Process for removing polyacetal binder from molded ceramic green

Details Process for removing polyacetal binder from molded ceramic green Process for removing polyacetal binder from molded ceramic green

1989-11-13

1992-01-14

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

264 63, 26421111, 2643282, 264344, 419 36, 419 38, 419 41, 419 44, 419 65, C04B 3302

Patent

active

050808460

ABSTRACT:
A polyacetal binder is removed from an extruded or injection molded ceramic green body in less than 25 hours by a variable heating rate schedule in which the heating rate is reduced when the temperature of the green body reaches the point at which isothermal degradation of the polyacetal binder can take place and wherein at least 80 wt. % of the binder can be removed. In air, the isothermal removal of the binder can take place within the range of 160.degree.-220.degree. C. while in nitrogen the range is from about 300.degree.-360.degree. C.

REFERENCES:
patent: 4624812 (1986-11-01), Farrow et al.
patent: 4664883 (1987-05-01), Melody et al.
patent: 4784812 (1988-11-01), Saitoh et al.
patent: 4795598 (1989-01-01), Billiet

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