White S N, Seghi R R
Department of Restorative Dentistry/Biomaterials, University of Southern California School of Dentistry, Los Angeles.
Dent Mater. 1992 Sep;8(5):320-3. doi: 10.1016/0109-5641(92)90107-n.
The kinetics of ion exchange strengthening of three feldspathic porcelains were investigated. Data describing the effects of treatment time and temperature on flexural strength were produced. The temperature effect results support the hypothesis that the opposing phenomena of diffusion and relaxation control residual stress. The time effect results suggest that Fick's Law of diffusion and diffusional creep control flexural strength. Mechanisms were proposed. These findings suggest that precise control of temperature is more critical than control of time in this process of ion strengthening. Further investigations on the ion strengthening of low-fusing porcelains should be carried out.
研究了三种长石质瓷的离子交换强化动力学。得出了描述处理时间和温度对弯曲强度影响的数据。温度效应结果支持扩散和松弛这两种相反现象控制残余应力的假设。时间效应结果表明，菲克扩散定律和扩散蠕变控制弯曲强度。提出了相关机制。这些发现表明，在这个离子强化过程中，精确控制温度比控制时间更为关键。应进一步开展低熔瓷离子强化方面的研究。
