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US 5,209,885 AGranted
Aqueous extrusion of silicon nitride
AssigneeW. R. Grace & Co.-Conn.
InventorsTariq Quadir, Ahmad Arfaei
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Abstract
A water-based silicon nitride powder extrusion mixture is prepared. The mixture also contains oleic acid, glycerin, methyl cellulose and a polyacrylic acid-containing polymer. The mixture can be extruded at ambient temperatures. The extrudate can be dried at low temperature and sintered to form a dense silicon nitride part.
Claims17
A method of extruding a silicon nitride powder mixture, said method comprising:
- a) mixing polyacrylic acid-containing polymer, water, glycerin and oleic acid to form an aqueous solution;
- b) mixing silicon nitride powder with methyl cellulose to form a powder mixture;
- c) combining said solution and said powder mixture to form an extrusion mixture;
- and
- d) extruding said extrusion mixture to form an extrudate.
2 more elements
A method of forming a sintered silicon nitride body, said method comprising:
- a) mixing polyacrylic acid-containing polymer, water, glycerin and oleic acid to form an aqueous solution;
- b) mixing silicon nitride powder with methyl cellulose to form a powder mixture;
- c) combining said solution and said powder mixture to form an extrusion mixture;
- and
- d) extruding said extrusion mixture to form an extrudate.
- e) drying said extrudate.
- f) sintering said dried and extrudate to form a dense silicon nitride body.
4 more elements
Dependencies are inferred from the claim text.