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Al-Zn-Mg-Cu 발포합금 제조 및 흡음특성에 관한 연구
정승룡 ( Seung Reung Jeong ),허보영 ( Bo Young Hur ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.3
Metallic foam has been known as a functional material which can be used for absorption properties of energy and sound. The unique characteristics of Al foam of mechanical, acoustic, thermal properties depend on density, cell size distribution and cell size, and these characteristics expected to apply industry field. Al-Zn-Mg-Cu alloy foams was fabricated by following process; firstly melting the Al alloy, thickening process of addition of Ca granule to increased of viscosity, foaming process of addition of titanium hydride powder to make the pores, holding in the furnace to form of cooling down to the room temperature. Metal foams with various porosity level were manufactured by change the foaming temperature. Compressive strength of the Al alloy foams was 2 times higher at 88% porosity and 1.2 times higher at 92% porosity than pure Al foams. It`s sound and vibration absorption coefficient were higher than pure Al foams and with increasing porosity.
A356 합금의 발포 특성 및 기계적 성질에 미치는 점증제의 영향
탁병수 ( Byeong Su Tak ),김병구 ( Byeong Gu Kim ),정승룡 ( Seung Reung Jeong ),허보영 ( Bo Young Hur ) 한국주조공학회 2010 한국주조공학회지 Vol.30 No.6
The viscosity of foam metal is necessary to get the pores, but it is difficult to manufacture net-shape foam, because the fluidity decreases by increasing viscosity. In this study, the A356 alloy which has good fluidity and less defect was selected and fabricated to foam metal. To understand about effect of thickening agent on foaming and mechanical properties, quantity of thickening agent was changed. The pore size, porosity and distribution of foam metal were measured by i-solution program. And compression test were performed by UTM. In case of 3.0wt% Ca in thickening agent, it is found that most of foam consist of homogeneous shape, and the growth height had the highest value of 204 mm in the all fabricated foams. The porosity was 93% and compressive strength was 3.1 MPa. In the microstructure, the Al2Si2Ca intermetallic compound and Ti were observed. The vickers hardness value rose with increasing viscosity value.