Osaka Fuji Corp.

A review.Surface modification technol. is applied in various situations, and it is a method that can be made into a multi-material by coating different materials on the material.For example, it is possible to coat a tough metal with a high-hardness material, or to combine the coating material itself to have a plurality of functions.In this report, the author explained LMD (Laser Metal Deposition), which is one of the methods, with examples for regular use.

A review discusses on the advanced functional processing laser coating.The review describes the laser coating using diffractive optical elements as a heat input control technol.

An increasing demand for electricity and preserving the environment has become a great driving force for the development of advanced boilers for coal-fired plants to improve their plant efficiency by raising the operating temperature. To achieve this purpose, the development of materials that possess a high mechanical strength and excellent resistance against corrosion at high temperatures is required. Considering such situation, the high-temperature corrosion behavior of SiO 2 -forming materials such as CrSi 2 -Ni and CoNiCrAlY-Si alloys in atmospheres containing NaCl and Na 2 SO 4 is introduced. The SiO 2 scale plays a significant role in suppressing the inward diffusion of sulfur and chlorine, resulting in the remarkable suppression of the formation of sulfide and chloride at the scale/substrate interface and inside of the substrate. Based on such results, it is emphasized that SiO 2 -forming materials show outstanding corrosion resistance against atmospheres containing NaCl and Na 2 SO 4 .