EP0848070B1 - Warmfester Platinwerkstoff - Google Patents
Warmfester Platinwerkstoff Download PDFInfo
- Publication number
- EP0848070B1 EP0848070B1 EP97116610A EP97116610A EP0848070B1 EP 0848070 B1 EP0848070 B1 EP 0848070B1 EP 97116610 A EP97116610 A EP 97116610A EP 97116610 A EP97116610 A EP 97116610A EP 0848070 B1 EP0848070 B1 EP 0848070B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- platinum
- hafnium
- und
- alloy
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/04—Alloys based on a platinum group metal
Definitions
- the invention relates to a heat-resistant platinum material, which contains at least 99.5% by weight of platinum and rare earths.
- Heat-resistant platinum materials are used for many purposes Can be used in industry and in the laboratory, where special Mechanical, thermal and chemical requirements Persistence.
- a special area of application is the glass melting technology, where platinum crucibles and -Construction parts increasingly for manufacturing high purity and homogeneous optical glasses for Flat screens, television tubes, PC monitors and Proven glass fibers.
- Manufacturing routes have also been followed which are based on the conventional melting metallurgy based and with try alloying measures, a Grain size stabilization and structural hardening too to reach. Basically you use a combination the mechanisms of precipitation hardening (Dispersion hardening through species-specific, but thermally unstable particles), mixed crystal hardening and Grain boundary segregations.
- US-A-5 518 691 describes a platinum material with the following composition: 0.01-1% Ti, Zr, Hf or rare earth metals, balance Pt.
- GB-A-1 238 013 describes a platinum alloy with up to 20 atom% La, Sc, V, Y, Zr, Hf and Ta, rest Pt.
- the Material 0.1 to 0.4 wt.% Hafnium and a total of 0.1 to 0.4% by weight yttrium and / or lanthanum and / or gadolinium,
- the rest contains at least 99.5% by weight of platinum.
- the material preferably contains at least 99.5 % By weight of platinum 0.2 to 0.4% by weight of hafnium and a total of 0.15 up to 0.3% by weight of yttrium and / or lanthanum and / or gadolinium.
- the mode of action of the hafnium additive is based on a Solid-solution strengthening of platinum and an increase in Solubility limit for the elements yttrium, gadolinium and Lanthanum. Concentrations below 0.1% by weight show in this Regarding no noticeable impact, additions of more than 0.4% by weight hafnium (in conjunction with the other ternaries Additives) deteriorate the desired properties.
- Precipitation hardening is based on the formation of stable intermetallic phases such as YPt 3 , YPt 5 , GdPt 5 , GdPt 2 , LaPt 5 , LaPt 2 , HfPt 3 and HfPt 5 . It has been shown that at concentrations> 0.4% by weight of hafnium the solubility in the solid state is clearly exceeded and these phases already appear as relatively coarse particles (> 10 ⁇ m) during solidification. These have a significantly negative impact on creep rupture strength. Additional amounts of ⁇ 0.1% by weight result in a significantly lower volume fraction of the precipitation phase and thus also an undesirable drop in strength.
- hafnium is added better values in terms of creep rupture strength 1200 ° C than with the same amounts of the known Additional element zirconium with otherwise identical contents Rare Earth. It has been found that the intermetallic phases of hafnium with platinum and Rare earths are more stable than that of zirconium and that Hafnium gives platinum a higher basic strength.
- Examples 2 and 13 are particularly interesting. They differ only in that the alloy according to 2) contains 0.25% by weight hafnium and the alloy according to 13) contains 0.25% by weight zirconium instead of hafnium.
- the zirconium-containing platinum alloy has a considerably lower creep rupture strength than the hafnium-containing ones.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Insulated Conductors (AREA)
- Powder Metallurgy (AREA)
- Catalysts (AREA)
- Thermistors And Varistors (AREA)
- Inorganic Insulating Materials (AREA)
Description
Mit jeweils variierten Hf- und Y-Gehalten wurden in analoger Weise wie in den Beispielen 1 und 2 drei weitere Legierungen im System Pt-Hf-Y hergestellt und getestet. Die Ergebnisse sind ebenfalls in der Tabelle vermerkt. Die Legierung nach Beispiel 5 liegt im Hf-Gehalt außerhalb des erfindungsgemäßen Bereichs und zeigt daher geringere Warmfestigkeit.
Claims (2)
- Warmfester Platinwerkstoff in Form einer ternären Legierung aus Platin und Übergangselementen,
dadurch gekennzeichnet,
daß die Legierung aus 0,1 bis 0,4 Gew.% Hafnium, 0,1 bis 0,4 Gew.% eines der Elemente Yttrium, Lanthan oder Gadolinium und im Rest aus mindestens 99,5 Gew.% Platin besteht. - Warmfester Platinwerkstoff nach Anspruch 1,
dadurch gekennzeichnet,
daß die Legierung 0,2 bis 0,4 Gew.% Hafnium und 0,15 bis 0,30 Gew.% der Elemente Yttrium, Lanthan oder Gadolinium enthält.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19651850 | 1996-12-13 | ||
DE19651850A DE19651850A1 (de) | 1996-12-13 | 1996-12-13 | Warmfester Platinwerkstoff |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0848070A1 EP0848070A1 (de) | 1998-06-17 |
EP0848070B1 true EP0848070B1 (de) | 2001-08-29 |
Family
ID=7814575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97116610A Expired - Lifetime EP0848070B1 (de) | 1996-12-13 | 1997-09-24 | Warmfester Platinwerkstoff |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0848070B1 (de) |
JP (1) | JP3803479B2 (de) |
AT (1) | ATE204920T1 (de) |
DE (2) | DE19651850A1 (de) |
ES (1) | ES2164287T3 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001049364A (ja) * | 2000-07-03 | 2001-02-20 | Kazuo Ogasa | 硬質貴金属合金部材とその製造方法 |
DE10046456C2 (de) | 2000-09-18 | 2003-04-10 | Heraeus Gmbh W C | Durch feinverteilte, kleine Teilchen aus Unedelmetalloxid dispersionsverfestigter, goldfreier Platin-Werkstoff |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1238013A (de) * | 1967-06-28 | 1971-07-07 | ||
DE1758549A1 (de) * | 1967-06-28 | 1971-02-11 | Johnson Matthey Co Ltd | Metall-Legierungen,die Metalle der Platingruppe enthalten,sowie Verfahren zum Herstellen dieser Legierungen |
US5518691A (en) * | 1993-07-29 | 1996-05-21 | Tanaka Kikinzoku Kogyo K.K. | Precious metal material |
-
1996
- 1996-12-13 DE DE19651850A patent/DE19651850A1/de not_active Ceased
-
1997
- 1997-09-24 DE DE59704436T patent/DE59704436D1/de not_active Expired - Fee Related
- 1997-09-24 ES ES97116610T patent/ES2164287T3/es not_active Expired - Lifetime
- 1997-09-24 EP EP97116610A patent/EP0848070B1/de not_active Expired - Lifetime
- 1997-09-24 AT AT97116610T patent/ATE204920T1/de not_active IP Right Cessation
- 1997-12-10 JP JP34004197A patent/JP3803479B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE19651850A1 (de) | 1998-06-18 |
JP3803479B2 (ja) | 2006-08-02 |
ES2164287T3 (es) | 2002-02-16 |
ATE204920T1 (de) | 2001-09-15 |
JPH10195561A (ja) | 1998-07-28 |
EP0848070A1 (de) | 1998-06-17 |
DE59704436D1 (de) | 2001-10-04 |
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