Ceramic phase in sintered silicon nitride containing cerium, aluminum, and iron
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-035/56
C04B-035/58
출원번호
US-0557543
(1990-07-24)
발명자
/ 주소
Edler James P. (Troy MI) Lisowsky Bohdan (Troy MI)
출원인 / 주소
Eaton Corporation (Cleveland OH 02)
인용정보
피인용 횟수 :
5인용 특허 :
20
초록▼
A body of sintered silicon nitride contains new non-glassy phases which produce significant X-ray diffraction peaks at 2-theta diffraction angles corresponding to d-spacings of about 2.86 Angstroms and 3.59 Angstroms and process for making same, which process includes (a) comminuting a slurry of a s
A body of sintered silicon nitride contains new non-glassy phases which produce significant X-ray diffraction peaks at 2-theta diffraction angles corresponding to d-spacings of about 2.86 Angstroms and 3.59 Angstroms and process for making same, which process includes (a) comminuting a slurry of a silicon-containing powder, water, about 0.1 to 5 volume percent of Fe2O3, about 0.1 to 5 volume percent Al2O3, and about 0.5 to 10 volume percent CeO2, wherein all volume percents are based on the volume of the resultant silicon nitride, the composition of the slurry being such that about a 4 to 12 volume percent liquid phase is achieved during sintering; (b) reducing the water content of the reacted slurry to form a dry mass; (c) nitriding the dry mass by exposure to a nitriding gas at an elevated temperature to form silicon nitride; and (d) sintering the silicon nitride at about 1450°-2100°C.
대표청구항▼
A body of sintered silicon nitride, comprising a non-glassy phase which produces significant X-ray diffraction peaks at 2-theta diffraction angles corresponding to d-spacings of about 2.86 Angstroms and 3.59 Angstroms, said body prepared by the method including: (a) comminuting a slurry comprising a
A body of sintered silicon nitride, comprising a non-glassy phase which produces significant X-ray diffraction peaks at 2-theta diffraction angles corresponding to d-spacings of about 2.86 Angstroms and 3.59 Angstroms, said body prepared by the method including: (a) comminuting a slurry comprising a mixture of (i) a silicon-containing powder selected from the group consisting of commercial grade silicon, substantially pure silicon powder, alpha phase silicon nitride and mixtures thereof, (ii) water, (iii) about 0.5 to 5 volume percent of a nitriding agent, Fe2O3, based on the volume of the resultant silicon nitride, (iv) about 0.1 to 5 volume percent, of a densification aid, Al2O3, based on the volume of the resultant silicon nitride, and (v) about 0.5 to 10 volume percent of a densification aid, CeO2, based on the volume of the resultant silicon nitride, the Fe2O3, Al2O3, and the CeO2 being employed in amounts to achieve about a total 4 to 12 volume percent of both nitriding agent and densification aids base don the volume of the resultant silicon nitride, the slurry components being employed in amounts such that the slurry contains about 10 to 60 volume percent solids and about 90 to 40 volume percent water, the comminuting being performed to form fresh, non-oxidized surfaces on the silicon powder and to allow substantial chemical reaction between the silicon and the water; (b) reducing the water content of the reacted slurry to a degree sufficient to form a dry mass; (c) nitriding the dry mass by exposure to a sufficient amount of a nitriding gas including at least nitrogen at a sufficient temperature for a sufficient length of time to form a mass of substantially silicon nitride, and (d) sintering the silicon nitride mass at about 1450°C. to 2100°C. for a sufficient length of time to convert the silicon nitride from a predominantly alpha-phase material to a predominantly beta-phase silicon nitride material.
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이 특허에 인용된 특허 (20)
Jacobson Howard Wayne (Wilmington DE), Amorphous silicon nitride composition containing carbon, and vapor phase process.
Dickie Ray A. (Birmingham MI) Mangels John A. (Flat Rock MI), Method of forming a relatively stable slip of silicon metal particles and yttrium containing particles.
Minjolle Louis (Tarbes FRX) Chateigner Serge (Rabastens de Bigorre FRX), Method of manufacturing a sintered material based on silicon nitride, and material obtained by the method.
Martinengo Pier C. (Turin ITX) Giachello Angelo (Turin ITX) Tommasini Giuseppe (Turin ITX) Popper Paul (Newcastle GB2), Process for sintering silicon nitride compacts.
Lindenau Rene,DEX ; Dollmeier Klaus,DEX ; Kynast Wieland,DEX ; Wahnschaffe Jens,DEX, Compacting auxiliary agent for producing sinterable shaped parts from a metal powder.
Mehrotra, Pankaj K.; Garman, Mark A.; Lipniskis, Chuck E.; Battaglia, Frank B., Process for heat treating ceramics and articles of manufacture made thereby.
Martin Jansen DE; Eberhard Gunther DE; Hans-Peter Letschert DE, Process for the production of yellow to red pigments based on nitrides and oxidenitrides.
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