型壳面层材料与DZ125定向凝固高温合金的润湿性及界面反应

Wettability and interfacial reactions of shell surface layer materials with DZ125 directional solidification superalloy

摘要

采用座滴法对比研究EC95粉面层、刚玉粉面层和锆英粉面层3种陶瓷型壳面层材料对于DZ125定向凝固高温合金的高温化学稳定性及润湿性。观察分析陶瓷表面形貌及其与合金熔体界面反应形貌及组成，计算合金熔体与陶瓷之间的润湿角，分析讨论界面反应及润湿性与铸件表面机械粘砂之间的影响关系。结果表明：EC95粉面层、刚玉粉面层和锆英粉面层3种陶瓷型壳的表面粗糙度分别为3.987、3.391 μm和2.085 μm；合金与3种陶瓷的界面反应产物均以Hf的氧化物为主，伴有少量合金成分；对于刚玉面层陶瓷，实验后合金表面几乎完整覆盖一层Hf的氧化物，该氧化物层阻止合金与陶瓷面层的进一步反应，因而更适用于DZ125合金的熔模铸造；DZ125合金与EC95粉面层、刚玉粉面层和锆英粉面层陶瓷的润湿角分别为84.95°、75.71°和132.96°，受界面反应和陶瓷表面粗糙度的影响，刚玉面层型壳与DZ125合金的润湿性更好。

Abstract

The high-temperature chemical stability and wettability of EC95 powder surface layer, corundum powder surface layer, and zirconium powder surface layer of ceramic shell to DZ125 directional solidification superalloy are comparatively studied by the sessile-drop experiment. The morphology of ceramic surfaces as well as the morphologies and compositions of the interfacial reaction zones between the ceramics and the alloy melt are observed and analysed. The contact angles between the alloy melt and the ceramics are calculated, and the influence of interfacial reactions and wettability on the mechanical penetration defect of the casting surface are discussed. The results show that the surface roughness values of EC95 powder surface layer, corundum powder surface layer, and zirconia powder surface layer ceramics are 3.987, 3.391 μm, and 2.085 μm, respectively. The interfacial reaction products between the alloy and the three types of ceramics are mainly composed of Hf oxides, accompanied by a small amount of alloying components. For the corundum powder surface layer ceramics, the alloy surface is almost completely covered by a layer of Hf oxide after the experiment. This oxide layer effectively inhibits the further interfacial reaction between the alloy and the ceramic surface layer, making it more suitable for the investment casting of DZ125 superalloy. The contact angles between DZ125 superalloy and EC95 powder surface layer, corundum powder surface layer, and zirconia powder surface layer are 84.95°, 75.71°, and 132.96°, respectively. Due to the influence of interface reactions and ceramic surface roughness, the wettability between corundum surface layer shell and DZ125 alloy is better than other surface layers.

关键词

熔模铸造 / DZ125定向凝固高温合金 / EC95粉面层 / 刚玉粉面层 / 锆英粉面层 / 界面反应 / 润湿性

Key words

investment casting / DZ125 directional solidification superalloy / EC95 powder surface layer / alumina powder surface layer / zircon powder surface layer / interfacial reaction / wettability

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