注浆成型结合真空发泡法制备梯度多孔氮化硅陶瓷

发布时间：2017-12-27 00:00

本文关键词：注浆成型结合真空发泡法制备梯度多孔氮化硅陶瓷　出处：《无机材料学报》2016年08期 　论文类型：期刊论文

【摘要】：通过注浆成型结合真空发泡制备出具有明显梯度结构的多孔氮化硅陶瓷。该工艺在浆料中加入发泡剂,然后注入底部为石膏的模具中,抽真空保压并恒温保存,浆料在低压下会形成孔径梯度结构。研究发现,气压对样品的梯度结构有较明显影响,随着气压由80 k Pa降低到9 k Pa,样品气孔率由59.01%提高到80.85%,当气压为80 k Pa时,样品无宏观梯度结构,随着气压的降低,梯度结构趋于明显。压汞法测试表明,9 k Pa气压制备的样品孔径分布比较分散,具有0.5、20、30、40、60、100和200μm等多种气孔孔径值。该工艺具有简易、廉价,孔径分布和气孔率可调的优点,可实现大尺寸、复杂形貌材料的制备,为梯度多孔材料的制备方法提供了新思路。
[Abstract]:Porous silicon nitride ceramics with obvious gradient structure were prepared by grouting and vacuum foaming. In this process, foaming agent is added into the slurry, and then injected into the mold at the bottom of the gypsum, which is vacuumized and kept under constant temperature. The slurry will form pore size gradient structure at low pressure. It is found that the air pressure has a significant effect on the gradient structure of the sample. With the pressure decreasing from 80 K Pa to 9 K Pa, the porosity of the sample increases from 59.01% to 80.85%. When the air pressure is 80 K Pa, the sample has no macroscopic gradient structure, and the gradient structure becomes obvious with the decrease of air pressure. The test of mercury pressure shows that the pore size distribution of the samples prepared by 9 K Pa pressure is relatively dispersed, with a variety of pore size values, such as 0.5, 20, 30, 40, 60, 100 and 200 micron m. The technology has the advantages of simplicity, low cost, adjustable pore size distribution and porosity. It can realize the preparation of large size and complex shape materials, and provides a new idea for the preparation of gradient porous materials.
【作者单位】：中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室;中国科学院大学;
【基金】：中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室主任青年基金(SKL201401) 青年科学基金(51501215)~~
【分类号】：TQ174.6
【正文快照】： 多孔氮化硅陶瓷以其独特的三维连通网状气孔结构、高气孔率以及超强的化学惰性和高温性能而被广泛应用于过滤器、热交换器、传感器、催化剂载体和能源化工等方面[1]。为了在一些特殊行业或领域,如吸声隔音、雷达电磁波传导等领域延伸其应用范围,研究者们对梯度多孔氮化硅陶

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