US3753701A - Refractory metal alloys for use in oxidation environments - Google Patents

Refractory metal alloys for use in oxidation environments Download PDF

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US3753701A
US3753701A US00214352A US3753701DA US3753701A US 3753701 A US3753701 A US 3753701A US 00214352 A US00214352 A US 00214352A US 3753701D A US3753701D A US 3753701DA US 3753701 A US3753701 A US 3753701A
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percent
oxidation
alloy
refractory metal
columbium
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US00214352A
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W Anderson
R Mendelson
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Northrop Grumman Space and Mission Systems Corp
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TRW Inc
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium

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  • ABSTRACT A refractory metal alloy comprising principally columbium and titanium, with lesser amounts of beryllium, chromium, silicon and yttrium provides excellent resistance to air oxidation at high temperature.
  • the broad composition range is as follows: Columbium 32.5-46 percent; Titanium 50.5-57.5 percent; Beryllium 0-8 percent; Chromium 2.l5-2.6 percent; Silicon 0-8 percent; and Yttrium 0-O.l percent; all parts by weight.
  • Refractory alloys have been employed as castings, forgings, etc., at high temperatures. Typical examples of refractory alloys are found in US. Pat. Nos. 3,086,859; 2,940,845; 2,99l,l97; 2,880,088; 2,819,960; 2,754,204; and 3,368,881.
  • an object of the present invention to provide a refractory alloy which may be employed as castings, forgings, etc., in a high temperature, oxidizing environment such as air.
  • the broad range of the components in the refractory alloy is as follows:
  • FIGS. 1-4 are graphs showing the relationship between exposure time and weight gain (due to oxidation) of the alloy compositions at various oxidation temperatures in air.
  • FIG: i s hows a comparison of the oxidation resistance in air of alloy composition 9 with that of a typical prior art refractory metal alloy having the composition at. Nb; at. Zr; 5 at. Ti. It will be observed that the curve of composition 9 at l,300 C is well below that of the prior art alloy at l,200 C; this represents a significant improvement in oxidation resistance.
  • compositions 2, 4, 5, and 9 show significant improvement (about twice the oxidation resistance) over the prior art alloy when exposed to air at l,200 C.
  • compositions 4, 5, and 7 are significantly improved over the prior art composition at l,300 C.
  • Composition 2 was signficantly more oxidized at l,300 C than the prior art alloy composition.
  • compositions l, 3, 8, and 6 performed quite well at l,l00 C and showed no tendency to rapid oxidation.
  • the alloy compositions of this invention are markedly resistant to oxidation at high temperatures and show little tendency to rapidly accelerate in oxidation as compared to the prior art alloy. This renders them well suited for use as castings, forgings, etc., in air at high temperatures.
  • a refractory alloy composition consisting of: Columbium 32.5-46 percent; Titanium 50.5-57.5. percent; Beryllium 0-8 percent; Chromium 2.l5-2.6 percent; Silicon 0-8 percent; and Yttrium 0-0.l percent; all parts by weight.
  • a refractory alloy composition consisting of:

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Abstract

A refractory metal alloy comprising principally columbium and titanium, with lesser amounts of beryllium, chromium, silicon and yttrium provides excellent resistance to air oxidation at high temperature. The broad composition range is as follows: Columbium 32.5-46 percent; Titanium 50.5-57.5 percent; Beryllium 0-8 percent; Chromium 2.15-2.6 percent; Silicon 0-8 percent; and Yttrium 0-0.1 percent; all parts by weight.

