Improvement in the microstructure and property of plasma sprayed metallic, alloy and ceramic coatings by pre-/during-treatment of dry-ice blasting
Improvement in the microstructure and property of plasma sprayed metallic, alloy and ceramic coatings by pre-/during-treatment of dry-ice blasting
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DOI：
10.1016/j.surfcoat.2012.03.071
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发表时间：
2013-04
影响因子：
5.4
通讯作者：
S. Dong;B. Song;B. Hansz;H. Liao;C. Coddet
中科院分区：
文献类型：
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作者：
S. Dong;B. Song;B. Hansz;H. Liao;C. Coddet
为了改善等离子喷涂涂层的组织和性能，将干冰喷射引入等离子喷涂中作为基体过冷系统。在这项研究中，钢，CoNiCrAlY和Al 2 O3涂层沉积等离子喷涂耦合的预/期间处理的干冰喷射。此外，干冰喷射作为预处理/处理过程中的效果和仅在处理过程中进行了检查，以发现在热喷涂过程中使用干冰喷射的更好方法。结果表明，在等离子喷涂过程中采用干冰喷射可以获得致密的钢或CoNiCrAlY合金涂层，且氧化物含量较低。这种氧化物含量的降低主要归因于干冰颗粒的更好的冷却效果。有趣的是，还发现在基底上进行干冰喷射的预处理可以帮助获得具有改善的粘附力的金属、合金甚至陶瓷涂层。与传统空冷工艺相比，钢、CoNiCrAlY和Al 2 O3涂层的结合强度分别提高了14%、5%和30%。干冰喷射的清洁效果是提高粘结强度的主要原因。基于目前的研究，干冰喷射可以作为等离子喷涂过程中的预处理和冷却系统。
Dry-ice blasting was introduced into plasma spray as substrate's under-cooling system to improve the microstructure and property of coatings. In this study, steel, CoNiCrAlY and Al2O3coatings were deposited by plasma spray coupled with the pre-/during-treatment of dry-ice blasting. Moreover, the effect of dry-ice blasting as a pre-/during-treatment and only the during-treatment was examined to discover a better way to use dry-ice blasting during thermal spraying. It is revealed that a denser steel or CoNiCrAlY alloy coating with a lower content of oxide can be achieved with the application of dry-ice blasting during the plasma spraying. Such decrease of the oxide content is mainly attributed to the better cooling effect of dry-ice pellets. Interestingly, it is also found that the pre-treatment of dry-ice blasting on the substrate can help to get metallic, alloy and even ceramic coatings with improved adhesions. The adhesive strengths of steel, CoNiCrAlY and Al2O3coatings were increased by 14%, 5% and 30%, respectively, compared with those of the coatings deposited with conventional air cooling. The cleaning effect of dry-ice blasting is responsible for the increase of the adhesive strength. Based on the present study, dry-ice blasting can be proposed as a pretreatment and cooling system during plasma spray.