US4804823A
Expired / Lapsed
US
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Ceramic heater
Assignee: Kyocera Corp
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Filing: 1987-07-29
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Granted: 1989-02-14
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Expires: 2007-07-29
Abstract
Abstract A ceramic heater having a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both the ends of the heat-generating resistor, wherein the ceramic substrate is composed of a sintered body of a nitride of an element selected from the group consisting of silicon and aluminum and the heat-generating resistor is composed of a ceramic layer containing titanium nitride (TiN) or tungsten carbide (WC).
Inventors
- 👤 Norio Okuda
- 👤 Noriyoshi Nakanishi
- 👤 Masahiro Yamamoto
- 👤 Shinsuke Takenishi
- 👤 Kenichiro Miyahara
- 👤 Hiroaki Sonoda
- 👤 Masanobu Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:44
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5053; C04B41/80; C04B41/81; C04B41/85; C04B41/87
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
77 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate consists essentially of a sintered body of a nitride of an element selected from the group consisting of silicon and aluminum and the heat-generating resistor comprises a ceramic layer containing titanium nitride (TiN) or tungsten carbide (WC).
Claim 2
Dependent Claim
77 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate consists essentially of a sintered body of a nitride of an element selected from the group consisting of silicon and aluminum and the heat-generating resistor comprises a ceramic layer containing titanium nitride (TiN) or tungsten carbide (WC).
Claim 3
Dependent Claim
41 words
A ceramic heater as set forth in claim 1, wherein said heat-generating resistor comprises a paste layer containing titanium nitride (TiN) or tungsten carbide (WC) applied in a predetermined pattern on a green sheet of the ceramic substrate and subsequently sintered.
Claim 4
Dependent Claim
24 words
A ceramic heater as set claim 1, wherein the heat-generating resistor has a resistance temperature coefficient (TCR) of 1×10 -3 to 2×10 -3 .
Claim 5
Dependent Claim
39 words
A ceramic heater as set forth in claim 1, wherein the heat-generating resistor layer comprises terminal-attaching portions having a large sectional area and a heat-generating intermediate portion having a small sectional area, which is located between the terminal-attaching portions.
Claim 6
Dependent Claim
38 words
A ceramic heater as set forth in claim 1, wherein the ceramic substrate is a sintered body of silicon nitride (Si 3 N 4 ) and the heat-generating resistor layer is a ceramic layer containing titanium nitride (TiN).
Claim 7
Dependent Claim
30 words
A ceramic heater as set forth in claim 5, wherein the heat-generating resistor layer comprises a sintered body comprising (a) titanium nitride, (b) silicon nitride and (c) a sintering aid.
Claim 8
Dependent Claim
24 words
A ceramic heater as set forth in claim 6, wherein the sintering aid is selected from the group consisting of yttria, magnesia and alumina.
Claim 9
Dependent Claim
51 words
A ceramic heater as set forth in claim 6, wherein titanium nitride is present in an amount of 40 to 85% by weight, silicon nitride is present in an amount of 20 to 54% by weight and the sintering aid is present in an amount of 1 to 10% by weight.
Claim 10
Dependent Claim
82 words
A ceramic heater as set forth in claim 5, wherein the heat-generating resistor layer is a sintered body of a composition comprising titanium nitride and silicon carbide in an amount of 0.05 to 8% by weight based on titanium nitride, the sintered body has a chemical structure in which at least a part of SiC is solid-dissolved in the TiN lattice, and the sintered body has a density of at least 4.2 g/cm 3 and a specific resistance lower than 40 μΩ-cm.
Claim 11
Dependent Claim
63 words
A ceramic heater as set forth in claim 5, wherein the heat-generating resistor layer is a sintered body of a composition comprising 20 to 70% by weight of Si 3 N 4 , 30 to 75% by weight of a sintering aid comprising TiN and 0.1 to 9% by weight of MgO or a compound to be converted to MgO under sintering conditions.
Claim 12
Dependent Claim
32 words
A ceramic heater as set forth in claim 1, wherein the ceramic substrate is a sintered body of aluminum nitride and the heat-generating resistor layer is a ceramic layer containing titanium nitride.
Claim 13
Dependent Claim
30 words
A ceramic heater as set forth in claim 1, wherein the ceramic substrate is a sintered body of silicon nitride and the heat-generating resistor layer is a tungsten carbide layer.
Claim 14
Dependent Claim
111 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate consists essentially of a sintered body of a nitride of an element selected from the group consisting of silicon and aluminum, the heat-generating resistor comprises terminal-attaching portions having a large sectional area and a heat-generating intermediate portion having a small sectional area, which is located between the terminal-attaching portions, the terminal-attaching portions comprise a ceramic layer containing tungsten carbide, and the heat-generating intermediate portion comprises a ceramic layer containing titanium nitride.
Claim 15
Dependent Claim
111 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate consists essentially of a sintered body of a nitride of an element selected from the group consisting of silicon and aluminum, the heat-generating resistor comprises terminal-attaching portions having a large sectional area and a heat-generating intermediate portion having a small sectional area, which is located between the terminal-attaching portions, the terminal-attaching portions comprise a ceramic layer containing tungsten carbide, and the heat-generating intermediate portion comprises a ceramic layer containing titanium nitride.
Claim 16
Dependent Claim
91 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate is a sintered body of silicon nitride and the heat-generating resistor is a sintered ceramic layer comprising titanium nitride in an amount of 40 to 85% by weight, silicon nitride in an amount of 20 to 54% by weight and a sintering aid in an amount of 1 to 10% by weight.
Claim 17
Dependent Claim
91 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate is a sintered body of silicon nitride and the heat-generating resistor is a sintered ceramic layer comprising titanium nitride in an amount of 40 to 85% by weight, silicon nitride in an amount of 20 to 54% by weight and a sintering aid in an amount of 1 to 10% by weight.
Claim 18
Dependent Claim
24 words
A ceramic heater as set forth in claim 14, wherein the sintering aid is selected from the group consisting of yttria, magnesia and alumina.
Claim 19
Dependent Claim
116 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate is a sintered body of silicon nitride and the heat-generating resistor is a ceramic layer comprising titanium nitride and silicon carbide in an amount of 0.05 to 8% by weight based on titanium nitride, the sintered body has a chemical structure in which at least a part of SiC is solid-dissolved in the TiN lattice, and the sintered body has a density of at least 4.2 g/cm 3 and a specific resistance lower than 40 μΩ-cm.
Claim 20
Dependent Claim
116 words
A ceramic heater comprising a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both ends of the heat-generating resistor, wherein the ceramic substrate is a sintered body of silicon nitride and the heat-generating resistor is a ceramic layer comprising titanium nitride and silicon carbide in an amount of 0.05 to 8% by weight based on titanium nitride, the sintered body has a chemical structure in which at least a part of SiC is solid-dissolved in the TiN lattice, and the sintered body has a density of at least 4.2 g/cm 3 and a specific resistance lower than 40 μΩ-cm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |