Method for producing silicon nitride molded bodies by means of p

Details Method for producing silicon nitride molded bodies by means of p Method for producing silicon nitride molded bodies by means of p

1979-03-19

1981-04-28

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 85, 264 86, 264332, C04B 3558, F27B 904, F27B 910

Patent

active

042645468

ABSTRACT:
Method and apparatus for producing silicon nitride molded bodies by means of a pseudoisostatic hot pressing process. Silicon nitride is initially ground in a grinding vessel with grinding elements wherein the vessel is lined with the same material from which the grinding elements are made, e.g., hot pressed silicon nitride. Grinding is continued until a specific surface area greater than 15 m.sup.2 is obtained. The grinding takes place in the presence of a grinding liquid to prevent oxidation of the freshly ground silicon nitride. The silicon nitride suspension is then treated in a pressure vessel to remove the grinding liquid therefrom and form a blank. The blank is thereafter embedded within a pressure transfer medium, e.g., boron nitride, and inserted into the die of a hot pressing furnace to obtain the desired hot pressed silicon nitride.
The pressure vessel used in this method comprises a chamber for the silicon nitride suspension, an outlet means connected to the bottom of the chamber to permit the vacuum removal of the grinding fluid from said suspension; and an inlet means connected to the chamber for admitting an inert gas, e.g., nitrogen, into the chamber.

REFERENCES:
patent: 4036653 (1977-07-01), Jacobson
patent: 4112143 (1978-09-01), Adlerborn et al.
patent: 4119690 (1978-10-01), Prochazka et al.
patent: 4126653 (1978-11-01), Smith et al.
patent: 4127630 (1978-11-01), Washburn

Affiliated with

Also associated with

Rating

Method for producing silicon nitride molded bodies by means of p does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for producing silicon nitride molded bodies by means of p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing silicon nitride molded bodies by means of p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-863694