US4640826A
Expired / Lapsed
US
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Method of making yttrium silicon oxy compound
Assignee: Ford Motor Co
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Filing: 1985-12-24
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Granted: 1987-02-03
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Expires: 2005-12-24
Abstract
Abstract A method is disclosed of making yttrium silicon oxy compounds, comprising: (a) mixing powdered hydrated metal nitrate with silica in molar equivalent amounts to yield upon heating a desired duo metal oxy compound; (b) agitatingly heating said mixture to melt and decomposition temperatures for the nitrate (e.g., 340°-370° C.), the melt encapsulating the silica particles; and (c) heating the sludge to a temperature (1300°-1550° C.) for a period of time (2-5 hours) effective to stimulate chemical reaction between the decomposed nitrate and silica to form yttrium silicon oxide.
Inventors
- 👤 Robert M. Williams
- 👤 Elaine C. Beckwith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:02
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
113 words
A method of making a duo metal oxy compound, comprising: (a) mixing a powdered hydrated nitrate of a metal selected from the group consisting of cerium and yttrium with silica in molar equivalent amounts to yield, upon heating, a dual oxide compound of silicon and said metal; (b) agitatingly heating said mixture to the melt and the decomposition temperature of the nitrate; and (c) heating said mixture resulting from step (b) to a temperature from 1300° to 1550° C. and for a period of time from 2 to 5 hours, and sufficient for the silica and decomposed metal nitrate to chemically react and form a dual oxide compound of silicon and said metal.
Claim 2
Independent Claim
113 words
A method of making a duo metal oxy compound, comprising: (a) mixing a powdered hydrated nitrate of a metal selected from the group consisting of cerium and yttrium with silica in molar equivalent amounts to yield, upon heating, a dual oxide compound of silicon and said metal; (b) agitatingly heating said mixture to the melt and the decomposition temperature of the nitrate; and (c) heating said mixture resulting from step (b) to a temperature from 1300° to 1550° C. and for a period of time from 2 to 5 hours, and sufficient for the silica and decomposed metal nitrate to chemically react and form a dual oxide compound of silicon and said metal.
Claim 3
Dependent Claim
14 words
The method as in claim 1, in which said metal nitrate is yttrium nitrate.
Claim 4
Dependent Claim
33 words
The method as in claim 2, in which said molar equivalent amounts for said nitrate and SiO 2 are in a ratio of 2:1 in order to form Y 2 SiO 5 .
Claim 5
Dependent Claim
32 words
The method as in claim 2, in which the molar equivalent amounts for said nitrate and silica are in a ratio of 1:1 to form Y 2 Si 2 O 7 .
Claim 6
Dependent Claim
52 words
The method as in claim 2, in which said heating of step (b) is carried out to the temperature range of 340°-370° C. for a period of 50-75 minutes in order to drive off water vapor and mixed nitrogen oxides from said nitrate thereby decomposing said nitrate and leaving a melted residue.
Claim 7
Dependent Claim
27 words
The method as in claim 5, in which said decomposed nitrate is YN a O b where a is 1-2 and b is 1, 2 or 4.
Claim 8
Dependent Claim
14 words
The method as in claim 1, in which the powder mixture is intimately mixed.
Claim 9
Dependent Claim
31 words
The method as in claim 1, in which said hydrated metal nitrate is selected from the group consisting of tri, tetra and hexahydrated yttrium nitrate, and tri and hexahydrated cerium nitrate.
Claim 10
Dependent Claim
25 words
The method as in claim 1, in which the heating in step (c) is under inert conditions and at a pressure just above atmospheric pressure.
Claim 11
Dependent Claim
18 words
The method as in claim 1, in which the reaction of step (c) is complete essentially to 90%.
References Cited (Backward Citations)
US2640756A
Cited
US4401617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |