Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – To remove entrained material from article
Patent
1990-05-14
1991-06-04
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
To remove entrained material from article
264 63, 419 37, 419 65, C04B 3806
Patent
active
050212087
ABSTRACT:
A method for removing a paraffin wax based binder containing a fatty acid from a green article, wherein the article is made of material selected from the group consisting of ceramic powders and metallic powders, which comprises heating the article in a non-oxidizing atmosphere in a furnace by raising the temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a first temperature of about 50.degree. C. to 80.degree. C. and thereafter maintaining the first temperature for about 30 to 90 minutes to essentially completely melt the binder, raising the temperature from the first temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a second temperature of about 200.degree. C. to 225.degree. C. and thereafter maintaining the second temperature for about 30 to 90 minutes to essentially completely vaporize the paraffin wax, raising the temperature from the second temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a third temperature of about 260.degree. C. to 300.degree. C. and thereafter maintaining the third temperature for about 30 to 90 minutes to essentially completely vaporize the fatty acid, and raising the temperature from the third temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a fourth temperature of about 430.degree. C. to 480.degree. C. and thereafter maintaining the fourth temperature for about 30 to 90 minutes to insure complete vaporization of essentially all of the binder.
REFERENCES:
patent: 4708838 (1987-11-01), Bandyopadhyay
patent: 4713206 (1987-12-01), Matsuhisa
Ludwig David C.
Penkunas Joseph J.
Derrington James
GTE Products Corporation
Walter Robert E.
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