JP2827023B2 - Crystallized glass - Google Patents
Crystallized glassInfo
- Publication number
- JP2827023B2 JP2827023B2 JP1328125A JP32812589A JP2827023B2 JP 2827023 B2 JP2827023 B2 JP 2827023B2 JP 1328125 A JP1328125 A JP 1328125A JP 32812589 A JP32812589 A JP 32812589A JP 2827023 B2 JP2827023 B2 JP 2827023B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- crystallized glass
- crystals
- crystallized
- thermal expansion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0054—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing PbO, SnO2, B2O3
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、磁気記憶装置に用いられる薄膜磁気ヘッド
基板用の結晶化ガラスに関し、特に、OA、VTR、オーデ
ィオの各機器の磁気ヘッド基板として好ましく用いられ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crystallized glass for a thin film magnetic head substrate used in a magnetic storage device, and in particular, as a magnetic head substrate for OA, VTR, and audio equipment. It is preferably used.
［従来の技術］ 一般に薄膜磁気ヘッドは、非磁性体の基板にセンダス
ト、パーマロイ、アモルファス金属等の磁性薄膜を蒸着
やスパッター等することにより作製されている。この非
磁性体の基板としては硬く、耐摩耗性に優れているこ
と、熱膨張係数（α）が100〜200×10-7/℃であること
及び気孔が実質的にないことが必要条件としてあげられ
る。[Prior Art] In general, a thin-film magnetic head is manufactured by depositing or sputtering a magnetic thin film of sendust, permalloy, amorphous metal or the like on a non-magnetic substrate. The requirements for this non-magnetic substrate are that it be hard, have excellent wear resistance, have a coefficient of thermal expansion (α) of 100 to 200 × 10 −7 / ° C., and have substantially no pores. can give.
特に、熱膨張係数が磁性薄膜の熱膨張係数に近い100
〜200×10-7/℃と高い材料が必要である。例えば、特公
昭62−15495号公報、特公昭63−31421号公報には、カー
ネギアイト（Na2O・Al2O3・2SiO2）やネフェリン（Na2O
・Al2O3・2SiO2）を析出させ、118.8〜188.9×10-7/℃
のの熱膨張係数を有する結晶化ガラスが得られることが
開示されている。In particular, the thermal expansion coefficient is close to that of the magnetic thin film.
Materials as high as ~ 200 × 10 -7 / ° C are required. For example, JP-B-62-15495 and JP-B-63-31421, Kanegiaito (Na 2 O · Al 2 O 3 · 2SiO 2) and nepheline (Na 2 O
・ Al 2 O 3・ 2SiO 2 ) is deposited and 118.8-188.9 × 10 -7 / ℃
It is disclosed that a crystallized glass having a thermal expansion coefficient of
［発明が解決しようとする課題］ しかしながら、前記特公昭62−15495号公報記載の結
晶化ガラスでは、MgOがガラス成分としていないために
ガラスの溶融温度が1500℃以上と高いという欠点があ
る。さらに、ガラスが失透し易く析出結晶が不均一とな
り、均一な膨張係数を有する結晶化ガラスを得にくいと
いう欠点がある。又、前記特公昭63−31421号公報記載
の結晶化ガラスでは、ガラスの成分としてB2O3はなく核
形成剤としてP2O5が２〜22wt％と多重に存在するため
に、ガラス溶融中にP2O5が揮発して組成が変化し、その
結果、ガラスは失透し易く析出結晶が不均一となり、均
一な膨張係数を有する結晶化ガラスとなりにくいという
欠点がある。[Problems to be Solved by the Invention] However, the crystallized glass described in JP-B-62-15495 has a drawback that the melting temperature of the glass is as high as 1500 ° C. or higher because MgO is not a glass component. Further, there is a disadvantage that the glass is easily devitrified and the precipitated crystals become non-uniform, so that it is difficult to obtain a crystallized glass having a uniform expansion coefficient. In order and in the crystallized glass of Japanese Patent Publication 63-31421 JP, the P 2 O 5 as a nucleating agent B 2 O 3 is not a component of the glass is present in 2～22Wt% and multiplexing, glass melting P 2 O 5 volatilizes therein and changes the composition. As a result, the glass is liable to be devitrified, the precipitated crystals become non-uniform, and there is a disadvantage that it is difficult to form a crystallized glass having a uniform expansion coefficient.
