(1. 北京师范大学 核科学与技术学院 射线束技术教育部重点实验室，北京 100875； 2. 北京市辐射中心，北京 100875)
摘 要: 利用挂浆工艺，在1050 ℃下真空烧结3 h，成功制备三维网状的泡沫304不锈钢，制品烧结良好。样品平均孔径约1.8 mm，孔隙率约93.7%。测试该泡沫金属在200~6300 Hz及其加入背腔后在2500~4000 Hz时的吸声系数, 探讨背腔对样品吸声性能的影响。结果表明：本制品在测试范围的中高频段表现出较好的吸声效果，其第一共振频率为4000 Hz，此时最大吸声系数约0.7；在1250~3150 Hz之间，增加样品厚度可明显提高吸声效果；加入背腔可大幅度提高样品的整体吸声效果。
关键字: 多孔材料；泡沫金属；泡沫不锈钢；吸声性能
（1. Key Laboratory of Radiation Beam Technology, Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China; 2. Beijing Radiation Center, Beijing 100875, China）
Abstract:304 stainless steel foam with the pore size of about 1.8 mm and the porosity of about 93.7% was prepared by the slurry sintering method at 1050 ℃ for 3 h in vacuum. The sound absorption coefficient was tested for the foam at 200-6300 Hz and for the back cavity composite at 2500-4000 Hz. The results show that the foam sample shows a good sound absorption in the middle and high frequency range, exhibiting the first resonance frequency of around 4000 Hz and the maximum absorption coefficient of about 0.7. The absorption performance may be obviously improved by increasing the sample thickness at 1250-3150 Hz and by adding a back cavity at 2500-4000 Hz.
Key words: porous material; metal foam; stainless steel foam; acoustic property
