气雾化快凝磁性磨料陶瓷颗粒增强相分布的研究

Study on the Distribution of Ceramic Particles in the Magnetic Abrasive Manufactured by Gas Atomization and Rapid Solidification Method

以铁合金作为基体,刚玉粉为磨粒,在雾化快凝装置中采用气雾化快凝法制备不同粒度的磁性磨料;在经过镶嵌、研磨、抛光、酸洗之后,采用热场发射扫描电子显微镜(SEM)观察磁性磨料的剖面形貌,结果表明刚玉粉在磁性磨料中的分布具有一定规律,绝大部分刚玉粉均匀牢固致密地嵌于铁磁性基体表层,且嵌入基体的深度大于自身半径,而基体内部基本无刚玉粉颗粒分布,对这一现象产生的原因利用陶瓷颗粒穿透模型和机械作用机制进行系统的计算与分析。

Ferroalloy was used as the magnetic phase, corundum powder as the abrasive, and different size of magnetic abrasives were prepared by the method combined gas atomization and rapid solidification in spary deposition chamber. Magnetic abrasives were molded with phenolic resin and then ground, polished, corroded and metal sprayed. Scanning electron microscope （SEM） were used to characterize the morphology of magnetic abrasive. The results indicated that the distribution of ceramic particles in magnetic abrasive showed a certain regular. Rigid abrasives adhere to the out surface of ferromagnetic matrix and firmly embedded in the base suoCace. The depth of abrasive embed into matrix is greater than its radius. But there is few of ceramic particles distribute in the matrix. It is to find out the reaso~ why the particles adhere to the out surface of the matrix based on ceramic particles penetrate models and mechanical mechanisms.