(1. 北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083;
2. 安泰科技股份有限公司， 北京 100081)
摘 要: 采用定向凝固法， 在氫氣壓力為0.2 MPa、 熔煉溫度為1 200 ℃的條件下制備了規(guī)則圓柱形氣孔沿軸向定向分布的藕狀多孔純銅棒材料， 棒材直徑為45 mm， 長(zhǎng)度約為125 mm。 測(cè)定了所制備材料的密度、 孔隙率和通孔率， 對(duì)所制備多孔材料的氣孔形貌和氣孔大小分布進(jìn)行了分析和表征， 并對(duì)所制備的樣品沿平行于氣孔方向和垂直于氣孔方向的壓縮性能進(jìn)行了測(cè)試。 結(jié)果表明， 所制備純銅棒的平均密度為4.48 g/cm3， 平均孔隙率為50％； 氣孔直徑分布為0.3～1.3 mm， 氣孔平均直徑為0.81 mm； 藕狀多孔純銅的壓縮性能存在明顯的各向異性。
關(guān)鍵字: 定向凝固； 藕狀多孔金屬； 孔隙率； 壓縮性能； 制備與表征
lotus-type porous pure copper bar
FANG Yu-cheng2, WANG Hao2
（ 1. School of Materials Science and Engineering,
University of Science and Technology Beijing, Beijing 100083, China;
2. Advanced Technology and Materials Co., Ltd., Beijing 100081, China）
Abstract: Lotus-type porous pure copper bars with diameter of 45 mm and height of 125 mm were fabricated by unidirectional solidification at hydrogen pressure of 0.2 MPa and molten temperature of 1200 ℃. Density, porosity and ratio of open pores of the fabricated samples were measured. Shape and diameter distribution of the pores were characterized, and compressive properties parallel and perpendicular to the direction of pores for the fabricated samples were tested. The results show that the mean density and porosity are 4.48 g/cm3 and 50%, respectively. Diameter of the pores distributes in the range of 0.3-1.3 mm, and the mean diameter of pores is 0.81 mm. Compressive properties of lotus-type porous pure copper show remarkable anisotropy.
Key words: unidirectional solidification; lotus-type porous metal; porosity; compressive properties; fabrication and characterization
