[en] As the first wall material of fusion devices, molybdenum is one of the most favored with its high melting point and low sputtering yield. However, its fabrication property is poor in those characteristics such as bending and welding. In this respect and also from cost consideration it is worthwhile to look into the possibility of using a molybdenum coated material in place of bulk molybdenum. Furthermore, such a technique will be effective in reducing light impurities from the first wall by covering residual impurities on the wall with pure molybdenum surfaces. As part of the design study of the JT-4 tokamak, a compact molybdenum source was made for the purpose of in-situ coating studies and several evaluation tests were carried out on the coated samples. (Auth.)