【発明の詳細な説明】[Detailed description of the invention]
(産業上の利用分野)
本発明は、眼鏡フレーム用複合素材の改良に係
り、詳しくは材料のクラツド複合強度が強く且つ
ろう付特性に優れた眼鏡フレーム用複合素材に関
する。
(従来技術とその問題点)
近時、眼鏡着用者の活動範囲を広げる意味やか
け心地などの点からレンズ、フレーム共軽量の眼
鏡が要望されている。
このような要望に応えようとする眼鏡フレーム
用素材として、最近Ti又はTi合金が使用されて
いる。
しかしTi又はTi合金は、ろう付性が悪く、強
い強度を持たせる為には、高真空中或いは特殊な
雰囲気の下でろう付を行う必要があり、この点で
の改善が望まれていた。
その1つの手段として、第3図に示す如くTi
又はTi合金を芯材とし、これの外側に耐食性が
良く且つろう付性に優れた材料2、例えばNi−
Cr合金、金合金、銀合金などのいずれかをクラ
ドする方法が採られている。
しかしこの方法に依ると、Ti又はTi合金の芯
材1の酸化或いは窒化が防げ、大気中で簡単にろ
う付が行えるという長所があるものの、この眼鏡
フレーム用複合素材3を圧延して、板材4を作
り、この板材4を第4図に示す如くAgろうAuろ
う等のろう材5を用いて600〜900℃でろう付する
と、芯材1と外側の材料2との界面に非常に脆い
金属間化合物6が生成されるので、ろう付後この
金属間化合物6の層から剥離するという致命的な
欠点があつた。
(発明の目的)
本発明は斯かる欠点を解消すべくなされたもの
で、大気中でろう付が可能で、しかもろう付強度
が著しく高くその上芯材と外側の材料とが剥離す
ることのない眼鏡フレーム用複合素材を提供せん
とするものである。
(発明の構成)
本発明の眼鏡フレーム用複合素材は、第1図に
示す如くTi又はTi合金を芯材1とし、これの外
側にWが中間層7として設けられ、この中間層7
の外側に耐食性が良く且つろう付性に優れた材料
2、例えばNi−Cr合金、金合金、銀合金などの
いずれかがクラツドされて成るものである。
斯かる構成の眼鏡フレーム用複合素材3′を圧
して板材4′を作り、この4′を第2図に示す如く
Agろう、Auろう、等のろう材5を用いても600
〜900℃大気中でろう付すると、芯材1のTiの拡
散を中間層7のWが抑制して金属間化合物の生成
が防止される。従つて、ろう付後の剥離が無く、
ろう付強度の高い良好なろう付が得られる。
尚、WはTiあるいはTi合金の表面に蒸着して
もよいし、またWの板又は筒を芯材と外被材の間
に挿入してクラツドしてもよい。
次に本発明の眼鏡フレーム用複合素材の効果を
明瞭にする為に具体的な実施例と従来例について
説明する。
(実施例1)
第1図に示す如くTiを直径3mmの芯材1とし、
これの外側に厚さ0.017mmのWが中間層7として
クラツドされ、この中間層7の外側に厚さ0.25mm
のNi−Cr10wt%合金2がクラツドされて成る眼
鏡フレーム用複合素材3′を圧延して0.75mm厚の
板材4′を作り、この板材4′を第4図に示す如く
Ag−Cu28wt%のろう材5を用いて830℃大気中
でろう付してテストピースを得た。
(実施例2)
第1図に示す如くTi95wt%、Al3wt%、V2wt
%から成るTi合金を直径3mmの芯材1とし、こ
れらの外側に厚さ0.008mmのWが中間層7として
クラツドされ、この中間層7の外側に厚さ0.25mm
の18K金合金2がクラツドされて成る眼鏡フレー
ム用複合素材3′を、圧延して0.75mm厚の板材
4′を作り、この板材4′を第4図に示す如くAg
−Cu28wt%のろう材5を用いて830℃大気中でろ
う付してテストピースを得た。
(従来例)
第1図に示す如くTiを直径3mmの芯材1とし、
これの外側に厚さ0.25mのNi−Cr10wt%合金2
がクラツドされて成る眼鏡フレーム用複合素材3
を圧延して、0.75mm厚の板材4を作り、この板材
4を第4図に示す如くAg−Cu28wt%のろう材5
を用いて830℃大気中でろう付してテストピース
を得た。
然して実施例1,2及び従来例のテストピース
を引つ張り試験した処、下表に示すような結果を
得た。
(Industrial Application Field) 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 these 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. 3, Ti
Alternatively, a Ti alloy is used as the core material, and a material 2 with good corrosion resistance and brazing properties, such as Ni-
A method of cladding with Cr alloy, gold alloy, silver alloy, etc. is 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, and when this plate material 4 is brazed at 600 to 900℃ using a brazing material 5 such as Ag brazing or Au brazing as shown in Fig. 4, the interface between the core material 1 and the outer material 2 becomes extremely brittle. Since an intermetallic compound 6 is formed, there is a fatal drawback that the layer of the intermetallic compound 6 peels off after brazing. (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) As shown in FIG. 1, the composite material for eyeglass frames of the present invention has a core material 1 made of Ti or a Ti alloy, and W provided as an intermediate layer 7 on the outside of the core material 1.
A material 2 having good corrosion resistance and excellent brazing properties, such as Ni-Cr alloy, gold alloy, silver alloy, etc., is clad on the outside of the material. A plate material 4' is made by pressing the composite material 3' for eyeglass frames having such a structure, and this 4' is made as shown in FIG.
600 even when using brazing materials 5 such as Ag wax, Au wax, etc.
When brazing is performed in the air at a temperature of ~900°C, W in the intermediate layer 7 suppresses the diffusion of Ti in the core material 1, thereby preventing the formation of intermetallic compounds. Therefore, there is no peeling after brazing,
Good brazing with high brazing strength can be obtained. Note that W may be vapor-deposited on the surface of Ti or Ti alloy, or a plate or tube of W may be inserted between the core material and the outer covering material for 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 was used as the core material 1 with a diameter of 3 mm,
On the outside of this, W with a thickness of 0.017 mm is clad as the intermediate layer 7, and on the outside of this intermediate layer 7 with a thickness of 0.25 mm.
A composite material 3' for eyeglass frames clad with Ni-Cr10wt% alloy 2 is rolled to form a plate material 4' with a thickness of 0.75 mm, and this plate material 4' is made as shown in Fig. 4.
A test piece was obtained by brazing at 830° C. in the atmosphere using a brazing material 5 containing 28 wt% Ag-Cu. (Example 2) As shown in Figure 1, Ti95wt%, Al3wt%, V2wt
The core material 1 is made of Ti alloy consisting of
A composite material 3' for eyeglass frames, which is clad with 18K gold alloy 2, is rolled to form a plate material 4' with a thickness of 0.75 mm.
A test piece was obtained by brazing in the atmosphere at 830°C using the brazing filler metal 5 containing 28 wt% of -Cu. (Conventional example) As shown in Fig. 1, Ti is used as the core material 1 with a diameter of 3 mm,
On the outside of this, 0.25m thick Ni-Cr10wt% alloy 2
Composite material for eyeglass frames made of cladding 3
is rolled to make a plate material 4 with a thickness of 0.75 mm, and this plate material 4 is coated with a brazing filler metal 5 of Ag-Cu28wt% as shown in Fig. 4.
A test piece was obtained by brazing at 830℃ in the atmosphere. 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.
【表】
上表で明らかなように実施例1,2のテストピ
ースは従来のテストピースに比し、破断強度が著
しく高く、接合強度が高いことが判る。また従来
例のテストピースは芯材1と外側の材料2とのク
ラツドした面が破断面であつたのに対し実施例の
テストピースは母材が破断面で、芯材1と外側の
材料2との接合強度が高いことが判る。
(発明の効果)
以上詳記した通り本発明の眼鏡フレーム用複合
素材は、大気中でろう付が可能でろう付作業性に
優れ、しかもろう付け強度が著しく高く、その上
芯材と外側の材料とが剥離することが無いので、
耐久性、機能性に優れ、軽量眼鏡フレーム用複合
素材としては画期的なものと云える。[Table] As is clear from the above table, 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 fracture surface was the clad surface of the core material 1 and the outer material 2, 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 is high. (Effects of the Invention) As detailed above, the composite material for eyeglass frames of the present invention can be brazed in the air, has excellent brazing workability, has extremely high brazing strength, and has a Since the material will not peel off,
It has excellent durability and functionality, and can be said to be an epoch-making composite material for lightweight eyeglass frames.
【図面の簡単な説明】[Brief explanation of drawings]
第1図は本発明の眼鏡フレーム用複合素材の断
面図、第2図はその複合素材を圧延して得た板材
をろう付して得たテストピースの断面図、第3図
は従来の眼鏡フレーム用複合素材の断面図、第4
図はその複合素材を圧延して得た板材をろう付し
て得たテストピースの断面図である。
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. Cross section of composite material for frame, 4th
The figure is a cross-sectional view of a test piece obtained by brazing a plate material obtained by rolling the composite material.