研究了Hf对一种高温合金与陶瓷材料润湿性及界面反应的影响. 测量了合金熔体与陶瓷材料的平衡润湿角, 通过SEM, EPMA和XPS研究了合金与陶瓷材料的界面组织形貌、反应区元素分布及界面反应产物, 分析了Hf对合金熔体与陶瓷材料润湿性及界面反应的影响, 阐述了润湿性与界面反应的关系. 结果表明, 高温合金中Hf元素的含量会影响合金熔体与陶瓷材料的润湿性. 对于本工作的合金, 当Hf含量从0.1%逐渐增大至2.0%时, 润湿角由132°逐渐减小至112°, 润湿性显著增强; 当Hf含量达到1.5%时, 合金熔体与陶瓷材料发生界面反应, 界面反应使润湿角明显减小, 反应产物为HfO₂. 界面反应热力学分析结果表明, Hf和SiO₂满足发生置换反应所需的热力学条件.

The influence of Hf content on the wettability and interfacial reaction between a nickel base superalloy and a ceramic material was investigated by using a sessile drop method. The wetting angle was measured through the geometric parameters of the metal drop. The interfacial morphology and elements distribution were studied by SEM and EPMA, respectively. XPS was employed to study the phase formation at the metal-ceramic interface. The relationship between wettability and interfacial reaction was discussed. It was found that the wetting angle of the metal drop on the ceramic substrate was decreased with increasing Hf content in the alloy and the wettability of the studied superalloy on the ceramic material was enhanced with increasing Hf content in the alloy. When the content of Hf increased from 0.1% to 2.0% (mass fraction), the wetting angle decreased from 132° to 112°. The interfacial reaction led to a sharp decrease in wetting angle as Hf content was 1.5%. The product of interfacial reaction was HfO₂ and the thermodynamic analysis indicated that Hf was able to substitute Si in SiO₂ in the ceramic material.