したがって、本発明の目的は、その出発材料であるガ
ラスを作製するための溶融温度が低く、ガラス失透しに
くく、熱処理後の熱膨張係数が大きく、かつ均一な熱膨
張係数を有した実質的に気孔のない結晶化ガラスを提供
するものである。Accordingly, an object of the present invention is to substantially reduce the melting temperature for producing glass as a starting material, prevent glass from devitrifying, have a large coefficient of thermal expansion after heat treatment, and have a uniform coefficient of thermal expansion. The present invention provides a crystallized glass having no pores.
［課題を解決するための手段］ 本発明は上記目的を達成するためになされたものであ
り、本発明の結晶化ガラスは、重量％で、SiO2が37.0〜
49.5％、Al2O3が19.0〜31.0％、B2O3が0.2〜8.0％、Na2
Oが18.0〜29.0％、MgOが3.0〜13.0％、TiO2が3.2〜13.0
％、ZrO2が1.0〜4.0％を含有するガラスを処理し、カー
ネギアイト結晶及び／又はネフェリン結晶を析出してな
ることを特徴としている。[Means for Solving the Problems] The present invention has been made to achieve the above object, and the crystallized glass of the present invention contains 37.0% by weight of SiO 2 in weight%.
49.5%, Al 2 O 3 is 19.0~31.0%, B 2 O 3 is 0.2~8.0%, Na 2
O is 18.0 to 29.0%, MgO is from 3.0 to 13.0%, TiO 2 is 3.2 to 13.0
%, ZrO 2 containing 1.0 to 4.0% is treated to precipitate a carnegieite crystal and / or a nepheline crystal.
次に、各成分の限定理由を述べる。 Next, reasons for limiting each component will be described.
SiO2はガラス骨格を形成し、かつカーネギアイト結晶
（Na2O・Al2O3・2SiO2）及び／又はネフェリン結晶（Na
2O・Al2O3・2SiO2）の成分であり、この量が37.0wt％未
満ではガラスが失透し易く、前記結晶の析出量が少なく
なるので好ましくない。又、この量が49.5wt％を超える
とガラスが安定化し、処理しても前記結晶が析出しにく
くなるので好ましくない。Al2O3を前記結晶の成分であ
り、この量が19.0wt％未満では前記結晶が析出しにく
く、この量が31.0wt％を超えるとガラスが失透し易くな
るので好ましくない。B2O3はガラス骨格を成形する成分
であり、このB2O3を含むことにより、結晶化前のガラス
は失透しにくくなる。この量が0.2wt％未満では失透を
おさえる効果が少なく、この量が8.0wt％を超えるとガ
ラスが安定化し、処理しても前記結晶が析出しにくくな
る。さらに、ガラス溶融中のB2O3の揮発が多くなり均一
な結晶析出が得にくくなるので好ましくない。Na2Oは前
記結晶の成分であり、ガラスの溶融温度を下げるもので
ある。この量が18.0wt％未満では溶融温度を下げる効果
が少なく、前記結晶の析出量も少なくなるので好ましく
ない。又、この量が29.0wt％を超えると結晶化ガラスの
化学的耐久性が悪くなるので好ましくない。MgOはガラ
スの溶融温度を下げ、失透をおさえる成分である。この
量が3.0wt％未満ではガラスの溶融温度を下げ、失透を
おさえる効果が少なく、この量が13.0wt％を超えると前
記結晶が析出しにくくなるので好ましくない。TiO2は前
記結晶を析出するための核形成剤として働き、この量が
3.2wt％未満では核成形剤としての効果が少なく、この
量が、13.0wt％を超えるとTiO2又はTiO2を含む結晶が多
く析出するので好ましくない。ZrO2も前記結晶を析出す
るための核形成剤として働く。この量が1.0wt％未満で
は核形成剤としての効果が少なく、この量が4.0wt％を
超えるとガラスが失透し易くなるので好ましくない。Ti
O2とZrO2は共に核形成剤として働くがTiO2とZrO2の量は
同程かあるいはTiO2が多い方が均一な結晶が析出する。SiO 2 forms a glass skeleton and Kanegiaito crystal (Na 2 O · Al 2 O 3 · 2SiO 2) and / or nepheline crystals (Na
A component of the 2 O · Al 2 O 3 · 2SiO 2), liable glass is devitrified in the amount is less than 37.0wt%, since the precipitation amount of the crystals is reduced undesirably. On the other hand, if the amount exceeds 49.5% by weight, the glass is stabilized and the crystals hardly precipitate even after the treatment, which is not preferable. Al 2 O 3 is a component of the crystal. If the amount is less than 19.0 wt%, the crystal is unlikely to precipitate, and if the amount exceeds 31.0 wt%, the glass tends to be devitrified, which is not preferable. B 2 O 3 is a component that forms a glass skeleton. By including this B 2 O 3 , the glass before crystallization hardly devitrifies. If this amount is less than 0.2 wt%, the effect of suppressing devitrification is small, and if this amount