Description

United States Patent [191 Anderson, Jr. et al.
[451 Aug. 21, 1973 I REFRACTORY METAL ALLIOYS FOR USE IN OXIDATION ENVIRONMENTS FOREIGN PATENTS OR APPLICATIONS 782,564 9/1957 Great Britain 75/l75.5 241,676 7/1969 U.S.S.R 75/l75.5
Primary Examiner-Charles N. Lovell "Kt?ori1ey aniEI TT AndErson:Willie Krawitz et al.
[5 7] ABSTRACT A refractory metal alloy comprising principally columbium and titanium, with lesser amounts of beryllium, chromium, silicon and yttrium provides excellent resistance to air oxidation at high temperature.
The broad composition range is as follows: Columbium 32.5-46 percent; Titanium 50.5-57.5 percent; Beryllium 0-8 percent; Chromium 2.l5-2.6 percent; Silicon 0-8 percent; and Yttrium 0-O.l percent; all parts by weight.
2 Claims, 4 Drawing Figures OXIDATION IN AIR OF A PRIOR ART ALLOY (450t- %Nb-50ot% Zr-5ot. Ti) oi I200C 8 THE PRESENT ALLOY AT I300 E 80 T. |2oo c f.- PRESENT ALLOY (COMPOSITION 9) 2 4 e 8 IO EXPOSURE TIME (Ht) Wt- GAIN(Mg /Cm PAIENIEDIIIII2I I975 sum 1 or 2 OXIDATION IN AIR OF A PRIOR ART A C 8 THE PRESENT ALLOY AT I300 LLOY (4501.70 Nb-50ut 450T%Nb5001./Zr5OI-% Ti I200C so I PRESENT ALLOY (COMPOSITION 9) f o 20 I300 c 2 4 e 8 IO 9 EXPOSURE TIME (Hr) OXIDATION IN AIRATI300 U z 60 z #5 EXPOSURE TIME (Hr) PATENTEI] AUG 21 I973 SHEET 2 BF 2 OXIDATION IN AIR AT |200C EXPOSURE TIME (Hr) OXIDATION lN AIR AT IIOO C E XPOSURE TIME (Hr) REFRACTORY METAL ALLOYS FOR USE IN OXIDATION ENVIRONMENTS BACKGROUND OF THE INVENTION This invention relates to new and improved refractory metal alloys. More specifically, this invention relates to refractory metal alloys having columbium and titanium as the principal alloy ingredients: beryllium, chromium, silicon and yttrium are minor constituents.
Refractory alloys have been employed as castings, forgings, etc., at high temperatures. Typical examples of refractory alloys are found in US. Pat. Nos. 3,086,859; 2,940,845; 2,99l,l97; 2,880,088; 2,819,960; 2,754,204; and 3,368,881.
However, their use at high temperature in an oxidizing environment is limited since the amount of oxidation continues with increasing time which eventually results in failure of the alloy as it becomes converted into an oxide.
It is, therefore, an object of the present invention to provide a refractory alloy which may be employed as castings, forgings, etc., in a high temperature, oxidizing environment such as air.
Other objects will be disclosed from the description and graphs to follow.
According to the invention, the broad range of the components in the refractory alloy is as follows:
Columbium 32.5-46 percent; Titanium 50.5-57.5 percent; Beryllium -8 percent; Chromium 2.l5-2.6 percent; Silicon 0-8 percent; and Yttrium 0-0.l percent; all parts by weight.
A narrower range of components is as follows:
Columbium 33.5-44.5 percent; Titanium 52-56 percent; Beryllium 0-7.5 percent; Chromium 22-25 percent; Silicon 0-7 percent, and Yttrium 0-0.l percent; all parts by weight.
Specific alloy compositions of this invention are:
was the measured as a function of the exposure time.
In the drawings, FIGS. 1-4 are graphs showing the relationship between exposure time and weight gain (due to oxidation) of the alloy compositions at various oxidation temperatures in air.
FIG: i s hows a comparison of the oxidation resistance in air of alloy composition 9 with that of a typical prior art refractory metal alloy having the composition at. Nb; at. Zr; 5 at. Ti. It will be observed that the curve of composition 9 at l,300 C is well below that of the prior art alloy at l,200 C; this represents a significant improvement in oxidation resistance.
As shown in FIG. 2, compositions 2, 4, 5, and 9 show significant improvement (about twice the oxidation resistance) over the prior art alloy when exposed to air at l,200 C.
In FIGT S, compositions 4, 5, and 7 are significantly improved over the prior art composition at l,300 C. Composition 2 was signficantly more oxidized at l,300 C than the prior art alloy composition.
In FIG. 4, compositions l, 3, 8, and 6 performed quite well at l,l00 C and showed no tendency to rapid oxidation.
Hence, the alloy compositions of this invention are markedly resistant to oxidation at high temperatures and show little tendency to rapidly accelerate in oxidation as compared to the prior art alloy. This renders them well suited for use as castings, forgings, etc., in air at high temperatures.
We claim: 1. A refractory alloy composition consisting of: Columbium 32.5-46 percent; Titanium 50.5-57.5. percent; Beryllium 0-8 percent; Chromium 2.l5-2.6 percent; Silicon 0-8 percent; and Yttrium 0-0.l percent; all parts by weight.
2. A refractory alloy composition consisting of:
Columbium Titanium Beryllium Chromium Slllcon Yttrium 44. 5 52.2 1. 0 2. 2 0 0. 1 44. 4 52. 2 0 2. 2 1. 1 0. 1 43. 4 52.2 1. 0 2. 2 1. 1 0. 1 42. 4 52. 2 2. 0 2. 2 1. 1 0. l 41. 4 52. 2 1. 0 2. 2 3. I 0. 1 40. 9 52. 2 3. 5 2. 2 l. 1 0. 1 39. 4 52. 2 1. 0 2. 2 5. 1 0. 1 38. 0 52. 2 7. 5 2. 2 0 0. 1 37. 4 52. 2 l. 0 2. 2 7.1 0.1 36. 9 52.2 7. 5 2. 2 l. 1 0. 1 33. 8 55. 9 I. 0 2. 5 6. 8 0
Columbium 33.5-44.5 percent; Titanium 52-56 percent; Beryllium 0-7.5 percent; Chromium 2.2-2.5 percent; Silicon 0-7 percent; and Yttrium 0-0.1
percent; all parts by weight.
* i I t

