Comparison of high-frequency and electric heating fusion machines
Release time:
2021-03-04
In X-ray fluorescence spectrometry, the glass fusion method for sample preparation completely eliminates the mineral and particle size effects of the sample. After the sample is diluted by the flux, it can also reduce the matrix effect caused by coexisting elements to a certain extent. Since its discovery in 1956, this technology has gradually developed and matured over the years and is now used by a large number of laboratories worldwide, becoming one of the two major sample preparation methods in X-ray fluorescence spectrometry.
High-frequency induction heating Fusion machine The principle is that the high-frequency current generates a magnetic field through the coil, causing the crucible to generate Joule heat due to its own resistance. This allows the crucible itself to heat up and achieve the purpose of melting.
The principle of the resistance radiation heating type fusion machine is to use nickel-chromium-molybdenum resistance wires, silicon carbide rods, or silicon molybdenum rods to achieve melting by electric thermal radiation heating.
Due to high frequency Fusion machine Currently, relatively less is used, and there are several misunderstandings in current understanding. We will compare it with electric heating fusion machines for corresponding explanations:
1. Temperature control accuracy cannot meet the requirements: Compared with electric heating fusion machines, high-frequency fusion machines are indeed not advantageous in terms of temperature control accuracy. However, with the application of infrared temperature measurement, it is no longer necessary to use the old-fashioned contact temperature measurement, and the temperature control accuracy is getting higher and higher. In particular, the Ruishenbao FHC-00 high-frequency fusion machine has achieved ±1℃, which can meet the daily sample preparation needs in the case of actual melting temperatures generally above 1000 degrees.
2. Inconsistent temperature at each workstation: This is because some manufacturers' high-frequency Fusion machine Referencing the heating and temperature control systems of electric heating fusion machines all use a series connection method, resulting in inaccurate measurement of the temperature at each workstation.
3. Not suitable for large-scale sample preparation: This is because multiple workstations may cause inconsistent high-frequency melting temperatures at both ends. Existing high-frequency melting is mostly two workstations, which is less efficient than the four or even six workstations of electric heating melting machines. However, solving the problem of workstation temperature control also solves this problem.
4. Crucible is easily damaged: The statement that high-frequency heating crucibles are easily damaged is incorrect. In fact, crucible damage is mainly caused by corrosion by oxidizing substances in the sample. You can familiarize yourself with the sample properties in advance and use pre-oxidation to reduce the damage of oxides. At the same time, the Ruishenbao FHC-00 high-frequency fusion machine uses a casting method to protect the crucible as much as possible.
5. Support frame shedding: Shedding is mainly caused by the oxidation of the alloy support frame. However, compared with the electric heating, the Ruishenbao FHC-00 high-frequency fusion machine currently uses high-temperature ceramics to replace high-temperature alloys as the support frame, which can completely avoid the situation of alloy support frame oxidation and shedding contaminating the sample.
6. Requires external circulating water: Compared with electric heating Fusion machine High-frequency melting requires matching circulating water. However, a special small water cooler can be used, and pure water can be added once for long-term use, eliminating the need for external circulating water.
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