JPH02279571A - Joining method - 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 application field 1 The present invention relates to a ceramic-metal bonding method.

[Summary of the invention] To provide a joining method in which ceramics and metals or soft metals having a similar coefficient of thermal expansion are joined as a bridge without overlapping the ceramics and the metals, and stress generated is alleviated by leaving gaps between the ceramics and the metals.

[Prior art] Conventionally, as shown in Fig. 2, the bonding of ceramics and metals is performed by placing a stress relaxation material 3 (a soft material such as copper or nickel) between the ceramic 1 and the metal 2, and using a bonding material 4. It was connected.

[Problem to be solved by the invention 1 In the conventional method, as shown in FIG.
must be made thicker as the generated stress increases, resulting in a thicker bonded body.

In addition, if corrosion resistance is required for the joint, stress relaxation material 3
It had the disadvantage that it was necessary to apply gold plating to the surface before joining.

1. Means for Solving the Problems] In order to solve the above problems, 1 the present invention provides a method of arranging ceramics and metals on metals or soft metals having a similar coefficient of thermal expansion to ceramics without overlapping them with a gap between them. The gap is adjusted and bonded according to the magnitude of the generated stress.

[Operation J] According to the above joining method, the generated stress can be alleviated by adjusting the distance between the materials to be joined according to the magnitude of the generated stress.

[Example j The present invention will be explained below based on examples.

[Example 1] FIG. 1 is a sectional view showing a first example of the joining method according to the present invention. The ceramic 1 and the metal 2 are placed apart from each other on the stress relaxation material 3, and are respectively bonded to the stress relaxation material 3 by a bonding material paulownia 4. According to this embodiment, by adjusting the distance 5 between the ceramic 1 and the metal 2,
Even though stress of different magnitude was generated depending on the combination of ceramic 1 and metal 2, which are the material phases to be joined, a highly reliable joint was obtained without cracking. Here, Table 1 shows the results of reliability tests on the joints of specific combinations of materials to be joined using various stress-relaxing materials. Although some combinations have problems with corrosion resistance, Regarding the bonding strength, in all combinations, the stress generated was able to be relaxed.5 Strength that could withstand practical use was obtained.9 The results in Table 1 show that the thickness of Ceramic 1 and Metal 2 is 2 mm, and the thickness of Stress Relaxation Material 3 is 2 mm. The value is based on a thickness of 0.5 mm, and the corrosion resistance was evaluated for discoloration, corrosion, etc. at a distance of 5 between the joined bodies, since the back side of the joined body is practically sealed with parts.

Corrosion resistance I: Artificial sweat intermittent 3 cycles Corrosion resistance I ■: Salt water spray 5 cycles [Example 21] FIG. 3 is a sectional view showing a second example of the joining method according to the present invention. The ceramics 1 and the gold 11i2 are placed separately on the stress relaxation material 3, and are respectively joined to the stress relaxation material 3 by the bonding material 6, and at the same time, the exposed portion of the stress relaxation material 3 is bonded to the bonding material at a distance 5. It was covered with T46. According to this example, ceramic 1 and metal 2
By adjusting the distance 5 between the two materials, even if stresses of different magnitudes were generated depending on the combination of the ceramic 1 and metal 2, which were the materials to be joined, no cracking occurred and a highly reliable joint was obtained. At the same time, connect the exposed part of the stress relaxation material 3 with the bonding material. ! 46, the corrosion resistance was good in all combinations.1 Table 2 shows the reliability of the joints when various stress-relaxing materials were used to join the materials, with specific combinations of materials to be joined. The test results are shown in Table 2, in which the stress generated by 1 was relaxed in all combinations, and strength and corrosion resistance sufficient for practical use were obtained.Table 2 shows that the thickness of ceramic 1 and metal 2 was 2 mm This is a value when the thickness of the relaxation material 3 is 0.5 mm.

Table 2 [Effects of the Invention] As explained above, according to the present invention, compared to the conventional method, the stress relaxation material can be made thicker without increasing the thickness.

This method had the effect of alleviating the stress generated simply by adjusting the spacing between the materials to be joined.

[Brief explanation of drawings]

1 is a sectional view showing a first embodiment of the joining method according to the present invention, FIG. 2 is a sectional view showing a conventional joining method, and FIG. 3 is a sectional view showing a second embodiment of the joining method according to the present invention. FIG. Ceramics Metal Stress Relief Materials Bonding Materials Applicant: Seiko Electronics Co., Ltd. Agent Patent Attorney Takayuki Hayashi Cross-sectional opening shown as the first circular A-row of the gripping method according to the invention of the cross-section 1 Fig. 41 Captured by the man Figure 3 shows the second part of the law.

Claims (1)

[Claims] When joining ceramics and metals, arrange ceramics and metals on metals or soft metals with a thermal expansion coefficient similar to that of ceramics, with a space between them, and join ceramics and metals to metals or soft metals with thermal expansion coefficients similar to ceramics. A joining method characterized by joining by materials.