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

1.采用底涂层法研究了铁铂合金与义齿树脂的粘附性。使用包含VBATDT的底漆的剪切粘结强度几乎与未用任何底漆处理的对照样品的强度相同。经10000次热循环（10000 TC）后，剪切粘结强度降至1 MPa。使用包含4-Meta的底漆的粘结强度是对照样品的两倍强。在10000 TC之后，使用包含4-Meta的底漆的粘结强度降低至与10000 TC对照样品相同。在MDP或MEPS包括底漆的情况下，粘结强度超过15 MPa，是对照样品的3倍。此外，在TC 10000之后，使用包含MDP的底漆的粘结强度在热循环之前几乎相同，尽管MEPS处理受到热循环的影响。研究了MDP单体对铁铂磁体耐磨性的影响。铁铂磁体的磨损量与钴铬合金相当，仅为金合金和银钯铜金合金的二十分之一。这表明，通过时效过程生成有序的L1_0相，可以获得优异的耐磨性，而L1_0相是硬磁性能所必需的。3.观察了射频溅射制备的微机械用铁铂薄膜的微观结构。在50℃时效时剩磁增强。TEM观察表明，在50 nm范围内，合金的微观结构为fcc无序相和L1_0有序相的混合相。这些相之间的交换作用似乎导致剩磁的增强。

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.