SUN Yi 1,2, BAO Yiwang 2,1, LI Yueming 1, WAN Detian 2,1, LI Kai 1, PAN Guoxiang 1, WU Tianye 1
(1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. China Building Materials Academy, Beijing 100024, China)
Abstract: Significant improvement in strength of ceramics is a key technical problem to be solved urgently in traditional ceramics industries. Due to the constraints of construction equipment and production costs, the densification and fine-grained technology and the introduction of reinforcement to improve the strength of traditional ceramics also encountered difficulty for large-scale applications. Similar to tempered glass, forming a layer of compressive residual stress on the surface of ceramics can greatly increase their strength, which has been attracting a wide range of interests. This paper is aimed to summarize the current progresses in the application of prestressing to strengthen the traditional ceramics, propose a pre-stressed coating design and compare the effects of different prestressing treatments on daily ceramics in Jingdezhen area. It is demonstrated that the prestressed coating technique can be used to greatly increase the strength of traditional ceramics, with the advantage of universality and without the shape and size limitation. Therefore, prestressed ceramics are essentially "toughened ceramics". It is believed that the proposal and implementation of such a technique will promote the development of "energy saving and consumption reduction" in ceramic industries and bring out breakthrough in the technical bottleneck of "low carbon" in ceramic industries, showing an attractive application prospect.
Key words: pre-stressing design; traditional ceramics; high strength; coating