(1. 北京師范大學(xué) 核科學(xué)與技術(shù)學(xué)院 射線束技術(shù)與材料改性教育部重點實驗室，北京 100875；
2. 北京航空制造工程研究院，北京 100024)
摘 要: 網(wǎng)狀泡沫鈦屬于彈脆性多孔材料，其壓縮曲線的平臺區(qū)為鋸齒形，并在總體上呈緩慢增長的趨勢；其平臺區(qū)結(jié)束的極限應(yīng)變較大，且密實化階段的應(yīng)力-應(yīng)變曲線不是那么陡峭。采用浸漿燒結(jié)法制備獲得了一種孔率在85%~90%之間、孔徑分布在1~3 mm之間的網(wǎng)狀泡沫鈦。結(jié)果表明：該泡沫鈦制品的熱導(dǎo)率隨著樣品孔率的提高而明顯地減小，且總體上具有良好的隔熱性能，孔率為87%~89%的試樣的室溫?zé)釋?dǎo)率為0.4~0.8 W/(m·K)。此外，還測試該泡沫鈦試樣在200~6300 Hz聲頻范圍內(nèi)的吸聲系數(shù)，發(fā)現(xiàn)其第一共振頻率出現(xiàn)在4000 Hz左右，此時試樣的吸聲系數(shù)達到約0.9。
關(guān)鍵字: 多孔材料；泡沫金屬；泡沫鈦；特性；網(wǎng)狀結(jié)構(gòu)
（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
