Cellular mullite materials processed by direct foaming and protein casting
Cellular mullite materials processed by direct foaming and protein casting
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DOI：
10.1016/j.jeurceramsoc.2019.02.018
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发表时间：
2019-07
影响因子：
5.7
通讯作者：
M. Sandoval;L. Ramajo;M. Camerucci
中科院分区：
文献类型：
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作者：
M. Sandoval;L. Ramajo;M. Camerucci
本文通过泡沫莫来石-牛血清白蛋白（BSA）和莫来石-BSA-甲基纤维素悬浮液的热直接固结、烧尽（650℃，2小时）和烧结（1600℃，2小时）制备了蜂窝状莫来石体。对蛋白质铸造中常规使用的成型途径进行了一些修改，并纳入了所提出的加工中，以获得具有受控且均匀的微观结构的物体。通过孔隙率测量、XRD 物相分析以及 SEM 和 Hg 孔隙度测定法进行微观结构分析来表征材料。确定了莫来石基体的孔尺寸分布、开孔和闭孔百分比、窗口尺寸和间隙孔径分布以及微观结构特征的特征参数。此外，还分析了基本 2D 细胞尺寸参数和全局 3D 体视学参数。结果表明，通过加工路线的设计和控制，使用BSA作为发泡剂和粘结剂/固结剂，可以开发出具有分级孔隙率和不同微观结构特征的莫来石体。
In this paper, cellular mullite bodies were developed by thermal direct-consolidation of foamed aqueous mullite-bovine serum albumin (BSA) and mullite-BSA-methylcellulose suspensions, burning out (650 °C, 2 h) and sintering (1600 °C, 2 h). Some modifications to the shaping route conventionally used in protein casting were incorporated in the proposed processing to obtain bodies with controlled and homogeneous microstructures. The materials were characterized by porosity measurements, analysis of phases by XRD, and microstructural analysis by SEM and Hg-porosimetry. Characteristic parameters of cell size distributions, percentage of open and closed cells, window size and interstitial pore size distributions, and microstructural features of the mullite matrix were determined. Moreover, basic 2D cell size parameters and global 3D stereological parameters were analysed. The obtained results showed that mullite bodies with hierarchical porosity and different microstructural features were developed from the design and control of processing routes, which use BSA as a foaming and binder/consolidator agent.