EP0071997A1
Expired / Lapsed
EP
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Sintered body of ceramics and preparation thereof
Assignee: Toshiba Corp
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Filing: 1982-08-06
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Granted: —
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Expires: 2002-08-06
Abstract
Abstract There are disclosed a sintered body of ceramics, comprising 0.1 to 10% by weight of Y 2 O 3 ; 0.1 to 10% by weight of Aℓ 2 O 3 ; 0.1 to 10% by weight of AℓN; 0.1 to 5% by weight of at least one oxide selected from the group consisting of Li,O. BeO, CaO, V 2 O 5 , MnO 2 , MoO 3 and WO 3 or a combination of at least one of these oxides with at least one oxide selected from the group consisting of B 2 O 3 , MgO, TiO 2 , Cr 2 O 3 , CoO. NiO, ZrO 2 , Nb 2 O 5 , HfO 2 and Ta 2 O 5 ; and the balance of Si 2 N 4 , and a process for producing a sintered body of ceramics, which comprised molding a powder mixture of the same composition, and sintering the resultant molded compact in a non-oxidative atmosphere. The process of the present invention requires no hot press and therefore is very suitable for bulk production.
Inventors
- 👤 Michiyasu Komatsu
- 👤 Akihiko Tsuge
- 👤 Hiroyasu Ota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:19
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/597; C04B35/584; C04B35/593; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3203; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3217; C04B2235/3224; C04B2235/3225; C04B2235/3231; C04B2235/3232; C04B2235/3239; C04B2235/3241; C04B2235/3244; C04B2235/3251; C04B2235/3256; C04B2235/3258; C04B2235/3262; C04B2235/3267; C04B2235/327; C04B2235/3275; C04B2235/3279; C04B2235/34; C04B2235/3409; C04B2235/38; C04B2235/3852; C04B2235/386; C04B2235/3873; C04B2235/3878; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5445; C04B2235/65; C04B2235/658; C04B2235/6586; C04B2235/66; C04B2235/661; C04B2235/668; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
A sintered body of ceramics, comprising 0.1 to 10% by weight of yttrium oxide (Y 2 0 3 ); 0.1 to 10% by weight of aluminum oxide (Aℓ 2 O 3 ); 0.1 to 10% by weight of aluminum nitride (AℓN); 0.1 to 5% by weight of at least one oxide selected from the group consisting of lithium oxide (Li 2 0), beryllium oxide (BeO), calcium oxide (CaO), vanadium oxide (V 2 O 5 ), manganese oxide (MnO 2 ), molybdenum oxide (Mo03) and tungsten oxide (W0 3 ) or a combination of at least one of these oxides with at least one oxide selected from the group consisting of boron oxide (B 2 O 3 ), magnesium oxide (MgO), titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), cobalt oxide (CoO), nickel oxide (NiO), zirconium oxide (ZrO 2 ), niobium oxide (Nb 2 O 5 ), hafnium oxide (Hf0 2 ) and tantalum oxide (Ta 2 0 5 ); and the balance being silicon nitride (Si3N4).
Claim 2
Dependent Claim
170 words
A sintered body of ceramics, comprising 0.1 to 10% by weight of yttrium oxide (Y 2 0 3 ); 0.1 to 10% by weight of aluminum oxide (Aℓ 2 O 3 ); 0.1 to 10% by weight of aluminum nitride (AℓN); 0.1 to 5% by weight of at least one oxide selected from the group consisting of lithium oxide (Li 2 0), beryllium oxide (BeO), calcium oxide (CaO), vanadium oxide (V 2 O 5 ), manganese oxide (MnO 2 ), molybdenum oxide (Mo03) and tungsten oxide (W0 3 ) or a combination of at least one of these oxides with at least one oxide selected from the group consisting of boron oxide (B 2 O 3 ), magnesium oxide (MgO), titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), cobalt oxide (CoO), nickel oxide (NiO), zirconium oxide (ZrO 2 ), niobium oxide (Nb 2 O 5 ), hafnium oxide (Hf0 2 ) and tantalum oxide (Ta 2 0 5 ); and the balance being silicon nitride (Si3N4).
Claim 3
Dependent Claim
117 words
A sintered body of ceramics according to Claim 1, wherein said sintered body comprises 0.5 to 8% by weight of yttrium oxide; 0.5 to 8% by weight of aluminum oxide; 0.5 to 8% by weight of aluminum nitride; 0.25 to 3% by weight of at least one oxide selected from the group consisting of lithium oxide, beryllium oxide, calcium oxide, vanadium oxide, manganese oxide, molybdenum oxide and tungsten oxide or a combination of at least one of these oxides with at least one oxide selected from the group consisting of boron oxide, magnesium oxide, titanium oxide, chromium oxide, cobalt oxide, nickel oxide, zirconium oxide, niobium oxide, hafnium oxide and tantalum oxide; and the balance being silicon nitride.
Claim 4
Dependent Claim
202 words
A process for producing a sintered body of ceramics, which comprises molding a powder mixture comprising 0.1 to 10% by weight of yttrium oxide (Y 2 0 3 ) powders; 0.1 to 10% by weight of aluminum oxide (Aℓ 2 O 3 ) powders; 0.1 to 10% by weight of aluminum nitride (AℓN) powders; 0.1 to 5% by weight of at least one powdery oxide selected from the group consisting of lithium oxide (Li 2 0), beryllium oxide (BeO), calcium oxide (CaO 2 ), vanadium oxide (V 2 0 5 ), manganese oxide (MnO 2 ), molybdenum oxide (Mo03) and tungsten oxide (W0 3 ) or a combination of at least one of these powdery oxides with at least one powdery oxide selected from the group consisting of boron oxide (B 2 O 3 ), magnesium oxide (MgO), titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), cobalt oxide (CoO), nickel oxide (NiO), zirconium oxide (ZrO 2 ), niobium oxide (Nb 2 O 5 ), hafnium oxide (Hf0 2 ) and tantalum oxide (Ta 2 O 5 ); and the balance of silicone nitride (Si 3 N 4 ) powders, and sintering the resultant compact in a non-oxidative atmosphere.
Claim 5
Dependent Claim
202 words
A process for producing a sintered body of ceramics, which comprises molding a powder mixture comprising 0.1 to 10% by weight of yttrium oxide (Y 2 0 3 ) powders; 0.1 to 10% by weight of aluminum oxide (Aℓ 2 O 3 ) powders; 0.1 to 10% by weight of aluminum nitride (AℓN) powders; 0.1 to 5% by weight of at least one powdery oxide selected from the group consisting of lithium oxide (Li 2 0), beryllium oxide (BeO), calcium oxide (CaO 2 ), vanadium oxide (V 2 0 5 ), manganese oxide (MnO 2 ), molybdenum oxide (Mo03) and tungsten oxide (W0 3 ) or a combination of at least one of these powdery oxides with at least one powdery oxide selected from the group consisting of boron oxide (B 2 O 3 ), magnesium oxide (MgO), titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), cobalt oxide (CoO), nickel oxide (NiO), zirconium oxide (ZrO 2 ), niobium oxide (Nb 2 O 5 ), hafnium oxide (Hf0 2 ) and tantalum oxide (Ta 2 O 5 ); and the balance of silicone nitride (Si 3 N 4 ) powders, and sintering the resultant compact in a non-oxidative atmosphere.
Claim 6
Dependent Claim
141 words
A process for producing a sintered body of ceramics according to Claim 3, wherein said process comprises molding a powder mixture comprising 0.5 to 8% by weight of yttrium oxide powders; 0.5 to 8% by weight of aluminum oxide powders; 0.5 to 8% by weight of aluminum nitride powders; 0.25 to 3% by weight of at least one powdery oxide selected from the group consisting of lithium oxide, beryllium oxide, calcium oxide, vanadium oxide, manganese oxide, molybdenum oxide and tungsten oxide or a combination of at least one of these powdery oxides with at least one powdery oxide selected form the group consisting of boron oxide, magnesium oxide, titanium oxide, chromium oxide, cobalt oxide, nickel oxide, zirconium oxide, niobium oxide, hafnium oxide and tantalum oxide; and the balance of silicon nitride powders, and sintering the resultant compact in a non-oxidative atmosphere.
References Cited (Backward Citations)
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