Abstract The surface strengthening by ion exchange technology was used to improve the strength of thin building tiles. The effects of exchange time, exchange temperature, and content of KOH additive on strengthening of building tiles were investigated by analyzing the flexural strength and distribution of K+ in the samples. The results showed that the addition of .3 mol KOH to the molten salt of industrial KNO3 at 450°C for 5 h resulted in a maximum flexural strength of 86.53 MPa, which was 50.3 higher than that of the sample without ion exchange and 8.9 higher than without KOH addition. After ion exchange, the concentration of K+ ion in cross‐section of the sample decreased with increasing distance from the sample surface, and the diffusion coefficient changed with the change of the content of KOH additive in the molten salt, increasing the diffusion coefficient of K+ ion from .93 × 10−15 to 1.8 × 10–15 m2/s by adding .3 mol KOH.
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