JPS643032A - Crystallized glass and its production - Google Patents

Crystallized glass and its production

Info

Publication number
JPS643032A
JPS643032A JP29876287A JP29876287A JPS643032A JP S643032 A JPS643032 A JP S643032A JP 29876287 A JP29876287 A JP 29876287A JP 29876287 A JP29876287 A JP 29876287A JP S643032 A JPS643032 A JP S643032A
Authority
JP
Japan
Prior art keywords
glass
0w5wt
heat
0w2wt
0w10wt
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.)
Granted
Application number
JP29876287A
Other languages
Japanese (ja)
Other versions
JPH013032A (en
JPH0667775B2 (en
Inventor
Naoyuki Gotou
Makoto Hayasaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ohara Inc
Original Assignee
Ohara Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ohara Inc filed Critical Ohara Inc
Priority to JP29876287A priority Critical patent/JPH0667775B2/en
Publication of JPS643032A publication Critical patent/JPS643032A/en
Publication of JPH013032A publication Critical patent/JPH013032A/en
Publication of JPH0667775B2 publication Critical patent/JPH0667775B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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  • Glass Compositions (AREA)

Abstract

PURPOSE: To obtain a glass having a heat-expansion curve free from large kinking by melting a glass prepared by adding a specific amount of a fluoride to a specifically composed SiO2-Al2O3-ZnO-MgO-PbO-TiO2, forming the resultant glass composition, heating the formed product and crystallizing it with heat.
CONSTITUTION: A glass starting material is prepared by using 30W65wt.% of SiO2, 5W25wt.% of Al2O3, 10.5W40wt.% of ZnO, 3.5W20wt.% of MgO, 0.5W10wt.% of PbO, 0W15wt.% of CaO+SrO+BaO, 2W15wt.% of TiO2, 0W10wt.% of B2O3, 0W10wt.% of La2O+Y2O3+Gd2O3+Ta2O5+Nb2O5+WO3, 0W5wt.% of ZrO2+P2O5+SnO2, with proviso that ZrO2 is 0W2.5wt.%, P2O5 0W5wt.%. SnO2 is 0W2wt.% As2O3+Sb2O3 is 0W2wt.% and adding fluorides of the metals in the metal oxides used in such an amount as the total amount is 0W5wt.%, calculated as F element. The starting material is melted, formed, then heated at elevated temperature and crystallized at a temperature lower than 1,150°C. Thus, a crystalline glass which is suitable for a magnetic head base is obtained, because it has a wide range of heat expansion coefficient, high dense texture and uniformity.
COPYRIGHT: (C)1989,JPO&Japio
JP29876287A 1987-02-05 1987-11-26 Crystallized glass and manufacturing method thereof Expired - Fee Related JPH0667775B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29876287A JPH0667775B2 (en) 1987-02-05 1987-11-26 Crystallized glass and manufacturing method thereof

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP62-25991 1987-02-05
JP2599187 1987-02-05
JP29876287A JPH0667775B2 (en) 1987-02-05 1987-11-26 Crystallized glass and manufacturing method thereof

Publications (3)

Publication Number Publication Date
JPS643032A true JPS643032A (en) 1989-01-06
JPH013032A JPH013032A (en) 1989-01-06
JPH0667775B2 JPH0667775B2 (en) 1994-08-31

Family

ID=26363708

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29876287A Expired - Fee Related JPH0667775B2 (en) 1987-02-05 1987-11-26 Crystallized glass and manufacturing method thereof

Country Status (1)

Country Link
JP (1) JPH0667775B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208343A (en) * 1988-02-15 1989-08-22 Ohara Inc Transparent crystallized glass
JPH03164445A (en) * 1989-08-11 1991-07-16 Ohara Inc Transparent crystallized glass
CN113929307A (en) * 2021-11-23 2022-01-14 海南大学 Directional crystallization LAS microcrystalline glass and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208343A (en) * 1988-02-15 1989-08-22 Ohara Inc Transparent crystallized glass
JPH03164445A (en) * 1989-08-11 1991-07-16 Ohara Inc Transparent crystallized glass
CN113929307A (en) * 2021-11-23 2022-01-14 海南大学 Directional crystallization LAS microcrystalline glass and preparation method thereof

Also Published As

Publication number Publication date
JPH0667775B2 (en) 1994-08-31

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees