이상에서 살펴본 바와 같이, 내열재료들은 고밀도를 이용하여 비행하는 물체의 운동에너지를 극대화 시킬 수 있기 때문에 군사적으로 각종 무기체계의 성능 향상에 매우 중요하다. 또한 유도 무기 및 항공기의 경우 고온, 고압 등의 환경에서 운용되기 때문에, 이러한 조건에서 견딜 수 있는 소재 개발이 필수적이다. 따라서 무기 선진국에서는 고밀도 재료인 텅스텐, 몰리브덴, 탄탈륨, 텅스텐-구리 감손우라늄을 활용하기 위한 연구를 활발하게 진행하고 있다. 이중, 텅스

Getter property of nano-sized metallic powders was evaluated as a possible candidate for the future getter material. For the purpose, Ti powders of about 50 nm were prepared by electrical wire explosion. Commercial Ti powders of about 22 micrometer were tested as well for comparison. The room-temperature hydrogen-sorption speed of nano-sized Ti powders was which was more than 4 times higher than that of micron-sized ones. The value is comparable to or even higher than those of commercial products. Its sorption speed increases with activation temperature up to above which it deteriorates due to low-temperature sintering effect of nano-sized particles.

Recently the Marangoni convention is supposed to be an important phenomenon that significantly affects the solidification. For understanding the Marangoni convection mechanism, visualizing the convention phenomenon of molten tin with ultrasonic has been conducted. This paper reports developing a tracer material of micro metal balloon that is used in the molten system. We have succeeded in coating the surface of Shirasu-ballons with nickel by plating process. The obtained metal balloon is spherical and some characterizations were conducted.

This study is an attempt to develop modular house structural systems with safety seismic performances under maximum seismic load of 0.3G. The modular house system was designed with joints (plan) using four-clip simple fastening type, and was also adopted a type of double inter-metallic assembly modular systems using a light metal. The seismic performance was evaluated.

The purpose of this experimental study is to develop an water soluble silicone acrylic surface finishing material of car parks. The heavy metal contents test was conducted in order to supply a guideline for developing a top finishing material. As a results, the sample was satisfied with the quality standard regarding heavy metal contents which is prescribed in KS F 3888-2 of En 71-3. As conclusion, this study confirmed that the developed top finishing material could be an optimized material usable for car parks’ deck.