exceeds 8.0 wt%, the glass is stabilized, and the crystals are unlikely to precipitate even when treated. Further, the volatilization of B 2 O 3 during the melting of the glass increases, making it difficult to obtain uniform crystal precipitation, which is not preferable. Na 2 O is a component of the crystal and lowers the melting temperature of glass. If the amount is less than 18.0% by weight, the effect of lowering the melting temperature is small, and the amount of the crystals deposited is undesirably reduced. On the other hand, if this amount exceeds 29.0% by weight, the chemical durability of the crystallized glass deteriorates, which is not preferable. MgO is a component that lowers the melting temperature of glass and suppresses devitrification. If this amount is less than 3.0 wt%, the effect of lowering the melting temperature of the glass and suppressing devitrification is small, and if this amount exceeds 13.0 wt%, the crystals are difficult to precipitate, which is not preferable. TiO 2 acts as a nucleating agent to precipitate the crystals, and this amount
If the amount is less than 3.2 wt%, the effect as a nucleating agent is small, and if the amount exceeds 13.0 wt%, TiO 2 or crystals containing TiO 2 are undesirably precipitated. ZrO 2 also acts as a nucleating agent for depositing the crystals. If this amount is less than 1.0 wt%, the effect as a nucleating agent is small, and if this amount exceeds 4.0 wt%, the glass tends to be devitrified, which is not preferable. Ti
Both O 2 and ZrO 2 act as nucleating agents, but the same amount of TiO 2 and ZrO 2 or more TiO 2 results in more uniform crystals.
又、その他の成分としてガラス融液の脱泡剤として、
As2O3及びSb2O3を1.0wt％以下添加することができる。
脱泡剤が1.0wt％を超えても脱泡剤としての効果はかわ
らない。In addition, as a defoaming agent for glass melt as other components,
As 2 O 3 and Sb 2 O 3 can be added in an amount of 1.0 wt% or less.
Even if the defoaming agent exceeds 1.0% by weight, the effect as the defoaming agent does not change.
［実施例］ 次に、本発明の実施例を述べるが、本発明はこれらの
実施例に限定されるものではない。[Examples] Next, examples of the present invention will be described, but the present invention is not limited to these examples.
（実施例１） 原料としても、SiO2、Al（OH）３、H3BO3、MgCO3、Na
2CO3、NaNO3、TiO2、ZrO2を原料として、SiO2が41.0wt
％,Al2O3が27.0wt％、B2O3が0.5wt％、Na2Oが22.5wt
％、MgOが3.7wt％、TiO2が3.7wt％、ZrO2が1.6wt％でガ
ラス重量が100gとなるように調整混合し、白金ルツボに
入れ、1430℃で４時間溶融した。その後、約200℃の鋼
板上にガラス融液をキャストした。このとき、ガラスの
失透はなかった。そして、あらかじめ600℃に保持した
アニール炉に入れて、温室まで冷却し出発材料であるガ
ラスを得た。(Example 1) SiO 2 , Al (OH) 3 , H 3 BO 3 , MgCO 3 , Na
2 CO 3 , NaNO 3 , TiO 2 , ZrO 2 as raw materials, SiO 2 41.0 wt
%, Al 2 O 3 27.0 wt%, B 2 O 3 0.5 wt%, Na 2 O 22.5 wt%
%, MgO of 3.7 wt%, TiO 2 of 3.7 wt%, and ZrO 2 of 1.6 wt% were adjusted and mixed so that the glass weight became 100 g, put in a platinum crucible, and melted at 1430 ° C. for 4 hours. Thereafter, the glass melt was cast on a steel plate at about 200 ° C. At this time, there was no devitrification of the glass. Then, the glass was placed in an annealing furnace kept at 600 ° C. in advance and cooled to a greenhouse to obtain glass as a starting material.
得られたガラスには結晶は存在していなかった。この
ガラスの特性を日本光学硝子工業会規格JOGIS−1975に
基づいて測定したところ、ガラス転移点（Tg）が605
℃、屈伏点（Ts）が695℃、熱膨張係数（α）が109×10
-7/℃、比重が2.57であった。No crystals were present in the obtained glass. When the properties of this glass were measured based on the Japan Optical Glass Industrial Association standard JOGIS-1975, the glass transition point (Tg) was 605.
° C, yield point (Ts) 695 ° C, coefficient of thermal expansion (α) 109 × 10
-7 / ° C, specific gravity 2.57.
この出発材料であるガラスから約30×30mmの大きさに
切り出したものを電気炉により熱処理し結晶化させた。
結晶化スケジュールは、室温から600℃までは250℃/hで
昇温し、600℃から1050℃までは90℃/hで昇温し、1050
℃で1.5時間保持したのち180℃/hで室温まで冷却した。A glass cut out from this starting material into a size of about 30 × 30 mm was heat-treated in an electric furnace and crystallized.
The crystallization schedule is as follows: from room temperature to 600 ° C, the temperature is raised at 250 ° C / h; from 600 ° C to 1050 ° C, the temperature is raised at 90 ° C / h;
After holding at 1.5 ° C. for 1.5 hours, the mixture was cooled to room temperature at 180 ° C./h.
得られた結晶化ガラスの一部を粉砕してＸ線回折によ
り析出結晶を調べたところカーネギアイト（Na2O・Al2O
3・2SiO2）及びネフェリン（Na2O・Al2O3・2SiO2）が析
出していることが確認された。Obtained by grinding a part of the crystallized glass were examined and the precipitated crystals by X-ray diffraction Kanegiaito (Na 2 O · Al 2 O
3 · 2SiO 2) and nepheline (Na 2 O · Al 2 O 3 · 2SiO 2) was confirmed to be precipitated.
又、得られた結晶化ガラスの特性を日本光学硝子工業
会規格JOGIS−1975に基づいて測定したところ、熱膨張
係数（α）が137×10-7/℃、ヌープの硬さ（Hk）が520k
g/mm2、比重（S.G.）が2.63であった。これらの値は結
晶化ガラスのどこでも誤差範囲内で一致していた。又、
この結晶化ガラスには実質的に気孔はなかった。When the properties of the obtained crystallized glass were measured based on the Japan Optical Glass Industrial Standard JOGIS-1975, the coefficient of thermal expansion (α) was 137 × 10 -7 / ° C, and the hardness of Knoop (Hk) was 520k
g / mm 2 and specific gravity (SG) was 2.63. These values were consistent within the error range everywhere in the crystallized glass. or,
The crystallized glass had substantially no pores.
このことから、本実施例の結晶化ガラスは、その出発
材料であるガラスを作製するための溶融温度が低く、失
透もなく、熱処理後の熱膨張係数が130×10-7/℃で気孔
も実質的にないものであった。From this, the crystallized glass of this example has a low melting temperature for producing glass as a starting material thereof, has no devitrification, has a thermal expansion coefficient of 130 × 10 −7 / ° C. after heat treatment, and has pores. Was also virtually absent.
（実施例２〜４） 実施例１と同様の組成ガラスを、結晶化させる工程
（熱処理）で1050℃で1.5時間保持する代わりに、900℃
（実施例２）、1000℃（実施例３）、1100℃（実施例
４）で1.5時間保持した他は実施例１と同程にして結晶
化（熱処理）を行なった。(Examples 2 to 4) Instead of holding the glass having the same composition as in Example 1 at 1050 ° C for 1.5 hours in the crystallization step (heat treatment), 900 ° C
(Example 2) Crystallization (heat treatment) was performed in the same manner as in Example 1 except that the temperature was maintained at 1000 ° C (Example 3) and 1100 ° C (Example 4) for 1.5 hours.
得られた結晶化ガラスにはカーネギアイト及びネフェ
リンが析出していた。これを実施例１と同様にして特性
を測定した。その結果を実施例１と共に表１に示す。こ
れらの値は結晶化ガラスのどこでも誤差範囲内で一致し
ていた。Carnegieite and nepheline were precipitated in the obtained crystallized glass. The characteristics were measured in the same manner as in Example 1. The results are shown in Table 1 together with Example 1. These values were consistent within the error range everywhere in the crystallized glass.
この結果から、実施例２〜４の結晶化ガラスは、その
出発材料であるガラスを作製するための溶融温度が低
く、失透もなく、熱処理後の熱膨張係数が139×10-7〜1
47×10-7/℃で気孔も実質的にないものであった。From these results, the crystallized glasses of Examples 2 to 4 have a low melting temperature for producing glass as a starting material, have no devitrification, and have a thermal expansion coefficient of 139 × 10 −7 to 1 after heat treatment.
At 47 × 10 −7 / ° C., there were substantially no pores.
さらに、本実施例１〜４の結晶化ガラスは、結晶化温
度により熱膨張係数か変化し特に、結晶化温度が1000〜
1100℃の間で極少値をもつものであった。Further, the crystallized glass of Examples 1 to 4, the coefficient of thermal expansion changes depending on the crystallization temperature, especially, the crystallization temperature is 1000 ~
It had a minimum value between 1100 ° C.
（実施例５〜20） 原料として実施例１の原料にAs2O3及びSb2O3を加え、
ガラス組成及び結晶化のための保持温度を種々変えた他
は、実施例１と同様にして、結晶化ガラスを得た。得ら
れた結晶変ガラスはカーネギアイト及び／又はネフェリ
ンが析出していた。そして、実施例１と同様に特性を測
定した。これらのガラス組成及び測定結果を表１に示
す。これらの値は結晶化ガラスのどこでも誤差範囲内で
一致していた。(Examples 5 to 20) As a raw material, As 2 O 3 and Sb 2 O 3 were added to the raw material of Example 1;
A crystallized glass was obtained in the same manner as in Example 1, except that the glass composition and the holding temperature for crystallization were variously changed. In the obtained crystal-modified glass, carnegieite and / or nepheline had been precipitated. Then, the characteristics were measured in the same manner as in Example 1. Table 1 shows the glass compositions and measurement results. These values were consistent within the error range everywhere in the crystallized glass.
この結果から、実施例５〜20の結晶化ガラスは、その
出発材料であるガラスを作製するための溶融温度が低
く、失透もなく、熱処理後の熱膨張係数が135×10-7〜1
58×10-7/℃で気孔も実質的にないものであった。From these results, the crystallized glass of Examples 5 to 20 has a low melting temperature for producing glass as a starting material, has no devitrification, and has a thermal expansion coefficient of 135 × 10 −7 to 1 after heat treatment.
At 58 × 10 −7 / ° C., there were substantially no pores.
（比較例１） 実施例１のと同様の原料を用いて、SiO2が40.5wt％,A
l2O3が29.5wt％、Na2Oが22.2wt％、TiO2が1.8wt％、ZrO
2が1.8wt％、ZnOが4.2wt％でガラス重量が100gとなるよ
うに調整混合し、白金ルツボに入れ、1430℃で４時間溶
融したが、均一なガラス融液とはならなかった。(Comparative Example 1) Using the same raw material as in Example 1, SiO 2 was 40.5 wt%, A
l 2 O 3 29.5 wt%, Na 2 O 22.2 wt%, TiO 2 1.8 wt%, ZrO
2 was adjusted to 1.8 wt%, ZnO was 4.2 wt%, and the glass weight was adjusted to 100 g and mixed in a platinum crucible. The mixture was melted at 1430 ° C. for 4 hours, but a uniform glass melt was not obtained.
（比較例２） 実施例１と同様の原料とNaPO3を用いて、SiO2が39.7w
t％,Al2O3が23.5wt％、NaOが3.6wt％、Na2Oが23.0wt
％、TiO2が3.7wt％、P2O5が6.5wt％となるように実施例
１と同様にして出発材料となるガラスを作製した。得ら
れたガラスに結晶はなかった。(Comparative Example 2) Using the same raw materials as in Example 1 and NaPO 3 , SiO 2 was 39.7 watts.
t%, Al 2 O 3 23.5 wt%, NaO 3.6 wt%, Na 2 O 23.0 wt
%, TiO 2 was 3.7 wt%, and P 2 O 5 was 6.5 wt%, and a glass as a starting material was produced in the same manner as in Example 1. The obtained glass had no crystals.
このガラスを900℃で1.5時間保持した他は比較例１と
同様にして熱処理を行なった。得られた結晶化ガラスは
析出結晶が不均一なため割れていた。A heat treatment was performed in the same manner as in Comparative Example 1 except that the glass was kept at 900 ° C. for 1.5 hours. The obtained crystallized glass was broken due to non-uniform precipitated crystals.
［発明の効果］ 以上詳述したように本発明の結晶化ガラスは、その出
発材料であるガラスを作製するための溶融温度が低く、
失透もなく、熱処理後の熱膨張係数が大きく、かつ均一
な熱膨張係数を有し、気孔も実質的にない結晶化ガラス
となる。 [Effects of the Invention] As described above in detail, the crystallized glass of the present invention has a low melting temperature for producing glass as a starting material,
The crystallized glass has no devitrification, has a large coefficient of thermal expansion after heat treatment, has a uniform coefficient of thermal expansion, and has substantially no pores.
特に、本発明の結晶化ガラスは適切な熱膨張係数及び
硬さを容易に選択できるので、薄膜磁気ヘッド用基板と
して好ましく用いることができる。In particular, since the crystallized glass of the present invention can easily select an appropriate coefficient of thermal expansion and hardness, it can be preferably used as a substrate for a thin-film magnetic head.
Claims (1)
9.0〜31.0％、B2O3が0.2〜8.0％、Na2Oが18.0〜29.0
％、MgOが3.0〜13.0％、TiO2が3.2〜13.0％、ZrO2が1.0
〜4.0％を含有するガラスを処理し、カーネギアイト結
晶及び／又はネフェリン結晶を析出してなることを特徴
とする結晶化ガラス。(1) SiO 2 is 37.0 to 49.5% and Al 2 O 3 is 1% by weight.
9.0~31.0%, B 2 O 3 is 0.2~8.0%, Na 2 O is from 18.0 to 29.0
%, MgO 3.0-13.0%, TiO 2 3.2-13.0%, ZrO 2 1.0
A crystallized glass obtained by treating a glass containing up to 4.0% to precipitate carnegieite crystals and / or nepheline crystals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1328125A JP2827023B2 (en) | 1989-12-20 | 1989-12-20 | Crystallized glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1328125A JP2827023B2 (en) | 1989-12-20 | 1989-12-20 | Crystallized glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03193640A JPH03193640A (en) | 1991-08-23 |
| JP2827023B2 true JP2827023B2 (en) | 1998-11-18 |
Family
ID=18206768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1328125A Expired - Fee Related JP2827023B2 (en) | 1989-12-20 | 1989-12-20 | Crystallized glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2827023B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4736207B2 (en) * | 2001-03-08 | 2011-07-27 | 旭硝子株式会社 | Crystallized glass for optical filter substrate and optical filter |
| CN102849951B (en) * | 2011-06-28 | 2015-08-12 | 赵凤宇 | A kind of devitrified glass and nonmetal compound wear resistant material and preparation method thereof |
| WO2023127306A1 (en) * | 2021-12-27 | 2023-07-06 | 日本電気硝子株式会社 | Crystallized glass and crystalline glass |
-
1989
- 1989-12-20 JP JP1328125A patent/JP2827023B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03193640A (en) | 1991-08-23 |
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