(1. 北京师范大学 核科学与技术学院 射线束技术与材料改性教育部重点实验室，北京 100875；
2. 北京航空制造工程研究院，北京 100024)
摘 要: 网状泡沫钛属于弹脆性多孔材料，其压缩曲线的平台区为锯齿形，并在总体上呈缓慢增长的趋势；其平台区结束的极限应变较大，且密实化阶段的应力-应变曲线不是那么陡峭。采用浸浆烧结法制备获得了一种孔率在85%~90%之间、孔径分布在1~3 mm之间的网状泡沫钛。结果表明：该泡沫钛制品的热导率随着样品孔率的提高而明显地减小，且总体上具有良好的隔热性能，孔率为87%~89%的试样的室温热导率为0.4~0.8 W/(m·K)。此外，还测试该泡沫钛试样在200~6300 Hz声频范围内的吸声系数，发现其第一共振频率出现在4000 Hz左右，此时试样的吸声系数达到约0.9。
关键字: 多孔材料；泡沫金属；泡沫钛；特性；网状结构
（1. Key Laboratory of Beam Technology and Material Modification, Ministry of Education,
College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;
2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China）
Abstract:The foamed titanium belongs to the elastic-brittle material, and its compression curve has a hackle-like plateau and rise slowly. The terminal strain is quite large when this plateau ends, and the stress-strain curve in the densification stage is not so steep. A sort of reticulated foamed titanium with porosity of 85%-90% and pore diameter of 1-3 mm was prepared by the organic foam impregnating method. The results show that the thermal conductivity decreases markedly with increasing porosity for this foamed titanium, which performs a good heat-insulation. The room-temperature thermal conductivity of the sample with 87%-89% porosity is 0.4-0.8 W/(m·K). In addition, the sound absorption coefficient of this foamed titanium is also measured in 200-6300 Hz, the first resonant frequency occurs at about 4000 Hz, and the sound absorption coefficient reaches up to 0.9.
Key words: porous material; foamed metal; foamed titanium; characteristic; netlike structure
