Classification of heating elements: (by temperature)
1, iron base alloy (iron chromium aluminum, iron chromium molybdenum) 1000-1200℃
2, silicon carbon rod 1300-1400℃
3, silicon molybdenum rod 1600-1700℃
4, molybdenum 1800℃
5, tungsten 2000-2500℃ (vacuum, atmosphere conditions)
6, graphite above 2600℃ (vacuum, atmosphere conditions)
Heater:
1, iron chromium aluminum (FeCrAl) resistance wire
(1) High use temperature, the highest use temperature in the air: 1000-1200 ℃.
(2) The resistivity is large, and the resistance temperature coefficient is small.
(3) The surface load is slightly higher than the NiCr wire.
(4) Good oxidation resistance and corrosion resistance, low price.
2, silicon carbon rod (SiC)
(1) The normal use temperature in the oxidizing atmosphere can reach 1450℃, and the continuous use can reach 2000 hours.
(2) The continuous service life of the silicon carbon rod is long, and the intermittent service life is short
(3) The maximum use temperature can not exceed 1450°C, the use temperature exceeds this value silicon carbon rod will quickly aging,
Service life will be seriously affected
3, silicon molybdenum rod
(1) The maximum temperature can reach 1800°C, and the applicable operating temperature is 500-1700°C
(2) Made on the basis of molybdenum disilicide, high temperature resistance, oxidation resistance
(3) When used in a high temperature oxidizing atmosphere, a layer of bright and dense quartz (SiO2) glass film is generated on the surface, which can protect the inner layer of silicon molybdenum rod from oxidation, so the silicon molybdenum rod element has a unique high temperature oxidation resistance.
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