten ceramics, that is, below about 1600°C, and unlike those produced by the sintering method, this molten ceramic It has been found that after being homogenized in a state, it can be obtained as a material with a dense structure, and moreover, it can satisfy the above-mentioned requirements for the magnetic head substrate material 1. The present invention has been completed based on the above findings.

The characteristics of the molten ceramic and clay of the present invention are that in mol%, TlO
23-80%, ZnO 5-70%, Mg0 0-20
%, Ca0 0-60%, 5rO0-20%, 8a0
0-20%, PbO 0-25%, Al2O30-25
%, Cr2O30-10%, La2O30-25%,
ZrO20-25%, Mn020-25%, Nb205
0~25%, Ta2050~20%, WO30~20%
, MoO30~20%, L120+Na2O+20+C3200~15%, 5
lO7+ 8203 + P2O5+ GeO2Q ~
15%, and also contains fluorine (F) substituted with - part of oxygen (O) of gold-11 oxide, with an ion number of 17 (F-/) for oxygen (O). 0 to 0 at O2-)
．． The present invention is made by melting a composition containing within the range specified in item 4 above.

Among the components described in 1-1, TlO2 and ZnO can be made into a molten yE when they coexist, and this melt can be cooled without producing minute bubbles or coarse crystals. '
, 1, which makes it possible to obtain ceramics with appropriate thermal expansion coefficients and hardness, and is therefore an important basic component in the present invention. However, to obtain these effects, the TiO7 and ZnO components need to be in the range of 3-80% and 5-70%, respectively.

In addition, each of the following components can be added to the water composition within the predetermined ranges described below. Added it because it's a role game?
1L, but since the meltability deteriorates, it should be less than 20%. C
The aO component serves to expand the meltable composition range of ceramics and facilitate melting.
If it exceeds %, the melting property will deteriorate on the contrary. SrO and Ba
Each component of O is a ceramic? It is useful for increasing the A IIv elongation, but if the edge exceeds 20% in any case, 4-shaped coarse crystals are likely to form during cooling after melting.

PbO can expand the compositional range in which melting is possible, but 25
%, the thermal expansion coefficient or hardness of the ceramic inx tends to decrease.

Each component of Al2O3 and Cr203 (7) is useful for adjusting the hardness of ceramics, and is 25% and 10%, respectively.
If it exceeds , the coefficient of thermal expansion tends to be too small, and in addition, in the former case, the thermal conductivity also tends to be too small. MnO2, Z
rO2, Nb2O5, Ta205 and 11103 are also useful for adjusting hardness, but if the first three exceed 25% each and the latter two exceed 20%, the ceramic will
During cooling, coarse pores are likely to be generated, the melting properties are deteriorated, and coarse crystals are formed, making it easier to sip. , L
+20, Na2O, K2O and Cs20 components and S+02, B2O3, P2O5 and GeO2 (7)
Each component expands the meltable composition range (it has movement, but the total of one or more of the former four is 15
%, the hardness tends to decrease, and the latter four
If the total amount of the species or two or more species exceeds 15%, the thermal conductivity tends to be too low.

La2O3, MoO3, and the fluorine (F) component that replaced a part of the oxygen (O) in the oxide component of each metal is 2. a
In addition, it is preferable to add one or more of these components -F-, since it has the effect of significantly increasing the thermal conductivity of the ceramic of the present invention. At this time, La2
The content of O3 should be within 25% to avoid deterioration of meltability, and the content of MoO3 should be within 20% to avoid excessive hardness. It is preferable that the total amount of species is 1% or more. Also, 弗, 1 (F) ji! In order to exhibit the L effect and not to reduce the hardness, F 10
The value of 0. It is preferable to set it as the range of O1-0.4.

The molten ceramic composition of the present invention is required to contain components in the ranges listed below, but in addition to these, other components such as noble metal oxides, Y2O3, GeO3, Tb2
O3, Yb2O3, 5n02, Y2O5, As2O3,
5b203. Bi2O3, Fe2O3, Coo, N
iO, and one or more of metal nitrides, carbides, sulfides, selenides, chlorides, bromides, and iodides of metals and metal oxides, if necessary, 15 mol in total. It can be added up to about %.

