Method for remedying rejected manganese-zinc ferrites by using atmosphere heat treatment

A technology of manganese-zinc ferrite and qualified products, which is applied in the field of electronic components manufacturing process, can solve the problems of peak temperature deviation, unqualified product stacking, failure to achieve balanced atmosphere, etc., to achieve rational utilization of resources and reduce production costs Effect

Inactive Publication Date: 2012-09-26
宜宾盈泰光电有限公司
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Problems solved by technology

[0004] In actual sintering, because the height of billets loaded and the amount of billets loaded will affect the distribution of the atmosphere in the kiln, the change of air and nitrogen flow ratio, the change of kiln pressure, the removal of the truck cover and other factors may not meet the requirements of the balanced atmosphere. As a result, the peak temperature of some products II deviates, and the product stacking is unqualified

Method used

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Embodiment

[0010] Embodiment: a kind of method of rescuing manganese-zinc-ferrite unqualified product by atmosphere heat treatment, it is characterized in that: the manganese-zinc-ferrite unqualified product is processed in the furnace, starting from normal temperature, in pure nitrogen at an hourly rate The rate of 280°C rises to 1225°C, and then it is kept in an equilibrium atmosphere for 1.5 hours, and then cooled to room temperature in an equilibrium atmosphere, and the cooling rate is 125°C per hour; during the above process, when the temperature is below 900°C, it is filled with pure nitrogen , so that the oxygen content is lower than 50ppm (theoretically, the lower the oxygen content at this stage, the better), and the oxygen content in the equilibrium atmosphere of 900°C-1225°C is 3%; the control of oxygen content can be realized by filling nitrogen.

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Abstract

The invention relates to a method for remedying rejected manganese-zinc ferrites by using atmosphere heat treatment. The method is characterized in that the rejected manganese-zinc ferrites are treated inside a furnace, the temperature rises from the room temperature to 1200-1250 DEG, the temperature is retained for 1-2 hours, after the temperature drops to the room temperature, the rejected manganese-zinc ferrites are taken out from the furnace, when the temperature is below 900 DEG, the oxygen content is lower than 50 ppm, when the temperature is above 900 DEG, the oxygen content is 1-4%; the control of the oxygen content is realized by filling nitrogen gas. The rescuing method has the advantages that the prior rejected products can be effectively rescued through technical means, acceptable products then can be obtained, the production cost is reduced, the resources are rationally utilized, and the purpose of waste utilization is realized.

Description

technical field [0001] The invention belongs to the technical field of manufacturing technology of electronic components. Background technique [0002] Manganese zinc ferrite has a spinel lattice structure, and its chemical formula is XFe 2 o 4 , where X represents a divalent metal ion, such as Mn ＋2 , Zn ＋2 , Fe ＋2 etc., with magnesium aluminum spinel (MgAl 2 o 4 ) The mineral structure is the same, so it is called spinel ferrite. Spinel is a cubic structure, oxygen ion O 2－ The radius is large, and the main skeleton of the crystal is composed of oxygen ions O 2－ Close-packed, adjacent to 4 O 2－ Form a tetrahedral A site, 6 O 2－ Form an octahedral B site, aluminum ion Al ＋3 , Magnesium ion Mg ＋2 The radius ratio of O 2－ The ions are much smaller and occupy the A and B sites respectively. A spinel unit cell consists of 32 oxygen ions O 2－ There are 64 A sites and 32 B sites, of which only 8 A sites and 16 B sites are occupied by metal ions. Zinc ions Zn in m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/26
Inventor 田维广骆祥华陈敬和邱成峰
Owner 宜宾盈泰光电有限公司
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