The operating temperature of a crucible furnace can vary widely depending on the specific materials being melted and the design of the furnace. For instance, in a reduction–oxidation atmosphere, an 85% alumina ceramic crucible can operate effectively at temperatures ranging from 1290°C to 1350°C, with a maximum short-term working temperature of 1400°C. However, the standard operating temperature range for most crucible furnace processes is between 175°C and 730°C, with special applications extending these ranges from as low as 120°C to as high as 925°C. It is crucial to ensure that the crucible is not heated above its maximum temperature to prevent crucible failure, which can be dangerous. Conversely, operating below the crucible’s lower temperature limit can also lead to issues such as oxidation. The selection of the crucible and its operating temperature should align with the melting and holding practices of the specific metals or alloys being processed. Crucible furnaces are versatile, capable of melting a wide range of materials including metals, alloys, glass, and ceramics, and they offer precise temperature control, making them suitable for applications requiring accurate temperature regulation.
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