Technical application of high-precision thick film printing technology in electric vacuum ceramic tube shells

Electric vacuum ceramic tube shell is a key electronic component shell. Due to its characteristics of high temperature resistance, corrosion resistance, excellent insulation performance, high vacuum degree, and high mechanical strength, it is widely used in packaging high-end semiconductor components, national defense and military industries, Electric power transmission and industrial power devices, such as electric vacuum tube switches, high-frequency high-power electron tubes and large-scale integrated circuits.

Structure and preparation process of electric vacuum ceramic tube shell
The electric vacuum ceramic tube shell is composed of a ceramic tube and a metallized coating. The preparation process is complicated, and any negligence in any link will cause defects in the product. At present, most domestically produced small tubes with diameters less than 180 mm are mostly produced in China, and most of the large-diameter electric vacuum tubes required by the market rely on foreign imports. Its main process includes ceramic powder batching, molding, high-temperature sintering, metallization and glaze firing. Among them, metallized coating is the key to sealing. It needs to ensure the air tightness and tensile strength required for sealing. Therefore, the thickness of the metal coating film is required to be uniform and consistent.

Technical application of high-precision thick film screen printing technology in electric vacuum tubes
1. Technical advantages
As a method with relatively simple process, low cost and high efficiency, thick film screen printing has been widely used for metallization of electric vacuum ceramic tube shells. Compared with manual coating, thick film screen printing can ensure uniform film thickness and high efficiency in batch printing, thus meeting the high requirements for metallized coatings of electric vacuum ceramic tube shells.
2. Process details
1. Printing environment: The printing environment should be kept clean and dust-free to ensure printing quality.
2. Printing part requirements: When printing molybdenum-manganese slurry on one or both ends of the electric vacuum ceramic tube shell, the printing coating film thickness is required to be uniform, the slurry does not sag to the inner and outer walls, and there are no burrs, pinholes, or white spots. 's appearance.
3. Screen requirements: Use composite screens to meet the requirements for printing accuracy and coating uniformity.
4. Printing equipment: Use high-precision thick film screen printing machines, such as IC-340B, etc., and customize vacuum switch tube housing fixtures to ensure printing accuracy and stability.
At the same time, in order to meet customers' mass production, thick film printing companies have also customized fully automatic printing production lines for customers, including manual loading and unloading positions - preheating loading unit - printing unit - baking unit - cooling unit, which can meet the needs of multiple sizes ( Diameter ∅5mm-350mm, height 5mm-240mm) electric vacuum ceramics are printed at the same time. The printing unit adopts a lifting platform to ensure efficient and stable printing; the printing head adopts suspended printing to ensure stable printing pressure and uniform printing film thickness.
5. Drying: Dry after printing is completed to ensure that the coating is firmly attached to the surface of the ceramic tube.
With the rapid development of science and technology and the continuous growth of market demand, the application fields of electric vacuum ceramic tubes and shells will become more extensive. Thick film printing companies should continue to adhere to technological innovation and process upgrading, and provide more high-precision, high-efficiency thick film screen printing equipment and technical support for the electric vacuum ceramic tube and shell industry. At the same time, cooperation and exchanges with upstream and downstream enterprises should be strengthened to jointly promote the sustainable development of the electric vacuum ceramic tube and shell industry.
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