印染过程中印花镍网的抗拉强度直接影响圆网印花机的使用寿命,制备高性能的镍网是获得较大经济效益的关键.通过X射线衍射、扫描电镜等材料分析方法对不同工艺参数下的圆筒印花镍网进行显微结构分析,并对其力学性能进行对比.结果表明:圆筒印花镍网中镍的质量分数达99.79％且为面心立方结构;镍网的一镀镀层没有出现分层现象,二镀镀层出现明显的分层现象;不同种类的圆筒印花镍网的晶粒取向不同;80目镍网试样一镀镀层断口形貌较平齐并有强烈的金属光泽,为典型的脆性断裂,二镀镀层呈韧性断裂,125目和195目镍网试样呈典型的韧性断裂,且195目镍网试样二镀镀层韧窝较深,与一镀镀层差异较大,125目镍网试样一镀、二镀镀层韧窝无明显差别,同时该试样抗拉强度为785 MPa,抗拉强度明显优于其他试样;由于氧化膜的存在,一镀镀层与二镀镀层之间的结合性能较差,导致拉伸过程中镀层界面产生开裂,同时降低镍网抗拉强度.%In the process of printing and dyeing,the tension strength of cylinder printing nickel screen will directly affect the service life of the cylinder screen printing machine and the key to obtain high economic benefit is to produce high-performance cylinder printing nickel screen.By means of X-ray diffraction and scanning electron microscopy,the microstructure of cylinder printing nickel screen with different plating processes was analyzed and their mechanical performance was compared with each other.The result showed that the mass-fraction of the nickel will be 99.79％ with face centered cubic structure of nickel screen.There would be no delamination in the single-plating coating of nickel screen but a remarkable delamination would take place in the double-plating coating of nickel screen.The fracture morphology of 125-mesh and 195-mesh nickel screen samples would exhibit typical toughness fracture and the doubleplating coating of 195-mesh nickel mesh would have deeper toughness pits.The tension strength of 125-mesh nickel screen sample would be 785 MPa,being obviously superior to other samples in that.Due to the existence of oxide film,the bonding capacity of single-plating coating to double-plating one would be worse,that reducing the tension strength of the nickel screen.
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