Below the melting point electrical resistivity for each alloy was fitted, using the least squares method, to a linear function in temperature. However, in the case of the alloy 80 Nb–10 Ta–10 W ( figure 6) the change in the electrical resistivity was gradual, starting approximately 15 K below the melting point. The results indicate that electrical resistivity of the alloys 90 Ta–10 W ( figure 4) and 99 Nb–1 Zr ( figure 5) changed almost abruptly at the start of melting. The values for the 100 K range below the melting points are given in table 4. The results for the electrical resistivity of the alloys near and at their respective melting points are shown in figures 4, ,5, 5, and and6. The dimensions were based on their room temperature values the cross-sectional area was determined from the measurement of weight and density. The results of radiance temperature at the melting point of the alloys and corresponding values for the normal spectral emittance are given in table 3.Įlectrical resistivity of the tubular specimens was calculated using the relation ρ = RA/L, where R is the resistance, A the cross-sectional area, and L the length of the specimen between the potential probes. However, 80 Nb–10 Ta–10 W results ( figure 3) do not indicate the existence of any well-defined plateau, with the exception of a short segment immediately after reaching the melting point. It may be seen ( figure 2) that both 90 Ta–10 W and 99 Nb–1 Zr samples behaved normally, that is, radiance temperature increased and exhibited a plateau upon melting. Similar results for the alloy 80 Nb–10 Ta–10 W are shown in figure 3. The experimental results of the radiance temperature of 90 Ta–10 W and 99 Nb–1 Zr alloys near and at the respective melting points are shown in figure 2. The circular area viewed by the pyrometer was 0.2 mm in diameter. The measurements were performed at 650 nm which corresponds to the effective wavelength of the pyrometer’s interference filter. Steve Bebich liked Travel Case Cyberdeck.Where ϵ is the normal spectral emittance, T m the melting point, T s the radiance temperature, c 2 the second radiation constant (1.4388 × 10 −2 m K), and λ the effective wavelength of the optical system.Addison Woods wrote a comment on The "Cyclone-Rotor" Drone.
#MELTING POINT MEASURE MOVIE#
Lr0dy on Iron Nitrides: Powerful Magnets Without The Rare Earth Elements.Posted in chemistry hacks, Tool Hacks Tagged heating element, hot glue gun, melting point, thermocouple, thermometer Post navigation
The rotary light dimmer feeds the electricity to the element, allowing for adjustments to the ramping speed. He wrapped it in fiberglass fabric which is sold in the plumbing supply to protect the area around pipe joints during soldering. Inside the PVC pipe is the heating element from a 40W hot glue gun. That melting surface is the hexagonal head of a bolt which he drilled out to provide a concave surface for the test compound. In this image he’s using a thermocouple to monitor the temperature of the melting surface, but mentions that you can do this with an inexpensive dial thermometer and will still have great results.
#MELTING POINT MEASURE HOW TO#
figured out how to get around the $500 price tag of a commercial unit by building this DIY melting point test apparatus. This is especially true with hobby chemists as they often acquire their raw materials from the hardware store, garden center, or pool supply. When working with chemical reactions it may be necessary to test the purity of the components you’re using.
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