Why extreme low oxygen and 3000°C levels are possible! Explaining the principles of a small carbon furnace.
The small carbon furnace is characterized by its ability to maintain an extremely low oxygen environment and ultra-high temperatures (around 3000°C). In this explanation, we will simply clarify "why this is possible" from a fundamental perspective. 1) Why does it become "extremely low oxygen"? ■ The furnace material itself acts as an "oxygen getter." The hot zone of the furnace is composed of carbon (graphite). Residual O2/CO2/H2O reacts with carbon and is reduced and fixed as CO/CO2, effectively lowering the oxygen activity. As a result, even materials that are sensitive to oxidation can be processed in a mild atmosphere. ■ Built-in vacuum system + replacement Before heating, the system is evacuated, and by repeatedly purging with inert gas (such as Ar/N2), air inside the sample can be expelled in advance. This is effective for gas replacement in pores and powder gaps that cannot be reached by simple "ventilation." 2) Why is "3000°C" possible? ■ Heating element = high-temperature stability of graphite Graphite exhibits extremely high heat resistance under inert atmospheres and vacuum, allowing for efficient heating of the hot zone through resistance heating. *For more details, please download the PDF or feel free to contact us.
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■ Thermal design based on "hot zone optimization" Optimize insulation materials (carbon-based) and heating elements/tools within the same system to minimize radiation and conduction losses. Achieve rapid temperature rise and high maximum temperatures even in compact designs. ■ Compatibility of vacuum and inert atmosphere To avoid oxidation even at high temperatures, switching and combining vacuum and inert atmospheres is easy. This makes it feasible to operate at temperatures around 3000°C while ensuring the durability of graphite. In the next Part 4, we will introduce representative reaction and process examples. *For more details, please download the PDF or feel free to contact us.
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Our company integrates three technologies: "electricity," "equipment," and "chemistry," using our unique know-how to develop innovative heating furnaces and other equipment. We handle various electric furnaces (heating furnaces) such as carbon furnaces, multi-atmosphere furnaces, metal furnaces, and chlorine furnaces, leveraging our proprietary high-temperature electric furnace technology. We are not just an equipment manufacturer; we are a strategic development partner that supports innovative manufacturing with advanced heating, looking ahead to the standards of the next decade alongside our customers.