Tungsten Copper Melting Point Test
Melting solid organic solid-liquid state at atmospheric pressure to reach equilibrium temperature, pure solid organic compounds generally have a fixed melting point change between solid and liquid states, is very keen, since the beginning of melting to full penetration (called the melting range) temperature does not exceed 0.5-1 ℃.
Tungsten Copper Melting Test Procedure1. Preparation melting point tubes
Capillary diameter is generally 1-2 mm, 50-70 mm long. Closed at one end by capillary low heat until the closed for end of the inner diameter of the capillary with two thin lines intersect or no capillarity.
2, Sample Loaded
Take a small amount of sample is placed on a clean plate into powder. Insert one end of the capillary openings powder, and then the opening end up on the table and gently tap the powder fall into the bottom of the tube. The capillary tube containing the sample can repeatedly through a long glass tube, free fall, which would also allow the sample is uniformly fall into bottom of the tube. Sample height of about 2-3 mm. Samples must fall into the bottom of the tube evenly, otherwise difficult to heat, affect the measurement results. The use of heat transfer fluid can be pasted beside capillary thermometer in the middle position of the sample shall mercury bulb thermometer.
3, Melting Point Determination
The melting point measurement operation key is slowly heated over low heat in order to rise 3-4oC per minute until the temperature rises and the expected melting point difference of about l5oC, weakened heated by the flame, so that the temperature rise rate per minute to about l-2oC appropriate. You should pay particular attention to the case of temperature rise and capillary samples. Begin recording when capillary samples tread off and have liquid generated when the (initial melting) and the solid was completely disappeared (full melting) temperature, namely the melting point of the sample.
Tungsten Copper Melting Test Keys and Notes1, Drawn capillary tube must rotate evenly heated, and pay attention to the ends of the closure to prevent affect the determination.
2, The sample must be closely packed solid, height of about 2-3mm.
3, When the melting point determination, pay attention to the thermometer mercury ball located between the upper and lower jaw b-tube.
4, Heating rate control, and record the sample melting point range.
5. Determination of trace heating boiling point should be noted that not too fast, not too liquid to be measured, to prevent all the liquid vaporization. Determine when to sample the boiling point, and properly recorded.
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