In 2001, the electronic industry standard SJ/T11260-2001 of the People's Republic of China gave the tolerance range of the diameter, flatness, roundness, etc. of the ceramic shell for vacuum switch tubes. Our factory has also formulated corresponding inspection standards based on this standard. In our factory qualified suppliers generally only 5% of the size, shape failure, and some manufacturers up to 30% to 40% failure rate, and the size of the distribution is not the law, the consistency is poor. Size, tolerance on the shape of the assembly, especially for processes using a closure row manufacturers will cause difficulties in positioning and lay hidden ensure concentricity, air-tightness of the whole pipe, thereby reducing the reliability of the product . In order to ensure the precision of the size and shape of the porcelain shell, it is necessary to strengthen the control and management of various processes for the production of porcelain pieces, including raw material processing, slurry preparation, molding, wax removal, and firing processes.
Sealing surface of the sealing surface defects as the ceramic member is a key component of ceramic fiber paper and a metal sealing member, it will directly affect the metal and the intrinsic quality of the sealing, the quality requirements for the various manufacturers are sealing surface Very strict. Our factory requires no cracks, air holes, scratches, pits, or interlayers on the sealing surface. Impurities in Porcelain The impurities in the porcelain are mainly derived from the raw materials and process. Some impurities are colored under an oxidizing atmosphere, such as Cr2O3, Fe2O3, TiO2, etc. Therefore, red, yellow, or black spots can be seen under the light, and some impurities are colorless.
The incorporation of these impurities will affect the electrical properties of the ceramic pieces, the glass wool roll felts increase the dielectric loss, and the withstand voltage level decreases. Therefore, porcelain manufacturers should strictly control the quality of raw materials and process. These are some of the problems in production testing occur more chance, these are pieces of porcelain manufacturers can control or improve some of the problems, how these issues is the need to control the manufacturers take seriously.
