| The characteristics of high spectrum efficiency,high bandwidth,and large capacity in the era of 5G communications have promoted the multi-dimensional upgrading of electronic components.Solid tantalum capacitors will become special products in the 5G era capacitor market due to their small size,large capacity,high reliability,high frequency and high power.However,the traditional production process of solid tantalum capacitors has not been able to solve the problems of the increase in the content of a given volume and the formation voltage at the same time,and the defects in the manufacturing process of the anode block affect the performance,which hindered its development in the 5G era.Multi-material 3D printing technology can make up for the shortcomings of the traditional process of anode blocks,and can optimize the tantalum capacitor anode blocks in terms of materials and structure,improve the volume efficiency and electrical performance of tantalum capacitors,and achieve the ultra-small size and super-large of tantalum capacitors in the 5G era.Upgrade target for capacity and ultra-high power.In this dissertation,a solid tantalum capacitor anode block with a gradient structure is prepared using multi-material 3D printing technology.The preparation process is studied in detail,and the feasibility of this new process is verified by testing.The main contents of this paper are as follows:(1)Through the analysis of traditional manufacturing processes and the reading of related literature and patents,a digital model and printing preparation scheme of solid tantalum capacitor anode blocks with functional gradient structure are designed.The anode block is prepared by multi-material paste direct writing 3D printing technology.Its gradient structure is: around the end of the tantalum wire is printed by 70,000?F·V/g specific volume tantalum powder,and the periphery is made of 50,000?F·V/g specific volume tantalum powder Printed with a volume ratio of 1:6.(2)The preparation process and printing effect of printing paste for tantalum capacitor anode block were studied.Through the theoretical analysis and multiple groups of comparative experiments,a slurry configuration scheme was obtained.The mass ratio of the metal tantalum powder,polyvinyl alcohol,and deionized water was 7.5:1:5.The tantalum powder was stirred for 100 minutes,and after 0.08 MPa vacuum treatment,the printing effect of the prepared printing paste was better.(3)A multi-material printing process for the anode structure of the gradient structure was studied,and the defects of the traditional production process of the anode block of the solid tantalum capacitor were optimized.The pressure is 765 kPa,the inner diameter of the nozzle is 0.6mm,the printing speed is 3mm/s,the distance between each path is 0.6mm,and the distance between each layer is 0.5mm.After micro-orthogonal treatment,a better molding effect and dimensions Gradient structure anode block that meets requirements and is equipped with tantalum wire.(4)The performance test of the gradient structure anode block was performed by sintering,forming,and test volume.The test results show that the gradient structure anode block is sintered at 1400?,and the volume shrinkage of the anode block is measured between 9.7% and 14.5%.At 21 V,the sintered anode has an average CV per unit mass of about 53200?F·V/g,which is an increase of 15.6% compared with similar products.This paper is a useful attempt of 3D printing technology in the field of electronic component manufacturing.The innovative use of multi-material paste direct writing 3D printing technology to print a gradient tantalum capacitor anode block with a gradient structure meets the mechanical performance requirements in production.The unit mass CV value has increased by 15.6%,which will better meet high power and high frequency Requirements for the development of tantalum capacitors with communication technology.3D printed electronic component technology will be a useful complement to traditional production processes. |
PDF Full Text Request