Shell investment molds embodying a metastable mullite phase in i

Details Shell investment molds embodying a metastable mullite phase in i Shell investment molds embodying a metastable mullite phase in i

1976-06-23

1980-02-12

Ansher, Harold

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

164165, 249134, 106 3822, 106 3827, 106 383, 106 389, 428331, 428401, 428404, 428472, 428539, B22C 1308, B28B 734, B28B 736

Patent

active

041884507

ABSTRACT:
Investment casting molds embodying a material comprising Al.sub.2 O.sub.3 flour with an average particle size less than 100 microns and silica binders exhibit superior physical properties at elevated temperatures up to about 1800.degree. C. The superior physical properties, including an excellent resistance to sag at about 1800.degree. C., are attributed to the formation of a metastable mullite phase. When the average particle size of Al.sub.2 O.sub.3 is less than the order of 10 microns, resistance to sag is present up to about 1900.degree. C.

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