JPH0515170B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an improvement of a composite material for eyeglass frames, and more particularly to a composite material for eyeglass frames that has strong clad composite strength and excellent brazing properties. (Prior art and its problems) Recently, there has been a demand for eyeglasses with lightweight lenses and frames from the viewpoint of expanding the range of activities of eyeglass wearers and from the viewpoint of comfort. Recently, Ti or Ti alloys have been used as materials for eyeglass frames to meet these demands. However, Ti or Ti alloys have poor brazing properties, and in order to have high brazing strength, it is necessary to braze in a high vacuum or in a special atmosphere. Improvements in this point are desired. was. As one of the means, as shown in Fig. 3, Ti
Alternatively, a Ti alloy is used as the core material, and a material 2 with good corrosion resistance and brazing properties, such as Ni-
A method of cladding with Cr alloy, gold alloy, silver alloy, etc. is adopted. However, although this method has the advantage of preventing the oxidation or nitridation of the Ti or Ti alloy core material 1 and allowing easy brazing in the atmosphere, it is possible to roll the composite material 3 for eyeglass frames into the plate material 4. make,
When this plate material 4 is brazed at 600 to 900°C using a brazing material 5 such as Ag brazing or Au brazing as shown in FIG. Since compound 6 is produced, there is a fatal drawback that the layer of metal compound 6 peels off after brazing. (Purpose of the Invention) The present invention has been made to eliminate these drawbacks, and it is possible to braze in the atmosphere, has extremely high brazing strength, and is resistant to peeling between the core material and the outer material. The purpose of this invention is to provide a composite material for eyeglass frames that is not available before. (Structure of the Invention) As shown in FIG. 1, the composite material for eye steel frames of the present invention has a core material 1 of Ti or a Ti alloy whose outer peripheral surface is plated with Au, Ag or Ni. Mo is provided as an intermediate layer 7 on the outside of the intermediate layer 7, and on the outside of this intermediate layer 7, a material 2 having good corrosion resistance and excellent brazing properties is provided with Au plating, Ag plating, or Ni plating on the inner peripheral surface. , for example, a Ni-Cr alloy, a gold alloy, a silver alloy, etc., is clad. A plate material 4' is made by rolling the composite differential material 3' for eyeglass frames having such a structure, and this 4' is heated to 600 to 600 mm using a brazing material 5 such as Ag wax or Au wax as shown in Fig. 2.
When brazing is performed in the atmosphere at 900° C., Mo in the intermediate layer 7 suppresses the diffusion of Ti in the core material 1, thereby preventing the formation of intermetallic compounds. Therefore, there is no peeling after brazing,
Good brazing with high brazing strength can be obtained. In addition, this composite material 3' is clad with Au plating, Ag plating, or Ni plating applied to the outer circumferential surface of the core material and the inner circumferential surface of the outer covering material to prevent oxidation during cladding. , and will not peel off during subsequent processing. Incidentally, Mo may be clad by inserting a plate or a tube between the core material and the outer covering material. Next, specific examples and conventional examples will be described in order to clarify the effects of the composite material for eyeglass frames of the present invention. Example 1 As shown in Fig. 1, a Ti core material 1 with a diameter of 3 mm is made of Ti whose outer peripheral surface is plated with Au, and a thickness of 0.017 cm is placed on the outside of this core material 1.
mm of Mo is clad as the intermediate layer 7, and the inner peripheral surface of the intermediate layer 7 is plated with Au.
A composite material 3' for eyeglass frames clad with 0.25 mm of Ni-Cr10wt% alloy 2 was rolled.
A plate material 4' with a thickness of 0.75 mm is made, and this plate material 4' is coated with a brazing material 5 of Ag-Cu28wt% as shown in Fig. 4.
A test piece was obtained by brazing at 830°C in the atmosphere. Example 2 The outer peripheral surface was plated with Ni as shown in Figure 1.
A Ti alloy consisting of Ti95wt%, Al3wt%, and V2wt% is used as the core material 1 with a diameter of 3 mm, and a thickness is
A composite material 3' for eyeglass frames is made by cladding 0.017 mm of Mo as the intermediate layer 7, and cladding 0.25 mm thick 18K gold alloy 2 with Ni plating on the inner peripheral surface on the outside of this intermediate layer 7. A plate material 4' with a thickness of 0.75 mm was made by rolling, and this plate material 4' was rolled as shown in Fig. 4.
A test piece was obtained by brazing at 830° C. in the atmosphere using a brazing material 5 containing 28 wt% Ag-Cu. (Conventional example) As shown in Fig. 1, Ti is used as the core material 1 with a diameter of 3 mm,
On the outside of this, 0.25m thick Ni-Cr10wt% alloy 2
Composite material for eyeglass frames made of cladding 3
is rolled to make plate material 4 with a thickness of 0.75mm, and this plate material 4
As shown in Fig. 4, a test piece was obtained by brazing at 830°C in the atmosphere using a brazing filler metal 5 containing 28 wt% Ag-Cu. However, when the test pieces of Examples 1 and 2 and the conventional example were subjected to a tensile test, the results shown in the table below were obtained.

[Table] *Number of test pieces: 5 pieces As is clear from the table above, it can be seen that the test pieces of Examples 1 and 2 have significantly higher breaking strength and higher bonding strength than the conventional test pieces. In addition, in the test piece of the conventional example, the fracture surface was the clad surface of the core material 1 and the outer material 2, whereas in the test piece of the example, the base material was the fracture surface, and the core material 1 and the outer material 2 It can be seen that the bonding strength with (Effects of the Invention) As detailed above, the composite material for eyeglass frames of the present invention can be brazed in the air, has excellent brazing workability, has extremely high brazing strength, and has a Since the material will not peel off,
It has excellent durability and functionality, and can be said to be an epoch-making composite material for lightweight eyeglass frames.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a composite material for eyeglass frames of the present invention, Fig. 2 is a cross-sectional view of a test piece obtained by brazing a plate obtained by rolling the composite material, and Fig. 3 is a cross-sectional view of a conventional eyeglass frame material. Cross section of composite material for frame, 4th
The figure is a cross-sectional view of a test piece obtained by brazing a plate material obtained by rolling the composite material.

Claims (1)

[Claims] 1 The core material is Ti or Ti alloy with Au plating, Ag plating or Ni plating, and Mo is provided as an intermediate layer on the outside of this, and on the outside of this, on the inner peripheral surface.
A composite material for eyeglass frames characterized by being clad with a corrosion-resistant material coated with Au, Ag or Ni plating.