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首页> 外文期刊>Journal of Thermal Spray Technology >MoB/CoCr Cermet Coatings by HVOF Spraying against Erosion by Molten Al-Zn Alloy
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MoB/CoCr Cermet Coatings by HVOF Spraying against Erosion by Molten Al-Zn Alloy

机译：熔融铝锌合金的HVOF喷涂抗腐蚀MoB / CoCr金属陶瓷涂层

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摘要

MoB/CoCr, a novel cermet material for thermal spraying, with high durability in molten alloys has been developed to utilize for aluminum die-casting parts, and for hot continuous dipping rolls in Zn and Al-Zn plating lines. The durability of the MoB/CoCr coatings prepared by high velocity oxy-fuel (HVOF) spraying has been investigated using a molten-metal immersion tester. The tests revealed that the MoB/CoCr coating has much higher durability without dissolution in the molten Al-45wt.%Zn alloy. Little change of crystal structure, mainly composed of double borides of CoMoB and CoMo2B2, is observed after the immersion test, suggesting that the double borides have much higher durability. Using undercoat is effective to reduce the influence of large difference in thermal expansion between the MoB/CoCr topcoat and substrate of stainless steel of AISI 316L, widely used for the hot continuous dipping rolls. Optimized thickness combinations of topcoat and undercoat are necessary to obtain intrinsic performance of low reactive MoB/CoCr against the molten Al-45wt.%Zn alloy.
机译：MoB / CoCr是一种新型的用于热喷涂的金属陶瓷材料，在熔融合金中具有很高的耐用性，现已开发出来用于铝压铸件以及Zn和Al-Zn电镀生产线中的热连续浸轧辊。使用熔融金属浸没测试仪研究了通过高速氧燃料（HVOF）喷涂制备的MoB / CoCr涂层的耐久性。测试表明，MoB / CoCr涂层具有更高的耐久性，并且不会溶于熔融的Al-45wt。％Zn合金中。浸渍试验后观察到晶体结构几乎没有变化，主要由CoMoB和CoMo2 B2 的双硼化物组成，表明该双硼化物具有更高的耐久性。使用底涂层可有效减少MoB / CoCr面涂层与AISI 316L不锈钢基材之间热膨胀差异很大的影响，AISI 316L不锈钢广泛用于热连续浸涂辊。为了获得对熔融Al-45wt。％Zn合金低反应性MoB / CoCr的固有性能，必须优化面涂层和底涂层的厚度组合。

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