JPH0614152B2 - Composite material for eyeglass frames - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a composite material for an eyeglass frame, and more particularly to a composite material for an eyeglass frame having a strong clad composite strength and excellent brazing characteristics. .

(Prior art and its problems) Recently, lightweight lenses for both lenses and frames have been demanded from the viewpoints of widening the activity range of spectacle wearers and wearing comfort.

Recently, Ti or a Ti alloy has been used as a material for eyeglass frames that meets such demands.

However, Ti or Ti alloy has poor brazing property, and it is necessary to perform brazing in a high vacuum or in a special atmosphere in order to have strong strength, and improvement in this point has been desired. .

As one of the means, as shown in FIG. 3, Ti or Ti
A method is employed in which an alloy is used as a core material, and a material 2 having good corrosion resistance and excellent brazing property, such as a Ni—Cr alloy, a gold alloy, or a silver alloy, is clad on the outside of the core material.

However, according to this method, the core material 1 of Ti or Ti alloy is prevented from being oxidized or nitrided, and brazing can be easily performed in the atmosphere, but this composite material 3 for eyeglass frames is rolled into a plate material. 4 is prepared, and this plate material 4 is used as shown in FIG.
When brazing in the atmosphere at 00 ° C, a very brittle intermetallic compound 6 is generated at the interface between the core material 1 and the outer material 2, so it is fatal that the intermetallic compound 6 peels from the layer after brazing. There was a flaw.

(Object of the invention) The present invention has been made to solve such a drawback, and it is possible to braze in the atmosphere, and further, the brazing strength is extremely high, and the core material and the outer material are separated from each other. The purpose is to provide no composite material for eyeglass frames.

(Structure of the Invention) As shown in FIG. 1, the composite material for an eyeglass frame of the present invention has a core material 1 of Ti or a Ti alloy, and Mo is provided as an intermediate layer 7 on the outer side thereof. In addition, the material 2 having excellent corrosion resistance and excellent brazing property, that is, any one of a gold alloy, a silver alloy and the like is clad.

The composite material 3'for eyeglass frames having such a structure is pressed to form a plate material 4 ', and the plate material 4'is made of Ag brazing, A bonding as shown in FIG.
Even if a brazing filler metal 5 such as u brazing is used in brazing in the atmosphere at 600 to 900 ° C., Mo in the intermediate layer 7 suppresses diffusion of Ti in the core material 1 to prevent generation of an intermetallic compound. Therefore, good brazing with high brazing strength can be obtained without peeling after brazing. Incidentally, Mo may be physically vapor-deposited on the surface of Ti or a Ti alloy, or a Mo plate or tube may be inserted between the core material and the jacket material to be clad.

Next, specific examples and conventional examples will be described in order to clarify the effect of the composite material for eyeglass frames of the present invention.

As shown in FIG. 1, Ti is used as a core material 1 having a diameter of 3 mm, and Mo having a thickness of 0.017 mm is clad as an intermediate layer 7 on the outside of the core material 1. Ni-Cr 10 having a thickness of 0.25 mm is provided on the outside of the intermediate layer 7.
% Composite material 3'for eyeglass frames clad with alloy 2 is rolled to make a plate material 4'having a thickness of 0.75 mm. This plate material 4'is made of Ag-Cu 28% brazing material 5 as shown in FIG. A test piece was obtained by brazing in air at 830 ° C.

(Example 1) As shown in FIG. 1, 95 wt% Ti, 13 wt% A, V2 wt%
Made of a Ti alloy of 3 mm in diameter as the core material 1, 0.017 mm thick of Mo is clad as an intermediate layer 7 on the outside of the core material, and 18K gold alloy 2 of 0.25 mm thickness is clad on the outside of the intermediate layer 7. The composite material 3'for eyeglass frames is rolled to form a plate material 4'having a thickness of 0.75 mm.
As shown in the figure, using the brazing filler metal 5 of Ag-Cu 28%,
A test piece was obtained by brazing in the atmosphere at ℃.

(Conventional example) As shown in FIG. 1, a composite material 3 for eyeglass frames, which comprises Ti as a core material 1 having a diameter of 3 mm and a 0.25 m thick Ni-Cr 10% alloy 2 clad on the outside, is rolled. 0.75
A plate material 4 having a thickness of mm is prepared, and this plate material 4 is set to A as shown in FIG.
A brazing material 5 containing 28% of g-Cu was brazed in the atmosphere at 830 ° C. to obtain a test piece.

When the test pieces of Example 1 and the conventional example were subjected to a tensile test, the results shown in the table below were obtained.

As is clear from the above table, the test piece of Example 1 has significantly higher breaking strength and higher bonding strength than the conventional test piece. The test piece of the conventional example is the core material 1.
While the clad surface between the outer material 2 and the outer material 2 was a fracture surface, the test piece of the example had a fracture surface in the base material and the core material 1
It can be seen that the joint strength between the outer material 2 and the outer material 2 is high.

(Effects of the Invention) As described in detail above, the composite material for an eyeglass frame of the present invention is
It can be brazed in the air, has excellent brazing workability, has extremely high brazing strength, and since it does not separate from the outer material as the core material, it has excellent durability and functionality, and lightweight eyeglasses. It can be said that this is an epoch-making composite material for frames.

[Brief description of drawings]

FIG. 1 is a sectional view of a composite material for an eyeglass frame of the present invention, FIG. 2 is a sectional view of a test piece obtained by brazing a plate material obtained by rolling the composite material, and FIG. FIG. 4 is a sectional view of a composite material for a frame, and FIG. 4 is a sectional view of a test piece obtained by brazing a plate material obtained by rolling the composite material.

Claims (1)

[Claims] 1. A composite material for an eyeglass frame, comprising Ti or a Ti alloy as a core material, Mo as an intermediate layer, and a gold alloy or a silver alloy clad on the outside.