US4745022A
Expired / Lapsed
US
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Composite sintered silicon nitride material and cutting tool made therefrom
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1985-10-23
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Granted: 1988-05-17
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Expires: 2005-10-23
Abstract
Abstract Composite sintered Si3N4 material particularly suitable as a cutting tool material for cutting cast iron is composed of: a sintered Si3N4 substrate containing 0.1 to 10 weight % of Y2O3, 0.1 to 10 weight % of ZrO2 and if necessary 1 to 15 weight % of at least one member selected from the group consisting of compound and solid solution thereof of elements of IVa (except Zr), Va and VIa of the Periodic Table and the balance being of Si3N4; a first layer of Ti compound coated on the sintered Si3N4 substrate; a second layer of Al2O3 coated on the first layer; and the total thickness of the first and second layers being in the range of 1 to 20 microns. The above composite sintered Si3N4 material has an improved abrasive resistance particularly in the case of cutting cast iron at high speed, while retaining the excellent physical properties of Si3N4. Such a composite sintered Si3N4 material is useful for preparing a cutting tool of a long life time.
Inventors
- 👤 Masaya Miyake
- 👤 Akira Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:43
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
131 words
Composite sintered Si 3 N 4 material consisting of: a sintered Si 3 N 4 substrate containing 0.1 to 10 weight % of Y 2 O 3 , 0.1 to 10 weight % of ZrO 2 and 1 to 15 weight % of at least one member selected from the group consisting of carbide, nitride and carbonitride and solid solution thereof of elements of IVa (except Zr), Va and VIa of the Periodic Table and the balance being of Si 3 N 4 ; a first layer of Ti compound coated on the sintered Si 3 N 4 substrate; a second layer of Al 2 O 3 coated on the first layer; and the total thickness of the first and second layers being in the range of 1 to 20 microns.
Claim 2
Dependent Claim
131 words
Composite sintered Si 3 N 4 material consisting of: a sintered Si 3 N 4 substrate containing 0.1 to 10 weight % of Y 2 O 3 , 0.1 to 10 weight % of ZrO 2 and 1 to 15 weight % of at least one member selected from the group consisting of carbide, nitride and carbonitride and solid solution thereof of elements of IVa (except Zr), Va and VIa of the Periodic Table and the balance being of Si 3 N 4 ; a first layer of Ti compound coated on the sintered Si 3 N 4 substrate; a second layer of Al 2 O 3 coated on the first layer; and the total thickness of the first and second layers being in the range of 1 to 20 microns.
Claim 3
Dependent Claim
23 words
Composite sintered Si 3 N 4 material as claimed in claim 1, wherein ZrO 2 has been stabilized to cubic ZrO 2 .
Claim 4
Dependent Claim
44 words
Composite sintered Si 3 N 4 material as claimed in claim 2, wherein ZrO 2 has been stabilized to cubic ZrO 2 by the addition of at least one member selected from the group consisting of CaO, MgO and Y 2 O 3 .
Claim 5
Dependent Claim
30 words
Composite sintered Si 3 N 4 material as claimed in claim 1, wherein the mean grain size of the sintered Si 3 N 4 substrate is smaller than 3 microns.
Claim 6
Dependent Claim
27 words
Composite sintered Si 3 N 4 material as claimed in claim 1, wherein the first and second layers have respectively a thickness of 3 to 10 microns.
Claim 7
Dependent Claim
26 words
Composite sintered Si 3 N 4 material as claimed in claim 5, wherein the first and second layers have a substantially same thickness with each other.
Claim 8
Dependent Claim
24 words
Composite sintered Si 3 N 4 material as claimed in claim 1, wherein the first layer has a thickness of 0.5 to 10 microns.
Claim 9
Dependent Claim
24 words
Composite sintered Si 3 N 4 material as claimed in claim 1, wherein the second layer has a thickness of 1 to 10 microns.
Claim 10
Dependent Claim
40 words
Composite sintered Si 3 N 4 material as claimed in claim 1, wherein the first layer includes at least one member selected from the group consisting of Ti carbide, Ti nitride, Ti carbonitride, Ti oxide and the solid solution thereof.
Claim 11
Dependent Claim
149 words
Cutting tool mainly for use in cutting cast iron at high speed and comprising a blade tip of composite sintered Si 3 N 4 material consisting of a sintered Si 3 N 4 substrate containing 0.1 to 10 weight % of Y 2 O 3 , 0.1 to 10 weight % of ZrO 2 and 1 to 15 weight % of at least one member selected from the group consisting of carbide, nitride and carbonitride and solid solution thereof of elements of IVa (except Zr), Va and VIa of the Periodic Table and the balance being of Si 3 N 4 ; a first layer of Ti compound coated on the sintered Si 3 N 4 substrate; a second layer of Al 2 O 3 coated on the first layer; and the total thickness of the first and second layers being in the range of 1 to 20 microns.
