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US 6,346,213 B1Granted
Press and sinter process for high density components
AssigneeStackpole Limited
InventorsRohith Shivanath, Karol Kucharski, Peter Jones
Life of this patent
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Abstract
A process of forming a sintered article of powder metal comprising blending graphite, Si carbide and lubricant, with pre-alloyed iron base powder; pressing said blended mixture to a shaped article; sintering said article in a reduced atmosphere; forced cooling said sintered article.
Claims7
Apparatus for producing sintered articles of powder metal comprising:
- (a) means for blending a mixture of Si carbide, lubricant and pre-alloyed iron based powder;
- (b) means for compacting said blended mixture to a shaped article;
- (c) ceramic tray means for carrying said shaped article;
- (d) means for preheating said shaped article to a temperature between 600° C. and 700° C.;
- (e) a furnace for sintering said preheated article at a sintering temperature between 1250° C. and 1350° C. in a reducing atmosphere;
- (f) means for transferring said sintered article to a transfer zone at approximately 980° C.;
- (g) a rapid cool chamber for receiving said sintered article from said transfer zone, said rapid cool chamber isolated from the atmosphere;
- (h) fan means associated with said rapid cool chamber for rapidly cooling said sintered article to approximately 300° C.;
- (i) means for removing said article from said ceramic tray means;
- (j) means to reheat said article to approximately 850° C. so as to slowly cool said article to room temperature.
7 more elements
Apparatus for producing sintered articles of powder metal comprising:
- (a) a furnace for sintering said powder metal articles at a sintering temperature between 1250° C. and 1350° C. in a reducing atmosphere;
- (b) a rapid cool chamber for receiving said sintered article, said rapid cool chamber, isolated by sealed door from the atmosphere;
- (c) fan means associated with sold rapid cool chamber for cooling said sintered powder metal by forced gas.
Apparatus for sintering a powder metal article comprising:
- (a) compacting powder metal to produce a shaped article;
- (b) ceramic trays for carrying said shaped powder metal article;
- (c) means for preheating said shaped powder metal article on said ceramic trays at a temperature between 600° C. and 700° C.;
- (d) a furnace for sintering said preheated shaped powder metal article on said ceramic trays at a temperature between 1250° C. and 1350° C.;
- (e) a chamber separated from said furnace, for receiving said sintered article, said chamber isolated from the atmosphere;
- (f) forced gas means associated with said chamber for rapidly cooling said sintered article to approximately 300° C.
3 more elements
Dependencies are inferred from the claim text.