Claims (1)

  1. 2. A refractory alloy composition consisting of: Columbium 33.5-44.5 percent; Titanium 52-56 percent; Beryllium 0-7.5 percent; Chromium 2.2-2.5 percent; Silicon 0-7 percent; and Yttrium 0-0.1 percent; all parts by weight.
US00214352A 1971-12-30 1971-12-30 Refractory metal alloys for use in oxidation environments Expired - Lifetime US3753701A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU241676A1 (en) * Л. И. Гомозов, М. А. Скр бина, И. И. Раевский , О. С. Иванов Институт металлургии А. А. Байкова OKALINOUS RESISTANCE ON TITANIUM BASED ALLOY
GB782564A (en) * 1952-12-22 1957-09-11 Rem Cru Titanium Inc Improvements in or relating to titanium-aluminium base alloys
US2940845A (en) * 1958-02-24 1960-06-14 Kennecott Copper Corp Columbium-titanium base oxidationresistant alloys
US3028236A (en) * 1958-12-22 1962-04-03 Union Carbide Corp Columbium base alloy

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU241676A1 (en) * Л. И. Гомозов, М. А. Скр бина, И. И. Раевский , О. С. Иванов Институт металлургии А. А. Байкова OKALINOUS RESISTANCE ON TITANIUM BASED ALLOY
GB782564A (en) * 1952-12-22 1957-09-11 Rem Cru Titanium Inc Improvements in or relating to titanium-aluminium base alloys
US2940845A (en) * 1958-02-24 1960-06-14 Kennecott Copper Corp Columbium-titanium base oxidationresistant alloys
US3028236A (en) * 1958-12-22 1962-04-03 Union Carbide Corp Columbium base alloy

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