EP0344421A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Burnt surface sintered alloy with and without a rigid surface film coating and process for producing the alloy
Assignee: Tungaloy Corp
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Filing: 1989-03-22
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Granted: —
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Expires: 2009-03-22
Abstract
Abstract There are disclosed a surface refined sintered alloy with a burnt surface, comprising 75 to 95 % by weight of a hard phase containing Ti, C and N as the essential components and otherwise comprising at least one of Zr, Hf, V, Nb, Ta, Cr, Mo and W and the balance of the alloy comprising a binder phase composed mainly of Co and/or Ni and inevitable impurities, wherein the sintered alloy satisfies at least one conditions selected from the group consisting of the following (1) to (3): (1) the average grain size of the hard phase in a surface layer to the inner portion of 0.05 mm from the burnt surface of the sintered alloy is 0.8 to 1.2-fold of the average grain size of the hard phase in the inner portion of the sintered alloy excluding the surface layer; (2) the average content of the binder phase in the surface layer to the inner portion of 0.05 mm from the burnt surface of the sintered alloy is 0.7 to 1.2-fold of the average content of the binder phase in the inner portion of the sintered alloy; and (3) the average hardness in the surface layer to the inner portion of 0.05 mm from the burnt surface of the sintered alloy is 0.95 to 1.10-fold of the average hardness in the inner portion of of the sintered alloy; and a process for producing the same.
Inventors
- 👤 Takeshi C/O Toshiba Tungaloy Co. Ltd. Saitoh
- 👤 Tuyoshi C/O Toshiba Tungaloy Co. Ltd. Saito
- 👤 Mitsuo C/O Toshiba Tungaloy Co. Ltd. Ueki
- 👤 Hisashi Suzuki
- 👤 Keiichi C/O Toshiba Tungaloy Co. Ltd. Kobori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 23:40
CPC Classifications
C; C23; C23C; C23C30/00; C23C30/005; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C29/00; C22C29/02; C22C29/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12021; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12458; Y10T428/12993; Y10T428/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
227 words
A surface refined sintered alloy with a burnt surface, comprising 75 to 95 % by weight of a hard phase containing Ti, C (carbon) and N (nitrogen) as the essential components and otherwise comprising at least one of Zr, Hf, V, Nb, Ta, Cr, Mo and W and the balance of the alloy comprising a binder phase composed mainly of Co and/or Ni and inevitable impurities, wherein said sintered alloy satisfies at least one conditions selected from the group consisting of the following (1) to (3): (1) the average grain size of the hard phase in a surface layer to the inner portion of 0.05 mm from the burnt surface of said sintered alloy is 0.8 to 1.2-fold of the average grain size of the hard phase in the inner portion of the sintered alloy excluding said surface layer; (2) the average content of the binder phase in the surface layer to the inner portion of 0.05 mm from the burnt surface of said sintered alloy is 0.7 to 1.2-fold of the average content of the binder phase in the inner portion of the sintered alloy; and (3) the average hardness in the surface layer to the inner portion of 0.05 mm from the burnt surface of said sintered alloy is 0.95 to 1.10-fold of the average hardness in the inner portion of of the sintered alloy.
Claim 2
Dependent Claim
227 words
A surface refined sintered alloy with a burnt surface, comprising 75 to 95 % by weight of a hard phase containing Ti, C (carbon) and N (nitrogen) as the essential components and otherwise comprising at least one of Zr, Hf, V, Nb, Ta, Cr, Mo and W and the balance of the alloy comprising a binder phase composed mainly of Co and/or Ni and inevitable impurities, wherein said sintered alloy satisfies at least one conditions selected from the group consisting of the following (1) to (3): (1) the average grain size of the hard phase in a surface layer to the inner portion of 0.05 mm from the burnt surface of said sintered alloy is 0.8 to 1.2-fold of the average grain size of the hard phase in the inner portion of the sintered alloy excluding said surface layer; (2) the average content of the binder phase in the surface layer to the inner portion of 0.05 mm from the burnt surface of said sintered alloy is 0.7 to 1.2-fold of the average content of the binder phase in the inner portion of the sintered alloy; and (3) the average hardness in the surface layer to the inner portion of 0.05 mm from the burnt surface of said sintered alloy is 0.95 to 1.10-fold of the average hardness in the inner portion of of the sintered alloy.
