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采用烧结破碎法对Ti和B4C反应喷涂粉末进行了处理。制备的粉末经反应等离子喷涂制备了TiN基陶瓷涂层,并对涂层的微观形貌、物相、显微硬度以及在3.5wt%NaCl溶液中的极化行为进行了分析。结果表明,经900℃真空压块烧结粉末制备的涂层致密,涂层厚度达250μm,显微硬度显著提高。与碳钢相比,TiN基陶瓷涂层在3.5wt%NaCl溶液中自腐蚀电位发生正移,钝化区较宽,在很宽的电位范围内电流密度较低,耐蚀性优异。
Ti and B4C were sprayed by sintering method. The prepared powders were prepared by reactive plasma spraying TiN-based ceramic coatings, and the coating morphology, phase, microhardness and polarization in 3.5wt% NaCl solution were analyzed. The results show that the coating prepared by vacuum sintering at 900 ℃ has a dense coating with a coating thickness of 250μm and a marked increase of microhardness. Compared with carbon steel, the TiN-based ceramic coating has positive self-corrosion potential in 3.5wt% NaCl solution, wide passivation area, low current density and excellent corrosion resistance in a wide potential range.