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DENSE SILICON NITRIDE BODY HAVING HIGH STRENGTH, HIGH WEIBULL MODULUS AND HIGH FRACTURE TOUGHNESS
Silicon nitride materials with high strength, fracture toughness values, and Weibull moduli simultaneously, due to unique large grain reinforcing microstructures and well engineered grain boundary compositions. The invention demonstrates that, surprisingly and contrary to prior art, a silicon nitride material can be made which simultaneously has high strength above about 850-900 MPa, a Weibull above about 15 and high fracture toughness (above about 8 and 9 MPa·m1/2), and has reinforcing grains longer than 5 mum, typically longer than 10 mum in the microstructure without compromising its properties and reliability. The product of this invention can be processed using a variety of densification methods, including gas-pressure sintering, hot pressing, hot isostatic pressing, but is not limited to these, and does not require multiple heat treatments for all of these features to be achieved.
DENSE SILICON NITRIDE BODY HAVING HIGH STRENGTH, HIGH WEIBULL MODULUS AND HIGH FRACTURE TOUGHNESS
Silicon nitride materials with high strength, fracture toughness values, and Weibull moduli simultaneously, due to unique large grain reinforcing microstructures and well engineered grain boundary compositions. The invention demonstrates that, surprisingly and contrary to prior art, a silicon nitride material can be made which simultaneously has high strength above about 850-900 MPa, a Weibull above about 15 and high fracture toughness (above about 8 and 9 MPa·m1/2), and has reinforcing grains longer than 5 mum, typically longer than 10 mum in the microstructure without compromising its properties and reliability. The product of this invention can be processed using a variety of densification methods, including gas-pressure sintering, hot pressing, hot isostatic pressing, but is not limited to these, and does not require multiple heat treatments for all of these features to be achieved.
DENSE SILICON NITRIDE BODY HAVING HIGH STRENGTH, HIGH WEIBULL MODULUS AND HIGH FRACTURE TOUGHNESS
DICHTER SILICIUM-NITRID-KÖRPER VON HOHER STÄRKE, HOHEM WEIBULL-MODULUS UND HOHER BRUCHFESTIGKEIT
CORPS EN NITRURE DE SILICIUM DENSE À HAUTE RESISTANCE, À MODULE DE WEIBULL ÉLEVÉ ET À GRANDE TÉNACITÉ À LA RUPTURE
MIKIJELJ BILJANA (Autor:in)
27.12.2017
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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