JPH0711305A - Method for joining injection molded articles of metallic powder and ceramic powder - Google Patents

Abstract

PURPOSE:To join the plural molded articles molded by an injection molding method from a compd. composed of metallic powder or ceramic powder and a resin component as a material. CONSTITUTION:The molded articles are joined by a stage for sticking the respective joint surfaces of the plural molded articles subjected to an injection molding stage and degreasing and sintering the molded articles or a means for completing the sintering stage. An adhesive effect is obtd. between the joint surface of the molded articles by a means for applying an org. solvent or the org. solvent in which the metallic powder or ceramic powder is incorporated on the joint surfaces of the molded articles when the adhesion of the joint surfaces of the molded articles in the degreasing stage is necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method for joining a plurality of molded products which have been subjected to an injection molding process, using a compound composed of metal powder or ceramic powder and a resin component.

[0002]

2. Description of the Related Art A metal powder or ceramic powder injection molding method uses a compound composed of metal powder or ceramic powder and a resin component as a material, performs molding in an injection molding process, and removes a resin component in a degreasing process. This is a processing method in which the powder is sintered in the sintering step.

In the injection molding process, since a molded body is formed by filling a mold with material, it is impossible to mold a hollow shape, and such an unmoldable shape is After the sintering process was completed, it was processed by post-processing such as joining. The joining method is a so-called brazing method in which a brazing material made of a low melting point metal such as gold, silver or nickel is melted on the joining surface and the diffusion property is used for joining, or a welding method is a metal material. Was generally taken in. Further, in the case of Sellamix, there was no suitable joining method.

[0004]

However, in the conventional method, there is a problem that it cannot be used as a ceramic material, it is weak in strength, and a dedicated process is required for the work.

[0005]

In order to solve the above-mentioned problems, the present invention adheres the respective joint surfaces of a plurality of molded products which have undergone the injection molding process, and performs the degreasing and sintering processes or the sintering process. It was made possible to join the molded bodies by means of completing the process. In addition, when adhesion is required between the molded body joint surfaces in the degreasing process, the molded body joint surfaces are bonded by means of applying an organic solvent or an organic solvent containing metal powder or ceramic powder. I was able to achieve the effect.

[0006]

According to the joining method configured as described above, in the degreasing step, the resin melts between the joining surfaces of the molded bodies to be joined, so that the resin is joined. In the degreasing process, the resin component is not completely removed in order to maintain the shape retention property, so this effect is continued until the sintering process. In the sintering step, since the metal or ceramic atoms that are the material of each molded body diffuse and sinter between the joint surfaces, the same strength as the other parts can be obtained between the joint surfaces.

[0007]

EXAMPLES The present invention will be described below. In the examples, SUS316L powder was used for metal powder injection molding, and ZrO ₂ powder was used for ceramics injection molding. SUS
The powder characteristics of each of the 316L powder and the ZrO ₂ powder are shown in Table 1. In addition, the SUS316L powder was mixed with the resins shown in Table 2 and the ZrO ₂ powder was mixed with the resins shown in Table 3 to prepare respective compounds as injection molding materials. The mixing ratio of the resin and the powder is both 45:55 by volume.

[0008]

[Table 1]

[0009]

[Table 2]

[0010]

[Table 3]

The shape and dimensions of the molded body molded in the injection molding process are shown in FIG. As shown in FIG. 2, this molded body is placed in a setter with the side surfaces of the two molded bodies attached. At this time, an organic solvent was applied and attached to the side surface of the molded body and then placed on the setter, and an organic solvent was applied and placed on the setter without using an organic solvent or the like. As the organic solvent, a mixture of dioctyl phthalate (DOP) and ethanol in a ratio of 7: 3 was used.

After that, the work proceeds to the degreasing process. The degreasing process is at atmospheric pressure, and the relationship between temperature and time in the atmosphere is SUS31.
Both the 6 L powder compound and the ZrO ₂ powder compound are as shown in FIG. After the degreasing process was completed, one side of the degreased body was lifted up, and the number of degreased bodies that broke at the joint surface was investigated. The results are shown in Table 4. After degreasing, it is necessary to maintain shape so that the shape does not collapse, and if the joint surface does not break in this experiment, it can be said that the degreased state and the joined state on the joint surface are good. In the experiment, the method of applying an organic solvent and adhering it showed better results.

[0013]

[Table 4]

Next, in the test after the completion of the degreasing step, the one in which the joint surface was not broken and the one in which two degreased body side surfaces were newly attached and placed in the setter were sintered. The relationship between temperature and time in the sintering process is shown in FIG. 4 for SUS316L powder and in FIG. 5 for ZrO ₂ powder. After the completion of the sintering step, the strength of the joint surface of the sintered body was measured by the three-point bending method. Among them, those having a bending strength of 30 Kgf / mm ² or less were considered to be defective joints. The results are shown in Table 5. Table 6 shows the bending strength of non-defective products. The strength of the joined parts is slightly worse than the strength of the non-joined parts, but it has necessary and sufficient mechanical properties.

[0015]

[Table 5]

[0016]

[Table 6]

[0017]

According to the present invention, a plurality of compacts molded by the injection molding method using a compound composed of a metal powder or a ceramic powder and a resin component as a material,
By adhering the bonding surface and completing the degreasing and sintering process or the sintering process, there is an effect that the molded bodies can be bonded. In addition, when it is necessary to attach the respective molded body joint surfaces in the degreasing step, the adhesion can be achieved by applying an organic solvent or an organic solvent containing a metal powder or a ceramic powder to each molded body joint surface.

[Brief description of drawings]

FIG. 1 is a diagram showing a dimensional shape of a molded body molded by injection molding.

FIG. 2 is a diagram showing a shape of a molded body placed on a setter in a degreasing step.

FIG. 3 is a diagram showing degreasing conditions of temperature and time in a degreasing step.

FIG. 4 is a diagram showing sintering conditions of temperature and time in a sintering process of SUS316L powder.

FIG. 5 is a diagram showing sintering conditions of temperature and time in a ZrO ₂ powder sintering process.

Claims (3)

[Claims] 1. When joining a plurality of molded bodies molded by an injection molding method using a compound composed of metal powder or ceramic powder and a resin component as a material,
A method for joining a metal powder and a ceramic powder injection-molded article, which comprises joining the compacts by adhering the joining surfaces of the respective compacts and completing the sintering step. 2. When joining a plurality of molded bodies molded by an injection molding method using a compound composed of metal powder or ceramic powder and a resin component as a material,
A method for joining a metal powder and a ceramic powder injection-molded article, which comprises joining the shaped articles by adhering the joining surfaces of the respective shaped articles and completing the degreasing and sintering steps. 3. The joining method according to claim 1 or 2, wherein when it is necessary to attach the respective molded body bonding surfaces in the degreasing step, an organic solvent or an organic solvent containing a metal powder is attached to each molded body bonding surface. A method for joining a metal powder and a ceramic powder injection-molded article, characterized by applying at least one of an organic solvent containing a ceramic powder to bond them.