基于多材料打印制备梯度结构电解电容器阳极块

Fabrication of Gradient Electronlytic Capacitors Anode Pellet Based on Multi-material Printing

摘要:

高功率密度固体钽电容器阳极块的设计、加工和制造是当前研究的热点和难点。实验借助多材料浆料直写成型3D打印技术制备具有梯度结构的固体钽电容器阳极块。研究了阳极块打印制备工艺,分析了浆料配比、挤出量、层间距、打印速度等对成型效果的影响。结果表明,用钽粉、粘结剂PVA(聚乙烯醇)和溶剂水(配比为7.5:1:5)配制的浆料在打印速度为3mm/s,气压为765KPa,打印针孔内径0.84mm,层间距0.5mm的条件下,通过模型设计、打印浆料配置、双喷头打印、引线插入(焊接)、矫形、烧结和化成等工艺,制备出的具有梯度结构的阳极块形状规整,均匀,其收缩率在9.7％-14.5％之间,单位质量的CV达到53200μF.V/g,相比同类产品增加了15.6%,基本达到工业化生产需求。该技术是现有加工制备技术的有益补充,是对高功率密度和能量密度电解电容器阳极块制备技术的有益探索。

Abstract:

The design, processing and fabrication of high energy density and power density solid tantalum capacitor anode blocks are the hotspots and difficulties in current research.In the experiment, the anode block of tantalum capacitor with gradient structure was fabricated by using the direct writing 3D printing technology of multi-material slurry.The preparation technology of anode block printing was studied, and the influences of size ratio, extrusion amount, layer spacing and printing speed on the forming effect were analyzed.The results showed that the slurry prepared with tantalum powder, binder PVA (polyvinyl alcohol) and solvent water (ratio: 7.5:1:5) had a printing speed of 3 mm/s, a gas pressure of 765 KPa, and a print pinhole inner diameter of 0.84. Mm, layer spacing of 0.5mm, through the model design, print slurry configuration, dual nozzle printing, wire insertion (welding), orthopedic, sintering and chemical conversion processes, the anode block shape with gradient structure is regular and uniform The shrinkage rate is between 9.7% and 14.5%, and the CV per unit mass is 53200μF.V/g, which is 15.6% higher than that of similar products, which basically meets the industrial production demand. This technology is a beneficial supplement to the existing processing and preparation technology, and is a useful exploration of the high power density and energy density electrolytic capacitor anode block preparation technology.