Double-copper-electrode rectifying tube chip made of coated environment-friendly material, and coating process

Abstract

The invention relates to a process structure with a double-copper-electrode rectifying tube chip coated made of a coated environment-friendly material. Rectifying tube chip products about multiple contradictions, such as the quality, the cost, the resource consumption and the environment protection, can be well coordinated. The process structure has the advantages of low production cost of the conventional lead-surface process structure product and high electrothermal performance of a silver-coated double-copper-electrode product, is environment-friendly during production, does not waste noble metal and is a great technical innovation during production of the rectifying tube chip home and abroad within recent 20 years. A solid structure of the product consists of a silicon slice (1) with a rectification characteristic, a brazing layer (2), copper electrodes (3), a coated environment-friendly material layer (4) and insulative protection rubber (5).

Description

technical field [0001] The invention relates to a process structure design of a rectifier tube chip with double copper electrodes coated with environmental protection materials, which belongs to the semiconductor manufacturing technology. Background technique [0002] The rectifier chip is the basic unit product of electronic components, widely used in fields such as converters, metallurgy, automobiles, power generation, automation control and household appliances, and has a large market demand. According to industry survey data, the current annual production and sales of rectifier chips with a rated current of 3 to 100A in my country are about one billion. With the development of the economy and the popularization of automation, the market demand is still increasing at a rate of about 10% per year. [0003] Since the 1990s, the process technology for producing rectifier chips has been improved many times and has basically become mature. However, further improving product ...

AI Technical Summary

Problems solved by technology

The disadvantages are: due to the poor electrical and thermal conductivity of ferrous metals or Kovar alloys, the electrical and thermal conductivity of the product is affected; moreover, because it must be wrapped with lead-tin, the formula ratio of lead-tin is 95:5, a large amount of heavy metals Lead is exposed on the surface of the product, which brings major pollution risks to the environment

The disadvantage is: due to the use of precious metal silver as the coating of copper electrodes, the process cost is very high, and the production cost of products with the same rated current specification is 40% higher than that of traditional process products; Silver will be a great waste of rare resources, which is not conducive to the sustainable development of human beings; when plating silver, more cyanide is used, which is highly toxic, difficult to treat, and has serious pollution to the environment

Since the process structure was introduced from Taiwan to the mainland at the end of the last century, there has been no qualitative improvement so far.

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