弱磁技术在非铁磁性材料检测中的应用研究

Research on the Application of Weak Magnetic Technology in the Detection of Non-ferromagnetic Materials

提出一种能够应用于铁磁性与非铁磁性材料缺陷检测的弱磁检测技术,并以多晶硅和7A09铝合金两种非铁磁性材料为例,阐述了该技术检测非铁磁性材料的一般过程,即测试材料磁导率、设计实验、采集信号及信号分析。多晶硅自然缺陷检测实验表明,弱磁检测技术能够检测直径为10μm的夹杂缺陷;铝合金人工缺陷检测实验表明,对于0.4 mm的孔型缺陷和深度为1~2 mm的槽型缺陷,弱磁检测技术都具有很好的检测效果;验证了这种检测方法在非铁磁性材料检测中的可行性。

Magnetic detection technology had generally used in the defect detection of ferromagnetic materials. In current study,a kind of weak magnetic detection technology which can be applied to the defect detection of ferromagnetic and non-ferromagnetic materials is presented. The basic principle of the technology of weak magnetic detection is introduced. Taking two kinds of nonferromagnetic materials,polysilicon and 7A09 aluminum alloy as an example,in this paper,the general process of detecting non ferromagnetic materials by using weak magnetic detection technology has been described. Having tested material permeability,designed experiment,collected and analyzed signals. The experiments on natural defect detection of polysilicon shows that the weak magnetic detection technology can detect the inclusion defects of 10 μm diameter,and the experiments of artificial defect detection of aluminum alloy shows that the weak magnetic detection technology has a good detection effect on 0. 4mm hole defect and groove type defect in 1 mm to 2 mm depth. The feasibility of this method in the detection of non ferromagnetic materials has been verified.