As domestic high-end manufacturing equipment moves towards ultra-high temperature operating conditions, a small fastener is becoming a key factor restricting equipment stability. Recently, a batch of high-performance tungsten screws, specially customized for high-temperature furnaces and vacuum thermal zone environments, completed quality inspection and loading, and will soon be shipped to several vacuum furnace equipment manufacturers and semiconductor single-crystal silicon production companies. These high-purity tungsten screws will be used to fix heating elements, connect heat shields, and assemble furnace structural components, ensuring the structural integrity of the thermal zone module while withstanding ultra-high temperatures exceeding 1600℃ for extended periods.
Coping with Ultra-High Temperatures of 1600℃, Solving the Problem of Loosening Thermal Zone Structural Components
Inside vacuum furnaces, single-crystal furnaces, and high-temperature sintering furnaces, heating elements and heat shields are constantly subjected to extreme environments of heat wave circulation. Ordinary steel screws will rapidly oxidize, soften, or even melt in such scenarios, leading to furnace structural displacement and even equipment failure. The tungsten screws shipped this time are made of tungsten W1 with a purity of up to 99.95%, a melting point exceeding 3400℃, and can maintain stable mechanical strength over long periods in high-temperature environments ranging from 1600℃ to 2000℃.
"Especially in the hot zones of large-sized high-temperature furnaces, each furnace start-up, cooling, and reheating involves a severe thermal cycle impact," explained the technical manager of the shipping company. The extremely low coefficient of thermal expansion of the tungsten screws ensures their dimensional stability under repeated thermal stress, effectively preventing loosening of connections or seizing of threads due to thermal expansion and contraction, thus significantly extending the maintenance cycle of core components of the vacuum furnace.
Precision Customization, Adapting to Diverse Furnace Needs
Due to the varying thermal field layouts and assembly precision requirements of different high-temperature furnaces, general-purpose standard parts often cannot meet the stringent installation requirements. It is understood that the tungsten screws shipped this time cover various specifications from M3 to M30, including different head types such as hexagonal head, socket head cap screws, and flat head self-tapping screws, all produced using a customized "drawing and sample-based" production model. Through precise machining processes, the threads are ensured to remain intact under high loads, and the surface, after alkaline washing or brightening treatment, meets the stringent cleanliness requirements of the vacuum furnace.
In addition to fixing heating elements, these tungsten screws will also be used for thermal field support in single-crystal furnaces and crucible fixation in sapphire growth furnaces. Their excellent creep resistance ensures that the connectors will not deform due to gravity or thermal stress under long-term high-temperature creep conditions, thus guaranteeing the uniformity of crystal growth.
Basic Components Supporting "Major National Equipment" From fixing nozzles in aerospace engines to shielding connections in nuclear reactors, and building thermal fields in high-temperature furnaces, tungsten screws, though small, are indispensable "industrial rice" in equipment operating under extreme conditions. This batch shipment for high-temperature furnace applications not only demonstrates our mature technology in the deep processing of refractory metals but also marks a solid step forward in the localization of basic components supporting high-end equipment such as vacuum heat treatment and semiconductor crystal growth. In the future, more tungsten screws with high temperature resistance and creep resistance will be manufactured here, safeguarding the thermal stability of high-end manufacturing industries worldwide.
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