JPS61169817A - Composite blank for spectacle frame - Google Patents

Abstract

PURPOSE:To make possible brazing in the atm. and to increase brazing strength by using Ti or Ti alloy as a core material and Mo as an intermediate layer and cladding a corrosion resistant material on the outside thereof. CONSTITUTION:The Ti or Ti alloy is used as the core material 1 and the Mo is provided as the intermediate layer 7 on the outside thereof. A material having good corrosion resistance and excellent brazing characteristic, for example, either of Ni-Cr alloy or gold alloy is clad on the outside of the layer 7. Composite blank 3' for spectacle frames constituted in such a manner is compressed to manufacture a plate material 4'. The Mo of the layer 7 suppresses the diffusion of the Ti of the material 1 to prevent the formation of an intermetallic compd. when such plate material 4' is brazed in the atm. kept at 600-900 deg.C by using a brazing filler metal 5 such as gold solder or silver solder. There is therefore no exfoliation after brazing and the brazing having high brazing strength is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 such demands.

However, Ti or Ti alloys have poor brazing properties and must be brazed in a high vacuum or in a special atmosphere in order to have strong strength, and improvements in this respect have been desired. .

As one of the means, as shown in FIG.
An alloy is used as a core material, and a material 2 having good corrosion resistance and brazing properties is used on the outside, such as Ni-Cr alloy, gold alloy, etc.
A method of cladding with silver alloy or the like has been 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, the composite material 3 for eyeglass frames is rolled and made into a sheet material. 4 is made, and this plate material 4 is heated to 600 mm using a brazing material 5 such as Ag wax: Au wax as shown in Fig. 4.
When brazing in the air at ~900°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 layer of intermetallic compound 6 peels off after brazing. There was a drawback.

(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) The composite material for eyeglass frames of the present invention is as shown in FIG.
Ti or Ti alloy is used as the core material 1, Mo is provided as an intermediate layer 7 on the outside of this, and a material 2 having good corrosion resistance and excellent brazing properties, such as Ni-Cr alloy or gold, is provided on the outside of this intermediate layer 7. It is made of cladding of alloy, silver alloy, etc.

The composite material 3' for eyeglass frames having such a structure is pressed to form a plate material 4', and this 4' is made of Ag wax, A as shown in FIG.
Even if a brazing material 5 such as U brazing material 5 is used, if brazing is performed in the atmosphere at 600 to 900°C, the diffusion of Ti in the core material 1 will be reduced by the M in the intermediate layer 7.
o suppresses the formation of intermetallic compounds. Therefore, there is no peeling after brazing, and good brazing with high brazing strength can be obtained.

Incidentally, Mo may be physically 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 outer covering material to form a cladding.

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, Ti is used as a core material 1 with a diameter of 3III+, and MQ with a thickness of O and OL7+aa+ is clad as an intermediate layer 7 on the outside of this. 0
．． A composite material 3' for eyeglass frames clad with 2511III Ni-CrlO% alloy 2 is rolled to form a plate material 4' having a thickness of 0.7511I11, and this plate material 4'
As shown in FIG. 4, a test piece was obtained by brazing at 830 DEG C. in the atmosphere using a brazing filler metal 5 having <Ag-Cu2Q%.

(Example 2) As shown in Fig. 1 <Ti95 wt%, A13 t%, V2
wt% Ti alloy is used as a core material 1 with a diameter of 3 mm, the outside of these is clad with Mo with a thickness of 0.017 mm+ as an intermediate layer 7, and the outside of this intermediate layer 7 is clad with a 0.25 mm thick Ti alloy with a diameter of 3 mm. A composite material 3' for eyeglass frames consisting of a gold alloy 2 clad with a gold alloy 2 is rolled to form a plate material 4' with a thickness of 0.75+++ m, and this plate material 4' is made of a material (Ag-
A test piece was obtained by brazing at 830° C. in the atmosphere using a brazing material 5 containing 28% Cu.

(Conventional example) As shown in Fig. 1, a composite material 3 for eyeglass frames, which is made of Ti as a core material 1 with a diameter of 3 m + m, and a Ni-CrlO% alloy 2 with a thickness of 9.25 m on the outside thereof, is rolled. A plate material 4 having a thickness of 0.75++v+ was prepared, and this plate material 4 was brazed in the atmosphere at 830 DEG C. using a brazing material 5 having <Ag-Cu2O% as shown in FIG. 4 to obtain a test piece.

However, when the test pieces of Example 1.2 and the conventional example were subjected to a tensile test, the results shown in the table below were obtained.

*Number of test pieces: 5 As is clear from the table above, the test piece of Example 12 has significantly higher breaking strength and bonding strength than the conventional test piece. In addition, in the test piece of the conventional example, the cladding surface of the core material 1 and the outer material 2 was the fracture surface, 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 has the following features:
It is possible to braze in the atmosphere and has excellent brazing workability.Moreover, the strength of brazing is extremely high, and since the core material does not separate from the outer material, it has excellent durability, functionality, and is lightweight. It can be said to be an innovative composite material for eyeglass frames.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a composite material for eyeglass frames of the present invention, Fig. 2 is a sectional view of a test piece obtained by brazing a plate obtained by rolling the composite material, FIG. 3 is a sectional view of a conventional composite material for eyeglass frames, and FIG. 4 is a sectional view of a test piece obtained by brazing a plate material obtained by rolling the composite material. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A composite material for eyeglass frames, characterized in that the core material is Ti or Ti alloy, the intermediate layer is Mo, and the outside is clad with a corrosion-resistant material.