Method of manufacturing low thermal expansion modified cordierit

Details Method of manufacturing low thermal expansion modified cordierit Method of manufacturing low thermal expansion modified cordierit

1984-07-20

1986-05-06

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 264570, 501119, B32B 904

Patent

active

045870675

ABSTRACT:
The present invention is directed to a method of manufacturing low thermal expansion modified cordierite compositions which are especially useful in the manufacture of mirrors for high temperature applications, said method comprising the steps of: providing, on a molecular basis, a mixture of about 2 moles magnesium oxide, 2 moles aluminum oxide, and about 5 moles divided between silicon dioxide and germanium oxide; blending said materials; milling the mixture until finely divided and thoroughly mixed; forming said mixture into a desired shape; gradually heating the shape to a temperature at which reactive sintering occurs and a cordierite type structure is formed; gradually cooling the structure; and hot compacting the structure to consolidate the sintered body to very nearly 100 percent of theoretical density.

REFERENCES:
patent: 4296065 (1981-10-01), Ishii et al.
patent: 4403017 (1983-09-01), Bind
Kobe Steel, Hot Isostatic Press, No. 428090, printed in Japan.

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