Boride-based refractory materials
Abstract
Abstract A novel high strength, high heat resistance sintered body suitable for use as refractory and abrasive materials is proposed. The sintered body comprises from 99.99 to 70% by weight of a combination of at least two kinds of metal diborides selected from the group consisting of diborides of Ti, Ta, Cr, Mn, Mo, Y, V, Hf, Nb, Al and Zr and from 0.01 to 30% by weight of a metal boride or borides selected from the group consisting of borides of nickel, iron and cobalt. The sintered body of the invention can be prepared by sintering the powdery mixture of the components at a relatively low temperature of 1800 DEG C. or lower and has a bending strength as high as 190 kg/mm2 and a Vickers hardness of 3300 kg/mm2 at room temperature and 2400 kg/mm2 at 1000 DEG C.
Inventors
- 👤 Tadahiko Watanabe
- 👤 Hiroki Shimizu
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |