IT1174786B - High strength hot pressed silicon nitride prepn. - Google Patents
High strength hot pressed silicon nitride prepn.Info
- Publication number
- IT1174786B IT1174786B IT49076/83A IT4907683A IT1174786B IT 1174786 B IT1174786 B IT 1174786B IT 49076/83 A IT49076/83 A IT 49076/83A IT 4907683 A IT4907683 A IT 4907683A IT 1174786 B IT1174786 B IT 1174786B
- Authority
- IT
- Italy
- Prior art keywords
- si3n4
- mixt
- atmos
- ksi
- pref
- Prior art date
Links
- 229910052581 Si3N4 Inorganic materials 0.000 title abstract 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title 1
- 239000002245 particle Substances 0.000 abstract 3
- 238000007731 hot pressing Methods 0.000 abstract 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
- 238000009837 dry grinding Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 238000010902 jet-milling Methods 0.000 abstract 1
- 238000005121 nitriding Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
Landscapes
- Ceramic Products (AREA)
Abstract
Hot pressed Si3N4 is prepd. by (a) forming a powder mixt. of Si and reactive O-carrying agents including dry or jet milling to an absolute particle size distribution having no particle larger than 16 microns; (b) compacting to form a preform density 1.1-1.4 g/cm3; (c) heating in a nitriding atmos. without press. to fully react ingredients with the atmos., forming an Si3N4 body; and (d) hot pressing to produce an Si3N4 object of desired dimensions and density, useful as a cutting tool. The mixt. pref. has a max. particle size 3-4.5 microns. The mixt. may also contain 2-25% Si3N4 composite (of the same compsn. of the final object) to increase packing efficiency. The resulting object pref. has a modulus of rupture 150-190 ksi and a hardness (45-N) at least 92. Flaws causing strength redn. are reduced, providing a strength much higher than the conventional 100 ksi. and a hardness above conventional 90-92. Inclusion of Si3N4 decreases the hot pressing compression ratio needed to form a dense body. The prod. is useful as a cutting tool.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44424882A | 1982-09-30 | 1982-09-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IT8349076A0 IT8349076A0 (en) | 1983-09-29 |
| IT1174786B true IT1174786B (en) | 1987-07-01 |
Family
ID=23764095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT49076/83A IT1174786B (en) | 1982-09-30 | 1983-09-29 | High strength hot pressed silicon nitride prepn. |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1227623A (en) |
| IT (1) | IT1174786B (en) |
| ZA (1) | ZA836302B (en) |
-
1983
- 1983-08-04 CA CA000433863A patent/CA1227623A/en not_active Expired
- 1983-08-25 ZA ZA836302A patent/ZA836302B/en unknown
- 1983-09-29 IT IT49076/83A patent/IT1174786B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| CA1227623A (en) | 1987-10-06 |
| ZA836302B (en) | 1984-04-25 |
| IT8349076A0 (en) | 1983-09-29 |
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