New evolution of magnetic attachment system applying iron-platinum magnetic alloys

1.用底漆研究了铁铂合金与义齿树脂的粘接性能。含VBATDT底漆的粘接强度与未经任何底漆处理的对照试件的剪切粘结强度基本相同。经过10000次热循环(10000TC)后，剪切结合强度降至1 Mpa。使用含4-金属的底物的粘接强度是对照样品的两倍。10000TC后，使用4-金属包被底物的粘接强度下降到与10000TC对照样品相同的水平。在含有MDP或MEP的情况下，结合强度超过15 Mpa，是对照样品的3倍。此外，在TC10000之后，尽管MEPS处理受到热循环的影响，但使用含有MDP的底漆的粘接强度在热循环前几乎相同。将铁铂合金粘接到树脂上最合适的底漆是MDP单体。2.研究了铁铂磁体的耐磨性。铁-铂磁体的磨损与钴-铬合金相同，是金烷基合金和银-钯-铜-金合金的二十分之一。这似乎是通过时效过程获得了良好的耐磨性，从而生成了具有硬磁性能所必需的有序的L10相。3.观察了射频溅射制备的铁铂薄膜的微观结构。在50℃老化时，剩磁增强。透射电子显微镜观察发现，在50 nm范围内，显微组织由面心立方无序相和L1_0有序相组成。这些相之间的交换作用似乎是导致剩磁增强的原因。

1.We investigated adhesion between the iron-platinum alloy and denture resin using primer. The shear bond strength using VBATDT included primer was almost the same strength of the control sample that was not treated by any primer. After 10000 times thermal cycle (10000TC), the shear bond strength decreased to 1 MPa. The bond strength using 4-META included primer was twice strong as the control sample. After 10000TC, the bond strength using 4-META included primer decreased to the same as the 10000TC control sample. In the cases of MDP or MEPS included primers, the bond strengths were over 15 MPa and three times as strong as that of the control sample. In addition, after TC10000, the bond strength using MDP included primer was almost the same before thermal cycle, although the MEPS treatment suffered from the thermal cycle. The most appropriate primer for bonding iron-platinum alloy to resin is considered to include MDP monomer.2.We investigated wear resistance of the iron-platinum magnet. Wear of the iron-platinum magnet was the same of the Co-Cr alloy and a twentieth as much as those of the gold alky and the silver-palladium-copper-gold alloy. It seems that the excellent wear resistance is obtained by the aging process to generate the ordered L1_0 phase that is necessary for the hard magnetic properties.3.We observed microstructure of the iron-platinum thin film fabricated by RF sputtering for the application of micro-machine. Remanence enhancement occurred by aging at 50℃. TEM observation unveiled that the microstructure was intermingled with the fcc disordered phase and the L1_0 ordered phase within a 50nm area. Exchange interaction between these phases seemed to lead the remanece enhancement.