水平连铸结晶器铜合金内套表面强化工艺及性能研究
Surface Strengthening Process and Properties of Cu Alloy Mold of Level Continuous Caster
洪 昌1, 朱才进1, 谢春生1, 肖鸿光2
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作者单位：(1. 江苏科技大学 材料科学与工程学院, 江苏 镇江 212003; 2. 衡阳华菱连轧管有限公司, 湖南 衡阳 421001)
中文关键字：电弧喷涂； CuCo2Be合金； 正交试验； 结合强度
英文关键字：arc spraying; CuCo2Be alloy; orthogonal experiment; anchoring strength
中文摘要：选用Ni-Cr-Ti线材作为电弧喷涂材料，通过正交试验法，对用来制作水平连铸结晶器内套的CuCo2Be铜合金进行表面强化改性工艺试验。利用金相显微镜、扫描电镜、能谱仪等设备研究了电弧喷涂工艺对涂层微观组织及涂层与基体的结合强度、 涂层的显微硬度及热震性能的影响。 结果表明： 在喷涂空气压力不变的情况下， 当喷涂电压35 V、喷涂电流140 A、喷涂距离150 mm时，涂层结合强度达到34.1 MPa，热震41次后涂层没有出现裂纹或剥落，微观组织呈层状结构特征，涂层的显微硬度390.65 HV，且具有较好结合强度和耐热性能。
英文摘要：Taking Ni-Cr-Ti wire as spraying material, Ni-based coating was prepared using arc spraying system. The arc spraying process was optimized by orthogonal experiment design with the utilization of anchoring strength and using strength level as the criterion. The optimized process parameters of the arc spraying Ni-Cr-Ti coating were obtained. The effects of arc spraying process on microstructure, achoring strength between matrix and coating, hardness, thermal shock resistance of the coating were tested. The microstructure of the coating was studied by SEM, EDS. The results show that the optimized processing parameters of the arc spraying Ni-Cr-Ti coating are spray current 140 A, spray voltage 35 V and spray distance 150 mm. Spray voltage, spray current, spray distance have different effect on the anchoring strength of Ni-Cr-Ti coating under constant air pressure, and the higher the anchoring strength, the better the thermal shock resistance. The highest strength 34.1 MPa of Ni-Cr-Ti coating can be obtained using the optimized parameters, and the coating has no cracks or spalling after thermal shock 41 times. The coating displays good properties, has the typical layer structure characteristic and good thermal shock resistance, the highest hardness reaches 390.65 HV.