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Title: 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 » 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.« less

Inventors:
 [1];  [2]
  1. (Birmingham, MI)
  2. (Flat Rock, MI)
Issue Date:
OSTI Identifier:
865158
Patent Number(s):
4471060
Assignee:
Ford Motor Company (Dearborn, MI) OSTI
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 = {1984},
month = {1}
}

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