変成ガスふんい気中でのMn-Znフェライトの焼成
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概要
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Since Mn-Zn ferrite is to be oxydized in air atmosphere at a temperature range between 500℃ and 1 100℃, αFe_2O_3 and Mn_2O_3 are easily precipitated in the manufacturing process and magnetic properties of Mn-Zn ferrite are usually detoriorated. In order to remedy such a fault in the manufacturing process of Mn-Zn ferrite, rapid cooling method in air or slow cooling method in N_2 is used. In former case, however, many cracks may occur in ferrite body and even in latter case the technical problems about oxygen partial pressure are remained. In this report, the authors tried to hire Mn-Zn ferrite in N_2+CO_2 gas atmosphere converted from air and town gas or commercial propane gas. The magnetic properties of Mn-Zn ferrites fired in converted gas atmosphere are shown in the relations among B_m (maximum flux density in core subject to alternating magnetizing force), H_m (maximum magnetizing force in core subject to alternating magnetizing force), μ_<AC> (amplitude permeability) and W (hysteresis loss). The results show that the magnetic properties of Mn-Zn ferrite fired in the converted gas atmosphere are equal to the magnetic properties of Mn-Zn ferrite fired in N_2+0.5%O_2 atmosphere which is most suitable for the firing of Mn-Zn ferrite. So that, even if Co_2 gas in converted gas had the effect of oxidizing ferrite body, the effect might be only exerted on the oxidation of metal ions in spinel ferrite because the effect is not so strong. This has a good advantage in making Mn-Zn ferrite in commercial production which is connected with financial and O_2 partial pressure problems.
- 社団法人日本材料学会の論文
- 1962-10-15
著者
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