〔Example〕

Next, examples of fused ceramics according to the present invention will be described.

Table 1 shows three composition examples of fused ceramics according to the present invention.
Five examples are shown. First, ingredients such as oxides, hydroxides, carbonates, nitrates, and fluorides are mixed to obtain these compositions, and then melted using a platinum melting device depending on the difficulty of melting depending on the composition. approx. 1400~1600℃, 1~
Melt for 10 hours. During this time, stirring is performed as appropriate for homogenization. Thereafter, the melt is poured into a mold and shaped, approximately 8
Molten ceramics can be obtained very easily by placing the ceramic in a furnace kept at a temperature of 00 to 1400°C and slowly cooling it. In the case of this example, the manufacturing process is much simpler than the conventional sintering method, so the raw+1r'AJ rate is greatly improved. →251. Lead is also a metal, has no bubbles, and has an extremely fine structure. The thermal conductivity of these samples,
The results of the measurement test of thermal expansion coefficient and Hirakas hardness are also listed in Table-1. Here, between the examples in Table 1, 1 to No.
, for IO, between 1 and TiO2, ZnO, CaO
The basic M1 composition consists of and Al2O3, positive 8.2 ~
N.

, 10 is added to this with La2O3, MoO3 and fluorine (F
) shows the changes in various physical properties when adding 20% of the material. Among these physical properties, it can be seen that the anti-thermal effect on thermal conductivity is particularly remarkable.

As shown in Table 1, the molten ceramics obtained according to the examples of the present invention have a thermal expansion coefficient and hardness of 1, as well as improved thermal conductivity, and a homogeneous fine structure. Because I do.

It is suitable for use as a hole plate material 1 for a magnetic head.

In addition, when manufacturing the molten ceramics of the present invention, j,
Examples include, but are not limited to, the examples described above.
) Other known fluorine-introducing raw materials may be appropriately used as additive raw materials. In addition, the melting device is not made of ilt metal such as platinum,
If necessary, one made of graphite may be used in a nitrogen atmosphere.

(The following is a blank space) [Efficacy of the invention] As described in 1- below, the molten ceramic of the present invention has the following properties:
TiO2-Zn has been found to have meltability over a wide range
Since it is made by melting an O-based composition, it maintains an appropriate coefficient of thermal expansion and hardness, and improves the homogeneity, density, fineness, and thermal conductivity of the product M1 weave compared to those made using conventional sintering methods. In addition to improving product productivity, it is possible to significantly improve product productivity.

In addition, the temperature conditions during melting and the thermal conductivity of the product can be improved compared to conventional melting methods.

Therefore, the fused ceramic of the present invention is not only particularly suitable as a substrate material for a magnetic helix, but also can be used in various applications such as other electronic fields where various properties are desired.

Claims (3)

[Claims] (1) In mol%, TiO_23-80%, ZnO5-7
0%, MgO0-20%, CaO0-60%, SrO0
~20%, BaO0~20%, PbO0~25%, Al
_2O_30-25%, Cr_2O_30-10%, L
a_2O_30-25%, ZrO_20-25%MnO
_20-25%, Nb_2O_50-25%, Ta_2
O_50-20%, WO_30-20%, MoO_30
~20%, Li_2O+Na_2O+K_2O+Cs_
2O0~15%, SiO_2+B_2O_3+P_2O
_5+GeO_20 to 15%, and the amount of fluorine (F) substituted for part of the oxygen (O) in the metal oxide is the ion number ratio (F^-/O^2^-) to oxygen (O). 0
1. A fused ceramic characterized by being formed by melting a composition having a viscosity of 0.4 to 0.4. (2) (La_2O_3+MoO_3≧1%) and/
or (F^-/O^2^-≧0.01), The fused ceramic according to claim (1). (3) The molten ceramic according to claims (1) and (2), wherein the molten ceramic is used for a magnetic head substrate.