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Fundamental study high strength Au-Pd-Cu alloys

高强度Au-Pd-Cu合金的基础研究

基本信息

批准号：
06671972
负责人：
GOTO Shin-ichi
金额：
$ 1.34万
依托单位：
The Nippon Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06671972/
关键词：
Gold alloy Palladium containing alloy Copper containing alloy Casting Mechanical property Color stability Casting defect 融点

项目摘要

The purpose of this study was to obtain fundamental data for the development of high strength dental gold alloys. Twenty Au-Pd-Cu alloys containing 10,20,30,40 and 50 mass% Pd, 10,20,30 and 40 mass% Cu and 10-80 mass% Au were made using induction melting in argon gas atmosphere, Melting point, Vickers hardness, tarnish resistance, and specific gravity were measured, and the phases of the alloys were determined using X-ray diffraction. The following summary is drawn.1) The liquidus point of experimental alloys ranged from 1035ﾟC to 1388ﾟC,and increased with the decrease of Cu content and the increase of Pd content. For the practical use, this result indicates that the liquidus point should be lowered by adding the other metal elements.2) The experimental alloys containing 20-30 mass% Cu showed the highest brightness (L^*) after the tarnish test. The defference in the brightness (DELTAL^*) before and after the test increased with the increase of the Cu content. On the other hand, the as cast, quenched and heat-hardened alloys had L^*=70, showing good tarnish resistance.3) Vickers hardness number ranged from 63.2-319 for the as cast alloys, 74.4-197 for the quenched alloys and 74.5-291 for the heat-hardened alloys. Assuming that the tensile strength is 1/3 of Hv number, experimental alloys with high Hv may have more than 95kgf/mm^2 tensile strength. From this result, the composition of high strength alloys is estimated to be 50-70Au-20-30Cu-10-30Pd.4) The result of specific gravity measurement suggests that more blow holes can be produced in the alloys containing either 50 mass% Pd or 10mass% Cu.5) The alloy phase analysis using X-ray diffraction indicates that the hardening of the alloys is based on the formation of AuCu and PdCu superlattice.

本研究的目的是为开发高强度牙科用金合金提供基础数据。采用氩气气氛感应熔炼法制备了质量% Pd为10、20、30、40和50%，质量% Cu为10、20、30和40，质量% Au为10-80的20种Au-Pd-Cu合金，测定了合金的熔点、维氏硬度、耐光泽性和比重，并用x射线衍射测定了合金的物相。总结如下。1)合金的液相点在1035 ~ 1388之间，随Cu含量的降低和Pd含量的增加而升高。这一结果表明，在实际应用中，加入其他金属元素可以降低液相点。2)含Cu质量%为20 ~ 30的合金在无光测试后亮度最高（L^*）。试验前后的亮度差（delta ^*）随着Cu含量的增加而增大。另一方面，铸态、淬火和热硬化合金的L^*=70，表现出良好的抗失光泽性。3)铸态合金的维氏硬度值为63.2 ~ 319，淬火合金为74.4 ~ 197，热硬化合金为74.5 ~ 291。假设抗拉强度为Hv数的1/3，高Hv的实验合金抗拉强度可达95kgf/mm^2以上。根据这一结果，高强度合金的成分估计为50-70Au-20-30Cu-10-30Pd。4)比重测量结果表明，在含有50%质量% Pd和10%质量% cu的合金中，可以产生更多的气孔。5)x射线衍射分析表明，合金的硬化是基于AuCu和PdCu超晶格的形成。