Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1996-12-23
1999-02-02
Turner, Archene
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
156 89, 264603, 264628, 264638, 264639, 264650, 264683, 26417311, 427243, 4273977, 4274197, 428212, 428216, 4283122, 4283126, 4283166, 4283184, 4283186, 428698, 428697, 428699, 428701, B32B 1800, C04B 3558
Patent
active
058662456
ABSTRACT:
The present invention relates to a silicon nitride sintered body having a remarkably increased strain-to-fracture, a low elasticity and high strength, characterized by consisting of a layered structure of alternating porous silicon nitride layers 1 to 1000 .mu.m thick with a porosity of 5 to 70 volume % and dense silicon nitride layers 1 to 1000 .mu.m thick with a porosity of less than 5 volume %, being layered as materials with optional tiers. In addition, this invention relates to a method for producing the silicon nitride sintered body as described above, which comprises of forming dense layers and porous layers by sheet casting or extrusion forming so as to prepare the layers to be capable of 1 to 1000 .mu.m thick after sintering, stacking them to obtain layered materials with optional tiers and sintering them at 1600.degree. to 2100 .degree. C. under a nitrogen atmosphere.
REFERENCES:
patent: 4956137 (1990-09-01), Dwivedi
patent: 4993481 (1991-02-01), Kamimoto et al.
Journal of the Ceramic Society of Japan, vol. 97, No. 8, pp. 872-874, 1989, Yoshio Ukyo, et al., "High Strength Si.sub.3 N.sub.4 Cermanics".
Journal of the Ceramic Society of Japan, vol. 103, No. 4, pp. 407-408, 1995, Masashi Yoshimura, et al., "Grain Size Controlled High-Strength Silicon Nitride Ceramics".
Journal of American Ceramics Society, vol. 73, No. 9, pp. 2684-2689, 1990 Lauge Nielsen, "Strength and Stiffness of Porous Materials".
Brito Manuel E.
Hirao Kiyoshi
Kanzaki Syuzo
Shigegaki Yasuhiro
Toriyama Motohiro
Fine Ceramics Research Association
Japan as represented by Director General of Agency of Industrial
Turner Archene
LandOfFree
Silicon nitride ceramics having a high reliability and a method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Silicon nitride ceramics having a high reliability and a method , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Silicon nitride ceramics having a high reliability and a method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1115344