JPS6135426A - Composite blank material for spectacle frame - Google Patents

Abstract

PURPOSE:To provide a reduced weight, increased strength and improved brazing characteristic, plating characteristic and workability by using an alloy formed by dispersing either of Be powder or Be alloy powder at specific volumetric % into a Ti alloy, cladding a specific material if necessary as an intermediate material thereon and cladding further an alloy having corrosion resistance on the outside peripheral surface thereof. CONSTITUTION:Either of the Be powder or Be alloy powder is dispersed at 0.1- 40vol% into the Ti alloy to be used as the core material in order to improve the mechanical strength of the core material and to reduce the weight thereof. The alloy of Cu, Ni, Ag, Au, platinum group or stainless group having corrosion resistance is clad on the outside peripheral side of the core material to prevent the difficulty of brazing by the high-temp. activity of the Ti which is the essential component of the core material. The deterioration of the plating characteristic by the secure oxide film of the surface is prevented as well. The joint strength between the core material and the sheath metal is further improved if the material consisting of any of Ag, Cu, Ni or the alloy thereof is interposed as the intermediate layer therebetween.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to improvements in composite materials for eyeglass frames.

(Prior art and its problems) Recently, there has been a demand for eyeglasses with lightweight and high-strength lenses and frames in order to expand the range of activities of eyeglass wearers and to improve the comfort level of eyeglass wearers.

For this reason, the material 1 for eyeglass frames shown in FIG. 2a, which is made of Ti or its alloy and has a specific gravity of 4.51,
This is used as a core material, and in order to improve the plating properties on the outer circumferential side, Cu-based, Ni-based, and A
g-based, Au-based, platinum group-based.

Composite material 3 for eyeglass frames is clad with stainless steel alloy as covering material 2, and furthermore, in order to increase the bonding strength between core material 1 and covering material 2 of composite material 3 for eyeglass frames as shown in FIG. As shown in FIG. 2C, a composite material 5 for eyeglass frames in which materials such as Ag, Cu, Nj, and alloys thereof are bonded with an intermediate layer 4 interposed therein has been developed and put into practical use.

However, with the development of plastic lenses, there has been a demand for lighter and stronger materials for frames2), and the materials shown in Figure 2 a, b, and c above are no longer able to meet these demands. .

On the other hand, AI and A1 alloys have a specific gravity of 2.7 and TI's 315
However, it has a low melting point of about 650°C, and cannot be used for brazing, which has conventionally been applied to eyeglass frames.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and is lightweight and has high strength, and has excellent brazing and plating characteristics.

The purpose of this invention is to provide a composite material for eyeglass frames that has excellent workability.

(Structure of the Invention) One of the composite materials for eyeglass frames of the present invention includes 0.1 to 4% of either Be powder or Be-based alloy powder in a Ti alloy.
The core material is an alloy in which 0% by volume is dispersed, and the outer periphery thereof is clad with a corrosion-resistant Cu-based, Ni-based, Ag-based, Au-based, platinum group, or stainless steel-based alloy.

Another composite material for eyeglass frames of the present invention is a Ti alloy containing either Be powder or Be-based alloy powder at 0.1%.
~40% volume dispersed alloy is used as a core material, the outer circumference is clad with a material made of Ag, Cu, Ni, or any of these alloys as an intermediate layer, and the outer circumference is a Cu-based material that has corrosion resistance. It is clad with any one of Ni-based, Ag-based, Au-based, platinum group-based, and stainless steel-based alloys.

In the above composite material for eyeglass frames of the present invention, the reason why either Be powder or Be-based alloy powder is dispersed in an amount of 0.1 to 40% by volume in the Ti alloy serving as the core material is due to the mechanical strength of the core material. In order to improve the
This is because weight reduction can be achieved by controlling the amount of Be at about 1%, but if it is less than 0.1% by volume, it is not possible to improve the mechanical strength of the core material, and if it exceeds 40% by volume. This is because processing becomes difficult.

Furthermore, in the composite material for eyeglass frames of the present invention, the outer peripheral side of the core material is Cu-based and Ni-based, which have corrosion resistance.

