Progress in the application of cold gas dynamic spraying to repairing continuous casting molds

作     者：ZHANG Junbao LIANG Yongli ZHANG Huabin 

作者机构：Advanced Technology Division Research Institute Flaoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Silicon Steel Department Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200941 China 

出 版 物：《Baosteel Technical Research》 (宝钢技术研究（英文版）)

年 卷 期：2011年第5卷第1期

页      面：17-23页

学科分类：080503[工学-材料加工工程] 082304[工学-载运工具运用工程] 08[工学] 080204[工学-车辆工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 0823[工学-交通运输工程] 

主　　题：cold gas dynamic spraying (CGDS) continuous casting mold repairing coating microstructure mechanical property 

摘      要：A new continuous casting mold repairing method--cold gas dynamic spraying （CGDS） is introduced. The study investigates the advantages of the CGDS process regarding repairing operation, such as convenient, in-situ repairation,little heat delivery, microstructural and dimensional stability and other special applications. Microstructure and mechanical properties of the copper alloy coating, nickel coating, ceramic composite coating, and their interface to the substrates ,which are usually used in repairing operation have been researched by means of optical microscopy （ OM）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and micro-hardness tests. Experimental results have demonstrated the relative density of the copper alloy coating is as high as 98.7%, and that no obvious difference can be observed between the CrZrCu substrate and the Cu alloy coating in terms of microstructures; thus the interface is quite difficult to be identified. The bonding strength and micro-hardness of the Cu alloy coating reach up to 37 MPa and 310 HV0.2 ,respectively. The interface between the copper alloy coating and the nickel coating is either zigzag or wave shaped, and the cohesion is relatively good. As-sprayed nickel coating is dominated by severely deformed particles,and the relative density is up to 98.5%. Complete recrystallization occurred after annealing at 900℃ for one hour,while its micro-hardness remains as high as 124.1 HV02. All these results have indicated that CGDS is a promising technology for repairing the continuous casting mold and that its future development is prosperous as well.