Medicine to obtain a good casting cast titanium tube size to the embedding material hardening and titanium alloy thermal expansion compensation expanded metal casting shrinkage is the most commonly used method. Titanium tube casting line shrinkage of 0.9-1.0%, the total expansion required when casting titanium tubes embedded material must be able to compensate for the contraction of the range of metal and titanium seamless titanium tube tube system in principle, with the cast of embedding material not mix. Therefore, the choice of cast titanium with embedded material conditions must have the following conditions:
1. Rarely react with titanium.
2 to obtain good surface properties.
3 castings are not contaminated.
4 titanium tube shrinkage medical grade titanium alloy compensated moderate swell.
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