Molybdenum disilicide ceramic composite infrared radiation sourc

Details Molybdenum disilicide ceramic composite infrared radiation sourc Molybdenum disilicide ceramic composite infrared radiation sourc

1997-09-26

1999-12-28

Walberg, Teresa

Electric heating

Heating devices

With heating unit structure

219270, 219464, H05B 310

Patent

active

060084790

ABSTRACT:
In an infrared radiation source containing hot-pressed molybdenum disilicide reinforced with silicon carbide whiskers as the illuminant thereof, terminal portions of the illuminant having a protective dense silica film of 5 to 20 .mu.m in thickness formed on the surface thereof which portions are to be heated at a temperature of 400 to 800.degree. C. are either set to have a current density of at most 12 A/mm.sup.2 or disposed in dry air having a relative humidity at 25.degree. C. of at most 30% (absolute humidity: 0.00588). As a result, the low-temperature oxidation phenomenon that would otherwise be developed in the terminal portions of the illuminant is suppressed. Thus, there can be obtained an infrared radiation source containing an illuminant made of molybdenum disilicide reinforced with silicon carbide whiskers and having a long serviceable life span.

REFERENCES:
patent: 4433233 (1984-02-01), Hierholzer, Jr. et al.
patent: 5338616 (1994-08-01), Ishii et al.
patent: 5591368 (1997-01-01), Fleischhauer et al.

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