真空燒結(jié)泡沫304不銹鋼吸聲性能

真空燒結(jié)泡沫304不銹鋼吸聲性能Sound absorption property of vacuum sintered 304 stainless steel foam

利用掛漿工藝，在1050 ℃下真空燒結(jié)3 h，成功制備三維網(wǎng)狀的泡沫304不銹鋼，制品燒結(jié)良好。樣品平均孔徑約1.8 mm，孔隙率約93.7%。測(cè)試該泡沫金屬在200~6300 Hz及其加入背腔后在2500~4000 Hz時(shí)的吸聲系數(shù), 探討背腔對(duì)樣品吸聲性能的影響。結(jié)果表明：本制品在測(cè)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(shí)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。

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.

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