JPS6225724A - Composite material for spectacle frame - Google Patents

Abstract

PURPOSE:To permit brazing in the atmosphere and to improve brazing strength by using Ti or Ti alloy as a core material and Pt, Ir, Os, Ru, Rh or Pd alone or the alloy thereof as an intermediate layer and cladding a corrosion resistant material to the outside thereof. CONSTITUTION:The Ti or Ti alloy is used as the core material 1 and the Pt, Ir, Os, Ru, Rh or Pd along or the alloy thereof is provided as the intermediate layer 7 thereon. A material 2 having the good corrosion resistance and excellent brazability, for example, any of Ni-Cr alloy, gold alloy of silver alloy is clad on the outside of the intermediate layer 7. Such stock is pressed to from a sheet material 4'. The material 4' is subjected to brazing in the atmosphere by using a brazing filler metal 5 consisting of Ag solder or Au solder, then the Pt, Ir, Os, Ru, Rh or Pd alone or the alloy thereof the intermediate layer 7 suppresses the diffuction of the Ti of the material 1 to prevent the formation of an intermetallic ompd. The exfoliation after brazing is thus obviated and the brazing is executed with the high brazing strength.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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 are difficult to braze and require brazing in a high vacuum or 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 with good corrosion resistance (and excellent brazing properties) such as Ni-Cr alloy, gold alloy,
A method of cladding with silver alloy or the like has been adopted.

However, although this method has the advantage of preventing 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 into a sheet material. 4, and this plate material 4 is heated to 600 mm using a brazing material 5 such as Ag wax or 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, and PtX is coated on the outside of this.
A single substance or an alloy of Ir, Os, RuXRh, Pd is provided as an intermediate layer 7, and a material 2 having good corrosion resistance and brazing properties, such as Ni-C, is provided on the outside of this intermediate layer 7.
It is clad with any one of r-alloy, gold alloy, silver alloy, etc.

A plate material 4' is made by pressing the composite material 3' for eyeglass frames constructed as described above, and this 4' is coated with Ag wax and 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 diffusion of Ti in the intermediate layer 7.
t, lr, 03% Ru, RhPd alone or in their alloy suppresses the generation of intermetallic compounds. Therefore,
There is no peeling after brazing, and good brazing with high brazing strength can be obtained.

Pt, Ir, Os, Ru, Rh, and Pd may be physically vapor deposited on the surface of Ti or Ti alloy, or a plate or tube of these elements or alloys may be placed between the core material and the outer covering material. May be inserted and clad.

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 3 mm, and 33% of PT-1R with a thickness of 0.017 nm is crafted as an intermediate layer 7 on the outside of this, and on the outside of this intermediate Ps 7. A composite material 3' for eyeglass frames clad with a Ni-Cr 10% gold alloy with a thickness of 0.25 mm was rolled to produce a plate material 4' with a thickness of 0.75 mm, and this plate material 4' was As shown in the figure, a test piece was obtained by brazing at 830° C. in the atmosphere using a brazing filler metal 5 containing 23% Ag and Cu.

(Example 2) As shown in FIG. 1, <Ti95wt%, AI! 3wt%, V
A core material 1 with a diameter of 3Il111 is made of a Ti alloy consisting of 2wt%.
Pt-Pd with a thickness of 0.017 mm is placed on the outside of these.
A composite material 3' for an eyeglass frame, which is clad with 18% of gold alloy 2 having a thickness of 0.25 mm on the outside of the middle layer N7, is rolled to form a 0.25 mm thick composite material 3'.
A plate material 4' with a thickness of 75 mm was made, and this plate material 4' was heated at 830°C using a brazing material 5 of 28% Ag-Cu as shown in Fig. 2.
A test piece was obtained by brazing in the atmosphere.

(Conventional Example) As shown in FIG. 3, a composite material 3 for eyeglass frames is made of a Ti core material 1 with a diameter of 3III11 and a Ni-CrlO% alloy 2 with a thickness of 0.25 m clad on the outside thereof. A plate material 4 with a thickness of 0.75 mm is made by rolling, and this plate material 4 is
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 containing 28% Ag-Cu.

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 1.2 has significantly higher breaking strength and bonding strength than the conventional test piece. In addition, in the test piece of the conventional example, the clad 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 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. FIG. 4 is a cross-sectional view of a composite material for a frame, and a cross-sectional view of a test piece obtained by brazing a plate obtained by rolling the composite material. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] With Ti or Ti alloy as the core material, pt, Ir, Os, Ru,
A composite material for eyeglass frames, characterized by having an intermediate layer made of Rh or Pd alone or an alloy, and cladding with a corrosion-resistant material on the outside.