JPS61109016A - Composite blank material for spectacle frame - Google Patents

Abstract

PURPOSE:To obtain a composite blank material which can be easily produced and has good strength and durability by using Ti or Ti alloy as a core material, cladding an alloy contg. a prescribed amount of Pd, Si, Ga and Ag as an intermediate material thereon and cladding a corrosion resistant material on the outside thereof. CONSTITUTION:This composite blank material is formed by using a the Ti or Ti alloy as the core material 1, cladding an Ag alloy contg. 2.5-50wt% Pd and 0.01-10wt% 1 or two kinds of Si and Ga as the intermediate layer 7 on the outside of the core material and cladding the material 2 having the good corrosion resistance and brazing characteristic, for example, any of Ni-Cr alloy, Ni-Cu alloy, Au alloy, Ag alloy and stainless steel to the outside thereof. The Ag alloy used for the layer 7 acts to relieve the thermal strain in the stage of brazing and the Pd acts to prevent the exfoliation after brazing. The Si and Ga has the effect to prevent the abnormal growth of the Pd-Ti layer and the consequent generation of exfoliation when the brazing temp. is increased too much.

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 (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 is adopted in which any one of Cu alloy, Au alloy, Ag alloy, stainless steel, etc. is crushed.

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 the air at ~900°C, very brittle intermetallic compounds 6 such as Ti Ni and Ti Au are formed at the interface between the core material 1 and the outer material 2. It had the fatal drawback of peeling off from the layer.

(Purpose of the Invention) The present invention has been made in order to eliminate such drawbacks, and provides an eyeglass frame that can be brazed in the atmosphere, has extremely high brazing strength, and does not separate from the upper and outer materials. 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 Pd is placed on the outside of this.
2.5 to 50% by weight and one or two of Si and Ga
An Ag alloy containing 0.01 to 10% by weight of seeds is clad as an intermediate layer, and a material 2 having good corrosion resistance and brazing properties, such as Ni-Cr alloy, Ni-
It is clad with Cu alloy, Au alloy, Ag alloy, stainless steel, etc.

The reason why an Ag alloy was used as the intermediate layer here is that Ag relieves thermal strain during brazing.

Furthermore, the addition of Pd causes preferential diffusion bonding between Ti or the outer cover material and Pd, and in particular, Pd-Ti is not brittle.
This is because peeling after brazing can be prevented. Pd 2.5-5
The reason why it is limited to 0% by weight is that if it is less than 2.5% by weight, Pd will not be able to preferentially combine and form a Pd-Ti layer.
This is because if it exceeds the weight percentage, the Ag layer as a thermal relaxation material will peel off due to considerable thermal strain.

Furthermore, the reason why one or two types of Si and Ga are added is to prevent abnormal growth of the P d -Ti layer and to prevent peeling if the brazing temperature is raised too much. This is because Ti and Si or Ga combine preferentially over Pd-Ti to form a very thin Ti-3i layer or Ti-Ga layer, which suppresses the growth of Pd-Ti. St.
The reason why the amount of one or two types of Ga 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, processing becomes difficult.

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. Ni-Crl with a thickness of 0.25 m is placed on the outside of this intermediate layer 7.
A composite material 3' for eyeglass frames clad with O wt % alloy 2 was rolled to produce a plate material 4' with a thickness of 0.75 m.
This plate material 4' is shown in Fig. 2 (Ag-Cu28% by weight).
A test piece was obtained by brazing at 830° C. in the atmosphere using brazing filler metal 5.

(Example 2) As shown in FIG. 1 < T i 95% by weight, A13% by weight
, 72% by weight is used as the core material 1 with a diameter of 3 cranes, and the outer side of this is clad with 5% by weight of Ag-Pd - 1.5% by weight of 3i as the intermediate layer 7. A composite material 3' for eyeglass frames clad with a 0.25w Ni-Cu 30% alloy 2 is rolled to form a plate material 4' with a thickness of 0.75, and this plate material 4' is rolled as shown in FIG. <83 using Ag-Cu28% by weight brazing filler metal 5
A test piece was obtained by brazing in the atmosphere at 0°C.

(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 3fi, and a Ni-CrlO weight% alloy 2 with a thickness of 0.25w clad on the outside of the core material 1. is rolled to make a plate material 4 with a thickness of 0.75 m, and this plate material 4 is rolled into a fourth plate material 4.
As shown in the figure, a test piece was obtained by brazing at 830° C. in the atmosphere using a brazing material 5 containing 28% by weight of 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 pieces of Examples 1 and 2 have significantly higher breaking strength and bonding strength than the conventional test pieces. 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:
It is possible to braze in the atmosphere and has excellent brazing workability, and the strength of brazing is extremely high (in addition, the core material and outer material do not separate, so it has excellent durability and functionality. It can be said to be an innovative composite material for lightweight 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 3 Figure 2 Figure 4

Claims (1)

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