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Nickel and cobalt alloys which contain tungsten aand carbon and have been processed by rapid solidification process and method
| Details |
Inventors: Ray, Ranjan; Panchanathan, Viswanathan;
Assignee: Marko Materials, Inc. (No. Billerica, MA)
Primary Examiner: Metz; Andrew
Assistant Examiner: Kastler; S.
Attorney, Agent or Firm:
New nickel and cobalt base alloys containing tungsten and carbon are disclosed. The alloys are subjected to rapid solidification processing (RSP) technique which produces cooling rates between 10.sup.5 .degree. to 10.sup.7 .degree. C./sec. The as-quenched ribbon, powder, etc. consists predominantly of amorphous phase. The amorphous phase is subjected to suitable heat treatments so as to produce a transformation to a microcrystalline alloy which includes carbides; this heat treated alloy exhibits high hardness combined with toughness for many applications wherein superhard materials are required. |
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DETAILED DESCRIPTION OF THE INVENTION In accordance with the present invention nickel and cobalt base alloys containing 15-35 atom percent of tungsten are alloyed with 0-10 atom percent of one or more of chromium and iron, 1-4 atom percent of boron and 5-25 atom percent of carbon.
The alloys may also contain limited amounts of other elements which are commercially found in nickel and cobalt base alloys without changing the essential behavior of the alloys.
Typical examples include: Ni.
sub.
32 Co.
sub.
30 W.
sub.
25 C.
sub.
10 B.
sub.
3, Ni.
sub.
32 Co.
sub.
25 W.
sub.
30 C.
sub.
10 B.
sub.
3, Co.
sub.
29 Ni.
sub.
30 W.
sub.
25 C.
sub.
13 B.
sub.
3, Ni.
sub.
50 W.
sub.
30 B.
sub.
1 C.
sub.
19, Co.
sub.
50 W.
sub.
35 B.
sub.
1 C.
sub.
14, Ni.
sub.
58 W.
sub.
20 B.
sub.
2 C.
sub.
20, Co.
sub.
60 W.
sub.
18 C.
sub.
20 B.
sub.
2, Ni.
sub.
33 Co.
sub.
25 W.
sub.
20 Cr.
sub.
5 Fe.
sub.
2 C.
sub.
12 B.
sub.
3, Ni.
sub.
35 Co.
sub.
35 W.
sub.
15 Cr.
sub.
5 B.
sub.
2 C.
sub.
8, and Co.
sub.
55 Ni.
sub.
15 W.
sub.
15 Cr.
sub.
5 B.
sub.
2 C.
sub.
8.
The alloys of the present invention upon rapid solidification processing the melt by melt-spin chill casting at cooling rates of the order of 10.
sup.
5 to 10.
sup.
7 .
degree.
C.
/second form brittle ribbons consisting predominantly of metallic glass (i.
e.
amorphous) phase with a high degree of compositional uniformity and high hardness 1200-1900 Kg/mm.
sup.
2).
The brittle ribbons are readily pulverized into powders having particle size less than 4 U.
S.
mesh using standard comminution techniques.
The powder is consolidated into bulk parts using powder metallurgical techniques, e.
g.
hot isostatic pressing, optionally followed by heat treatments for optimum properties.
The above powder has preferred particle size less than 60 mesh (U.
S.
Standard) comprising platelets having an average thickness of less than 0.
1 mm and each platelet being characterized by an irregularly shaped outline resulting from fracture thereof.
The bulk alloys are crystalline, such material being tough and having high hardness and strength compared to conventional alloys.
The melt-spinning method referred to herein includes any of the processes such as single roll chill block casting, double roll quenching, melt extraction, melt drag, etc
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Semiconductor manufacture 
