| 摘要 |
An immersion probe (10) for determining a liquidus temperature of a molten metal sample during solidification has a first refractory body (14) with an immersion face (24), an interior sample chamber (26), and a passageway (30) between the immersion face (24) and an end wall (28) of the chamber (26). A heat sink (46) is positioned within the chamber (26) adjacent the end wall (28) and an insulating shield (50) is positioned within the chamber (26) adjacent the heat sink (46), each having an aperture corresponding to the inlet tube (36). The insulating shield (50) sinks thermal energy from within the chamber (26) at a second rate R2 slower than a first rate R1 of the interior walls of the chamber (26). A liquidus temperature sensor (56) is positioned within the chamber (26) away from the insulating shield (50). To determine the liquidus temperature, the probe (10) is immersed in the molten metal, and a molten metal sample flows into the chamber through the passageway (30). When the flow ceases, the heat sink (46) solidifies an adjacent portion of the molten metal and seals the sample within the chamber (26). The sealed sample solidifies along a solidification front that progresses toward the insulating shield (50). Accordingly, gaseous voids are prevented from being formed adjacent the sensor (56) while the liquidus temperature is determined.
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