| Title |
Design of cold crucible and melting of titanium |
| Authors |
정순효(S . H . Chung) ; 김경태(K . T . Kim) ; 조영환(Y . W . Cho) ; 오영주(Y . J . Oh) ; 심재동(J . D . Shim) |
| Abstract |
The design of a laboratory cold crucible for melting titanium and its alloys has been optimized using both the numerical simulation and the physical model experiment with tin. The electromagnetic field and magnetic pressure distribution in the cold crucible were calculated using a three dimensional finite element method. Temperature of the molten tin and titanium was measured under various electric power input and with different melt weight. The shape of the melt free surface, total melt surface area, soft-contacting area, and the Joule heating rate were also calculated. With the help of the heat transfer equation, overall heat transfer coefficient at the interface between the melt and the cold crucible was determined. With changing electric power input, stable and/or unstable melting states have occurred sequentially. Only in the stable melting state, superheating of tin and titanium, about. 70-100 K above the their melting temperatures was achieved. Overall heat transfer coefficient for tin and titanium were estimated as 3500 and 800 V/㎡K, respectively. |