Puxi horizontal platform graphite tubeThe atomization mechanism is the process of generating high temperatures (up to 3000 degrees Celsius) through the heating of graphite tubes by high currents. At such high temperatures, graphite tubes undergo significant changes in both their chemical and physical properties. For example, their chemical properties become more reactive, making them more prone to chemical reactions that are not easily occurring at room temperature, as well as physical conductivity, thermal expansion, and other factors that can affect the lifespan of graphite tubes.
1. The installation of graphite cones (rings) is unreasonable or damaged.
The graphite tube is sandwiched between two graphite cones. When the graphite cones are installed improperly, the force at both ends of the graphite tube is not the same or not in a straight line, which can lead to inconsistent thermal expansion and edge damage of the graphite tube. At this point, it may be a direct fracture.
2. Sample medium
Due to the reducibility of graphite materials, solutions react with oxidizing substances. When we measure samples, commonly used acids such as perchlorate, sulfuric acid, and hydrochloric acid are corrosive to graphite tubes, especially perchloric acid and sulfuric acid. Due to their high boiling points, they concentrate during the drying and ashing stages, resulting in stronger oxidation and more severe corrosion to graphite tubes.
3. Atomization temperature and residence time
At the atomization temperature, because the internal gas path of the graphite furnace is stopped, the atomization process of the sample will produce substances. Without the protection of the internal gas path, argon gas will blow open and directly stay inside the graphite tube. The higher the temperature, the longer the time, causing greater damage.
4. The temperature control window is dirty or the graphite furnace is leaking, and the argon gas is impure.
Light controlled temperature is achieved through a lens at the bottom of the graphite tube, which feeds back the light intensity signal to the graphite furnace control system, thereby controlling the temperature. If the window is dirty at this time, the light intensity signal cannot be obtained correctly. Causing the actual temperature to be higher than the feedback temperature. The consequence is that the graphite tube may be directly burned off. Both argon gas and furnace inlet water will introduce other oxidizing substances besides argon gas at high temperatures, causing erosion and damage to graphite tubes.