New Platinum Materials for High Temperature Applications

Abstract

When platinum materials are used for structural components in the high‐temperature range, for example in the glass industry and in space technology, extremely high thermal, mechanical and chemical loadings arise. Apart from the solid solution hardened alloys, dispersion strengthened platinum materials have also been well‐known for a long time. However, these dispersion strengthened platinum materials show considerable problems during the manufacturing process. Especially after welding of components, crack formation is caused by the very poor ductility during the high‐temperature use. This paper reports on a new class of dispersion hardened platinum materials (Pt DPH materials). These materials, manufactured by Heraeus, have been the subject of a detailed programme of laboratory investigations and industrial tests. By means of the development of these materials, it is now possible to avoid the disadvantages mentioned above. After a short introduction describing the manufacture and structure of the new DPH materials the report gives comprehensive results on the examination of their improved high‐temperature mechanical properties. The results of stress‐rupture tests and tensile tests verify that the novel DPH materials display high temperature strength, low creep rate and simultaneously very good ductility. The Pt DPH materials also show excellent properties even after welding, under cyclically changing temperatures, with notches and after corrosion exposure in aggressive glass melts. Finally, test results from the use of these novel Pt DPH materials in analytical laboratories and in the glass industry are given.

Ultrahigh-Temperature Materials for Jet Engines

“…The oxidation behavior and the densitynormalized strength of these materials are compared in Figures 2 and 3. [24][25][26][27][28][29][30][31][32][33][34][35][36][37] The reader is cautioned that the data for the different materials were not necessarily obtained under comparable conditions and that all materials shown are under continuous development with progressively improving properties.…”

On the mechanism of internal oxidation in platinum–zirconium alloys

“…He described a preferred oxidation along the grain boundaries of the material. Later Fischer [17] describes a similar effect.…”

Platinum-Based Alloys and Coatings: Materials for the Future?

“…Mechanically, Pt alloys combine high ductility with adequate creep strength. These properties give the alloys potential for applications in the chemical industry, space technology and glass industry (Fischer, 2001;Whalen, 1988;Lupton, 1990). In the spacecraft industry, Pt-materials are used to increase the heat resistance of rocket engine nozzles.…”

“…Their low ductility also renders Pt ODS alloys unable to withstand stress concentrations caused by thermal expansion during frequent and rapid temperature changes. Difficulties in fabrication, especially decreased strength due to coagulation of oxide particles after welding, have discouraged the use of ODS platinum alloys (Fischer, 2001). Heraeus (2011) produces ODS Pt-alloys (dispersion hardened platinum DPH® alloys), in a process with internal oxidation, removing the disadvantages of conventional ODS Pt-alloys.…”

“…By assessing the applications of a range of Pt alloys, PGMs have been selected as potential base materials in the quest to provide a higher temperature alternative to the Ni-based superalloys. Fischer et al (1997;1999a;1999b; and Völkl et al (2000) stated that problems encountered in the aerospace industry could be solved by using Pt-based alloys because they perform exceptionally well in various high-temperature applications, including areas such as glass manufacturing and the handling of corrosive substances (Fischer et al, 2001;Coupland et al, 1980;Hill et al, 2001a). The idea of using an fcc PGM analogue has arisen several times (Bard et al, 1994): in NIMS, Japan with good properties for iridium-based and rhodium-based alloys (Yamabe et al, 1996;1997;1998a;1998b andYu et al, 2000), Pt-Ir alloys (Yamabe-Miterai et al, 2003) Pt-Al-Nb and Pt-Al-Ir-Nb alloys (Huang et al, 2004), and platinum-based alloys in South Africa (Wolff & Hill, 2000).…”