低熔点玻璃粉包覆FeSiAl合金的结构和电磁性能

FeSiAl alloy flakes were coated with glass powder D250 of low melting point via a two-step process, i.e. FeSiAl alloy flakes and glass powders D250 were firstly blended by ball milling to prepare D250 powders covered FeSiAl alloy flakes and then which was heat treated at proper elevated temperature. The phase composition, surface topography and composition of the coated flakes were characterized by using XRD, SEM, XRF and EDS. The electromagnetic parameter and reflection loss were also assessed in the frequency range of 1~18 GHz by using vector network analyzer. The results show that a dense coating formed on the flakes with uniform appearance, which present a lower real part of their complex permittivity of about 8. The glass D250 coated FeSiAl alloy flakes with optimal performance could be acquired when the heat treatment process was conducted at 700℃, namely the maximum reflection loss depresses to -40.10 dB, and the effective bandwidth reaches to 3.76 GHz, respectively.

Keywords： metallic materials ; FeSiAl alloy ; melt coating ; absorptivity