Zirconia ceramic mandrel is specially designed for heat pipe sintering molding process. It features excellent high-temperature stability, chemical inertness and non-stick surface. It maintains no deformation during vacuum sintering, does not adhere to copper powder, and can be extracted smoothly without damaging the capillary structure. With high dimensional accuracy, wear resistance and durability, it greatly improves the forming quality of heat pipe vapor chambers and product consistency, making it an ideal tool for high-end heat pipe manufacturing.