An efficient heat insulation barrier constructed with molybdenum discs
In the fields of materials science, aerospace, and semiconductor manufacturing, which pursue extreme high temperatures and pure environments, vacuum and inert gas-protected high-temperature furnaces are the core equipment for material sintering, heat treatment, and crystal growth. Inside the furnace chamber, the temperature often easily exceeds 1,000 degrees Celsius, approaching 2,000 degrees Celsius or even higher. In this fiery "mini-universe", a multi-layer insulation system composed of molybdenum discs as the core acts like a sturdy fortress, silently safeguarding the heat energy and isolating pollution, becoming the key to the realization of high-temperature processes.
According to the Stefan-Boltzmann law, the amount of thermal radiation is proportional to the fourth power of the temperature. At ultra-high temperatures, the heat of the furnace core will dissipate at an astonishing rate through radiation to the surrounding cold walls (usually water-cooled furnace walls), causing a sharp increase in energy consumption. Ordinary metals or refractory materials will soften, melt or volatilize violently at such high temperatures and cannot be used as components close to heat sources. Any volatile substances from the insulation materials will contaminate the atmosphere inside the furnace, thereby staining the precision workpieces being processed (such as aerospace alloys, semiconductor ingots, high-purity graphite, etc.), leading to a decline in product performance or even scrapping.
The molybdenum round piece can fulfill the role of the "heat insulation guardian" in the high-temperature furnace due to its two core physical properties. An extremely high melting point (2622℃). This is the fundamental reason why the molybdenum round piece can withstand high temperatures directly. Even in a working environment of 1800-2000℃, it can still maintain its structural strength and shape unchanged, without softening, creep, or melting, providing a solid physical framework for the entire insulation system. An extremely low vapor pressure. In high-temperature and vacuum environments, the volatility of materials is fatal. The low vapor pressure characteristic of the molybdenum round piece means that it is extremely stable at high temperatures and has an extremely low evaporation rate. This ensures that it does not become a pollution source and can maintain the high purity of the furnace environment for a long time, meeting the most stringent process requirements.
The multi-layer heat insulation screen composed of molybdenum discs works not simply by "blocking" heat, but by employing sophisticated physical designs to "reflect" and "dissipate" heat. Heat mainly transfers through radiation in a vacuum. The multi-layer insulation screen is made up of a series of parallel-arranged, smooth-surfaced molybdenum discs or thin plates, with a tiny gap between each disc. When the thermal radiation (mainly infrared rays) from the high-temperature furnace core strikes the innermost first molybdenum disc, its smooth surface will reflect most of the heat back to the furnace core. The remaining portion is absorbed by the molybdenum disc, causing its temperature to rise. This molybdenum disc then radiates heat to both sides, but the radiation energy has significantly weakened. This process repeats on each outer molybdenum disc. With each layer, the intensity of thermal radiation is significantly weakened. Through this "layer-by-layer reflection and step-by-step attenuation" mechanism, the heat ultimately transferred to the external water-cooled furnace wall becomes negligible.
These parallel-arranged molybdenum discs physically create a multi-layered gap region with high vacuum or static gas. This structure significantly increases the path resistance (thermal resistance) for the heat flow from the furnace core to the furnace shell. As a result, the thermal efficiency of the furnace is revolutionized, the heating process is faster, the energy consumption required for insulation is greatly reduced, and at the same time, the load of the cooling system (water cooling) is also alleviated.
This dense layer of molybdenum circular plates not only isolates heat but also effectively prevents the migration of trace volatile substances from the internal heating elements or other high-temperature components to the outside, and vice versa, forming a two-way physical pollution barrier.
Typical application scenarios of molybdenum round plate heat insulation screens
Vacuum sintering furnace: Used for sintering hard alloys such as tungsten carbide and titanium carbide, as well as high-purity ceramics. The molybdenum round plate heat insulation screen ensures the uniform temperature field inside the furnace and extremely high process purity.
Crystal growth furnace: During the growth of sapphire crystals and semiconductor silicon single crystals, a stable and clean high-temperature environment is the key to success.
Heat treatment of aerospace-grade high-temperature alloys: When conducting solution treatment or aging treatment on critical components such as turbine blades, any contamination must be avoided.
High-purity graphitization furnace: At the extremely high temperature required for converting carbon materials into high-purity graphite, molybdenum discs are among the few metal insulating materials that can remain stable.
The molybdenum disc is in high demand in various parts of the world, such as: USA, Canada, Chile, Brazil, Argentina, Colombia, Germany, France, United Kingdom, Italy, Sweden, Austria, Netherlands, Belgium, Switzerland, Spain, Czech Republic, Poland.
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