Electromagnetic Properties of Flame-sprayed Fe-Si-Al Ternary Alloy Sheets and Their Application to the Audiohead Core

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Abstract
This experiment was carried out to produce Fe-Si-Al ternary alloys by means of powdertype spraying method, and some properties of the sheets produced under the various spraying conditions of spraying were examined. Audio-heads were made from both sprayed Fe-Si-Al ternary alloy sheets and laminated sheets of Fe-Si-Al ternary alloy and copper. Of course, such materials were produced under the optimum spraying condition based on the previous experimental result, and the audio-head characteristics were measured.The results obtained.are as follows: (1) Oxygen-hydrogen flame for Fe-Si-Al ternary alloy powder spraying is more suitable than oxygen-acetylene gas. (2) Flame sealing by nitorogen on argon gas is not so effective in improving the magnetic properties. (3) Magnetic properties depend on the spraying distance. In this process, the distance of 8-12cm gave the best results. (4) Chemical analysis of the sprayed Fe-Si-Al alloy sheet showed that 0.2-0.3wt% o of silicon and aluminium were lost irrespective of the spraying distance. (5) Line patterns by X ray micro analyser of the product showed that aluminium is too much enriched locally as compared with the original powder content.Sudh aluminium may be in metallic or oxidized state. (6) Record-play back frequency characteristics of heads made from the sprayed Fe-Si-Al ternary alloy sheet are superior to those from laminated permalloy plates.

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