Abstract
The method of Electron Beam Floating Zone Melting (EBFZM) is well known as an effective treatment in refining of metals that has high melting point and reactive properties at high temperature.1, 2, 3 However, the sintered tungsten rod contains a great deal of gases.4 Thus, degassing is very important process for purification.
In this present work, we refined tungsten rods by method of EBFZM, and estimated a purity of tungsten rods by measurement of Residual Resistivity Ratio (RRR)5, 6 and micro Vicker's hardness.7 As a result, it was confirmed as follows.
1. Annealing was very effective treatment in degassing of tungsten rods.
2. EB Gun's fast travel brought about a difference in refining conditions between rod's inside and one's surface, resulting in the formation of gaseous pools in rod's inside.
