Patent US4777155A successfully refreshed from Google Patents.
US4777155A
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Sintered member of aluminum nitride base reinforced composite material
Assignee: Niterra Co Ltd
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Filing: 1986-09-12
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Granted: 1988-10-11
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Expires: 2006-09-12
Abstract
Abstract The disclosure relates to a sintered aluminum nitride base composite material which consists essentially of 5-50 wt % of SiC whiskers, 0.5-10 wt % of sintering assistant(s) selected from SiO 2 , Y 2 O 3 , CaO, Al 2 O 3 , Mo, W, Mo 2 C, WC and oxides of elements of the lanthanide series and the balance of AlN. By virtue of dispersion of SiC whiskers in AlN base ceramic matrix the sintered material is very enhanced in strength, toughness and hardness and exhibits increased heat conductivity. The sintered material provides excellent cutting tools since Rockwell superficial hardness, 45N scale, can be made higher than 85.
Inventors
- 👤 Hidetoshi Baba
- 👤 Hisashi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:43
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/575; C04B35/58; C04B35/581; C04B35/622; C04B35/64; C04B35/645; C04B35/71; C04B35/78; C04B35/80; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3208; C04B2235/3217; C04B2235/3224; C04B2235/3225; C04B2235/34; C04B2235/3418; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/3839; C04B2235/3847; C04B2235/3852; C04B2235/3865; C04B2235/40; C04B2235/404; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/526; C04B2235/5264; C04B2235/5276; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5445; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; C04B2235/9607
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
A sintered member formed of a composite material consisting essentially of: 5-50 wt% of SiC whiskers; 0.5-10 wt% of at least one sintering assistant ingredient which is selected from the group consisting of SiO 2 , Y 2 O 3 , CaO, Al 2 O 3 , Mo, W, Mo 2 C, WC and oxides of lanthanide series elements of atomic numbers through 57 to 71; and the balance of AlN.
Claim 2
Dependent Claim
71 words
A sintered member formed of a composite material consisting essentially of: 5-50 wt% of SiC whiskers; 0.5-10 wt% of at least one sintering assistant ingredient which is selected from the group consisting of SiO 2 , Y 2 O 3 , CaO, Al 2 O 3 , Mo, W, Mo 2 C, WC and oxides of lanthanide series elements of atomic numbers through 57 to 71; and the balance of AlN.
Claim 3
Dependent Claim
22 words
A sintered member according to claim 1, wherein said SiC whiskers are from about 0.1 μm to about 1.5 μm in diameter.
Claim 4
Dependent Claim
28 words
A sintered member according to claim 1, wherein the hardness of the sintered composite material is not lower than 85 in terms of Rockwell superficial hardness 45N scale.
Claim 5
Dependent Claim
72 words
A cutting tool formed of a sintered composite material consisting essentially of 5-50 wt% of SiC whiskers, 0.5-10 wt% of at least one sintering assistant ingredient which is selected from the group consisting of SiO 2 , Y 2 O 3 , CaO, Al 2 O 3 , Mo, W, Mo 2 C, WC and oxides of lanthanide series elements of atomic numbers through 57 to 71, and the balance of AlN.
Claim 6
Dependent Claim
72 words
A cutting tool formed of a sintered composite material consisting essentially of 5-50 wt% of SiC whiskers, 0.5-10 wt% of at least one sintering assistant ingredient which is selected from the group consisting of SiO 2 , Y 2 O 3 , CaO, Al 2 O 3 , Mo, W, Mo 2 C, WC and oxides of lanthanide series elements of atomic numbers through 57 to 71, and the balance of AlN.
Claim 7
Dependent Claim
28 words
A cutting tool according to claim 4, wherein the hardness of the sintered composite material is not lower than 85.5 in terms of Rockwell superficial hardness 45N scale.
Claim 8
Dependent Claim
17 words
A cutting tool according to claim 5 wherein the heat conductivity is not less than 0.13 cal/cm·sec·°C.
Claim 9
Dependent Claim
20 words
A cutting tool according to claim 5 wherein the toughness is not less than 6.0 MN/m 3 / 2 .
Claim 10
Dependent Claim
22 words
A cutting tool according to claim 5 wherein the deflective strength of the material is not less than 65 Kg/mm 2 .
Claim 11
Dependent Claim
25 words
A cutting tool according to claim 4 wherein the SiC whiskers are single crystals of SiC having a diameter from about 0.1 to 1.5 micrometers.
Claim 12
Dependent Claim
16 words
A sintered member according to claim 1 wherein the amount of SiC whiskers is 30 wt%.
Claim 13
Dependent Claim
33 words
A sintered member according to claim 1 wherein the at least one sintering assistant is selected from the group consisting of SiO 2 , Y 2 O 3 , CaO, Mo, and W.
Claim 14
Dependent Claim
125 words
A cutting tool formed of a sintered composite material consisting essentially of 5-50 wt.% of SiC whiskers, 0.5-10 wt.% of at least one sintering assistant ingredient which is selected from the group consisting of SiO 2 , Y 2 O 3 , CaO, Al 2 O 3 , Mo, W, Mo 2 C, WC and oxides of lanthanide series elements of atomic numbers 57 through 71, and the balance AlN wherein the hardness of the sintered composite material is not lower than 85 in terms of Rockwell superficial hardness 45N scale, the heat conductivity is not less than 0.13 cal/cm·sec·°C., the toughness is not less than 6.0 MN/m 3/2 , and the deflective strength of the material is not less than 65 Kg/mm 2 .
Claim 15
Dependent Claim
125 words
A cutting tool formed of a sintered composite material consisting essentially of 5-50 wt.% of SiC whiskers, 0.5-10 wt.% of at least one sintering assistant ingredient which is selected from the group consisting of SiO 2 , Y 2 O 3 , CaO, Al 2 O 3 , Mo, W, Mo 2 C, WC and oxides of lanthanide series elements of atomic numbers 57 through 71, and the balance AlN wherein the hardness of the sintered composite material is not lower than 85 in terms of Rockwell superficial hardness 45N scale, the heat conductivity is not less than 0.13 cal/cm·sec·°C., the toughness is not less than 6.0 MN/m 3/2 , and the deflective strength of the material is not less than 65 Kg/mm 2 .
Claim 16
Dependent Claim
64 words
A sintered member according to claim 1 wherein the hardness of the sintered composite material is not lower than 85 in terms of Rockwell superficial hardness 45N scale, the heat conductivity is not less than 0.13 cal/cm·sec·°C., the toughness is not less than 6.0 MN/m 3 / 2 , and the deflective strength of the material is not less than 65 Kg/mm 2 .
Claim 17
Dependent Claim
23 words
A sintered member according to claim 1, wherein at least one of said sintering assistant ingredients consists of Al 2 O 3 .
Claim 18
Dependent Claim
22 words
A sintered member according to claim 1, wherein at least one of said sintering assistant ingredients group consists of Mo 2 C.
Claim 19
Dependent Claim
35 words
A sintered member according to claim 1, wherein at least one of said sintering assistant ingredients is selected from the group consisting of oxides of lanthanide series elements of atomic numbers through 57 through 71.
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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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |