Process for treating materials to improve their structural chara

Details Process for treating materials to improve their structural chara Process for treating materials to improve their structural chara

1984-01-03

1984-11-13

Capossela, Ronald C.

Heat exchange

Regenerator

Checker brick structure

62 64, 62 65, 148125, F25B 1300

Patent

active

044820054

ABSTRACT:
A process for treating a material to improve its structural characteristics comprises the steps of suspending the material closely above a cryogenic liquid for between about two hours and about four hours and, thereafter, completely immersing the material from its suspended position into the cryogenic liquid within about two seconds to about ten seconds. The rate of evaporation of the cryogenic liquid is then controlled so that the material is completely exposed to only gases within about five hours to about ten hours and, subsequently, the temperature of the material is controlled to rise from the cryogenic level to about -50.degree. F. within about eleven hours to about sixteen hours. After the material temperature reaches about -50.degree. F. within the specified time, the material is then allowed to return to ambient temperature of between about 65.degree. F. and about 70.degree. F. Thereafter, the material is heated to a temperature within the range of about 330.degree. F. to about 370.degree. F. for between about one hour and about five hours. When the heating step is finished, the material is allowed to return to its ambient temperature and the process is complete.

REFERENCES:
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patent: 3997376 (1976-12-01), Hembath
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