Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles
Abstract
The method concerns forming a relatively stable slip of silicon metal particles and yttrium containing particles. In one embodiment, a casting slip of silicon metal particles is formed in water. Particles of a yttrium containing sintering aid are added to the casting slip. The yttrium containing sintering aid is a compound which has at least some solubility in water to form Y.sup.+3 ions which have a high potential for totally flocculating the silicon metal particles into a semiporous solid. A small amount of a fluoride salt is added to the casting slip which contains the yttrium containing sintering aid. The fluoride salt is one which will produce fluoride anions when dissolved in water. The small amount of the fluoride anions produced are effective to suppress the flocculation of the silicon metal particles by the Y.sup.+3 ions so that all particles remain in suspension in the casting slip and the casting slip has both an increased shelf life and can be used to cast articles having a relatively thick cross-section. The pH of the casting slip is maintained in a range from 7.5 to 9. Preferably, the fluoride salt used is one which is based on a monovalent cation such asmore »
- Inventors:
-
- Birmingham, MI
- Flat Rock, MI
- Issue Date:
- OSTI Identifier:
- 865158
- Patent Number(s):
- 4471060
- Assignee:
- Ford Motor Company (Dearborn, MI)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
- DOE Contract Number:
- P1928150
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- method; forming; relatively; stable; slip; silicon; metal; particles; yttrium; containing; concerns; embodiment; casting; formed; water; sintering; added; compound; solubility; form; potential; totally; flocculating; semiporous; solid; amount; fluoride; salt; contains; produce; anions; dissolved; produced; effective; suppress; flocculation; remain; suspension; increased; shelf; life; cast; articles; thick; cross-section; ph; maintained; range; preferably; based; monovalent; cation; sodium; ammonia; steps; adding; interchanged; desired; solution; prior; addition; metal particle; relatively thick; metal particles; solution containing; yttrium containing; fluoride salt; casting slip; silicon metal; shelf life; particles remain; containing particles; porous solid; relatively stable; stable slip; method concerns; cast article; monovalent cation; /501/264/
Citation Formats
Dickie, Ray A, and Mangels, John A. Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles. United States: N. p., 1984.
Web.
Dickie, Ray A, & Mangels, John A. Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles. United States.
Dickie, Ray A, and Mangels, John A. Sun .
"Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles". United States. https://www.osti.gov/servlets/purl/865158.
@article{osti_865158,
title = {Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles},
author = {Dickie, Ray A and Mangels, John A},
abstractNote = {The method concerns forming a relatively stable slip of silicon metal particles and yttrium containing particles. In one embodiment, a casting slip of silicon metal particles is formed in water. Particles of a yttrium containing sintering aid are added to the casting slip. The yttrium containing sintering aid is a compound which has at least some solubility in water to form Y.sup.+3 ions which have a high potential for totally flocculating the silicon metal particles into a semiporous solid. A small amount of a fluoride salt is added to the casting slip which contains the yttrium containing sintering aid. The fluoride salt is one which will produce fluoride anions when dissolved in water. The small amount of the fluoride anions produced are effective to suppress the flocculation of the silicon metal particles by the Y.sup.+3 ions so that all particles remain in suspension in the casting slip and the casting slip has both an increased shelf life and can be used to cast articles having a relatively thick cross-section. The pH of the casting slip is maintained in a range from 7.5 to 9. Preferably, the fluoride salt used is one which is based on a monovalent cation such as sodium or ammonia. The steps of adding the yttrium containing sintering aid and the fluoride salt may be interchanged if desired, and the salt may be added to a solution containing the sintering aid prior to addition of the silicon metal particles.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}