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Tantalum-columbium-molybdenum-tungsten alloy
| Details |
Inventors: Huber, Jr., Louis E.; Schwartz, Harry D.;
Assignee: Cabot Corporation (Kokomo, IN)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Disclosed is a novel refractory metal alloy that retains the essential characteristics of pure tantalum and, additionally, has improved engineering characteristics and may be produced at a lower cost than pure tantalum. The alloy nominally contains, by weight, about 58% tantalum, about 2.0% molybdenum, about 2.5% tungsten and about 37.5% columbium. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A refractory metal alloy consisting essentially of, in weight percent, tantalum 56 to 68, molybdenum 1.
5 to 5.
0, tungsten 2.
0 to 5.
0 and the balance columbium plus normal impurities wherein the ratio Mo:W is within the range 0.
5 to 2 to provide an outstanding combination of engineering properties.
2.
The alloy of claim 1 wherein tantalum is 56 to 66, molybdenum 1.
5 to 3.
0 and tungsten 2.
0 to 3.
0.
3.
The alloy of claim 1 wherein tantalum is about 58, molybdenum is about 2.
0, tungsten is about 2.
5 and the columbium is about 37.
5.
Description:
This invention relates to a tantalum base alloy characterized by having an optimum combination of properties, and, more particularly, to an alloy containing columbium, molybdenum, tungsten and the balance tantalum.
PRIOR ART Many columbium and tantalum alloys are known in the prior art.
Table 1 presents the composition ranges of a group of such alloys disclosed in U.
S.
Patents.
U.
S.
Pat.
No.
3,186,837 relates to a columbium-tantalum base alloy.
The alloy is disclosed as a columbium base alloy requiring effective nickel and titanium contents for corrosion resistance and two-phase alloy structure, respectively.
U.
S.
Pat.
No.
3,188,205 discloses a columbium base alloy containing effective ranges of titanium, zirconium, tungsten and molybdenum and a maximum of 35% tantalum.
U.
S.
Pat.
No.
3,188,206 is a related patent disclosing a somewhat similar alloy (tungsten and molybdenum free) with a maximum of 40% tantalum.
U.
S.
Pat.
No.
3,592,639 relates to a ternany TA-W-MO alloy.
Molybdenum is limited to 0.
5% maximum to promote smaller grain size in the alloy.
U.
S.
Pat.
No.
3,346,379 relates to a predominately columbium alloy (over 55%) containing requirements from the group tungsten, molybdenum, iron, chromium and zirconium.
Only 5% maximum tantalum is tolerated as an impurity.
U.
S.
Pat.
No.
1,588,518 mentions practically the entire scope of nickel and cobalt base superalloys and refractory metals: 25-99% Ta+Cb, 1-75% Ni+Co, 5-30% Cr+W+Mo
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