Pressure slip casting of coarse grain oxide ceramics
Pressure slip casting of coarse grain oxide ceramics
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DOI：
10.1016/j.ceramint.2011.06.064
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发表时间：
2012
影响因子：
5.2
通讯作者：
S. Schafföner;C. Aneziris
中科院分区：
文献类型：
--
作者：
S. Schafföner;C. Aneziris
本文研究了采用水溶性有机添加剂体系压力注浆法制备大尺寸粗晶氧化物陶瓷坯体。这种有机添加剂系统可以制备稳定的、可泵送的泥浆，其中含有尺寸高达3 mm的富铝镁铝酸盐尖晶石，并且可以很容易地剥离无裂纹、尺寸稳定的物体，由于沉积而导致的梯度可以忽略不计。对烧结体的切割样品进行了表观孔隙率、动弹模数、断裂模数和孔径分布的测试。计算机断层扫描显示非常均匀致密的小体。通过学生t检验，评价了不同最大颗粒尺寸以及泥浆可能的沉积和分离对力学性能和微观结构的影响。这项研究的最有希望的结果表明，用压力注浆法制备耐火材料和其他高温应用的粗晶陶瓷是可能的。
This contribution investigates the pressure slip casting of large coarse grain oxide ceramic bodies with a water soluble organic additive system. This organic additive system allows the preparation of a stable and pumpable slip containing alumina rich magnesia aluminate spinel of a size of up to 3mm and an easy demolding of crack free, dimensionally stable bodies with negligible gradients due to sedimentation. Cut out samples of fired bodies are examined on apparent porosity, dynamic elastic modulus, modulus of rupture, and pore size distribution. Computer tomography showed very homogenous and dense bodies. The effects of different maximum grain sizes as well as possible sedimentation and segregation of the slip on the mechanical properties and microstructure are evaluated by using the Student's t-test. The most promising results of this study indicate that it is possible to reproducible fabricate coarse grain ceramics for refractory and other high temperature applications by pressure slip casting.