Titanium rods, zirconium rods and aluminum-boron rare earth rods were put into the vacuum consumable shell furnace, and then the consumable electrode diameter was determined according to the crucible size of the vacuum consumable shell furnace, and the consumable electrode length was determined according to the crucible melting capacity, and the electrode was assembled by welding with plasma argon protection. Compound good consumable electrode clamping on the electrode pole, the manufacturing of heat resisting cast iron ingot mould put charging, the clamping is, and then close the oven door, pumping air into vacuum state, melting current and voltage and electrode dimensions according to the volume of furnace type, ensure complete melting complete a consumable electrode, and then flip crucible, casting ingot casting, vacuum, come; In this invention, on the basis of the main components of the original scheme, a small amount of refined grain element B and rare earth element is added, and a unique smelting ingot manufacturing process is used to produce high-quality ingot with uniform composition and no segregation of all kinds.
Titanium and its alloys with its body and fragments approximate elastic modulus, good biocompatibility and excellent corrosion resistance in a biological environment has been more and more widely used in clinic, initially applied to clinical main pure titanium and titanium alloy Ti-6Al-4V, pure titanium in the physical environment has good corrosion resistance, but its strength is low, At present, it is mainly used for oral repair and bone replacement with small bearing capacity. Ti-6Al-4V titanium alloy has high strength and good machining performance. This alloy was widely used as surgical repair material in the 1970s, such as hip joint and knee joint. It is also clinically used as a femur and tibia replacement material. However, this kind of alloy contains two elements, aluminum and vanadium. vanadium is considered to be toxic to organisms, and its toxic effect is related to the biochemical metabolism of phosphate. In order to avoid the potential toxicity of vanadium element, two new α+β type medical titanium alloys Ti-5Al-2.5Fe and Ti-6Al-7Nb were developed in Europe in the mid-1980s. The mechanical properties of these alloys are similar to those of Ti-6Al-4V, and the toxic element vanadium is replaced by ferrum and niobium.
In recent years the development of new type medical beta titanium alloy mainly high Mo and Nb elements instead of V, further reducing the elastic modulus E of titanium alloy, with bone elastic modulus close to human body, and avoid the phenomenon of stress shielding to occur around implant bone absorption, resulting in implant loosening or fracture, planting failure cause. However, molybdenum or niobium are refractory metals, and segregation is easy to occur in the melting process, which seriously affects the mechanical property stability. Therefore, the preparation of titanium alloy ingot with high composition uniformity is the key technology for the production of β type medical titanium alloy. The mechanical properties of titanium alloy processing materials produced on the basis of this high quality ingot can be guaranteed to be reliable and stable.