Claim 3
Dependent Claim
39 words
A coated surface refined sintered alloy, comprising the surface refined sintered alloy according to Claim 1 and a rigid film having higher hardness than said surface refined sintered alloy covered on the surface of said surface refined sintered alloy.
Claim 4
Dependent Claim
23 words
A coated surface refined sintered alloy according to Claim 2, wherein said rigid film has a thickness of about 0.1 to 10 µm.
Claim 5
Dependent Claim
43 words
A surface refined sintered alloy according to Claim 1 or 2, wherein the hard phase comprises at least one of TiC, TiN, Ti(C,N), Ti(M,C), (Ti,M)N and (Ti,M)(C,N) wherein M represents at least one of Zr, Hf, V, Nb, Ta, Cr, Mo and W.
Claim 6
Dependent Claim
55 words
A surface refined sintered alloy according to Claim 1 or 2, wherein the binding phase comprises at least 50 % by volume of Co and/or Ni, and the metal elements in the compounds selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Fe Al and Mn, as the remainder.
Claim 7
Dependent Claim
190 words
A process for producing a surface refined sintered alloy with a burnt surface, comprising 75 to 95 % by weight of a hard phase containing Ti, C and N as the essential components and otherwise comprising at least one of Zr, Hf, V, Nb, Ta, Cr, Mo and W and the balance of the alloy comprising a binder phase composed mainly of Co and/or Ni and inevitable impurities from a powdery mixture comprising at least one powder of carbides, nitrides of the metals of the group 4a, 5a, 6a of periodic table and mutual solid solutions of these and powder mainly composed of Co and/or Ni via a sintering step, wherein the temperature and the atmosphere in said sintering step are controlled such that the atmosphere in said sintering step are controlled such that the atmosphere may be vacuum or an atmosphere of an inert gas in the first temperature region of 1300 °C or lower, nitrogen gas atmosphere of 0.1 to 20 Torr in the second temperature range over 1300 °C, and further the nitrogen pressure in said second temperature region is made higher as the temperature is higher.
Claim 8
Dependent Claim
190 words
A process for producing a surface refined sintered alloy with a burnt surface, comprising 75 to 95 % by weight of a hard phase containing Ti, C and N as the essential components and otherwise comprising at least one of Zr, Hf, V, Nb, Ta, Cr, Mo and W and the balance of the alloy comprising a binder phase composed mainly of Co and/or Ni and inevitable impurities from a powdery mixture comprising at least one powder of carbides, nitrides of the metals of the group 4a, 5a, 6a of periodic table and mutual solid solutions of these and powder mainly composed of Co and/or Ni via a sintering step, wherein the temperature and the atmosphere in said sintering step are controlled such that the atmosphere in said sintering step are controlled such that the atmosphere may be vacuum or an atmosphere of an inert gas in the first temperature region of 1300 °C or lower, nitrogen gas atmosphere of 0.1 to 20 Torr in the second temperature range over 1300 °C, and further the nitrogen pressure in said second temperature region is made higher as the temperature is higher.
Claim 9
Dependent Claim
69 words
A process according to Claim 6, wherein a rigid film comprising a nitride film is further formed on the surface of the surface refined sintered alloy by maintaining further the surface of the surface refined sintered alloy after completion of sintering in the second temperature region in the process for producing the surface refined sintered alloy under an atmosphere of high nitrogen pressure for a certain period of time.
Claim 10
Dependent Claim
19 words
A process according to Claim 7, wherein the rigid film has a thickness of about 0.1 to 10 µm.
References Cited (Backward Citations)
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