Claim 12
Dependent Claim
149 words
Cutting tool mainly for use in cutting cast iron at high speed and comprising a blade tip of composite sintered Si 3 N 4 material consisting of a sintered Si 3 N 4 substrate containing 0.1 to 10 weight % of Y 2 O 3 , 0.1 to 10 weight % of ZrO 2 and 1 to 15 weight % of at least one member selected from the group consisting of carbide, nitride and carbonitride and solid solution thereof of elements of IVa (except Zr), Va and VIa of the Periodic Table and the balance being of Si 3 N 4 ; a first layer of Ti compound coated on the sintered Si 3 N 4 substrate; a second layer of Al 2 O 3 coated on the first layer; and the total thickness of the first and second layers being in the range of 1 to 20 microns.
Claim 13
Dependent Claim
18 words
Cutting tool as claimed in claim 10, wherein ZrO 2 has been stabilized to cubic ZrO 2 .
Claim 14
Dependent Claim
39 words
Cutting tool as claimed in claim 11, wherein ZrO 2 has been stabilized to cubic ZrO 2 by the addition of at least one member selected from the group consisting of CaO, MgO and Y 2 O 3 .
Claim 15
Dependent Claim
25 words
Cutting tool as claimed in claim 10, wherein the mean grain size of the sintered Si 3 N 4 substrate is smaller than 3 microns.
Claim 16
Dependent Claim
22 words
Cutting tool as claimed in claim 10, wherein the first and second layers have respectively a thickness of 3 to 10 microns.
Claim 17
Dependent Claim
21 words
Cutting tool as claimed in claim 14, wherein the first and second layers have a substantially same thickness with each other.
Claim 18
Dependent Claim
19 words
Cutting tool as claimed in claim 10, wherein the first layer has a thickness of 0.5 to 10 microns.
Claim 19
Dependent Claim
19 words
Cutting tool as claimed in claim 10, wherein the second layer has a thickness of 1 to 10 microns.
Claim 20
Dependent Claim
35 words
Cutting tool as claimed in claim 10, wherein the first layer includes at least one member selected from the group consisting of Ti carbide, Ti nitride, Ti carbonitride, Ti oxide and the solid solution thereof.
Claim 21
Dependent Claim
124 words
Composite sintered Si 3 N 4 material consisting of: a sintered Si 3 N 4 substrate containing 0.1 to 10 weight % of Y 2 O 3 , 0.1 to 10 weight % of ZrO 2 and 1 to 15 weight % of at least one member selected from the group consisting of carbide, nitride and carbonitride and their solid solution of Ti, W, Ta and V and the balance being of Si 3 N 4 ; a first layer of Ti compound coated on the sintered Si 3 N 4 substrate; a second layer of Al 2 O 3 coated on the first layer; and the total thickness of the first and second layers being in the range of 1 to 20 microns.
Claim 22
Dependent Claim
124 words
Composite sintered Si 3 N 4 material consisting of: a sintered Si 3 N 4 substrate containing 0.1 to 10 weight % of Y 2 O 3 , 0.1 to 10 weight % of ZrO 2 and 1 to 15 weight % of at least one member selected from the group consisting of carbide, nitride and carbonitride and their solid solution of Ti, W, Ta and V and the balance being of Si 3 N 4 ; a first layer of Ti compound coated on the sintered Si 3 N 4 substrate; a second layer of Al 2 O 3 coated on the first layer; and the total thickness of the first and second layers being in the range of 1 to 20 microns.
Claim 23
Dependent Claim
23 words
Composite sintered Si 3 N 4 material as claimed in claim 19, wherein ZrO 2 has been stabilized to cubic ZrO 2 .
Claim 24
Dependent Claim
44 words
Composite sintered Si 3 N 4 material as claimed in claim 20, wherein ZrO 2 has been stabilized to cubic ZrO 2 by the addition of at least one member selected from the group consisting of CaO, MgO and Y 2 O 3 .
Claim 25
Dependent Claim
30 words
Composite sintered Si 3 N 4 material as claimed in claim 19, wherein the mean grain size of the sintered Si 3 N 4 substrate is smaller than 3 microns.
Claim 26
Dependent Claim
27 words
Composite sintered Si 3 N 4 material as claimed in claim 19, wherein the first and second layers have respectively a thickness of 3 to 10 microns.
Claim 27
Dependent Claim
26 words
Composite sintered Si 3 N 4 material as claimed in claim 23, wherein the first and second layers have a substantially same thickness with each other.
Claim 28
Dependent Claim
24 words
Composite sintered Si 3 N 4 material as claimed in claim 19, wherein the first layer has a thickness of 0.5 to 10 microns.
Claim 29
Dependent Claim
24 words
Composite sintered Si 3 N 4 material as claimed in claim 19, wherein the second layer has a thickness of 1 to 10 microns.
Claim 30
Dependent Claim
40 words
Composite sintered Si 3 N 4 material as claimed in claim 19, wherein the first layer includes at least one member selected from the group consisting of Ti carbide, Ti nitride, Ti carbonitride, Ti oxide and the solid solution thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |