JPH0339490A - Production of enameled substrate and thermal head and motor bearing using the same - Google Patents

Abstract

PURPOSE:To form a crystallized enameled substrate in which crystallites are deposited and having a smooth surface by calcining the crystallized glass coating a metallic substrate at a specified temp. to make the glass amorphous, then hot-pressing the glass and then sintering the glass. CONSTITUTION:The metallic substrate 1 is coated with crystallized glass 3, the glass is calcined below the glass crystallization initiating temp., and a glass film in which crystals are not deposited is obtained. The enameled substrate is hot-pressed in a specularly finished metallic mold at the temp. higher than the deflection point of glass and lower than the crystallization initiating temp. Consequently, the ruggednesses on the glass surface are leveled, and a vitreous enameled substrate having a specularly finished flat surface is obtained. The substrate is further sintered above the crystallization initiating temp., and an enameled substrate in which crystallites are deposited and having a smooth surface is obtained.

Description

Detailed Description of the Invention Industrial Application Field of the Invention CL Prior art related to a method for manufacturing a hollow board that can be used as a wear-resistant part such as a circuit board, a thermal head board, or a motor bearing. The method for manufacturing a water-based substrate for a thermal head will be described in detail by taking as an example, a glass frit prepared by melting and cooling is milled in a ball mill to prepare a slurry for electrodeposition with an average particle size of 2 to 3 μm. A metal substrate such as a steel plate for hollow holes is immersed, and a DC voltage is applied between the counter electrode and the metal substrate to electrodeposit glass frit particles onto the metal substrate.Then, the substrate is sufficiently dried and fired to form an insulating hollow hole for thermal heads. Forming the substrate The surface roughness of the insulating hollow substrate for the thermal head formed by this method is 0.0 in terms of center line average roughness Ra.
5 to 0.08 μm, compared to the conventional hollow substrate (Ra:
However, the smoothness of the hollow substrate according to the above-mentioned conventional example does not improve the smoothness of the hollow substrate (0.15 to 0.3 μm).
When the conductive circuit of the thermal head is formed on the substrate surface,
Because of the large variation in resistance, it is not very satisfactory as a substrate for a thermal head (t4) Means for Solving the Problem In order to solve the above-mentioned conventional problems, the present invention is based on a method of coating crystallized glass on a metal substrate. MLA Temporary firing at a temperature below the crystallization starting point of the glass to make the glass amorphous Heat pressing at a temperature above the yielding point of the glass and further firing at a temperature above the crystallization starting point of the glass When a hollow metal substrate is coated with crystallized glass and calcined at a temperature below the crystallization starting point of the glass, a glass film with no precipitated crystals is obtained. Ra of the glass surface in this state
l; L O, approximately 05 μm to 0.08 μm,
Ra of alumina glaze substrate (0,01μm-0,00
6, um), so the temperature of the hollow substrate is set at a temperature range of above the deformation point of the glass and below the crystallization starting point, using a mold with a mirror-finished surface. As a result, the unevenness of the glass surface is leveled, creating a smooth glassy hollow substrate with a mirror-like surface.Furthermore, when the substrate is fired at a temperature higher than the crystallization starting point, the surface is smooth and crystallized, with microcrystals precipitated. A hollow substrate can be formed.Examples Examples of the present invention will be described below.Example 1: A metal substrate is degreased, washed with water, pickled, washed with water, nickel plated,
Signs that pretreatment was performed by washing with water.Glass particles having the composition in Table 1 were immersed in a slurry consisting of glass particles having the composition in Table 1 with an average particle size of 7 μm, and a DC voltage was applied between the counter electrode and the metal substrate. is coated on a metal substrate with a thickness of 150 μm and its resistance is
The substrate was pre-baked for 10 minutes at a temperature of 730℃, which is below the crystallization starting point of glass, and then the substrate was heated to 680℃ and hot pressed using a mold (Rag, 0.06μm) with a mirror-polished surface for 2 minutes at 5kg/cm''. ).A hollow substrate was formed by firing at a temperature of 900°C, above the crystallization starting point, for 10 minutes.The thermal head shown in Figure 1 was formed on this substrate. 1 is a cross-sectional view of a thermal head using a hollow substrate according to an embodiment, in which 1 is a metal substrate 2 which is nickel plated, 3 is a hollow glaze, 4 is a heavy state 5 is a heating resistor, and 6 is an overcoat layer.

<Example 2> Metal substrate was degreased, washed with water, pickled, washed with water, nickel plated,
The glass particles having the composition shown in Table 1 were immersed in a slurry of glass particles having the composition shown in Table 1 and having an average particle diameter of 7 μm, and a DC voltage was applied between the counter electrode and the metal substrate. is coated on a metal substrate with a thickness of 150 μm and its resistance is
The substrate was calcined for 10 minutes at a temperature of 730°C, which is below the crystallization starting point of glass, and then heated to 680°C and hot pressed using a mold with a mirror-polished surface (Rag, 006 μm) (51 (g/cm)). The hollow substrate was formed by firing for 10 minutes at a temperature of 900°C, which is above the crystallization starting point, and this substrate was used as a bearing for the compact tires motor shown in Fig. 2. 1 is a cross-sectional view of a compact disc motor according to this embodiment, in which 7 is a bearing of the motor made of a hollow substrate according to this embodiment, 8 is a commutator, 9 is a shaft, and 10 is a motor case.

<Comparative Example 1> Metal substrate was degreased, washed with water, pickled, washed with water, nickel plated,
The glass particles having the composition shown in Table 1 were immersed in a slurry of glass particles having the composition shown in Table 1 and having an average particle diameter of 7 μm, and a DC voltage was applied between the counter electrode and the metal substrate. was electrodeposited to a thickness of 150 μm on a metal substrate, and dried and fired (90 μm).
Comparative Example 2 A conductive circuit for a thermal head was formed on an alumina glaze substrate in the same manner as in Example 1.Comparative Example 2 1゜〈Comparative Example 3〉 Metal substrate was degreased, washed with water, pickled, washed with water, nickel plated,
The glass particles having the composition shown in Table 1 were immersed in a slurry of glass particles having the composition shown in Table 1 and having an average particle diameter of 7 μm, and a DC voltage was applied between the counter electrode and the metal substrate. was electrodeposited to a thickness of 150 μm on a metal substrate, and dried and fired (90 μm).
Comparative Example 4: Similar to Example 2, a polyester film was used for the bearing part to create a compact disc motor. Example 1,
For Comparative Examples 1 and 2, the centerline average roughness Ra on the substrate surface and the resistance variation of the heating resistor of the thermal head were measured and compared. The results are shown in Table 2.

Table 2 Table 3 Also, for Example 2 and Comparative Examples 3 and 4 (Tomo) A load of 500 g was applied to the motor, it was rotated at a speed of 500 rpm, and the amount of wear on the bearing was measured after 2000 hours.
The results are shown in Table 3.

As described above, when a viscous thermal head is made by leveling the glass surface by heat pressing to reduce the surface roughness of the substrate, the variation in resistance value can be extremely reduced.Similarly, the hollow substrate of the present invention can be made compact. It has been confirmed that the wear characteristics of the bearing can also be improved by applying it as a bearing for a disk motor. Therefore, a hollow substrate with excellent surface properties cannot be formed.If the temperature of the calcination is set above the crystallization starting point, crystals will precipitate, making it difficult for the glass to soften. The surface of the glass is not leveled (1. Also, if the temperature of the hot press is set above the crystallization starting point, crystals will precipitate, so the surface will be leveled. Similarly, if the temperature is set below the sagging point, the glass will not soften, so it will not be leveled. Therefore, the pre-calcination temperature must be below the crystallization starting point, and the hot pressing temperature must be within the temperature range from the yielding point to the crystallization starting point. After coating the glass on a metal substrate and pre-sintering the glass at a temperature below the crystallization starting point of the glass to make the glass amorphous, the glass is heat-pressed at a temperature above the deformation point of the glass. By forming a hollow substrate by firing at a temperature above the crystallization starting point, the surface properties of the hollow substrate are improved and its viscosity is reduced.It also reduces resistance variation when used as a thermal head and wear characteristics when used as a motor bearing. can also be improved

[Brief explanation of drawings]

Fig. 1 shows the cross-sectional structure of a thermal head using a hollow substrate according to the first embodiment of the present invention, and Fig. 2 shows a cross-sectional structure of a compact disc motor using a hollow substrate according to the second embodiment of the present invention. be. 1...Metal board 2...Nickel plating 3...
・Hollow 4...Electric plate 5...Heating resistor 6・
... Overcoat 凰 7 ... Axis view of the motor made of hollow board 8 ... Commutator, 9 ... Shaft,
lO...motor ke person

Claims (3)

[Claims] (1) Coat crystallized glass on a metal substrate, make the glass into an amorphous state by pre-sintering it at a temperature below the crystallization starting point of the glass, and then heat press it at a temperature above the yielding point of the glass. A method for producing a hollow substrate, further comprising firing at a temperature equal to or higher than the crystallization starting point of the glass. (2) A thermal head characterized by using a hollow substrate obtained by the manufacturing method according to claim 1. (3) A motor bearing characterized by using a hollow substrate obtained by the manufacturing method according to claim 1.