http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
安得圭,許甫寧,金相烈,朴修漢,安孝俊,朴先正 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.8
In the process of metal foaming, hydride metal often is used as foaming agent. In our experiment TiH_2 was chosen as foaming agent to produce the Al foams. Ti scraps were usually produced in the machining process of panels, wire and pipes. To recycle Ti scraps, Ti scraps of various shape as like plate, chip, pipe etc., were hydrogentreated in self-made hydride furnace. The samples were milled in a ball mill, and then morphologies of milled particles were observed by SEM. Laser and SEM were used to analyze the size distribution, and XRF, XRD, TGDTA analysis were performed to investigate the composition and reaction conditions to prove the foaming possibility of forming agent in the production of Al foams.
발포재료(Al)의 점성 및 표면장력과 첨가요소의 영향에 관한 연구
박수한,김상열,안득규,하동인,조순형,배석천,허보영,Park, Soo-Han,Kim, Sang-Youl,Ahn, Duck-Kyu,Ha, Dong-In,Cho, Soon-Hyung,Bae, Suk-Cheon,Hur, Bo-Young 한국재료학회 2002 한국재료학회지 Vol.12 No.9
Porous Al metal was produced by batch type casting process. In this foaming process, the viscosity and surface tension of molten Al as two most important factors have been investigated in the temperature range of 680-95$0^{\circ}C$ by the ring method and rotational method respectively. The experimental results showed that both the surface tension and viscosity of the melt decreased linearly with increasing temperature. Addition of Ca decreased surface tension, but increased viscosity significantly.
金相烈,許甫寧,權哲奎,安得圭,朴脩漢 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.8
Mechanical properties of metal foams depend on cell type, shape, size, homogeneity, surface area and relative density, and particularly are proportional to its density. Deformation of metal foams includes the plastic deformation and collapse and shows a plateau area followed by yielding point. Metal foams follow the morphological rules that are about cell type, size and homogeneity. Metal foams with homogeneous wall thickness and linear cell boundary show the similar mechanical properties to bulk metal and thickness averaged by diameter affect the mechanical properties more seriously than cell size. In this paper, the effects of holding furnace temperature on macrostructure of Al foams were studied, sound absorption and thermal conductivity tests were carried out and impact test did with different cell size. To avoid the disappearing of bubbles by coalescence or burst, foaming agent(TiH_2) containing gas releasing component was used to fabricate the closed-cell Al foams. Melting was carried out near at 680℃ considering the melting point of recycled Al alloy and gas releasing point of TiH_2. The velocity of decomposition decreased with decrease of the time and temperature. Impact absorption energy of Al foam has 27 ㎏-㎝ at about cell size 2.7 ㎜. The acoustical performance of Al foam is considerably improved: its absorption coefficient shows over NRC 0.7 from 2000 to 4000 ㎐. Thermal conductivity of Al has about 2 W/mk.