[Sandwich type dental magnetic devices of Nd-Fe-B magnet and permendur].
[Sandwich type dental magnetic devices of Nd-Fe-B magnet and permendur].
复制标题
钕铁硼磁铁与permendur夹层型牙科磁力装置[J].
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
Y. Kinouchi
中科院分区：
文献类型：
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作者：
O. Okuno;T. Nakano;H. Hamanaka;Y. Kinouchi
Nd-Fe-B磁体具有非常高的最大能量积（BH max），其被定义为磁体和相对的磁性材料之间的吸引强度。Permendur（Fe-49 Co-2 V）具有最大的磁饱和度（Bs），这使其具有强磁化性。如果磁性固位体由Nd-Fe-B磁体和坡尔曼杜尔磁轭制成，则它们将是小的并且具有强固位力。本研究的目的是开发小型牙科磁性装置与Nd-Fe-B磁铁和坡明德轭。磁性装置与磁性不锈钢衔铁构成双磁式磁路。使用4 × 3 × 2 mm矩形棱柱Nd-Fe-B磁体。磁铁夹在半圆柱形的磁轭之间。为了保护磁体免受腐蚀，通过不锈钢管和箔的银钎焊和粘合，用304不锈钢封装器械。通过实验确定了磁轭的最佳横截面积。对于4 x 3 x 2磁体，装置的尺寸为phi 5 x 3.5 mm。磁性不锈钢（XM 27型）保持器的平均断裂保持力为852g。这种分离固位对于牙科修复应用是足够的。
Nd-Fe-B magnets have a very high maximum energy product (BH max), which is defined as the attractive strength between a magnet and opposing magnetic materials. Permendur (Fe-49 Co-2 V) has the greatest magnetic saturation (Bs), which makes it strongly magnetized. If magnetic retainers were made with Nd-Fe-B magnets and a permendur yoke, they would be small and have strong retention. The purpose of this investigation was to develop small dental magnetic devices with Nd-Fe-B magnets and permendur yokes. The magnetic devices form sandwich-type magnetic circuits with magnetic stainless steel keepers. A 4 x 3 x 2 mm rectangular prism Nd-Fe-B magnet was used. The magnet was sandwitched between the semi-columnar yokes. To protect the magnet from corrosion, the devices were encapsulated with 304 stainless steel by silver brazing and adhesion bonding of a stainless steel tube and foil. The optimum cross-sectional area of the yoke was determined experimentally. The dimensions of the devices were phi 5 x 3.5 mm for 4 x 3 x 2 magnet. The breakaway retention for a keeper of magnetic stainless steel (Type XM 27) was 852 g on average. This breakaway retention is sufficient for dental prosthetic applications.