Z箍缩用连续型直径周期调制钨丝的制备技术

Preparation of continuous W wire with modulation diameter shape for Z-pinch

利用研制平台、激光衍射直径在线表征设备、扫描电子显微镜及力学性性能测试设备等对超细钨丝的直径周期调制成型过程及单丝性能进行研究。结果表明，正电压与零电压交替出现的电解腐蚀方法可以用于制备连续型直径周期调制钨丝；电解电压1．4V和1．6V下，100～500g·L^-1的NaOH体系下，钨丝均能表现出较明显的直径周期调制形貌；电解电压更高时，只有当NaOH浓度低于500g·L^-1时，钨丝才能呈现周期调制的形貌。钨丝电解抛光的质量损失与电流强度和腐蚀时间存在正比关系，在特定条件下超细钨丝的重量损失与电流强度、电解时间二者乘积的比值为5．35×10^-5g·C^-1。在电解液质量浓度200g·L^-1，电解电压2．0V下，以3S的腐蚀时间制得的直径调制钨丝的粗段直径为12．2μm，细段直径为9．8μm，减径率约20％，其单丝断裂力可达0．2883N。

Preparation course and wire properties of ultra-fine W wire with modulation diameter were studied by using the preparation device,laser-diffraction device for on-line diameter measurement,and the SEM and mechanical property test.It was showed that alternate of electrolyzation voltage and'zero'voltage could be a feasible way for preparing continuous W wire with modulation diameter shape.The modulation shape of W wire was obvious in the system of(100-500)g·L-1 NaOH electrolyte with 1.4Vand 1.6Vvoltage.Corresponding modulation shape could be achieved in NaOH electrolyte of concentration less than500g·L-1,when electrolyzation voltage was high.The relationship of direct ratio between loss weight of tungsten wire and the product of current intensity and electrolyzation time in the preparing process of ultra-fine tungsten wire by electrochemical corrosion technology was deduced and examined.The value of direct ratio could be 5.35×10-5 g·C-1 in some certain condition.The thick segment diameter was 12.2μm,the thin segment diameter 9.8μm,and the ratio of diameter reduction was about 20% with experiment parameters of electrolyte density of 200g·L-1,a voltage of 2.0Vand an electrolysis time of 3s.Fracture force of such modulation W wire was 0.288 3N.