US4483944A
Expired / Lapsed
US
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Aluminum titanate-mullite ceramic articles
Assignee: Corning Glass Works
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Filing: 1983-07-27
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Granted: 1984-11-20
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Expires: 2003-07-27
Abstract
Abstract This invention is directed to the production of sintered ceramic articles wherein aluminum titanate and mullite constitute the predominant crystal phases and wherein the microstructure thereof evidences grain boundary and intracrystalline microcracking. The articles have base compositions encompassed within the area I, J, K, L, M, I of the drawing to which 0.5-5% Fe 2 O 3 and/or 0.5-5% rare earth metal oxide may be added.
Inventors
- 👤 John P. Day
- 👤 Irwin M. Lachman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:50
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12; B01J23/00; B01J23/70; B01J23/76; B01J23/83; C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/46; C04B35/462; C04B35/478; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A sintered ceramic article containing aluminum titanate and mullite as the predominant crystal phases and which is characterized by grain boundary and intracrystalline microcracking, said article exhibiting high refractoriness, excellent thermal shock resistance, a coefficient of thermal expansion (R.T.-1000° C) less than 25×10 -7 /°C. when sintered at temperatures of 1400° C. and higher, a modulus of rupture greater than 2500 psi when sintered at 1400° C. and greater than 5000 psi when sintered at 1500° C., and having a composition bounded by Points I, J, K, L, M, I of the drawing.
Claim 2
Dependent Claim
93 words
A sintered ceramic article containing aluminum titanate and mullite as the predominant crystal phases and which is characterized by grain boundary and intracrystalline microcracking, said article exhibiting high refractoriness, excellent thermal shock resistance, a coefficient of thermal expansion (R.T.-1000° C) less than 25×10 -7 /°C. when sintered at temperatures of 1400° C. and higher, a modulus of rupture greater than 2500 psi when sintered at 1400° C. and greater than 5000 psi when sintered at 1500° C., and having a composition bounded by Points I, J, K, L, M, I of the drawing.
Claim 3
Dependent Claim
28 words
A sintered ceramic article according to claim 1 also containing in weight percent 0.5-5% Fe 2 O 3 and/or 0.5-5% of at least one rare earth metal oxide.
Claim 4
Dependent Claim
30 words
A sintered ceramic article according to claim 2 wherein said rare earth metal oxide is selected from the group of La 2 O 3 and Nd 2 O 3 .
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |