CAJ | 학술논문

为了延长液芯大压下轧机轧辊使用寿命，提高厚板连铸连轧生产效率，从提高轧辊抗热冲击性出发，采用在轧辊表面喷涂氧化锆热障涂层的方法来提高轧辊抗热冲击性。通过对比实验，比较了等离子喷涂ZrO2-8%Y2O3涂层、激光熔覆ZrO2-8%Y2O3涂层试样的表面与截面形貌和抗热冲击性。实验结果表明：激光熔覆涂层气孔、裂纹等缺陷明显减少，涂层与轧辊基体结合强度显著增强；激光熔覆涂层提高轧辊的抗热冲击性较单纯等离子喷涂涂层轧辊提高了2.94倍。
위료연장액심대압하알궤알곤사용수명，제고후판련주련알생산효솔，종제고알곤항열충격성출발，채용재알곤표면분도양화고열장도층적방법래제고알곤항열충격성。통과대비실험，비교료등리자분도ZrO2-8%Y2O3도층、격광용복ZrO2-8%Y2O3도층시양적표면여절면형모화항열충격성。실험결과표명：격광용복도층기공、렬문등결함명현감소，도층여알곤기체결합강도현저증강；격광용복도층제고알곤적항열충격성교단순등리자분도도층알곤제고료2.94배。
In order to extend the liquid core heavy reduction mill rolls' life and improve the slab continuous casting and rolling pro-duction efficiency, ZrO2-8%Y2O3 thermal barrier coating can be sprayed on the surface of rolls to improve its thermal shock resis-tance. In this paper, the difference of surface&section morphology and thermal shock resistance between the sample with plasma sprayed ZrO2-8%Y2O3 coating and the sample with laser cladding ZrO2-8%Y2O3 coating are analyzed using comparative experi-ments. The analyzing results show that pores and cracks of the laser cladding coating decrease obviously. The bonding strength between the base and coating are increased significantly. The thermal shock resistance of rolls with laser cladding coating is incre-ased 2.94 times of that with plasma sprayed coating.