US5603075A
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US
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Corrosion resistant cermet wear parts
Assignee: Kennametal Inc
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Filing: 1995-03-03
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Granted: 1997-02-11
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Expires: 2015-03-03
Abstract
Abstract A corrosion resistant cermet comprises a ceramic component (e.g., WC) and a binder alloy comprised of a major component (e.g., one or more of iron, nickel, cobalt, their mixtures, and their alloys) and at least one additive component (e.g., one or more of ruthenium, rhodium, palladium, osmium, iridium, and platinum). Plungers for hyper compressors used in the corrosive environments generated during the manufacture of low density polyethylene (LDPE) or ethylene copolymers are an example of the use of the corrosion resistant cermet.
Inventors
- 👤 William M. Stoll
- 👤 James P. Materkowski
- 👤 Ted R. Massa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:14
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/005; C22C29/02; C22C29/06; C22C29/067; F; F04; F04B; F04B39/00; F04B39/0005; F04B53/00; F04B53/14; F04B15/00; F04B15/04; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0466; F05C2201/90; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/0813; F05C2203/0821; F05C2203/083; F05C2225/00; F05C2225/04; F05C2253/00; F05C2253/12; Y; Y10; Y10S; Y10S977/00; Y10S977/70; Y10S977/773; Y10S977/775; Y10S977/776; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12146
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
121 words
A corrosion and wear resistant cermet composition comprising: (a) at least one ceramic component comprised of at least one of boride(s), carbide(s), nitride(s), oxide(s), silicide(s), their mixtures, their solutions, and combinations thereof; and (b) between about 6-19% by weight binder alloy comprised of a major component comprising one or more of iron, nickel, cobalt, their mixtures, and their alloys and an additive component comprising between about 26-65% by weight of the binder alloy and at least one of ruthenium, rhodium, palladium, osmium, iridium, platinum, their alloy, and mixtures thereof, wherein the additive component imparts corrosion resistance against at least one of acids, bases, salts, lubricants, gasses, silicates, or any combination of the preceding to the corrosion and wear resistant cermet composition.
Claim 2
Dependent Claim
121 words
A corrosion and wear resistant cermet composition comprising: (a) at least one ceramic component comprised of at least one of boride(s), carbide(s), nitride(s), oxide(s), silicide(s), their mixtures, their solutions, and combinations thereof; and (b) between about 6-19% by weight binder alloy comprised of a major component comprising one or more of iron, nickel, cobalt, their mixtures, and their alloys and an additive component comprising between about 26-65% by weight of the binder alloy and at least one of ruthenium, rhodium, palladium, osmium, iridium, platinum, their alloy, and mixtures thereof, wherein the additive component imparts corrosion resistance against at least one of acids, bases, salts, lubricants, gasses, silicates, or any combination of the preceding to the corrosion and wear resistant cermet composition.
Claim 3
Dependent Claim
26 words
The corrosion and wear resistant cermet composition according to claim 1, wherein the additive component comprises from between about 26-60% by weight of the binder alloy.
Claim 4
Dependent Claim
38 words
The corrosion and wear resistant cermet composition according to claim 1, wherein the additive component comprises between about 26-34% by weight of the binder alloy and the corrosion and wear resistant cermet composition is resistant to acid/water solutions.
Claim 5
Dependent Claim
38 words
The corrosion and wear resistant cermet composition according to claim 1, wherein the at least one ceramic component comprises at least one carbide of one or more of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W.
Claim 6
Dependent Claim
20 words
The corrosion and wear resistant cermet composition according to claim 4, wherein said at least one carbide comprises tungsten carbide.
Claim 7
Dependent Claim
26 words
The corrosion and wear resistant cermet composition according to claim 1, wherein the corrosion and wear resistant cermet composition is corrosion resistant to organic acid solutions.
Claim 8
Dependent Claim
34 words
The corrosion and wear resistant cermet composition according to claim 5, wherein the at least one ceramic component further comprises at least one carbide of one or more of Ti, Nb, W, and Ta.
Claim 9
Dependent Claim
49 words
The corrosion and wear resistant cermet composition according to claim 5, wherein the corrosion and wear resistant cermet composition comprises a ruthenium-cobalt or a ruthenium-cobalt-tungsten cemented tungsten carbide which is resistant to solutions of water and at least one of formic acid, acetic acid, maleic acid, and methacrylic acid.
