JP4380894B2 - Glass strengthening alloy - Google Patents
Glass strengthening alloy Download PDFInfo
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- JP4380894B2 JP4380894B2 JP2000211514A JP2000211514A JP4380894B2 JP 4380894 B2 JP4380894 B2 JP 4380894B2 JP 2000211514 A JP2000211514 A JP 2000211514A JP 2000211514 A JP2000211514 A JP 2000211514A JP 4380894 B2 JP4380894 B2 JP 4380894B2
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Description
【0001】
【発明の属する技術分野】
本発明はガラス強化用合金に係り、特に被強化材であるガラスとの密着強度が高く、耐衝撃強度が高い強化ガラスを実現することが可能なガラス強化用合金に関する。
【0002】
【従来の技術】
従来から、特に高い耐衝撃強度が要求される特殊自動車などの車両用窓ガラス,計装機器用覗き窓用ガラス,建築物用窓ガラス,電子機器用ガラス材として、ソーダライムガラスなどのガラス本体内に50%Ni−Fe合金などのFe−Ni系合金から成る線状の強化ワイヤを一体に埋設(封着)した強化ガラスが広く利用されている。上記強化ワイヤを構成する具体的な合金材としては、例えば18%Cr−8%Ni−Fe合金,18%Cr−8%Ni−3%Mo−Fe合金,18%Cr−8%Ni−2.5%Mo−2.5%Cu−Fe合金などが使用されている。上記合金材から成る強化ワイヤをガラス材に封着し複合化し強化ガラスを調製する場合には、上記合金材はガラスの熱膨張特性に合せて、その熱膨張特性を容易に設計できる利点がある。すなわち、合金材の熱膨張係数が、ソーダライムガラスなどの軟質ガラスの熱膨張係数に近似させることが容易になり、使用環境での温度変化によって両者の熱膨張係数の差が増大してガラスクラック等を発生するおそれが少ない。
【0003】
【発明が解決しようとする課題】
しかしながら、上記従来の合金材から成る強化ワイヤをガラス本体と複合化させて強化ガラスとした場合においては、ガラス材と強化ワイヤとの密着強度が未だ低い状態であるため、強化ガラスの耐衝撃性が不十分であり、また強度特性も経時的に低下する難点があり、いずれにしても従来の合金材は強化ガラス用の強化材としては不十分であるという問題点があった。
【0004】
また、従来の合金材から成る強化ワイヤを軟質ガラスに封着して複合化する際に、ガラス材と強化ワイヤとの間に気泡が発生し易い問題点もあった。なお、この発泡現象が生じても、その強化ガラスが一般建築物の窓ガラス用の強化ガラスとして使用される場合には、その発泡粒の大きさが微細なものである限り、大きな影響を及ぼすものではない。しかしながら、強化ガラスが電子機器や分析機器の構成部品として使用される場合には、僅かな発泡が存在しても特性に大きな悪影響を及ぼすことになるため、可及的に発泡が少ない強化ガラスを実現することが技術上の課題となっていた。
【0005】
本発明は上記問題点を解決するためになされたものであり、特に被強化材であるガラスとの密着強度が高く、また耐衝撃強度が高く経時劣化が少ない強化ガラスを実現できるガラス強化用合金を提供することを目的とする。
【0006】
【課題を解決するための手段】
本発明者は、上記目的を達成するために種々の組成および表面構造を有するガラス強化用合金を調製し、さらにその合金から補強ワイヤを形成して実際にガラス材と封着して強化ガラスを調製し、その熱膨張特性,密着強度,ガラス封着後の残留応力および耐衝撃性を比較検討し、以下のような知見を得た。すなわち、所定量のニッケル(Ni),コバルト(Co),クロム(Cr)を含有するFe基合金で補強ワイヤを形成したときに、補強ワイヤの熱膨張率をガラス材のそれと近似することが可能になり、ガラスとの密着強度が高く、耐衝撃性に優れた強化ガラスが初めて得られるという知見を得た。
【0007】
また、合金表面に所定厚さの酸化物から成る被膜(酸化膜)を形成したときには、合金のガラスに対する密着強度を、さらに高めることができるという知見も得られた。さらに、所定量のMn,Al,Si,Mo,Nb,Zr等を添加することにより、上記酸化膜の合金地金との付着強度をさらに高めることが可能になり、または酸化膜のむらを効果的に低減できる効果も得られるという知見を得た。
