Graphite exhibits a high temperature resistance, particularly under vacuum or inert gas conditions, where it can withstand temperatures up to 3000°C (5432°F). However, when exposed to air, its oxidation resistance starts to decline around 500°C (932°F), leading to rapid degradation and potential structural failure with repeated exposure.
Detailed Explanation:
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Temperature Resistance under Vacuum or Inert Gas: Graphite is highly resistant to high temperatures when used in a vacuum or under inert gas conditions. It can be used up to 2450°C (4442°F) at pressures down to 10-2 torr, and up to 2150°C (3902°F) at pressures of 10-4 torr. This makes it suitable for various high-temperature applications where maintaining a stable environment is crucial.
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Oxidation and Air Exposure: When exposed to air, graphite begins to oxidize at around 500°C (932°F). This oxidation can lead to a significant loss of mass, up to 1% per day under certain conditions. Prolonged exposure to air at high temperatures can cause the graphite to lose thickness and eventually fail structurally.
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Enhanced Properties through Heat Treatment: Heating graphite up to 3000°C enhances its properties, making it even more suitable for high-temperature applications. This heat treatment is part of an emerging market, and graphite has become essential for numerous applications worldwide, including use in composite materials and high-temperature components.
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Applications and Durability: Graphite maintains its thermal stability and dimensions even at temperatures up to 5000°F (2760°C). It is used in various high-temperature applications such as degassing shafts, impellers, fluxing, and injection tubes. Its corrosion resistance and resistance to thermal shock make it ideal for items subjected to intense environmental conditions.
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Graphite Crucibles: Graphite crucibles are capable of withstanding temperatures up to 3000 degrees Celsius (5472 degrees Fahrenheit), making them suitable for melting metals like aluminum, copper, and brass without risk of contamination or damage due to heat stress.
In summary, graphite's high temperature resistance is a key factor in its widespread use in high-temperature applications, particularly under controlled environments such as vacuum or inert gas conditions. However, its susceptibility to oxidation when exposed to air at high temperatures must be carefully managed to prevent degradation and ensure longevity.
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