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english - Engineered Components for High Quality Glasses

english - Engineered Components for High Quality Glasses

elongation [%] 100 90 80

elongation [%] 100 90 80 70 60 50 40 30 20 10 0 Pt-10%Rh Pt-10%Rh ODS -8- Pt-20%Rh Pt-10%Rh DPH 0 5 10 15 20 time [h] Fig. 7: Creep curves of bushing materials investigated in initial state at 1600°C and 6.0 MPa (except Pt-10%Rh ODS with 5.0 MPa) elongation [%] 60 50 40 30 20 10 Pt-10%Rh DPH after long-term test (6.85 MPa) Pt-10%Rh DPH initial state (7.0 MPa) Pt-10%Rh DPH after laboratory test (6.85 MPa) 0 0 5 10 15 20 25 time [h] Fig. 8: Creep curves of Pt-10%Rh DPH after long-term test and after laboratory test (both 6.85 MPa) in comparison with initial state (7.0 MPa) at 1600°C Scheckenbach, Merker, Fischer, Schurig, Lupton, Kravchenko: PtRh alloys for glass fibre bushings PFAM XIII, 6 – 8 December 2004, Singapore

-9- Structure The influence of HT-glass on the structure of the bushing materials investigated was also studied. There are significant differences between solid solution strengthened and oxide dispersions strengthened alloys. Fig. 9 shows the structure of Pt-10%Rh and Pt-10%Rh DPH. The initial state of both alloys has a deformed structure with a very small grain size. The long-term test in melting down HT-glass mixture led to grain growth of solid solution strengthened Pt-10%Rh. Pt-10%Rh DPH, however, still showed a fine grained structure after glass contact due to the oxide dispersion with Y- and/or Zr-oxides. a) b) c) d) 500 µm Fig. 9: a) Pt-10%Rh initial state b) Pt-10%Rh DPH initial state c) Pt-10%Rh after long-term test in melting down HT-glass mixture d) Pt-10%Rh DPH after long-term test in melting down HT-glass mixture Scheckenbach, Merker, Fischer, Schurig, Lupton, Kravchenko: PtRh alloys for glass fibre bushings PFAM XIII, 6 – 8 December 2004, Singapore

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