【0008】
本発明は上記知見に基づいて完成されたものである。すなわち、本発明に係るガラス強化用合金は、重量%でNiを30〜35%とCoを17〜25%とCrを1〜7%とを含有し残部Feから成る合金であって、30〜590℃の温度範囲における熱膨張係数が100×10−7〜110×10−7/℃であることを特徴とする。
【0009】
また合金が、さらにMnを1重量%以下の範囲、より好ましくは0.1〜1重量%の範囲で含有することが好ましい。また、合金が、さらにAlを1.5重量%以下の範囲、より好ましくは0.05〜1.5重量%の範囲で含有することが好ましい。また、合金が、さらにSiを4.0重量%以下の範囲で含有することが好ましい。また、合金が、さらにMo,NbおよびZrから選択された少なくとも1種の元素を1.5重量%以下の範囲、より好ましくは0.01〜1.5重量%の範囲で含有することが好ましい。
【0010】
さらに、合金表面に酸化物から成る被膜(酸化膜)を形成して構成することもできる。また、合金は線状またはメッシュ状に形成されることが好ましい。
【0011】
本発明に係るガラス強化用合金において、Niは熱膨張特性を決定する主要成分であり、30〜35重量%の範囲で含有される。Ni含有量が30重量%未満と過少な場合には、合金の熱膨張係数が小さくなる一方、含有量が35重量%を超えるように過大になると合金の熱膨張係数が大きくなり、いずれにしてもガラス材と複合化した場合に熱膨張差が大きくなり、ガラスクラックなどが発生し易い。また、合金表面に酸化膜を形成した場合において、酸化膜中にNiを拡散させることにより付着強度が改善される。
【0012】
またCoはNiと同様に合金の熱膨張特性を決定する主要成分であり、17〜25重量%の範囲で含有される。Co含有量が17重量%未満と過少な場合には、合金の熱膨張係数が小さくなる一方、含有量が25重量%を超えるように過大になると合金の熱膨張係数が大きくなり、いずれにしてもガラス材と複合化した場合に熱膨張差が大きくなり、ガラスクラックなどが発生し易い。
【0013】
さらにCrは、合金の耐食性を改善し、ガラスとの封着強度(密着強度)を向上させるとともに、合金の熱膨張曲線の屈曲点の位置に影響を与える成分であり、本発明合金では、1〜7重量%の範囲で含有される。Cr含有量が1重量%未満と過少な場合には、上記封着強度が不足し易くなる一方、Cr含有量が7重量%を超えるように過大になると、合金の熱膨張曲線の屈曲点が低温側に大きくずれることになり、ガラスと複合化した場合に熱膨張差に起因するガラスクラックが発生し易くなる。
【0014】
上記組成範囲を有する合金は、30℃から590℃の温度範囲における平均熱膨張係数が100×10−7〜110×10−7/℃となり、軟質ガラスの平均熱膨張係数に近似させることができ、使用温度から強化ガラスの製造工程温度までの範囲で熱膨張差に起因するガラスクラックの発生が少ない強化ガラスが得られる。なお、上記30℃は本合金の使用温度範囲内の温度であり、590℃は本合金の加工時に受ける最高温度の上限である。
【0015】
また、合金表面に酸化物から成る厚さ0.5〜10μm程度の被膜(酸化膜)を形成することにより、合金とガラスとの付着強度をより増加させることができる。上記酸化膜の形成方法としては、例えば合金を所定の線状またはメッシュ状に成形した後に、温度900〜1200℃,水素露点0〜40℃の湿潤水素炉中で5〜90分間加熱処理した後、大気中にて700〜1200℃で1〜60分間加熱処理することにより、表面に酸化膜を生成させる方法などが採用できる。
【0016】
またMnは、Niと同様に合金の熱膨張係数を増大させて調整する機能を有するとともに、合金の熱間加工性を向上させる成分でもあり、さらに高価なNiの代替成分として使用することも可能であり、本発明ではより好ましい添加成分として1重量%以下の範囲、より好ましくは0.1〜1重量%の範囲で含有される。また、Mnが多くなると酸化膜が剥離し易くなる。このため、添加量は1.0%以下が好適である。
【0017】
さらにAlは合金表面に形成した酸化膜と地金との付着強度を高くし、ガラスとの封着性が向上するが、添加量は多くなるにつれて熱膨張係数が大きくなる傾向があるため、その添加量は1.5%以下、より好ましくは0.05〜1.5%の範囲が望ましい。
【0018】
Siは、合金の加工性を改善するが、過剰量になると、合金の加工性に悪影響を与えるので、添加量は4.0%以下が適量である。
【0019】
Mo,NbおよびZrは、いずれも合金の強度を向上させる効果があるが、1.5%を超える過量になると合金の熱膨張係数が大きくなり、ガラスとの付着強度が低下して封着性が劣化するため、その含有量は1.5%以下であり、さらに0.01〜1.5%の範囲がより好ましい。
【0020】
上記組成のガラス強化用合金を、さらに線状またはメッシュ状に加工することにより、ガラスとの接触面積が増加し、より強化機能が向上したガラス強化用の補強ワイヤまたは補強材とすることができる。
【0021】
上記構成に係るガラス強化用合金によれば、所定量のNi,Co,Crを含有するFe基合金であり、その平均熱膨張率が100×10−7〜110×10−7/℃とガラス材の熱膨張率と近似するため、ガラスとの密着強度が高く、耐衝撃性に優れた強化ガラスを得ることができる。また、合金表面に酸化物から成る被膜を形成することにより、ガラス材との付着強度を、より高めることが可能になる。
【0022】
【発明の実施の形態】
次に本発明の実施形態について、以下の実施例および比較例を参照して具体的に説明する。
【0023】
Ni,Co,Cr,Mn,Al,Si,その他の元素配合量が表1に示す値となるように、金属原料等を配合し、真空誘導溶解炉で溶解せしめた後に鋳造して、それぞれ合金インゴットを調製した。得られた各合金インゴットを熱間鍛造加工および熱間圧延を施し、さらに中間焼鈍後に冷間圧延を施すことにより板厚0.5mmの圧延材をそれぞれ作成した。
【0024】
そして作成した各圧延材から熱膨張係数測定用試料片およびガラス封着試験用試料片を作成した。上記熱膨張係数測定用試料片を用いて、合金の熱膨張係数を測定する一方、各ガラス封着試験用試料片について、以下の条件で酸化膜を形成した。すなわち、試料片を湿潤水素炉中で1150℃で5分〜90分間酸化処理を行い、さらに大気中にて800℃で5〜60分間熱処理を行い、所定厚さの酸化物被膜(酸化膜)を形成した。
【0025】
また各ガラス強化用合金のガラスの付着性の良否を評価するために以下のような封着試験および衝撃破壊試験を実施した。すなわち、前記のように調製した100個の各試料片を水平枠内に配置した状態で、溶融したソーダライム系ガラスを流し込み凝固させて強化ガラスサンプルをそれぞれ調製した。
【0026】
そして、上記封着試験後において、強化ガラスサンプル総数に対してガラスクラックが発生したサンプル数を計測して封着試験での割れ発生率とした。また、封着時に試料片とガラスとの接触部に僅かでも気泡が発生したサンプル数を計測して、気泡発生試料割合とした。
【0027】
また、封着部のガラスを破砕したときに酸化膜が剥がれ金属地金が露出した個数を計測して密着度を測定した。各測定結果を下記表1に示す。
【0028】
【表1】
【0029】
上記表1に示す結果から明らかなように、所定量のNi,Co,Cr等を含有し、熱膨張係数を所定の範囲に調整した各実施例に係るガラス強化用合金によれば、ガラスとの封着試験を実施した場合においても、ガラス材との熱膨張差が少ないため、ガラスクラック(割れ)の発生率が少なく、耐久性に優れていることが判明した。また、ガラス材に封着した状態から衝撃破壊試験を実施した場合でも、金属地金が露出した個数が少なく、優れた密着強度および耐衝撃性を有することが確認できた。また、封着試験を行っても、気泡の発生割合が極めて少ないことから、特に電子機器用の強化ガラスを形成するための補強材として極めて有効であることが判明した。
【0030】
一方、本発明で規定する各成分の組成範囲外の合金から成る各比較例においては、ガラスとの熱膨張差が大きくなったり、ガラスクラックや気泡などの不良発生率が大きくなることが再確認できた。特に比較例1の従来合金においては、平均熱膨張係数はガラス材と同等ではあるが、ガラスとの密着度(接合強度)が低く、十分な補強効果が得られないことも判明した。
【0031】
【発明の効果】
以上説明の通り、本発明に係るガラス強化用合金によれば、所定量のNi,Co,Crを含有するFe基合金であり、その平均熱膨張率が100×10−7〜110×10−7/℃とガラス材の熱膨張率と近似するため、ガラスとの密着強度が高く、耐衝撃性に優れた強化ガラスを得ることができる。また、合金表面に酸化物から成る被膜を形成することにより、ガラス材との付着強度を、より高めることが可能になる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a glass-strengthening alloy, and more particularly to a glass-strengthening alloy capable of realizing a tempered glass having a high adhesion strength with a glass to be reinforced and a high impact strength.
[0002]
[Prior art]
Conventionally, glass bodies such as soda lime glass as window glass for vehicles for special automobiles that require particularly high impact strength, glass for viewing windows for instrumentation, window glass for buildings, and glass for electronic devices A tempered glass in which a linear reinforcing wire made of an Fe—Ni alloy such as a 50% Ni—Fe alloy is embedded (sealed) is widely used. Specific alloy materials constituting the reinforcing wire include, for example, 18% Cr-8% Ni-Fe alloy, 18% Cr-8% Ni-3% Mo-Fe alloy, 18% Cr-8% Ni-2. .5% Mo-2.5% Cu-Fe alloy or the like is used. In the case of preparing a tempered glass by sealing a reinforced wire made of the above alloy material to a glass material to prepare a tempered glass, the above alloy material has an advantage that the thermal expansion characteristic can be easily designed according to the thermal expansion characteristic of the glass. . In other words, it becomes easy to approximate the thermal expansion coefficient of the alloy material to that of soft glass such as soda lime glass, and the difference in the thermal expansion coefficient between the two due to temperature changes in the usage environment increases the glass crack. Is less likely to occur.
[0003]
[Problems to be solved by the invention]
However, when the tempered wire made of the above-mentioned conventional alloy material is combined with the glass body to make tempered glass, the adhesion strength between the glass material and the tempered wire is still low, so the impact resistance of the tempered glass However, there is a problem that the strength characteristics are also deteriorated with time, and in any case, the conventional alloy material is insufficient as a reinforcing material for tempered glass.
[0004]
In addition, when a reinforced wire made of a conventional alloy material is sealed and composited with soft glass, there is also a problem that bubbles are likely to be generated between the glass material and the reinforced wire. Even if this foaming phenomenon occurs, when the tempered glass is used as tempered glass for window glass of a general building, as long as the size of the foamed particles is fine, it has a great effect. It is not a thing. However, when tempered glass is used as a component of electronic equipment and analytical instruments, even if slight foaming is present, the properties will be adversely affected. Realization has been a technical challenge.
[0005]
The present invention has been made to solve the above-mentioned problems, and in particular, a glass-strengthening alloy capable of realizing a tempered glass having high adhesion strength with glass as a to-be-reinforced material, high impact resistance strength and little deterioration with time. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present inventor prepared glass strengthening alloys having various compositions and surface structures, further formed reinforcing wires from the alloys, and actually sealed the glass with a tempered glass. The thermal expansion characteristics, adhesion strength, residual stress after glass sealing and impact resistance were compared and examined, and the following findings were obtained. That is, when a reinforcing wire is formed of an Fe-based alloy containing a predetermined amount of nickel (Ni), cobalt (Co), and chromium (Cr), the thermal expansion coefficient of the reinforcing wire can be approximated to that of a glass material. As a result, it was found that a tempered glass having high adhesion strength with glass and excellent impact resistance can be obtained for the first time.
[0007]
It was also found that the adhesion strength of the alloy to glass can be further increased when a film (oxide film) made of an oxide having a predetermined thickness is formed on the alloy surface. Furthermore, by adding a predetermined amount of Mn, Al, Si, Mo, Nb, Zr, etc., it becomes possible to further increase the adhesion strength of the oxide film with the alloy metal, or to effectively prevent the unevenness of the oxide film. It was found that an effect that can be reduced is obtained.
[0008]
The present invention has been completed based on the above findings. That is, glass reinforced alloy according to the present invention, an alloy consisting et al or the remaining portion Fe and containing a 1-7% of 17 to 25% and Cr 30 to 35% and Co to Ni in weight percent, The thermal expansion coefficient in a temperature range of 30 to 590 ° C. is 100 × 10 −7 to 110 × 10 −7 / ° C.
[0009]
Further, it is preferable that the alloy further contains Mn in a range of 1% by weight or less, more preferably in a range of 0.1 to 1% by weight. Further, the alloy preferably further contains Al in the range of 1.5% by weight or less, more preferably in the range of 0.05 to 1.5% by weight. The alloy preferably further contains Si in a range of 4.0% by weight or less. Further, the alloy preferably further contains at least one element selected from Mo, Nb and Zr in the range of 1.5% by weight or less, more preferably in the range of 0.01 to 1.5% by weight. .
[0010]
Furthermore, a film (oxide film) made of oxide can be formed on the alloy surface. The alloy is preferably formed in a linear or mesh shape.
[0011]
In the glass-strengthening alloy according to the present invention, Ni is a main component that determines the thermal expansion characteristics, and is contained in the range of 30 to 35% by weight. When the Ni content is too low, less than 30% by weight, the thermal expansion coefficient of the alloy is reduced. On the other hand, when the content is excessively higher than 35% by weight, the thermal expansion coefficient of the alloy is increased. However, when combined with a glass material, the difference in thermal expansion becomes large, and glass cracks and the like are likely to occur. In addition, when an oxide film is formed on the alloy surface, the adhesion strength is improved by diffusing Ni in the oxide film.
[0012]
Co, like Ni, is a main component that determines the thermal expansion characteristics of the alloy, and is contained in the range of 17 to 25% by weight. If the Co content is too small, such as less than 17% by weight, the thermal expansion coefficient of the alloy will be small. On the other hand, if the Co content is too large so that it exceeds 25% by weight, the thermal expansion coefficient of the alloy will increase. However, when combined with a glass material, the difference in thermal expansion becomes large, and glass cracks and the like are likely to occur.
[0013]
Furthermore, Cr is a component that improves the corrosion resistance of the alloy, improves the sealing strength (adhesion strength) with the glass, and affects the position of the bending point of the thermal expansion curve of the alloy. It is contained in a range of ˜7% by weight. If the Cr content is too low, less than 1% by weight, the sealing strength tends to be insufficient. On the other hand, if the Cr content is too high to exceed 7% by weight, the inflection point of the thermal expansion curve of the alloy will increase. It will shift | deviate greatly to a low temperature side, and when it combines with glass, it will become easy to generate | occur | produce the glass crack resulting from a thermal expansion difference.
[0014]
The alloy having the above composition range has an average coefficient of thermal expansion of 100 × 10 −7 to 110 × 10 −7 / ° C. in the temperature range of 30 ° C. to 590 ° C., and can be approximated to the average thermal expansion coefficient of soft glass. In the range from the use temperature to the temperature of the tempered glass manufacturing process, it is possible to obtain a tempered glass with few occurrences of glass cracks due to a difference in thermal expansion. The above 30 ° C. is the temperature within the operating temperature range of the alloy, and 590 ° C. is the upper limit of the maximum temperature that is experienced during the processing of the alloy.
[0015]
Moreover, the adhesion strength between the alloy and the glass can be further increased by forming a film (oxide film) having a thickness of about 0.5 to 10 μm made of an oxide on the alloy surface. As a method for forming the oxide film, for example, an alloy is formed into a predetermined linear or mesh shape, and then heat-treated in a wet hydrogen furnace at a temperature of 900 to 1200 ° C. and a hydrogen dew point of 0 to 40 ° C. for 5 to 90 minutes. A method of generating an oxide film on the surface by heat treatment at 700 to 1200 ° C. for 1 to 60 minutes in the air can be employed.
[0016]
Mn, like Ni, has a function to increase and adjust the thermal expansion coefficient of the alloy, and is also a component that improves the hot workability of the alloy, and can also be used as a substitute for expensive Ni. In the present invention, as a more preferable additive component, it is contained in a range of 1% by weight or less, more preferably in a range of 0.1 to 1% by weight. Moreover, when Mn increases, an oxide film will peel easily. For this reason, the addition amount is preferably 1.0% or less.
[0017]
Furthermore, Al increases the adhesion strength between the oxide film formed on the alloy surface and the metal and improves the sealing property with glass, but the thermal expansion coefficient tends to increase as the amount added increases. The addition amount is 1.5% or less, more preferably 0.05 to 1.5%.
[0018]
Si improves the workability of the alloy, but if it is in an excessive amount, it adversely affects the workability of the alloy, so the addition amount is 4.0% or less.
[0019]
Mo, Nb, and Zr all have the effect of improving the strength of the alloy, but when the amount exceeds 1.5%, the thermal expansion coefficient of the alloy increases, the adhesion strength with the glass decreases, and the sealing property Is deteriorated, the content thereof is 1.5% or less, and more preferably in the range of 0.01 to 1.5%.
[0020]
By further processing the glass-strengthening alloy having the above composition into a linear or mesh shape, the contact area with the glass can be increased, and a reinforcing wire or reinforcing material for glass strengthening with improved strengthening function can be obtained. .
[0021]
According to the glass-strengthening alloy according to the above configuration, it is a Fe-based alloy containing a predetermined amount of Ni, Co, and Cr, and has an average coefficient of thermal expansion of 100 × 10 −7 to 110 × 10 −7 / ° C. Since it approximates the coefficient of thermal expansion of the material, it is possible to obtain a tempered glass having high adhesion strength with glass and excellent impact resistance. Further, by forming a film made of an oxide on the alloy surface, it is possible to further increase the adhesion strength with the glass material.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be specifically described with reference to the following examples and comparative examples.
[0023]
Alloys such as Ni, Co, Cr, Mn, Al, Si, and other elements are blended so that the amounts shown in Table 1 are the values shown in Table 1. An ingot was prepared. Each of the obtained alloy ingots was subjected to hot forging and hot rolling, and further subjected to cold rolling after intermediate annealing to produce rolled materials having a thickness of 0.5 mm.
[0024]
And the sample piece for a thermal expansion coefficient measurement and the sample piece for a glass sealing test were created from each produced rolling material. While the thermal expansion coefficient of the alloy was measured using the sample piece for measuring the thermal expansion coefficient, an oxide film was formed under the following conditions for each sample piece for glass sealing test. That is, the sample piece is oxidized in a wet hydrogen furnace at 1150 ° C. for 5 minutes to 90 minutes, and further subjected to heat treatment in air at 800 ° C. for 5 to 60 minutes to obtain an oxide film (oxide film) having a predetermined thickness. Formed.
[0025]
In order to evaluate the glass adhesion of each glass strengthening alloy, the following sealing test and impact fracture test were performed. That is, in the state where 100 sample pieces prepared as described above were arranged in a horizontal frame, molten soda-lime glass was poured and solidified to prepare tempered glass samples, respectively.
[0026]
And after the said sealing test, the number of samples which the glass crack generate | occur | produced was measured with respect to the total number of tempered glass samples, and it was set as the crack generation rate in the sealing test. In addition, the number of samples in which even a slight amount of bubbles was generated at the contact portion between the sample piece and the glass at the time of sealing was measured and used as the bubble generation sample ratio.
[0027]
Moreover, when the glass of the sealing part was crushed, the number of the metal films exposed by peeling off the oxide film was measured to determine the degree of adhesion. Each measurement result is shown in Table 1 below.
[0028]
[Table 1]
[0029]
As is apparent from the results shown in Table 1 above, according to the glass-strengthening alloys according to the respective examples containing a predetermined amount of Ni, Co, Cr and the like and adjusting the thermal expansion coefficient to a predetermined range, Even when the sealing test was conducted, it was found that since the difference in thermal expansion from the glass material was small, the occurrence rate of glass cracks was small and the durability was excellent. Moreover, even when the impact fracture test was carried out from the state of being sealed on the glass material, the number of exposed metal bullion was small, and it was confirmed that the metal had excellent adhesion strength and impact resistance. Further, even when the sealing test was performed, it was found that the generation ratio of bubbles was very small, and thus it was found to be extremely effective as a reinforcing material for forming tempered glass for electronic devices.
[0030]
On the other hand, in each comparative example made of an alloy outside the composition range of each component specified in the present invention, it is reconfirmed that the difference in thermal expansion from glass becomes large and the incidence of defects such as glass cracks and bubbles increases. did it. In particular, in the conventional alloy of Comparative Example 1, the average thermal expansion coefficient was the same as that of the glass material, but it was also found that the degree of adhesion (bonding strength) with the glass was low and a sufficient reinforcing effect could not be obtained.
[0031]
【The invention's effect】
As described above, the glass-strengthening alloy according to the present invention is a Fe-based alloy containing a predetermined amount of Ni, Co, and Cr, and has an average coefficient of thermal expansion of 100 × 10 −7 to 110 × 10 −. Since the thermal expansion coefficient approximates 7 / ° C. and the glass material, tempered glass having high adhesion strength with glass and excellent impact resistance can be obtained. Further, by forming a film made of an oxide on the alloy surface, it is possible to further increase the adhesion strength with the glass material.
Claims (8)
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