The present investigation aims at determining the optimum quantity of saw dust that can be substituted to the secondary ceramic slurry for increasing the porosity of the destroyable investment casting ceramic shells without affecting its adequate strength. Further, both the slurry responses, namely viscosity, density, plate weight and pH, and shell responses, namely thickness, porosity, green strength and fired strength, determined from the saw dust based secondary ceramic slurry were optimized using Taguchi’s methodology. The input process parameters opted for the conduct of experiments were three different weight per cent of saw dust (3%, 5% and 7%), filler-to-binder ratio (1.5:1, 1.75:1 and 2:1) and slurry stirring time (18, 24 and 48 h). The optimum amount of saw dust that can be substituted in the secondary ceramic slurry for constructing the qualitative ceramic shells was found to be 5 wt%. The best combination of filler-to-binder ratio was established to be 2:1 for most of the responses except shell porosity. The range selected for slurry stirring time was found to be the insignificant process parameter influencing both slurry and shell responses.

本研究旨在确定可替代第二陶瓷浆料的锯末的最佳量，以增加可破坏熔模铸造陶瓷壳的孔隙率，而不影响其足够的强度。此外，使用田口的方法优化了由基于锯末的二次陶瓷浆料确定的浆料响应，即粘度，密度，板重和pH，以及壳响应，即厚度，孔隙率，生坯强度和烧结强度，两者均得到优化。选择进行实验的输入工艺参数是三种不同重量百分比的锯末（3％，5％和7％），填料与粘结剂的比例（1.5：1、1.75：1和2：1）和浆液搅拌时间（18、24和48小时）。发现可以在次级陶瓷浆料中代替以构造定性陶瓷壳的锯末的最佳量为5重量％。对于除壳孔率以外的大多数响应，填料与粘结剂之比的最佳组合确定为2：1。发现为浆料搅拌时间选择的范围是影响浆料和壳响应两者的无关紧要的工艺参数。