JPS61109021A - Composite blank material for spectacle frame - Google Patents

Abstract

PURPOSE:To provide a composite blank material which permits brazing in the atm., has high brazing strength and prevents the exfoliation of a sheath material by using Ti or Ti alloy as a core material, cladding an intermediate layer consisting of a specific alloy to the outside thereof and cladding further the corrosion-resistant sheath material to the outside thereof. CONSTITUTION:The Ti or Ti alloy is used as the core material 1 and the Cu alloy contg. 2.5-50wt% Ni and 0.01-10wt% Sn and/or Al is clad as the intermediate layer 7 to the outside thereof. The sheath material 2 having good corrosion resistance and brazing characteristic, for example, any of an Ni-Cr alloy, Ni-Cu alloy or Au alloy is further clad to the outside thereof. The Ti and Cu alloy diffuse to each other to form Ti-Cu-Ni eutectic in the stage of hot extrusion or annealing and can add strength to joining when such Cu alloy is used for the intermediate layer 7. The abnormal growth of the Cu-Ti layer and the consequent exfoliation are prevented by the Sn or Al component when the brazing temp. is increased too much. The composite blank material for lightweight spectacle frames having good brazing workability and excellent durability and functionality is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Description of the field to which the invention pertains) The present invention relates to an improvement of a composite material for eyeglass frames, and more specifically, a composite material for eyeglass frames that has strong cladding strength and excellent brazing properties. Regarding.

In recent years, there has been a demand for eyeglasses with lightweight lenses and frames, both to expand the range of activities of eyeglass wearers and to make them more comfortable to wear.

Recently, Ti or Ti alloys have been used as materials for eyeglass frames to meet such demands.

(Prior art and its problems) However, Ti or Ti alloys have poor brazing properties, and in order to have strong strength, it is necessary to braze in a high vacuum or in a special atmosphere. Improvement was desired.

As one means for this purpose, as shown in FIG.
A method of cladding with U alloy, Au alloy, Ag alloy, stainless steel, etc. is 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 plate material 4. This plate material 4 is heated at 600°C using a brazing material 5 such as Ag wax or Au wax as shown in Fig. 4.
When brazing in air at ~900°C, extremely brittle metal open compounds 6 such as Ti-Ni and Ti-Au are generated at the interface between the core material 1 and the outer material 2. It had a fatal drawback of peeling off from the layer of compound 6.

(Objective of the Invention) The present invention has been made to eliminate such drawbacks, and provides an eyeglass frame that can be brazed in the atmosphere, has extremely high brazing strength, and does not peel off from the material used in the above example. The aim is to provide composite materials for use in

(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 Ni is placed on the outside of this.
2.5 to 50% by weight and one or both of Sn and Al 0
．． A Cu alloy containing 01 to 10% by weight is clad as an intermediate layer, and a material 2 having good corrosion resistance and excellent brazing properties, such as Ni-Cr alloy, N1-C, is coated on the outside of this intermediate layer.
It is clad with any one of U alloy, Au alloy, Ag alloy, stainless steel, etc.

The reason for using the Cu-Ni alloy as the intermediate layer here is that Ti and the Cu-Ni alloy undergo interdiffusion during hot extrusion and strain relief annealing to form a Ti-Cu-Ni eutectic structure.
This is because it strengthens the bond. The reason why Ni is limited to 2.5 to 50% by weight is that if it is less than 2.5% by weight, Cu will bond preferentially and only a Cu-Ti layer will be formed, and if it exceeds 50% by weight, only a Ni-Ti layer will be formed. and these are Ti-Cu-
This is because it is more brittle than Ni eutectic, so it tends to peel off.

Furthermore, the reason why one or two types of Sn and Al are added is to prevent abnormal growth of the Cu--Ti layer and to prevent peeling if the brazing temperature is raised too much. This is T
i and Sn or Al combine preferentially over Cu-Ti,
This is because a solid solution of Sn-Ti or Al-Ti is formed, and these alloys are not brittle even when grown. Sn,A
The reason why the amount of one or both types of l is set to 0.01 to 10% by weight is because if it is less than 0.01% by weight, there is no effect, and if it exceeds 10% by weight, it becomes difficult to process.

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.
Composite material 3' for eyeglass frames, in which 2% by weight of 3 Tsuru is clad as an intermediate layer 7, and the outside of this intermediate layer 7 is clad with Ni-CrlO alloy 2 having a thickness of 0.25 m.
is rolled to make a 75m thick plate material 4', and this plate material 4
' is shown in Figure 2.
A test piece was obtained by brazing at 830°C in the atmosphere.

(Example 2) As shown in FIG. 1 < T i 95% by weight, A13% by weight
, ■ A Ti alloy consisting of 2% by weight is used as the core material 1 with a diameter of 3fl, and Cu-Ni 30% by weight-A13 is placed on the outside of this.
% by weight is clamped as an intermediate layer 7, and on the outside of this intermediate layer 7 a 30% by weight Ni-Cu alloy 2 with a thickness of 0.25+m is applied.
A composite material 3' for eyeglass frames, which is made of a composite material 3' for use in eyeglass frames, is rolled to form a plate material 4' having a thickness of 0.75.
A test piece was obtained by brazing at 830°C in the atmosphere.

(Conventional example) As shown in Fig. 3, a composite for eyeglass frames is made of a Ti core material 1 with a diameter of 3 cranes, and a 0.25 inch thick Ni-Cr 10% by weight alloy 2 clad on the outside. Roll the material 3 to make a plate material 4 with a thickness of 0.75m, 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 containing 28% by weight of 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.

Number of pieces tested: 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 joint surface between the core material 1 and the outer material 2 was a fracture surface, whereas in the test piece of the example, the base material was a fracture surface, and the joint surface between the core material 1 and the outer material 2 was a fracture surface. It can be seen that the bonding strength is high.

(Effects of the Invention) As detailed above, the composite material for eyeglass frames of the present invention has the following features:
Brazing can be performed in the atmosphere and has excellent brazing workability.Moreover, the strength of brazing is extremely high.Furthermore, the core material and outer material do not separate, so 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]

Figure 1 is a sectional view of a conventional composite material for eyeglass frames, Figure 2 is a cross-sectional view of a conventional composite material for eyeglass frames.
The figure is a cross-sectional view of a test piece obtained by brazing the plate material obtained by rolling the composite material, Figure 3 is a cross-sectional view of the composite material for eyeglass frames of the present invention, and Figure 4 is a cross-sectional view of the composite material obtained by rolling the composite material. FIG. 3 is a cross-sectional view of a test piece obtained by brazing the plate material obtained in the above manner. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment (voluntary) 1985 Half Month 3rd special "Wag t-X * r!1
Eaves 1, incident display

Claims (1)

[Claims] Ti or Ti alloy is used as a core material, Cu alloy containing 2.5 to 50% by weight of Ni and 0.01 to 10% by weight of one or both of Sn and Al is clad as an intermediate material, and a corrosion-resistant material is clad on the outside. A composite material for eyeglass frames characterized by: