录音磁头在实用条件下的摩擦学性能

Tribological performance of permalloy audio heads under practical using conditions

在实际使用条件下，研究了三种坡莫合金录音磁头的摩擦学性能。研究了磁头磨损参数随使用时间的变化规律，以及磁头不同铁芯和屏蔽罩材料对磁头摩擦学性能的影响，比较了不同磁带运行速度下磁头的磨损行为，并进行了磁头的磨损失效分析。结果表明，录音磁头表面磨损为不均匀磨损，随磨损时间延长不均匀磨损更严重；三种磁头因铁芯、屏蔽罩材料不同而具有不同的摩擦学性能，其中硬坡莫合金磁头耐磨性能最好；磁头磨损是由于从磁带上脱落的Ｆｅ２Ｏ３磁粉颗粒的微切削作用造成磁头表面划痕；磁头在磨损过程中表层有冷加工硬化现象。

The friction and wear properties of three types of permalloy audio heads were investigated under practical using conditions. The variations with sliding time in wear parameters of audio heads were studied. The paper also surveyed the effect of different materials of head core and shield case on tribological performance of audio heads. The comparison of tribological property of audio heads was made under different sliding speeds of magnetic tapes. The wear failure analysis of audio heads was carried out. It was found that the wear does not occur uniformly over the tape travelling surfaces of audio heads. The irregular wear becomes very remarkable after long rubbing in the heads. The three types of permalloy heads have different wear performances because the head core, shield plate and shield case are made of permalloy or hard permalloy, among which the hard permalloy core and case have the best wear properties. The wear of audio heads is due to the abrasive action of Fe 2O 3 magnetic particles dropped from the tapes which causes surface scratches on the surface of audio heads. The work hardening is present on the surface of audio heads during the wear process.