Abstract

Firstly, the slurry coating process was carried out for the polymer foam, and then the coated foam was sintered at 1160–1400 °C to yield a reticular iron foam with the pore size of 0.5–2.0 mm and porosity of 75%–95%. After this, an iron foam sandwich structure was further obtained by thermal diffusion combination of the iron foam with the stainless steel sheet treated by a surface activation. The bonding strength of the metal face-sheet and the porous core was examined by testing three samples from sintering at 1300 °C and two samples from sintering at 1160 °C. The results show that the core of the sandwich structure is well metallurgically bonded with the metal face-sheet for the sample from sintering at 1300 °C for 2 h and can not for that from sintering at 1160 °C for the same period. The analysis reveals the vacuum degree of the present sintering system (i.e., the system pressure at room temperature is less than 5 × 10⁻² Pa, and the maximum pressure may be up to 20–40 Pa during the high temperature sintering) can well prevent the oxidation of metal iron in the high temperature process of heat treatment. The face-sheet/foam-core bonding state in the sandwich structure is investigated, and the bonding strength is found to be higher than the tensile failure strength of the core foam itself.

Graphic Abstract

中文翻译：

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铁泡沫夹芯结构的初步研究

摘要

首先，对聚合物泡沫进行浆液涂覆，然后在1160–1400°C下烧结涂覆的泡沫，制成网状铁泡沫，孔径为0.5–2.0 mm，孔隙率为75％–95％ 。此后，通过将泡沫铁与经表面活化处理的不锈钢板热扩散结合，进一步获得泡沫铁夹层结构。通过测试在1300℃下烧结的三个样品和在1160℃下烧结的两个样品来检查金属面板和多孔芯的结合强度。结果表明，在1300°C烧结2 h的样品中，三明治结构的芯与金属面板良好地冶金结合，而在1160°C烧结的样品则不能。⁻²  Pa，并且在高温烧结过程中最大压力可能高达20–40 Pa）可以很好地防止在高温热处理过程中金属铁的氧化。研究了夹层结构中的面板/泡沫-芯粘结状态，发现粘结强度高于芯泡沫本身的拉伸破坏强度。

图形摘要