采用高速火焰喷涂技术以及等离子喷涂技术制备了Fe-Ni-B涂层.利用扫描电子显微镜(SEM)、X射线荧光光谱仪(EDX)分析了粉末以及涂层的微观结构、涂层到基体的成分分布.利用X射线衍射(XRD)分析了喷涂态的涂层物相.并对涂层的结合强度及抗热震性能进行了试验研究.研究结果认为:等离子喷涂层组织更为致密,但其热喷涂涂层存在的层状结构也更加明显.熔融液滴在涂层表面的平铺效果都比较好.Fe、Ni元素的分布从涂层到基体基本成均匀分布,避免了局部元素偏析所造成的应力集中.热震后,等离子喷涂涂层中的裂纹分布细小且无规律.高速火焰喷涂涂层裂纹主要集中在涂层与基体结合部位.根据材料抗热震性能的能量理论和弹性理论,等离子喷涂涂层的抗热震能力更强.并且涂层的断裂失效主要产生在结合部位.
Fe -Ni -B coatings were sprayed by plasma spraying and high-velocity flame spraying. Morpholo-gies of the powder and coatings were analyzed by SEM, and chemical composition of the coatings to base was analyzed by EDX. The phase of the coatings was analyzed by XRD. The properties of tensile strength and ther-mal shock resistance of two coatings were investigated as well. Results show that the plasma sprayed coatings show dense microstructure, and the lamellar structure in the thermal spray coatings is obvious. The distribution of Fe and Ni is even from the coatings to base, which avoids the stress centralization. The micro-cracks in the plasma sprayed coatings are tiny and in disorder, while those in the high-velocity flame sprayed coatings main-ly concentrate in the contact area. According the energy theory and elasticity theory, the thermal shock resist-ance of plasma sprayed coatings is better, and their failure mainly occurs in the contact area.
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