{"id":15405,"date":"2017-03-16T10:03:47","date_gmt":"2017-03-16T02:03:47","guid":{"rendered":"http:\/\/www.seeedstudio.com\/blog\/?p=15405"},"modified":"2020-08-27T15:04:31","modified_gmt":"2020-08-27T07:04:31","slug":"pcb-etching","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2017\/03\/16\/pcb-etching\/","title":{"rendered":"PCB Etching Technique and Analysis of Etching Solution"},"content":{"rendered":"With the development of the PCB industry, the impedance requirements of various wires have become higher and higher, which inevitably requires stricter control of the width of the wires. In industrial production, the quality of PCB is getting better and better, and the reliability is getting higher and higher; but the design process is becoming more and more diversified and more perfect. The use of etching technology in PCB processing and assembly is becoming more and more widespread.\n

What is etching technique<\/h2>\nThe etching technique is a technique for selectively etching or stripping the surface of the semiconductor substrate or the surface covering film in accordance with the mask pattern or design requirements in the semiconductor process. Etching techniques can be divided into wet etching and dry etching, chemical solution used in wet etching through chemical reactions in order to achieve the purpose of etching, dry etching is usually a plasma etching, its effect may be the impact chips by plasma surface physics, or possibly a plasma activated chemical reaction between base and surface atoms, or even role may be a composite of the two.\n

Wet etching<\/h2>\nWet etching is a technique in which etching materials are immersed in an etching solution for etching. It is the most common etching method. There are three factors that affect the etching rate of the etched object: etching solution concentration, etching solution temperature, and stirring. Qualitatively speaking, increasing the etching temperature and adding stirring can effectively increase the etching rate; The characteristic of wet etching is isotropic.\n\n\"\"<\/a>\n