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

1.我们用底漆研究铁铂合金与义齿树脂的粘附性。使用含VBATDT引物处理后的剪切结合强度与未处理引物的对照样品的剪切结合强度基本相同。经过10000次热循环（10000TC）后，剪切粘结强度降至1mpa。含4-META引物的结合强度是对照样品的2倍。10000TC后，含4-META引物的粘结强度下降到与10000TC对照样品相同。在包含MDP或MEPS引物的情况下，结合强度超过15 MPa，是对照样品的3倍。此外，在TC10000之后，虽然MEPS处理受到热循环的影响，但使用MDP含底漆的粘结强度与热循环前基本相同。认为MDP单体是铁铂合金与树脂结合最合适的底漆。我们研究了铁铂磁铁的耐磨性。铁铂磁铁的磨损程度与钴铬合金相同，是金合金和银钯铜金合金磨损程度的二十分之一。结果表明，通过时效过程产生的有序的L1_0相是获得优异的耐磨性所必需的。研究了射频溅射制备的用于微机械的铁铂薄膜的微观结构。经50℃时效处理后，剩余物增强。TEM观察发现，在50nm范围内，微观结构为fcc无序相和L1_0有序相混杂。这些相之间的交换作用似乎导致了剩磁增强。

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.