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Studies on improvement of superelasticity in dental gold alloys

提高牙科金合金超弹性的研究

基本信息

批准号：
14370647
负责人：
YOSHIDA Takaichi
金额：
$ 4.54万
依托单位：
THE NIPPON DENTAL UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14370647/
关键词：
dental gold alloys grain refinement fatigue test wear test tensile test color difference hardness 硬さ金合金ランタノイド系結晶微細化疲労物理・化学的性質

项目摘要

Experiments were performed to improve the characteristics of super-elastic gold alloy for denture clasps, in which stability of the characteristics was investigated increasing the fineness of crystal grains.At first, using 65wt% Au-12Cu-23Zn as base alloy, Ru and Hf and additional 0-1% lanthanoid metals, La, Ce, Nd, Sm, Gd, were added to perform fatigue test, and investigate the fineness of crystal grains. Good characteristics were obtained by the further addition of Sm, Gd, and Ld when only Ru was added to the base alloy, and by additionally adding Sm, Gd, and La when Hf and Ru were added to the base alloy.Next, using 7 types of base alloys [No.30 (64wt% Au-12Cu-24Zn), No.31 (65wt% Au-11Cu-24Zn), No.36 (64wt%Au-13Cu-23Zn), No.37 (65wt%Au-12Cu-23Zn), No.38 (66wt% Au-11Cu-23Zn), No.40 (65wt% Au-13Cu-22Zn), No.41 (6Gwt% Au-12Cu-22Zn)], 0.5wt% Ru and additional 0.5% La, Sm, and Gd, or 0.5wt% Ru + 0.25 Hf and additional 0.25% La, Sm, and Gd were added to the base alloys to perform hardness test, tensile strength test, abrasion test, and fatigue test, and to investigate the fineness of the crystal grains. The following results were obtained:1.Increases in the fineness of the crystal grains were greatest when 0.5wt% Ru + 0.5 Sm were added to No.40 base alloy, and second greatest when 0.5wt% Ru + 0.25 Hf + 0.25 Sm, or 0.5wt% Ru + 0.5 Gd, or 0.5wt% Ru + 0.25 Hf + 0.25 Gd were added to No.30 base alloy.2.By fatigue test, approximately 12,000 times were obtained when 0.5wt% Ru + 0.25 Hf + 0.25 La were added to No.37 base alloy, and when 0.5wt% Ru + 0.5 Sm were added to No.40 base alloy. More than 20,000 times were obtained when 0.5wt% Ru + 0.25 Hf + 0.25 Sm were added to No.41.Therefore, it was found that good characteristics were obtained under these conditions of the types and amounts of additions.

为了提高义齿卡环用超弹性金合金的性能，研究了晶粒细化对合金性能的影响，首先以65wt%的Au-12 Cu-23 Zn合金为基体，添加Ru、Hf和0-1%的镧系元素La、Ce、Nd、Sm、Gd进行疲劳试验，研究晶粒细化对合金性能的影响。当仅向基础合金中添加Ru时，通过进一步添加Sm、Gd和Ld，以及当向基础合金中添加Hf和Ru时，通过另外添加Sm、Gd和La，获得了良好的特性。（64wt% Au-12 Cu-24 Zn），No.31（65wt% Au-11 Cu-24 Zn），36号（64wt%Au-13Cu-23Zn），37号（65wt%Au-12Cu-23Zn），38号（66wt% Au-11 Cu-23 Zn），No.40（65wt% Au-13 Cu-22 Zn），No.41（6Gwt% Au-12 Cu-22 Zn）]、0.5wt% Ru和附加的0.5%La、Sm和Gd，或0.5wt% Ru +0.25Hf和附加的0.25%La、Sm和Gd加入到基础合金中以进行硬度测试，拉伸强度测试、磨损测试和疲劳测试，并考察晶粒的细度。结果表明：（1）在40号合金中加入0.5wt%Ru +0.5Sm时晶粒细化程度最大，在30号合金中加入0.5wt%Ru +0.25Hf +0.25Sm、0.5wt%Ru +0.5Gd、0.5wt%Ru +0.25Hf +0.25Gd时晶粒细化程度次之;（2）在37号合金中加入0.5wt%Ru +0.25Hf +0.25La时晶粒细化程度最大，在40号合金中加入0.5wt%Ru +0.5Sm时晶粒细化程度最小。在41号中加入0.5wt%Ru +0.25Hf +0.25Sm时，可获得20,000倍以上的性能。因此，发现在此添加剂种类和用量条件下，可获得良好的性能。