Graphite is known for its exceptional high temperature resistance, especially in controlled environments like vacuum or inert gas conditions. It can withstand temperatures up to 3000°C (5432°F). However, when exposed to air, its resistance starts to decline around 500°C (932°F), leading to rapid degradation and potential structural failure with repeated exposure.
What is the Temperature Resistance of Graphite? (5 Key Points Explained)
1. 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.
2. 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.
3. 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.
4. 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.
5. 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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