US4741849A
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Ceramic body glass composition for bonding and filling ceramic parts thereof
Assignee: Hitachi Ltd
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Filing: 1987-01-12
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Granted: 1988-05-03
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Expires: 2007-01-12
Abstract
Abstract The glass composition is particularly applicable for ferrite constituents used for a highly efficient magnetic head. The composition essentially consists of (a) 55-70 wt % of V2O5, (b) 18-wt % of P2O5, (c1) up to 10 wt % of at least one alkaline metal oxide selected from Na2O, K2O, Rb2O, and Cs2O and (c3) up to 10 wt % of Tl2O. The composition is in a non-crystalline state during reheating and has a softening temperature of 310 DEG C.-400 DEG C. and a thermal expansion coefficient of 70-130x10-7/ DEG C.
Inventors
- 👤 Takashi Naito
- 👤 Takashi Namekawa
- 👤 Satoru Ogihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:41
CPC Classifications
C; C03; C03C; C03C4/00; C03C3/00; C03C3/12; C03C3/16; C03C3/21; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B37/00; C04B37/003; C04B37/005; G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; C04B2237/00; C04B2237/02; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A glass composition for bonding and filling ceramic constituents which consist essentially of: (a) 55-70 wt% of vanadium pentoxide; (b) 17-25 wt% of phosphorous pentoxide; (c1) 1.0-10 wt% of at least one alkaline metal monoxide selected from the group consisting of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O; and (c2) 1.0-10 wt% of Tl 2 O, with the proviso that the amount of (c1)+(c2) is not less than 5 wt%.
Claim 2
Dependent Claim
76 words
A glass composition for bonding and filling ceramic constituents which consist essentially of: (a) 55-70 wt% of vanadium pentoxide; (b) 17-25 wt% of phosphorous pentoxide; (c1) 1.0-10 wt% of at least one alkaline metal monoxide selected from the group consisting of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O; and (c2) 1.0-10 wt% of Tl 2 O, with the proviso that the amount of (c1)+(c2) is not less than 5 wt%.
Claim 3
Dependent Claim
137 words
A glass composition according to claim 1 further including at least one selected from Boron oxide B 2 O 3 , Zinc Oxide ZnO Bismuth trioxide Bi 2 O 3 , Silicon dioxide SiO 2 , Aluminum oxide Al 2 O 3 , Antimony pentoxide Sb 2 O 5 and Cobalt monoxide CoO, (d1) the amount of B 2 O 3 is up to 10 wt%, (d2) the amount of ZnO is up to 16 wt%, (d3) the amount of Bi 2 O 3 is up to 12 wt%, (d4) the amount of SiO 2 is up to 3 wt%, (d5) the amount of Al 2 O 3 is up to 5 wt%, (d6) the amount of Sb 2 O 5 is up to 7 wt%, and (d7) the amount of CoO is up to 1 wt%.
Claim 4
Dependent Claim
20 words
A glass composition according to claim 1, wherein the glass composition is in a substautially non-crystalline state during reheating thereof.
Claim 5
Dependent Claim
27 words
A glass composition according to claim 1, wherein the glass composition has a softening temperature of 310°-400° C. and a thermal expansion coefficient of 70-130×10 -7 /°C.
Claim 6
Dependent Claim
26 words
A glass composition according to claim 1, wherein the glass composition has a small variation in softening temperatures regardless of variation in thermal expansion coefficients therof.
Claim 7
Dependent Claim
86 words
A ceramic body including ceramic constituents and a glass composition for bonding and filling said ceramic constituents, wherein said glass composition consists essentially of: (a) 55-70 wt% of vanadium pentoxide; (b) 18-25 wt% of phosphorous pentoxide; (c1) 1.0-10 wt% at least one alkaline metal monoxide selected from the group consisting of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O; and (c2) 1.0-10 wt% of Tl 2 O, with the proviso that the amount of (c1)+(c2) is not less than 5 wt%.
Claim 8
Dependent Claim
86 words
A ceramic body including ceramic constituents and a glass composition for bonding and filling said ceramic constituents, wherein said glass composition consists essentially of: (a) 55-70 wt% of vanadium pentoxide; (b) 18-25 wt% of phosphorous pentoxide; (c1) 1.0-10 wt% at least one alkaline metal monoxide selected from the group consisting of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O; and (c2) 1.0-10 wt% of Tl 2 O, with the proviso that the amount of (c1)+(c2) is not less than 5 wt%.
Claim 9
Dependent Claim
147 words
A ceramic body according to claim 6, wherein said glass composition further including at least one member selected from the group consisting of boron oxide (B 2 O 3 ), zinc oxide (ZnO), bismuth trioxide (Bi 2 O 3 ), silicon dioxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), antimony pentoxide (Sb 2 O 5 ), and cobalt monoxide (CoO), (d1) the amount of B 2 O 3 is up to 10 wt%, (d2) the amount of ZnO is up to 16 wt%, (d3) the amount of Bi 2 O 3 is up to 12 wt%, (d4) the amount of SiO 2 is up to 3 wt%, (d5) the amount of Al 2 O 3 is up to 5 wt%, (d6) the amount of Sb 2 O 5 is up to 7 wt%, and (d7) the amount of CoO is up to 1 wt%.
Claim 10
Dependent Claim
20 words
A ceramic body according to claim 6, wherein said glass composition is in a substantially non-crystalline state during reheating thereof.
Claim 11
Dependent Claim
27 words
A ceramic body according to claim 6, wherein said glass composition has a softening temperature of 310°-400° C. and a thermal expansion coefficient of 70-130×10 -7 /°C.
Claim 12
Dependent Claim
25 words
A ceramic body according to claim 6, wherein said glass composition has small variation in softening temperatures regardless of variation in thermal expansion coefficients thereof.
Claim 13
Dependent Claim
86 words
A ferrite body including ferrite constituents and glass composition for bonding and filling said ferrite constituents, wherein said glass composition consists essentially of: (a) 55-70 wt% of vanadium pentoxide; (b) 18-25 wt% of phosphorous pentoxide; (c1) 1.0-10 wt% of at least one alkaline metal monoxide selected from the group consisting of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O; and (c2) 1.0-10 wt% of Tl 2 O, with the proviso that the amount of (c1)+(c2) is not less than 5 wt%.
Claim 14
Dependent Claim
86 words
A ferrite body including ferrite constituents and glass composition for bonding and filling said ferrite constituents, wherein said glass composition consists essentially of: (a) 55-70 wt% of vanadium pentoxide; (b) 18-25 wt% of phosphorous pentoxide; (c1) 1.0-10 wt% of at least one alkaline metal monoxide selected from the group consisting of Na 2 O, K 2 O, Rb 2 O, and Cs 2 O; and (c2) 1.0-10 wt% of Tl 2 O, with the proviso that the amount of (c1)+(c2) is not less than 5 wt%.
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