Welcome to the official website of Luoyang Hypersolid Metal Tech Co., Ltd.
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PRODUCTSleading manufacturer of refractory metal products such as tungsten and molybdenum.
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ABOUTThe main products include pure molybdenum, molybdenum alloy such as MoLa, TZM, and MoW; pure tungsten, tungsten alloy such us WCu, WNiFe, WNiCu and so on.
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NEWSHypersolid Metal (our company name) is supplying products to USA, Europe, India and China.
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CONTACTWe also welcome OEM and ODM orders. Whether selecting a current product or seeking engineering assistance for your application, your needs can always be satisfied here.
Tungsten Crucibles for Sapphire Crystal Growth Furnaces: The Core Component for High-Temperature Crystal Growth
Apr 20,2026
In large-scale sapphire crystal production, the high-temperature container inside the growth furnace directly determines crystal quality. Tungsten crucibles, with their excellent high-temperature stability, have become essential consumables in the heat exchange method for sapphire crystal growth. Sapphire crystals must be grown in extreme conditions exceeding 2000°C, where raw materials are melted and crystals are formed. Conventional metal materials tend to deform, volatilize, or contaminate the melt under such conditions. In contrast, tungsten crucibles provide reliable support for growing large-size, low-defect sapphire crystals due to their high melting point, superior strength, and chemical inertness.
The manufacturing process of tungsten crucibles is highly demanding. High-purity tungsten powder is first used as the raw material and formed through cold isostatic pressing to achieve uniform density. The green body is then sintered in a high-temperature vacuum furnace at temperatures above 2300°C. This process eliminates internal porosity and enhances structural strength. After sintering, precision CNC machining is applied to the inner and outer walls, bottom, and rim to ensure dimensional accuracy and surface smoothness. The final product meets strict assembly requirements for crystal growth furnaces. This complete process ensures high density and uniform structure, allowing the crucible to resist cracking and deformation during prolonged high-temperature operation.
Tungsten has a melting point of up to 3410°C, which is far higher than the melting temperature of sapphire. It offers excellent creep resistance and erosion resistance at high temperatures, ensuring long-term stable performance. In addition, high-purity tungsten exhibits strong chemical stability and does not react with molten alumina at elevated temperatures. This effectively prevents impurity contamination and ensures the purity and optical transparency of sapphire crystals. Compared with graphite or molybdenum alloy crucibles, tungsten crucibles provide better thermal shock resistance and longer service life. As a result, they significantly reduce replacement frequency and overall production costs.
In the production of high-end sapphire products such as LED substrates, optical components, and semiconductor windows, high-precision tungsten crucibles help optimize the thermal field distribution within the furnace. This reduces crystal stress and internal defects, thereby improving the yield of single crystals. As the sapphire industry moves toward larger sizes and higher quality standards, the requirements for tungsten crucible purity, density, and machining precision continue to increase. Accordingly, manufacturing processes are constantly being upgraded, making tungsten crucibles a critical foundational component for the high-quality development of the sapphire industry.
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