The high-frequency vibration test bench differential thermal analysis method is an important thermal analysis method, which refers to a test technique for measuring the relationship between temperature difference and temperature or time of a substance and a reference substance under program temperature control. A general differential thermal analysis device is composed of a heating system, a temperature control system, a signal amplification system, a differential thermal system, and a recording system.
The high-frequency vibration test bench differential thermal analysis operation is simple, but in actual work, it is often found that the same sample is measured on different instruments, or different people are measured on the same instrument, and the obtained differential thermal curve results are different. The peak temperature, shape, area, and peak size will vary. The main reason is that heat is caused by many factors and the heat transfer is complicated. Generally speaking, one is the instrument and the other is the sample. Although there are many influencing factors, as long as certain conditions are strictly controlled, good reproducibility can still be obtained.
To understand the key factors and choices that affect the differential thermal analysis of high-frequency vibration test benches, let us briefly talk about what is differential thermal analysis.
1. Selection of atmosphere and pressure: Atmosphere and pressure can affect the equilibrium temperature and peak shape of the chemical reaction and physical change of the sample.
2. Influence and selection of heating rate: The heating rate not only affects the position of the peak temperature, but also affects the size of the peak area. Generally speaking, at a faster heating rate, the peak area becomes larger and the peak becomes sharper.
3. Pretreatment and dosage of the sample: The large amount of the sample makes it easy to overlap the adjacent two peaks and reduce the resolution.
4. Selection of reference materials: To obtain a smooth baseline, the choice of reference is important.
5. Choice of paper speed: Under the same experimental conditions, the same sample has a fast paper feeding speed and a large peak area, but the shape of the peak is flat and the error is small; the paper feeding rate is small and the peak area is small.
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