TZM mold is popular for metal casting due to the unique combination of TZM properties, including a 2,470°C (4,478°F) melting point, good thermal conductivity, low coefficient of thermal expansion, and excellent corrosion resistance. These properties make it well-suited for use in high-temperature environment conditions where other materials might fail or degrade over time. Additionally, TZM’s efficiency in transferring heat and maintaining its shape and dimensions throughout the casting process ensures the high quality and accuracy of the cast metal part. TZM’s superior properties make it a reliable and efficient material for creating metal casting molds, particularly for high-temperature demanding applications in the aerospace, defense, and industrial sectors.
Here are some additional details on why TZM mold is well-suited for metal casting applications:
High melting point
TZM is a high-performance alloy made up of titanium, zirconium, and molybdenum, which gives it a significantly higher melting point than pure molybdenum. This is due to the combined effects of solid solution strengthening, grain boundary strengthening, and oxidation resistance, which make TZM mold highly resistant to deformation and failure under extreme temperatures and harsh environments. With the 2,470°C (4,478°F) melting point, TZM is capable of withstanding high-temperature applications where pure molybdenum may fail.
High thermal conductivity
TZM casting mold exhibits a relatively high thermal conductivity, allowing it to effectively transfer heat. This property is crucial in metal casting applications, as it helps to prevent the formation of hot spots and ensures the even distribution of molten metal throughout the mold. Additionally, TZM’s thermal conductivity can help to shorten the time of cooling after the casting process is finished. At room temperature, the alloy’s thermal conductivity ranges from 20-60 W/m·K, with a corresponding thermal expansion rate of 4.5-6.0 × 10^-6/℃. At 1300°C, TZM’s thermal conductivity and thermal expansion rate can retain at 5-20 W/m·K and 10-15 × 10^-6/℃ due to the diffusion of solid solution strengthening elements and its high recrystallization temperature.
Low thermal coefficient rate
TZM mold exhibits a remarkably low coefficient of thermal expansion. This is an essential property in metal casting applications since the mold needs to maintain its original shape and dimensions throughout the casting process, even as it experiences multiple times of heating and cooling cycle. With its exceptional dimensional stability and cracking resistance to thermal stress, TZM is an ideal material for use in metal casting molds, particularly in high-temperature environments.
Good corrosion resistance
TZM is highly resistant to corrosion, making it well-suited for use in harsh environments where other materials might degrade or fail over time. Good corrosion resistance can help to ensure that the TZM mold remains in good condition over multiple casting cycles.