GAO Xiumin 1, NIE Guanglin 1, BAO Yiwang 1,2
(1. China Building Materials Academy Co., Ltd., Beijing 100024, China;
2. State Key Laboratory for Green Building Materials, 100024 Beijing, China)
Abstract: Due to the size effect and large deflection, mechanical properties of thin ceramic plates (less than 1.0 mm thick) can hardly be measured by the conventional test method for engineering ceramics of standard sizes. With the widespread use of thin ceramic substrate plates in industries, the evaluation of mechanical properties becomes a great challenge. In this work, a new test method named the analogous coating method was proposed for determining the bending strength and elastic modulus of thin ceramic plates. In this way, the stress gradient of the thin ceramic substrate is close to the stress gradient of the standard-sized ceramic specimen. Thus, the effect of the stress gradient on the strength is avoided. A series of thin ceramic samples with different thicknesses (0.2 mm-1.0 mm) were measured. The measured results agree well with the experimental results of bulk ceramics measured by the conventional test method, indicating that the analogous coating method is
feasible for thin ceramic plates.
Key words: thin ceramic plate; analogous coating method; stress gradient; bending strength; elastic modulus