Mullite-corundum deflecting yoke core frame for burning and preparation thereof

Abstract

The invention discloses a mullite-corundum deflecting magnetic-core burning bearing base, which is made by additionally adding a mineralizing agent into the raw materials to be sintered, wherein the raw materials includes 35 to 45 weight percentages of electric melting corundum, 25 to 35 weight percentages of electric melting mullite, 20 to 30 weight percentages of Suzhou clay and the rest weight percentages of alpha-Al2O3 fine powder. The additionally-added mineralizing agent comprises MgCO3 and BaCO3, wherein the MgCO3 accounts for 3 to 8 weight percentages of the total weight of the raw materials, and the BaCO3 accounts for 1 to 3 weight percentages of the total weight of the raw materials. Because the MgCO3 fine powder is added, when the MgO of equal amount is introduced, the adding amount is increased by one time. After the MgCO3 is decomposed into MgO, the fine powder has uniform distribution and high activity and has easy in-situ reaction with Al2O3 and SiO2 in the clay to generate dichroite. The decrease of the linear expanding coefficient and micro air holes formed by the decomposition of MgCO3 are helpful for improving the heat vibration stability. The dichroite generating amount in the burning bearing base can be controlled through controlling the addition amount of the MgCO3 and the service life of the burning bearing base can be greatly prolonged.

Description

technical field [0001] The invention belongs to the field of material manufacture, and relates to the preparation of a deflection magnetic core setter, in particular to a preparation and manufacturing method of a fired mullite-corundum deflection magnetic core setter. Background technique [0002] Most of the key equipment and instruments for the production of deflection magnetic cores in my country were imported from abroad in the 1990s, including the push plate and setter used for firing. By the mid-to-late 1990s, the production had begun to take shape. Among them, the 4390 factory in Shaanxi Province (later restructured as Shaanxi Jinshan Electric Group Co., Ltd.) was the largest, accounting for about one-third of the country's total output. In recent years, my country has become a major producer and exporter of deflection cores in the world. Due to its advantages in raw materials, production costs and economies of scale, Japan, South Korea, Southeast Asian countries, the...

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