Development of Fe-Pt Permanent Magnet Alloys for Dental Parts

牙科零件用铁铂永磁合金的研制

• 批准号: 07555505
• 负责人: WATANABE Masato
• 金额: $ 1.41万
• 依托单位: Research Institute For Electric and Magnetic Materials
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555505/
• 关键词: permanent magnet; Fe-Pt alloy system; order phase alloy; maximum energy products; dental prosthesis; precise dental casting method; attractive force; sputtering method; 鉄-白金系合金; クラウン・ブリッジ; 歯科精密鋳造

Up to the present, it has been known that magnetic attachments, which have already been used tractically, have several problems that must be solved from clinical point of view. In order to solve the preceding problems, we have contrived a new type of magnetic denture in which prosthetics consist of high corrosion resistant Fe-Pt permanent magnet alloy. It utilizes attractive force between a magnet and a keeper made of stainless steel to fix crowns and/or bridges.Because our magnetic denture cannot be realized without the castable Fe-Pt permanent magnet, first of all, we examined the optimum conditions of casting and the optimum concentrations, where low surface roughness and high magnetic properties are obtained, by using a precise casting apparatus for dental use. After the investigation, we determined the optimum Fe-Pt permanent magnet to be an Fe-39.5at%Pt-0.65at%Nb-0.1at%Si alloy and attempted to prepare specimens with the form of disk and crown. The disk specimens and the crown ones were found to have the mean values of attractive force of 600 gf and 540 gf, respectively, which are strong enough for clinical applications.Recently, small and strong permanent magnets become to be required for dental and other applications. We have found a very high energy product over 35 MGOe for the Fe-Pt (001) alloy thin films with perpendicular magnetization, which were prepared by sputtering.The preceding research results were presented in international and domestic conferences of the dental and material fields.

到目前为止，人们已经认识到，磁性附着体在临床上已经得到了广泛的应用，但仍存在一些问题，需要从临床角度加以解决。为了解决上述问题，我们设计了一种新型的磁性义齿，其修复体由高耐腐蚀的Fe-Pt永磁合金组成。它利用磁铁和不锈钢支架之间的吸引力来固定牙冠和/或桥。由于我们的磁性义齿离不开可浇注的Fe-Pt永磁体，因此首先，我们通过精密铸造设备研究了最佳铸造条件和最佳浓度，从而获得低表面粗糙度和高磁性能。经过研究，我们确定了Fe-Pt永磁体的最佳材料为Fe-39.5at%Pt-0.65at%Nb-0.1at%Si合金，并尝试制备了盘状和冠状的永磁体试样。盘状标本和冠状标本的平均吸引力分别为600 gf和540 gf，足以用于临床应用。最近，牙科和其他应用需要小而强的永磁体。我们发现用溅射法制备的Fe-Pt（001）合金垂直磁化薄膜的能量积超过35 MGOe。上述研究成果已在国内外牙科及材料领域的会议上发表。

项目成果

Masato Watanabe: "Perpendicular Magnetization of Epitaxial FePt(001)Thin Films with High Squareness and High Coercive Force" Jpn.J.Appl.Phys.Vol.35,Pt.2. L1264-L1267 (1996)

Masato Watanabe：“具有高方形度和高矫顽力的外延 FePt(001) 薄膜的垂直磁化”Jpn.J.Appl.Phys.Vol.35，Pt.2。

Taro Kanno: "An Application of Fe-Pt-Nb Magnet to Crown and Bridge Prosthodontics" J.J.Mag. Dent.Vol.5, No.1. 58-66 (1996)

Taro Kanno：“Fe-Pt-Nb 磁铁在牙冠和牙桥修复中的应用”J.J.Mag。

渡辺雅人: "FePt(001)エピタキシャル垂直磁化膜の作製と磁気特性" 日本応用磁気学会誌. 21巻特集号. (1997)

渡边正人：“FePt(001)外延垂直磁化膜的制备和磁性能”日本应用磁学学会杂志第 21 卷特刊（1997 年）。

Takafumi Nakayama: "Magnetic Properties of Fe-Pt Magnets Prepared by Dental Casting" J.Magn. Soc. Jpn.Vol.21, No.4-2. 377-380 (1997)

Takafumi Nakayama：“牙科铸造制备的 Fe-Pt 磁体的磁性”J.Magn。

Masato Watanabe: "Perpendicular Magnetization of Epitaxial FePt (001) Thin Films with High Squareness and High Coercive Force" Jpn.J.Appl. Phys.Vol.35, Pt.2. L1264-1267 (1996)

Masato Watanabe：“具有高方形度和高矫顽力的外延 FePt (001) 薄膜的垂直磁化”Jpn.J.Appl。