Patent US4003716A successfully refreshed from Google Patents.
US4003716A
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Cast cemented refractory metal carbides having improved sintered density
Assignee: GTE Sylvania Inc
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Filing: 1974-07-15
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Granted: 1977-01-18
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Expires: 1994-07-15
Abstract
Abstract Cemented carbide articles produced by tape casting a slurry of ingredients including organic resins and plasticizers, forming the cast tape into a desired shape and firing the tape, are improved by eliminating carbonaceous residue-forming ingredients from the organic portion of the slurry, resulting in reduced porosity of the fired article.
Inventors
- 👤 James Q. Steigelman
- 👤 Joseph J. Cleveland
- 👤 Richard N. Kleiner
- 👤 Frank Rymas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; B; B22; B22F; B22F3/00; B22F3/22; B22F5/00; B22F5/006; C04B35/638; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12083; Y10T428/12153; Y10T428/12389; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/26; Y10T428/269
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
108 words
A cemented refractory metal carbide article consisting essentially of from about 75 to 97 weight % of discrete particles of at least one refractory metal carbide distributed in a matrix of from about 3 to about 25 weight % of a lower melting binder metal, said article having a predetermined configuration including at least a portion having a thickness of from about 0.004 inches to about 0.08 inches defined by at least 2 uneroded formed surfaces, characterized in that said article exhibits A-type, B-type and C-type porosities in accordance with ASTM specification No. B-276-54 of up to and including A 3 , B 3 and C 3 .
Claim 2
Dependent Claim
108 words
A cemented refractory metal carbide article consisting essentially of from about 75 to 97 weight % of discrete particles of at least one refractory metal carbide distributed in a matrix of from about 3 to about 25 weight % of a lower melting binder metal, said article having a predetermined configuration including at least a portion having a thickness of from about 0.004 inches to about 0.08 inches defined by at least 2 uneroded formed surfaces, characterized in that said article exhibits A-type, B-type and C-type porosities in accordance with ASTM specification No. B-276-54 of up to and including A 3 , B 3 and C 3 .
Claim 3
Dependent Claim
19 words
An article according to claim 1 wherein at least a portion of said refractory metal carbide is tungsten carbide.
Claim 4
Dependent Claim
34 words
An article according to claim 2 wherein at least a portion of said lower melting binder metal is at least one iron group metal selected from the group consisting of iron, cobalt, and nickel.
Claim 5
Dependent Claim
98 words
A self-supporting flexible article having a composition consisting essentially of from about 85 to about 97% by weight of an inorganic portion consisting essentially of discrete particles of a refractory metal carbide, and a lower melting binder metal suspended in from about 3 to about 15 weight % of an inorganic portion consisting essentially of an organic plasticizer, a thermoplastic resin and a deflocculant, and having a thickness from about 0.006 to about 0.01 inches, characterized in that said organic portion upon heating to a temperature up to about 1000° C is substantially completely removed from the article.
Claim 6
Dependent Claim
98 words
A self-supporting flexible article having a composition consisting essentially of from about 85 to about 97% by weight of an inorganic portion consisting essentially of discrete particles of a refractory metal carbide, and a lower melting binder metal suspended in from about 3 to about 15 weight % of an inorganic portion consisting essentially of an organic plasticizer, a thermoplastic resin and a deflocculant, and having a thickness from about 0.006 to about 0.01 inches, characterized in that said organic portion upon heating to a temperature up to about 1000° C is substantially completely removed from the article.
Claim 7
Dependent Claim
19 words
An article according to claim 4 wherein at least a portion of said refractory metal carbide is tungsten carbide.
Claim 8
Dependent Claim
34 words
An article according to claim 4 wherein at least a portion of the lower melting binder metal is at least one iron group metal selected from the group consisting of iron, cobalt and nickel.
Claim 9
Dependent Claim
25 words
An article according to claim 4 wherein said plasticizer is a phthalate derivative, and said binder resin is a thermoplastic resin of the vinyl type.
Claim 10
Dependent Claim
160 words
A process for producing a flexible self-supporting article containing discrete particles of a refractory metal carbide, and a lower melting binder metal suspended in an organic portion, the process comprising: a. forming a slurry consisting essentially of from about 60 to 94 weight % of an inorganic portion consisting essentially of the carbide particles and particles of the lower melting binder metal, from about 2 to about 10 weight % of a solid organic portion consisting essentially of at least one plasticizer, at least one thermoplastic binder resin and at least one deflocculant, and from about 4 to about 30 weight percent of an organic solvent for said organic portion, (b) casting said slurry in the form of a relatively thin sheet, and (c) evaporating said solvent from said mixture to thereby form a flexible self-supporting article, characterized in that said organic portion upon heating to a temperature up to about 1000° C is substantially completely removed from the article.
Claim 11
Dependent Claim
160 words
A process for producing a flexible self-supporting article containing discrete particles of a refractory metal carbide, and a lower melting binder metal suspended in an organic portion, the process comprising: a. forming a slurry consisting essentially of from about 60 to 94 weight % of an inorganic portion consisting essentially of the carbide particles and particles of the lower melting binder metal, from about 2 to about 10 weight % of a solid organic portion consisting essentially of at least one plasticizer, at least one thermoplastic binder resin and at least one deflocculant, and from about 4 to about 30 weight percent of an organic solvent for said organic portion, (b) casting said slurry in the form of a relatively thin sheet, and (c) evaporating said solvent from said mixture to thereby form a flexible self-supporting article, characterized in that said organic portion upon heating to a temperature up to about 1000° C is substantially completely removed from the article.
Claim 12
Dependent Claim
18 words
Process according to claim 8 wherein at least a portion of said refractory metal carbide is tungsten carbide.
Claim 13
Dependent Claim
31 words
Process according to claim 8 wherein at least a portion of said lower melting binder metal is at least one metal selected from the iron group metals iron, cobalt, and nickel.
Claim 14
Dependent Claim
24 words
Process according to claim 8 wherein said plasticizer is a phthalate derivative, and said binder resin is a thermoplastic resin of the vinyl type.
Claim 15
Dependent Claim
18 words
A process according to claim 8 wherein said organic solvent has a boiling point below about 150° C.
Claim 16
Dependent Claim
23 words
Process according to claim 12 wherein said solvent comprises at least one organic solvent selected from the group consisting of methanol and toluene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |