(1. 北京師范大學 核科學與技術學院 射線束技術教育部重點實驗室，北京 100875； 2. 北京市輻射中心，北京 100875)
摘 要: 利用掛漿工藝，在1050 ℃下真空燒結3 h，成功制備三維網(wǎng)狀的泡沫304不銹鋼，制品燒結良好。樣品平均孔徑約1.8 mm，孔隙率約93.7%。測試該泡沫金屬在200~6300 Hz及其加入背腔后在2500~4000 Hz時的吸聲系數(shù), 探討背腔對樣品吸聲性能的影響。結果表明：本制品在測試范圍的中高頻段表現(xiàn)出較好的吸聲效果，其第一共振頻率為4000 Hz，此時最大吸聲系數(shù)約0.7；在1250~3150 Hz之間，增加樣品厚度可明顯提高吸聲效果；加入背腔可大幅度提高樣品的整體吸聲效果。
關鍵字: 多孔材料；泡沫金屬；泡沫不銹鋼；吸聲性能
（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