Claim 10
Dependent Claim
50 words
The corrosion and wear resistant cermet composition according to claim 5, wherein the corrosion and wear resistant cermet composition comprises a ruthenium-cobalt or a ruthenium-cobalt-tungsten cemented tungsten carbide which is resistant to solutions of water and at least one of sulfuric acid, nitric acid, hydrochloric acid, salt, and hydrazine mono-hydrate.
Claim 11
Dependent Claim
48 words
The corrosion and wear resistant cermet composition according to claim 8, wherein a corrosion rate of the corrosion and wear resistant cermet composition after about seven (7) days at about 50° C. (122° F.) is not greater than about 300 m.d.d. in a one (1)% organic acid/water solution.
Claim 12
Dependent Claim
47 words
The corrosion and wear resistant cermet composition according to claim 9, wherein a corrosion rate of the corrosion and wear resistant cermet composition after about seven (7) days at about 65° C. (149° F.) is not greater than about 80 m.d.d. in five (5)% mineral acid/water solutions.
Claim 13
Dependent Claim
28 words
The corrosion and wear resistant cermet composition according claim 2, wherein the binder alloy comprises between about 8-17% by weight of the corrosion and wear resistant cermet composition.
Claim 14
Dependent Claim
25 words
The corrosion and wear resistant cermet composition according claim 1, wherein the additive component comprises ruthenium comprising about 26-40% by weight of the binder alloy.
Claim 15
Dependent Claim
28 words
The corrosion and wear resistant cermet composition according claim 13, wherein the binder alloy comprises between about 8-17% by weight of the corrosion and wear resistant cermet composition.
Claim 16
Dependent Claim
29 words
The corrosion and wear resistant cermet composition according to claim 8, wherein the binder alloy comprises between about 8-17% by weight of the corrosion and wear resistant cermet composition.
Claim 17
Dependent Claim
28 words
The corrosion and wear resistant cermet composition to claim 3, wherein the binder alloy comprises between about 8-17% by weight of the corrosion and wear resistant cermet composition.
Claim 18
Dependent Claim
29 words
The corrosion and wear resistant cermet composition claim 1, wherein the additive component comprises ruthenium comprising at least about 26% by weight of a cobalt or cobalt-tungsten binder alloy.
Claim 19
Dependent Claim
28 words
The corrosion and wear resistant cermet composition to claim 9, wherein the binder alloy comprises between about 8-17% by weight of the corrosion and wear resistant cermet composition.
Claim 20
Dependent Claim
132 words
A corrosion and wear resistant cermet composition comprising: (a) tungsten carbide and (b) between about 6-19% by weight binder alloy comprising cobalt and between about 26-65% by weight ruthenium, wherein the combination of the cobalt and ruthenium imparts improved corrosion resistance in acid/water solutions comprised of at least one of formic acid, acetic acid, methacrylic acid, and maleic acid wherein the corrosion and wear resistant cermet composition has: a Rockwell A hardness of at least about 85; a transverse rupture strength of at least about 1.7 GPa (250 ksi); and a corrosion rate after about seven (7) days at about 50° C. (122° F.) in a one (1)% acid/water solutions comprised of at least one of formic acid, acetic acid, methacrylic acid, and maleic acid of not greater than about 120 m.d.d.
Claim 21
Dependent Claim
132 words
A corrosion and wear resistant cermet composition comprising: (a) tungsten carbide and (b) between about 6-19% by weight binder alloy comprising cobalt and between about 26-65% by weight ruthenium, wherein the combination of the cobalt and ruthenium imparts improved corrosion resistance in acid/water solutions comprised of at least one of formic acid, acetic acid, methacrylic acid, and maleic acid wherein the corrosion and wear resistant cermet composition has: a Rockwell A hardness of at least about 85; a transverse rupture strength of at least about 1.7 GPa (250 ksi); and a corrosion rate after about seven (7) days at about 50° C. (122° F.) in a one (1)% acid/water solutions comprised of at least one of formic acid, acetic acid, methacrylic acid, and maleic acid of not greater than about 120 m.d.d.
Claim 22
Dependent Claim
21 words
The corrosion and wear resistant cermet composition according to claim 19, wherein ruthenium comprises at most 60% of the binder alloy.
Claim 23
Dependent Claim
51 words
The corrosion and wear resistant cermet composition according to claim 19, wherein the binder alloy comprises between 8-17% of the cermet, ruthenium comprises at most 40% of the binder alloy, the transverse rupture strength is at least 2.8 GPa (310 ksi), and the corrosion rates are no greater than 80 m.d.d.
