US4059453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making molds for the casting of metals
Assignee: Dynamit Nobel AG
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Filing: 1976-05-12
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Granted: 1977-11-22
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Expires: 1996-05-12
Abstract
Abstract An improvement in a process for making a mold for metal casting by applying a fluid ceramic composition containing binding agent and finely divided refractory substance to a pattern and hardening the same, which improvement comprises employing a ceramic composition which contains special solvents, anti-setting and thixotropic agents, so that this composition after applying gives a uniform coat which does not run down from walls.
Inventors
- 👤 Werner Dittrich
- 👤 Friedhelm Schnippering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:01
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/04; B22C1/00; B22C1/16; B22C1/165; B22C1/20; B22C1/205
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
166 words
In a process for making a multilayer mold comprising applying to a foundry mold form a first ceramic composition containing a refractory aggregate and a binder selected from the group consisting of an alcoholate of titanium, aluminum or zirconium and an alkyl silicate, hardening said first ceramic composition on said mold form to form a first layer and adding onto said first layer before said first layer has fully hardened a second ceramic composition in the form of a supportive backfill and hardening said second ceramic composition, the improvement comprising as said first ceramic composition, A. a first refractory material of grain size 100 to 200 (Tyler) mesh and a second refractory material of 14 to 32 (Tyler) mesh, the volumetric ratio of said first refractory material being 1-2 : 1 and; B. an anti-settling agent in an amount between 0.1 and 10 weight percent, said anti-settling agent selected from the group consisting of montmorillonite, bentonite, pyrogenic silica, asbestos flour, asbestos filaments, ethylcellulose, talc and mica.
Claim 2
Dependent Claim
166 words
In a process for making a multilayer mold comprising applying to a foundry mold form a first ceramic composition containing a refractory aggregate and a binder selected from the group consisting of an alcoholate of titanium, aluminum or zirconium and an alkyl silicate, hardening said first ceramic composition on said mold form to form a first layer and adding onto said first layer before said first layer has fully hardened a second ceramic composition in the form of a supportive backfill and hardening said second ceramic composition, the improvement comprising as said first ceramic composition, A. a first refractory material of grain size 100 to 200 (Tyler) mesh and a second refractory material of 14 to 32 (Tyler) mesh, the volumetric ratio of said first refractory material being 1-2 : 1 and; B. an anti-settling agent in an amount between 0.1 and 10 weight percent, said anti-settling agent selected from the group consisting of montmorillonite, bentonite, pyrogenic silica, asbestos flour, asbestos filaments, ethylcellulose, talc and mica.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein said first ceramic composition is fluid and contains a solvent for said binder.
Claim 4
Dependent Claim
19 words
A process according to claim 2 wherein said solvent is an alcohol having a boiling point above 120° C.
Claim 5
Dependent Claim
23 words
A process according to claim 2 wherein said solvent is selected from the group consisting of ethylene glycol monomethyl ether and diacetone alcohol.
Claim 6
Dependent Claim
37 words
A process according to claim 3 wherein the refractory aggregate of said first ceramic composition is selected from the group consisting of aluminum oxide, silicon dioxide, zirconium oxide, mullite, zirconium silicate, sillimanite, chromium-containing sand and quartz sand.
Claim 7
Dependent Claim
32 words
A process according to claim 5 wherein said first ceramic composition contains 5-50 weight percent of said binder, 50-95 weight percent of said refractory aggregate and 5-50 weight percent of said solvent.
Claim 8
Dependent Claim
27 words
A process according to claim 6 wherein said anti-settling agent is present in said first ceramic composition in an amount of between 0.5 and 2 weight percent.
Claim 9
Dependent Claim
42 words
A process according to claim 7 wherein said binder is present in an amount of 20-30 weight percent, said refractory material is present in an amount of 70-90 weight percent and said solvent is present in an amount of 10-20 weight percent.
Claim 10
Dependent Claim
17 words
A process according to claim 1 wherein said second ceramic composition comprises water glass and quartz sand.
Claim 11
Dependent Claim
16 words
A process according to claim 1 wherein said second ceramic composition comprises water glass and grog.
Claim 12
Dependent Claim
19 words
A process according to claim 1 wherein said second ceramic composition is hardened by applying carbon dioxide gas thereto.
Claim 13
Dependent Claim
19 words
A process according to claim 6, wherein said first ceramic composition contains a primary, secondary or tertiary hardening agent.
Claim 14
Dependent Claim
28 words
A process according to claim 1 wherein said binder is a partially condensed alkyl silicate whose alkyl radicals have between 1 and 8 carbon atoms in the chain.
Claim 15
Dependent Claim
21 words
A process according to claim 12 wherein said binder has an SiO 2 content of between 8 and 35% by weight.
Claim 16
Dependent Claim
22 words
A process according to claim 13 wherein said binder has an SiO 2 content of between 18 and 25 percent by weight.
Claim 17
Dependent Claim
17 words
A process according to claim 1 wherein said first layer is hardened by an aqueous ammonia solution.
Claim 18
Dependent Claim
20 words
A process according to claim 1 wherein said anti-settling agent is a montmorillonite or bentonite swollen with an organic solvent.
Claim 19
Dependent Claim
20 words
A process according to claim 1 wherein said anti-settling agent is montmorillonite swollen with a mixture of xylene and ethanol.
Claim 20
Dependent Claim
22 words
A process according to claim 1 wherein prior to the time said first layer has fully hardened there is applied thereto sand.
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) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |