Aluminum generally has better heat resistance than copper. This is due to its higher melting point and lower thermal conductivity compared to copper. Aluminum has a melting point of approximately 660 degrees Celsius, while copper's melting point is around 1085 degrees Celsius. Additionally, aluminum has a thermal conductivity of about 237 W/mK, whereas copper's thermal conductivity is significantly higher at approximately 401 W/mK. This lower thermal conductivity in aluminum means it can dissipate heat less efficiently, which can be advantageous in certain applications where excessive heat is a concern.

The higher melting point of aluminum is particularly important in high-temperature environments. For instance, in aerospace applications, where components are exposed to extreme heat, aluminum alloys are often used due to their ability to maintain structural integrity at high temperatures. Copper, on the other hand, is more susceptible to thermal expansion and deformation at high temperatures, which can lead to reduced performance and reliability.

Data from various sources support these claims. According to the U.S. Department of Energy, aluminum has a higher melting point than copper, which is a critical factor in determining its heat resistance. Furthermore, a study published in the Journal of Materials Engineering and Performance found that aluminum alloys exhibit better thermal stability than copper alloys at high temperatures. This study concluded that aluminum alloys are more suitable for applications requiring resistance to high temperatures and thermal expansion.

In summary, aluminum generally has better heat resistance than copper due to its higher melting point and lower thermal conductivity. These properties make aluminum a preferred material in applications where high-temperature environments are a concern.