Claim 24
Dependent Claim
68 words
The corrosion and wear resistant cermet composition according to claim 19, wherein the cermet comprises an apparatus or a part of an apparatus comprising at least one of a plunger for hyper compressors, a seal ring, an orifice plate, a bushing, a punch or die, a bearing, a valve or pump component, a nozzle, a high pressure water intensifier, a diamond compaction component, and a rolling mill roll.
Claim 25
Dependent Claim
21 words
The corrosion and wear resistant cermet composition according to claim 19, wherein the Rockwell A hardness is up to about 92.
Claim 26
Dependent Claim
31 words
The corrosion and wear resistant cermet composition according to claim 19, wherein the tungsten carbide further comprises at least one carbide of one or more of Ti, Nb, W, and Ta.
Claim 27
Dependent Claim
28 words
The corrosion and wear resistant cermet composition according claim 19, wherein the binder alloy comprises between about 8-17% by weight of the corrosion and wear resistant cermet composition.
Claim 28
Dependent Claim
25 words
The corrosion and wear resistant cermet composition according to claim 19, wherein the additive component comprises between about 26-34% by weight of the binder alloy.
Claim 29
Dependent Claim
145 words
A corrosion and wear resistant cermet composition comprising: (a) tungsten carbide and (b) between about 6-19% by weight binder alloy comprising cobalt and between about 26-65% by weight ruthenium, wherein the combination of the cobalt and ruthenium imparts improved corrosion resistance in acid/water solutions comprised of at least one of sulfuric acid, nitric acid, and hydrochloric acid; sea water; or hydrazine mono-hydrate/water solutions wherein the corrosion and wear resistant cermet composition has: a Rockwell A hardness of at least about 85; a transverse rupture strength of at least about 1.7 GPa (250 ksi); and a corrosion rate after about seven (7) days at about 65° C. (149° F.) in: a five (5)% acid/water solution comprised of at least one of sulfuric acid and nitric acid; a 37% hydrochloric acid/water solution; synthetic sea water; or 98% hydrazine mono-hydrate/water solution of not greater than about 80 m.d.d.
Claim 30
Dependent Claim
145 words
A corrosion and wear resistant cermet composition comprising: (a) tungsten carbide and (b) between about 6-19% by weight binder alloy comprising cobalt and between about 26-65% by weight ruthenium, wherein the combination of the cobalt and ruthenium imparts improved corrosion resistance in acid/water solutions comprised of at least one of sulfuric acid, nitric acid, and hydrochloric acid; sea water; or hydrazine mono-hydrate/water solutions wherein the corrosion and wear resistant cermet composition has: a Rockwell A hardness of at least about 85; a transverse rupture strength of at least about 1.7 GPa (250 ksi); and a corrosion rate after about seven (7) days at about 65° C. (149° F.) in: a five (5)% acid/water solution comprised of at least one of sulfuric acid and nitric acid; a 37% hydrochloric acid/water solution; synthetic sea water; or 98% hydrazine mono-hydrate/water solution of not greater than about 80 m.d.d.
Claim 31
Dependent Claim
22 words
The corrosion and wear resistant cermet composition according to claim 27, wherein the ruthenium comprises between about 26-40% of the binder alloy.
Claim 32
Dependent Claim
42 words
The corrosion and wear resistant cermet composition according to claim 27, wherein the binder alloy comprises between 8-17% of the cermet, the transverse rupture strength is at least 2.8 GPa (310 ksi), and the corrosion rates are no greater than 80 m.d.d.
Claim 33
Dependent Claim
62 words
The corrosion and wear resistant cermet composition according to claim 27, wherein the cermet comprises an apparatus comprising at least one of a plunger for hyper compressors, a seal ring, an orifice plate, a bushing, a punch or die, a bearing, a valve or pump component, a nozzle, a high pressure water intensifier, a diamond compaction component, and a rolling mill roll.
Claim 34
Dependent Claim
21 words
The corrosion and wear resistant cermet composition according to claim 27, wherein the Rockwell A hardness is up to about 92.
Claim 35
Dependent Claim
31 words
The corrosion and wear resistant cermet composition according to claim 27, wherein the tungsten carbide further comprises at least one carbide of one or more of Ti, Nb, W, and Ta.
Claim 36
Dependent Claim
28 words
The corrosion and wear resistant cermet composition according claim 27, wherein the binder alloy comprises between about 8-17% by weight of the corrosion and wear resistant cermet composition.
Claim 37
Dependent Claim
25 words
The corrosion and wear resistant cermet composition according to claim 27, wherein the additive component comprises between about 26-34% by weight of the binder alloy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |