Silicon nitride powder for sintering
AssigneeTokuyama Corporation
InventorsHideaki Kawai, Satoru Wakamatsu
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Abstract
A silicon nitride powder for sintering which, despite of its fine powdery form, shows a very small increase in the oxygen concentration with time and features excellent storage stability. The silicon nitride powder for sintering has a specific surface area of 5 to 30 m2/g, and is characterized by having a hydrophobicity (M value) of 30 or more and an increase in the oxygen concentration of 0.30% by mass or less after left to stand in the air of a humidity of 90% and 20° C. for 48 hours. The silicon nitride powder for sintering can be obtained by dry-pulverizing aggregated masses of the silicon nitride in an inert atmosphere in the presence of a silane coupling agent.
Claims4
A silicon nitride powder for sintering having a specific surface area of 5 to 30 m2/g, and by having a hydrophobicity (M value) of 30 or more and an increase in the oxygen concentration of 0.30% by mass or less after left to stand in the air of a humidity of 90% and 20° C. for 48 hours.
A silicon nitride powder for sintering having a specific surface area of 5 to 30 m2/g, and having a hydrophobicity (M value) of 30 or more and an increase in the oxygen concentration of 0.30% by mass or less after left to stand in the air of a humidity of 90% and 20° C. for 48 hours,
- wherein a β conversion ratio is 80% or more and an aluminum concentration is 0.1% by mass or less.
A silicon nitride powder for sintering having a specific surface area of 5 to 30 m2/g, and having a hydrophobicity (M value) of 30 or more and an increase in the oxygen concentration of 0.30% by mass or less after left to stand in the air of a humidity of 90% and 20° C. for 48 hours,
- wherein the oxygen concentration (Co % by mass) after left to stand in the air of a humidity of 90% and 20° C. for 48 hours lies in a range represented by the following formula (1),
- Co≤0.1×S−0.3 (1)
- for said specific surface area (Sm2/g),
- wherein a β conversion ratio is 80% or more and an aluminum concentration is 0.1% by mass or less.
Dependencies are inferred from the claim text.