Refractory materials are often subjected to thermal shock and molten salt erosion during use. It is particularly important to study the degree of improvement in thermal shock resistance and molten salt erosion resistance of refractories after laser processing. After several cycles, cracks and peeling did not occur in the remelted layer. Even after the sample was cracked on the surface after laser treatment, the number of cracks did not increase except for a slight increase in crack width after the thermal shock test. Therefore, the laser treatment did not affect the thermal shock resistance of the refractories. After the laser treatment, there are specimens with surface cracks. Molten salt will invade along the crack, which will have an adverse effect on the erosion resistance of the refractory material. It can be seen that the laser surface treatment can significantly improve the anti-erosion performance of the refractories under the premise of ensuring the performance of the substrate is not affected, and has unique advantages compared with the traditional process, and is a method for improving the surface properties of the refractories. The way to the future. After treatment with HPDL laser, the cross-section was acicular dendrites and the dendrite orientation was disordered. Observed from the longitudinal direction, the morphology of the surface is dendrites arranged in a certain orientation. The growth direction of the dendrite is from the edge of the laser scanning path to the center, and it is at a certain angle with the scanning direction.
When the two solidification interfaces meet, the solidification process ends. If the laser power is low and the melting layer is shallow, the solidification caused by heat conduction through the substrate is so fast that the surface solidification process caused by air thermal conduction is suppressed. Refractory surface modification is a new problem brought forward by the development of the metallurgical industry, and the laser surface modification technology has the unparalleled advantages of the traditional process. In the future development, the laser surface modification of refractory materials will arouse the interest of researchers and metallurgical enterprises.
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