Patent US4332909A successfully refreshed from Google Patents.
US4332909A
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US
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Silicon nitride based sintered product and method of producing the same
Assignee: Toshiba Corp
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Filing: 1980-08-25
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Granted: 1982-06-01
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Expires: 2000-08-25
Abstract
Abstract A silicon nitride based sintered product produced by sintering a powder mixture consisting essentially of silicon nitride, at least one oxide of yttrium, scandium, cerium, lanthanum and the metals of lanthanide series and at least one metal or metal oxide of iron, nickel and cobalt.
Inventors
- 👤 Katsutoshi Nishida
- 👤 Toshihiko Ochiai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/593; C04B35/597
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
60 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt.
Claim 2
Dependent Claim
60 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt.
Claim 3
Dependent Claim
28 words
The composition of claim 1, wherein the oxides of yttrium, scandium, cerium, lanthanum and the metals of lanthanide series are present in from 1 to 5 weight parts.
Claim 4
Dependent Claim
25 words
The composition of claim 1 or 2, wherein the metal oxide of iron, nickel and cobalt is present in from 2 to 50 volume parts.
Claim 5
Dependent Claim
96 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the metal oxide of iron, nickel and cobalt is replaced by at least one metal or metal oxide of molybdenum, tungsten, chromium and manganese, in the amount of up to 20 percent by weight.
Claim 6
Dependent Claim
96 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the metal oxide of iron, nickel and cobalt is replaced by at least one metal or metal oxide of molybdenum, tungsten, chromium and manganese, in the amount of up to 20 percent by weight.
Claim 7
Dependent Claim
82 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the silicon nitride is replaced by chemcially stable refractory compound, in the amount of less than 50 percent by volume.
Claim 8
Dependent Claim
82 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the silicon nitride is replaced by chemcially stable refractory compound, in the amount of less than 50 percent by volume.
Claim 9
Dependent Claim
35 words
The composition of claim 5, wherein the chemically stable refractory compound is at least one of aluminum nitride, titanium nitride, zirconium nitride, titanium carbide, zirconium carbide, silicon carbide, chromium silicide, tungsten silicide and molybdenum silicide.
Claim 10
Dependent Claim
80 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt; and a sintering aid in the amount of less than 10 weight parts per 100 weight parts of silicon nitride.
Claim 11
Dependent Claim
80 words
A composition consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt; and a sintering aid in the amount of less than 10 weight parts per 100 weight parts of silicon nitride.
Claim 12
Dependent Claim
27 words
The composition of claim 7, wherein the sintering aid is at least one of aluminum oxide, magnesium oxide, silica, boron oxide, lithium oxide and the oxide spinels.
Claim 13
Dependent Claim
69 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt.
Claim 14
Dependent Claim
69 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt.
Claim 15
Dependent Claim
29 words
The sintered product of claim 1, wherein the oxides of yttrium, scandium, cerium, lanthanum and the metals of lanthanide series are present in from 1 to 5 weight parts.
Claim 16
Dependent Claim
26 words
The sintered product of claim 9 or 10, wherein the metal oxide of iron, nickel and cobalt is present in from 2 to 50 volume parts.
Claim 17
Dependent Claim
105 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the metal oxide of iron, nickel and cobalt is replaced by at least one metal or metal oxide of molybdenum, tungsten, chromium and manganese, in the amount of up to 20 percent by weight.
Claim 18
Dependent Claim
105 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the metal oxide of iron, nickel and cobalt is replaced by at least one metal or metal oxide of molybdenum, tungsten, chromium and manganese, in the amount of up to 20 percent by weight.
Claim 19
Dependent Claim
91 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the silicon nitride is replaced by chemically stable refractory compound, in the amount of less than 50 percent by volume.
Claim 20
Dependent Claim
91 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; and 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt, wherein the silicon nitride is replaced by chemically stable refractory compound, in the amount of less than 50 percent by volume.
Claim 21
Dependent Claim
36 words
The sintered product of claim 13, wherein the chemically stable refractory compound is at least one of aluminum nitride, titanium nitride, zirconium nitride, titanium carbide, zirconium carbide, silicon carbide, chromium silicide, tungsten silicide and molybdenum silicide.
Claim 22
Dependent Claim
89 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt; and a sintering aid in the amount of less than 10 weight parts per 100 weight parts of silicon nitride.
Claim 23
Dependent Claim
89 words
A sintered product which is produced by sintering a powder mixture consisting essentially of silicon nitride, 0.02 to 10 weight parts per 100 weight parts of silicon nitride of at least one oxide of yttrium, scandium, cerium, lanthanum and the metal oxides of the lanthanide series; 1 to 100 volume parts per 100 volume parts of silicon nitride of at least one metal oxide of iron, nickel and cobalt; and a sintering aid in the amount of less than 10 weight parts per 100 weight parts of silicon nitride.
Claim 24
Dependent Claim
28 words
The sintered product of claim 15, wherein the sintering aid is at least one of aluminum oxide, magnesium oxide, silica, boron oxide, lithium oxide and the oxide spinels.
Claim 25
Dependent Claim
17 words
The sintered product of claim 9, wherein the sintering temperature is from 1400° C. to 1900° C.
Claim 26
Dependent Claim
17 words
The sintered product of claim 9, wherein the sintering temperature is from 1500° C. to 1800° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |