( 1. 西安交通大学 金属材料强度国家重点实验室，西安 710049；
2. 西安理工大学 材料科学与工程学院， 西安 710048)
摘 要: 通过差热分析确定了含Cr量分别为0， 0.25％， 0.5％， 1.0％， 2.0％， 4.0%(摩尔分数)的CuMnCr合金的熔化温度。 采用座滴法测量了不同温度下不同Cr含量的CuMnCr合金在石墨表面的铺展面积和接触角。 在真空气氛中Mn的蒸发引起CuMnCr合金在石墨表面的润湿性随温度变化而变化， 不同Cr含量的CuMnCr合金在石墨表面的接触角在960 ℃时最小。 不同Cr含量的合金在不同温度下表现出最佳的铺展面积， 随含Cr量的增加界面反应层的厚度增加。 通过X射线衍射分析不含Cr和含Cr的合金界面反应产物分别为Mn7C3和CrxCy。
关键字: 座滴法； CuMnCr合金； 润湿性； 石墨
（ 1. State Key Laboratory of Mechanical Behavior for Materials,
Xi'an Jiaotong University, Xi'an 710049, China;
2. Department of Materials Science and Engineering,
Xi'an University of Technology, Xi'an 710048, China）
Abstract: By thermal analysis (DSC) the melting temperatures of CuMnCr alloys were decided and the sessile drop method was used to study the wetting behavior of CuMnCr series alloys on graphite surface. The results show that the wetting behavior of CuMnCr alloy is different from that of the other alloys due to the volatilization of Mn in the vacuum atmosphere, and with a certain Cr content the alloy has the optimal wetting behavior, i.e. the minimum contact angle at 960 ℃. The interface thickness is increased along with the amount increasing of Cr in the CuMnCr alloy. The XRD analysis indicate that the interface reaction productions between graphite and CuMnCr alloy are Mn7C3 and CrxCy, respectively.
Key words: sessile droplet; CuMnCr alloy; wetting behavior; graphite
