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在H13钢离子氮化基体上沉积TiAlN镀层,在其表面形成渗镀复合层,研究渗氮基体不同表面预处理对渗/镀复合层微观形貌及承载能力的影响。用压痕和划痕试验综合检测膜基体系的承载能力,用扫描电镜和光学显微镜观测渗镀层厚度、表面和截面形貌。结果表明:H13钢渗氮处理后的表面抛光预处理有助于之后镀膜生长的镀层结构致密,渗氮引起的表面疏松层使得镀层的表面缺陷增多、晶柱露头尺寸不均匀。H13钢渗氮表层形成的高硬度和平缓的硬度梯度,能有效地抑制压入承载时镀层的开裂剥落失效。渗氮基体表面未经抛光去除疏松层预处理的试样,划擦时镀层易产生剥落失效,抗划擦能力下降。
The TiAlN coating was deposited on the H13 steel ion nitriding substrate, and the infiltration composite layer was formed on the surface of the H13 steel ion nitriding substrate to study the effect of different surface pretreatment on the microstructure and bearing capacity of the infiltration / plating composite layer. The bearing capacity of the film-based system was measured by indentation and scratch test. The thickness, surface and cross-sectional morphology of the coating were observed by scanning electron microscopy and optical microscopy. The results show that the pretreatment of the surface after nitriding treatment of H13 steel is helpful for the subsequent coating growth. The surface loose layer caused by nitriding increases the surface defects of the coating and the uneven outcrop of the crystal. H13 steel nitrided surface hardness and hardness of the formation of the hardness gradient, which can effectively inhibit the press-bearing coating cracking cracking failure. The surface of the nitriding substrate is not polished to remove pre-treated samples of the loose layer, scratch the coating prone to flaking failure, scratch resistance decreased.