The reason for cladding Ag-based, Au-based, platinum group-based, and stainless steel-based alloys is that Ti, the main component of the core material, is active at high temperatures. This is because it prevents the Ti from becoming difficult to attach, and since the surface of Ti is covered with a strong oxide film, poor plating properties can be improved, and it can be used as a material for eyeglass frames.

Furthermore, in another composite material for eyeglass frames of the present invention, Ag is present between the core material and the outer covering metal.

The reason why a material made of Cu, Ni, or an alloy thereof is interposed and bonded as an intermediate layer is to further improve the bonding strength between the core material and the outer sheath metal, and to obtain a more reliable composite material for eyeglass frames. This is because it is possible.

(Examples) Various examples of the composite material for eyeglass frames of the present invention will be described with reference to the drawings.

Composite material 6 for eyeglass frames shown in FIG. 1a (Example 1)
Ni-CrlO was applied to the outer circumferential side of a core material 7 with a diameter of 2.7 fins using a powder metallurgy method, in which 30% by volume of Be powder with a particle size of 1 to 5 μm was mixed into Ti powder with a particle size of 5 to 15 μm and uniformly dispersed.
It is clad with a thickness of 170 μm with a weight percent of coating material being 8.

Composite material 9 for eyeglass frames shown in Figure 1 (Example 2)
is Be powder with a particle size of 0.5 to 5 μm and a particle size of 5 to 15 μm.
Cu is mixed on the outer circumferential side of a core material 7 with a diameter of 2.9 mm, which is made by powder metallurgy and is uniformly dispersed by mixing 25% by volume in Ti powder.
- The intermediate layer 10 is made of a material consisting of 30% by weight of Ni5.
It is clad with a thickness of 5 .mu.m, and is further clad with a 20-karat gold alloy of 42 .mu.m as a covering material 8 on the outer circumferential side.

However, as shown in FIG. 2C, the composite material 6.9 for eyeglass frames of each Example 1.2 was combined with pure Ti (2 kinds of Ti) as the core material 1, and Ag-CulO was added in weight percent on the outer periphery thereof. Specific gravity, tensile strength, specific strength ( The tensile strength/specific gravity) was measured and the results shown in the table below were obtained.

(Left below) As is clear from the table above, the composite material for eyeglass frames of Example 1.2 has a lower specific gravity and higher tensile strength than the conventional composite material for eyeglass frames, and therefore has a lower specific strength. It turns out that it is significantly high.

(Effects of the Invention) As detailed above, the composite material for eyeglass frames of the present invention has the following features:
It has a low specific gravity and is lightweight, has a high tensile strength, has an extremely high specific strength, and has excellent brazing properties, plating properties, and processability, so it can be used as an alternative to conventional composite materials for eyeglass frames. The present invention has the advantage that a lightweight, high-strength eyeglass frame can be easily manufactured, and a eyeglass frame that is comfortable to wear and makes it easier for the eyeglass wearer to carry out activities can be obtained.

[Brief explanation of the drawing]

FIGS. 1a and 1b are cross-sectional views showing examples of the composite material for eyeglass frames of the present invention, and FIG. 2 albIC is a cross-sectional view of a conventional composite material for eyeglass frames.

Claims (1)

[Scope of Claims] 1) A Cu-based core material having an alloy in which 0.1 to 40% by volume of Be powder or Be-based alloy powder is dispersed in Ti or a Ti alloy, and having corrosion resistance on the outer periphery thereof. , Ni-based, A
A composite material for eyeglass frames made of a cladding material made of a G-based, Au-based, platinum-based, or stainless steel-based alloy. 2) The core material is an alloy in which 0.1 to 40% by volume of either Be powder or Be-based alloy powder is dispersed in Ti or Ti alloy, and the outer periphery is made of Ag, Cu, Ni, or any of their alloys. The material consisting of these materials is clad as an intermediate layer, and the outer periphery is further clad with a corrosion-resistant Cu-based, Ni-based, Ag-based, Au-based, platinum group, or stainless steel alloy as a covering material. Composite material for eyeglass frames.