Tailoring of the Wetting Behavior of Alumina Dispersions on Polymer Foams by Methylcellulose Addition: A Route Toward Mechanically Stable Ceramic Replica Foams,Advanced Engineering Materials

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Tailoring of the Wetting Behavior of Alumina Dispersions on Polymer Foams by Methylcellulose Addition: A Route Toward Mechanically Stable Ceramic Replica Foams
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2019-09-23 , DOI: 10.1002/adem.201900635
Katja Schelm ₁ , Kathleen Dammler ₁ , Ulf Betke ₁ , Michael Scheffler ₁

Affiliation

Polyurethane (PU) foams with open porosity and a pore count of 20 ppi are used as templates for the preparation of open‐porous alumina foams by the replica method. The effect of methylcellulose addition on the rheological properties of the aqueous alumina dispersions is investigated. Methylcellulose leads to an increased viscosity of the dispersions and is effective in increasing the yield strength. The compressive strength and the structural parameters of replica foams made by the respective dispersions are correlated with the rheology of the alumina dispersions used in foam manufacturing. An increased viscosity leads to an improved wetting behavior of the PU template and a more uniform coating with the alumina dispersion. The presence of methylcellulose also has the effect that it increases the adhesion of the coating dispersion on the PU template and causes a more homogenous coating, especially at the sharp edges of the templates' struts. As a consequence, the compressive strength of the sintered foams is significantly increased from 0.4 to 1.1 MPa at the same relative density level.

中文翻译：

通过添加甲基纤维素量身定制氧化铝泡沫在聚合物泡沫上的润湿行为：通向机械稳定的陶瓷仿制泡沫的途径

开孔孔隙率为20 ppi的聚氨酯（PU）泡沫被用作通过复制方法制备开孔氧化铝泡沫的模板。研究了甲基纤维素添加对水性氧化铝分散体流变性质的影响。甲基纤维素导致分散体的粘度增加，并有效地提高了屈服强度。由各分散体制得的复制泡沫的抗压强度和结构参数与泡沫制造中所用的氧化铝分散体的流变学相关。粘度的增加导致PU模板的润湿性能得到改善，并且氧化铝分散体的涂层更均匀。甲基纤维素的存在还具有增加涂层分散体在PU模板上的粘附力并导致更均匀涂层的效果，尤其是在模板撑杆的尖锐边缘处。结果，在相同的相对密度水平下，烧结泡沫的抗压强度从0.4MPa显着增加到1.1MPa。

更新日期：2019-09-23

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