Damage Control in Grinding of Ceramics

陶瓷是一种坚硬、耐磨、高强度的材料，在高温下仍能保持这些性能。这使它们成为高性能应用的理想选择，但陶瓷也很脆，并且随着裂纹的存在而失去其理论承载能力。同样的特性使陶瓷成为高性能应用的理想选择，也使它们很难加工，低生产率的延展性磨削是目前用于实现精确几何形状和表面的方法。该项目将研究陶瓷的损伤控制磨削，这是一种使用成本更低的机床的方法，可以在更高的材料去除率下完成，而陶瓷的功能性能只会受到很小的影响。该项目的目标是：(1)预测临界磨削深度，裂纹尺寸和形态，(2)通过单粒和磨削实验验证这些预测，以及(3)表征损伤控制地面。这些结果将提高陶瓷零件磨削加工的生产率。因此，在精度、耐磨性和高温性能很重要的应用中，陶瓷元件将得到更广泛的应用。

9500223 Zhang Ceramics are hard, wear resistant, high strength materials, and they can maintain these properties at elevated temperatures. This makes them desirable for high performance applications, but ceramics are also brittle, and lose their theoretical load carrying capacity with the presence of cracks. The same properties that make ceramics desirable for high performance applications, also make them very difficult to process, and low productivity ductile regime grinding is the current method used to achieve precision geometry and surfaces. This project will investigate damage control grinding of ceramics, an approach that uses less costly machine tools, can be done at higher material removal rates, with only a small penalty in functional performance of the ceramics. The project goals are: (1) predicting critical grinding depth, crack size and morphology, (2) verification of these predictions by both single grit and grinding experiments, and (3) characterization of the damage control ground surfaces. These results will lead to higher productivity in processing ceramic parts by grinding. As a result, there will be wider use of ceramic components in applications where precision, wear resistance, and high temperature performance are important.