Experimental furnace heating wire classification

Including iron-chromium alloy heating wire and nickel-chromium alloy heating wire into two categories. The former is a ferritic alloy tissue, which are austenitic alloys. In addition, there are some special purposes such as tungsten filament heating alloy wire, molybdenum wire and other laboratory furnace according to different purposes, to different temperatures, choose a different electric wire.
Laboratory furnace with electric wire electric iron chrome aluminum alloy material is characterized by:
1. Use of high temperature, such as HRE iron-chromium alloy wire in the atmosphere maximum temperature up to 1400 ℃, which is the laboratory furnace maximum temperature can reach 1,400 degrees, if you need to design more than this temperature laboratory furnace, you need to select another The electric wire;
(2) long life;
3 Allow the surface of the load is large;
4 good oxidation resistance, and its oxidation to generate AI2O3 film has good chemical resistance and high electrical resistivity, specific gravity less than nickel-chromium alloy, high resistivity.
5 sulfur resistance is good;
6 prices significantly lower than nickel-chromium alloy;
7 disadvantage is that as the temperature increases, the performance of plastic, high temperature strength is low.
Laboratory furnace nickel-chromium heating wire is characterized by:
1, high strength at high temperatures;
(2) long-term use and then cooled down, the material does not become brittle;
3 fully oxidized nickel alloy ming the radiation rate ratio Fe-Cr alloy high;
4 non-magnetic;
5 In addition to the atmosphere of sulfur, the better corrosion resistance.
Laboratory furnace alloy heating wire shortcomings
Alloy heating wire is the most widely used, the largest amount of heating materials. Its disadvantage is its working state is very high temperatures (hot state), prone to oxidation in air blown reaction; electrothermal energy conversion aspects from analysis due to energy loss leaving visible light generating section; electric wire is often Use a spiral state, power is generated when inductance effects.