JPH01242441A - Glass composition for joining - Google Patents

Abstract

PURPOSE:To form a glass compsn. for joining capable of surely joining magnetic cores to a slider even at somewhat ununiform heating temp. by mixing plural kinds of glass powders having different melting temps. CONSTITUTION:Plural kinds of glass powders having different melting temps. are mixed to form a glass compsn. for joining. When magnetic cores 2 are joined to a slider 1 with the glass compsn., sure joining can be carried out even at somewhat ununiform heating temp. because glass powder which melts surely is necessarily present and the control of heating temp. is facilitated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a glass composition for joining the core of a magnetic head;
In particular, the present invention relates to a bonding glass composition suitable for bonding a core and a slider of a floating magnetic head.

[Conventional technology]

Conventionally, in a floating magnetic head, as shown in FIG. 1, a slider 1 made of ceramics, non-magnetic ferrite, glass, etc., and a magnetic core 2.2 made of ferrite, etc.
There is a composite type with embedded . The slider 1 and the magnetic core 2 are bonded by forming a bonding layer 3 using synthetic resin or glass having a lower melting temperature than the glass used to form the gap of the magnetic core 2. .

[Problem to be solved by the invention]

However, when bonding is performed using synthetic resin, heat resistance, environmental resistance, chemical resistance, etc. are inferior, and there is a problem that the bond lacks reliability. On the other hand, when glass with a lower melting temperature than gap-forming glass is used, it has excellent heat resistance, environmental resistance, chemical resistance, etc. In order to pour
It is necessary to strictly control the temperature during glass melting. For example, if this temperature is too high, the gap-forming glass will soften, resulting in a disadvantage that the gap viscosity will decrease.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a bonding glass composition that can reliably bond a magnetic core and a slider even if the heating and melting temperature of the glass varies to some extent. It is something to do.

[Means to solve the problem]

A glass composition for bonding is prepared by mixing a plurality of types of glass powders each having a different melting temperature.

[For production]

During bonding, even if the heating melting temperature varies somewhat, there is always glass that reliably melts at that temperature, so reliable bonding is possible.

(Example) For example, the melting temperature is 500°C, 550°C, 600°C.

4 types of lead-alkali glass powder at 650℃
Mix 8 amounts each, and add clay and barium chloride to this mixed powder.
About 5 to 10% by weight of a binder with Z is added, and this is suspended in a solvent such as water to obtain a highly viscous paste composition. The particle size of each of the above-mentioned glass powders is preferably about 50 μm.

An appropriate amount of the paste-like bonding glass composition obtained in this manner is applied to the required locations on the surface of the recessed portion of the slider 1 to which the magnetic core 2 is to be bonded, and after the magnetic core 2 is incorporated, it is placed in a heating oven and heated. to melt and bond the composition. At this time, even if the heating temperature fluctuates, if the lower limit of variation is 500° C., the glass powder in the glass composition having a melting temperature of 500° C. will be melted and bonding will be performed. Furthermore, even if the heating temperature varies within the range of 550°C to 600°C,
A glass powder having an i@i degree of 00° C. and one or both of a glass powder having a melting temperature of 550° C. and a glass powder having a melting temperature of 600° C. are melted and bonded.

In this way, if this glass composition is used for bonding, there will always be glass powder that will reliably melt even if the heating temperature varies to some extent, making it possible to ensure reliable bonding and to easily manage the heating temperature. Furthermore, since it is in the form of a paste, it is easy to handle, which improves the workability of assembling the magnetic head.

In addition, during this heating, the glass powder that is not melted remains dispersed in the molten and solidified glass in a powder state, so the unmelted glass powder functions as a binder, increasing the strength of the joint. This also improves wear resistance.

Note that the mixing ratio of each glass powder to be mixed does not need to be equal as described above, but it is necessary to mix a large number of glass powders with a melting temperature close to the set heating temperature, and make the glass powder that actually melts. The amount of can also be increased. Also,
There is no need to set the interval between glass melting temperatures to 50°C, and 2
It may be set at intervals of 5 degrees Celsius, or even 600 degrees Celsius, 620 degrees Celsius,
It goes without saying that the intervals may be irregular, such as a combination of temperatures of 660°C, 710°C, etc. Furthermore, the glass composition for bonding of the present invention does not necessarily have to be in the form of a paste, but may be in the form of a highly viscous liquid such as a glaze, or even in the form of a powder by devising an applicator or the like. It can be used even if

(Effects of the Invention) As explained above, since the bonding glass composition of the present invention is made by mixing a plurality of glass powders with different melting temperatures, there is some variation in the heating temperature during melt bonding. Even if the heating temperature is higher than that, one or more glass powders will always melt and a reliable bond can be achieved.For this reason, the allowable range of heating temperature fluctuations can be widened, making it easy to manage the heating temperature. This improves productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a floating magnetic head to which the bonding glass composition of the present invention is applied. Applicant Alps Electric Co., Ltd. Representative Kataoka Kataoka

Claims (1)

[Claims] A bonding glass composition made by mixing multiple glass powders with different melting temperatures.