WO1987003867A1 - High-strength ceramics containing alpha-sialon - Google Patents
High-strength ceramics containing alpha-sialon Download PDFInfo
- Publication number
- WO1987003867A1 WO1987003867A1 PCT/JP1985/000700 JP8500700W WO8703867A1 WO 1987003867 A1 WO1987003867 A1 WO 1987003867A1 JP 8500700 W JP8500700 W JP 8500700W WO 8703867 A1 WO8703867 A1 WO 8703867A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sialon
- weight
- composition
- range
- ceramics
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/597—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon oxynitride, e.g. SIALONS
Definitions
- the present invention relates to a novel -Sialon-containing ceramic based on 0-Sialon, and more particularly, to a mechanical structure in the engineering field which is superior in physical properties such as strength, toughness, and hardness and has good electric conductivity. Useful as a part route-Sialon-containing ceramics.
- Sialon 5 i position Wf AI nitride Kei element (4) has the structure ⁇ is 0 to the position are replaced - AI - 0 - N) generically der substances having a basic, - sialon and 0 - sialon It has been known.
- - Saia Ron / -? Hot L to S position of S i 5 N crystal structure der ones 0 to position a solid solution Replace 9, for example, a mixture of S i 3 N, 0 3 and V It is produced by pressing or by heating a molded body of the mixture in a nitrogen atmosphere at 1 atm.
- ⁇ -Sialon ceramics is a substance discovered through such a research process, and currently has the general formula (S i, ⁇ ⁇ ) 12 (0, ⁇ ) 16 (where ⁇ is L,, C ⁇ , F or ⁇ ⁇ represents a lanthanide metal element other than Ce, and is expressed as 0 ⁇ x ⁇ 2), and two methods for its production have been proposed: normal pressure sintering and pressure sintering [ the aforementioned Japanese Patent Publication 5 8 - 2 3 3 4 6 JP and Sho 5 8 - 3 5 9 5 0 see JP].
- the obtained 0-cylon ceramics alone cannot be said to have sufficiently high mechanical properties depending on the application, and can be easily manufactured at normal pressure and can be easily applied to complicated molded products. In general, about 3 to 5% of pores remain in the resulting sintered body], and it is difficult to obtain a high-strength sintered body.
- the present inventors have conducted intensive studies to improve the properties of Bi-Sialon ceramics. As a result, the present inventors have found that this time, the integration of Bi-Sialon with oxides, carbides or borides of certain metals
- the sintered body (ceramics) is The present inventors have found that they have properties such as high fracture toughness, hardness, and electrical conductivity that can meet the requirements as mechanical and structural parts in the field of sealing, and have completed the present invention.
- the content of the Sialon crystal phase is 10 to 95 times
- the ⁇ -sialon constituting the ceramics of the present invention is F-ct-sialon, which has excellent mechanical strength especially among a-sialon, using yttrium (r) as an interstitial solid solution element.
- the force be less than 0.8, especially in the range of 0.1 to 0.6.
- the -sialon composition consists essentially of mono-a-sialon single phase crystals.
- the r- ⁇ -sialon composition forms ⁇ -sialon ⁇ ⁇ It consists essentially of a composite structure of a crystalline phase and a columnar crystalline phase of silicon nitride.
- the content of ⁇ -silicon nitride is in the range of 0 to 89 weights based on the weight of the different forces-sialon composition depending on the mixing ratio of the raw materials and the sintering conditions.
- ⁇ -sialon composition used in the present specification and claims includes not only a single-phase crystal of ⁇ -sialon, but also a crystal phase of ⁇ -sialon crystal phase. ?-It should be understood that the term is used to include the complex structure with the silicon nitride crystal phase.
- the above-mentioned F--sialon does not form a solid solution in the crystal grain boundaries and may remain as a glass phase.j Therefore,-and -sialon are usually added in addition to the crystal phase as described above. May contain up to 5 weight (based on the weight of Y--sialon) glass phase.
- the ceramic of the present invention has the above-described ⁇ - ⁇ : -sialon crystal phase in an amount of 10 to 95% by weight based on the weight of the ceramic.
- the preferred content range depends on the type of the oxide, nitride, carbide or boride of a metal which cannot be dissolved with Sialon, which will be described later.
- the ceramics of the present invention e.g., metals, nitrides, carbides, and borides that can form a solid solution with X-sialon (hereinafter sometimes referred to as “non-solid solution components.”) are substantially: 0; -Sin is a component that does not form an interstitial solid solution in the crystal lattice and forms a sintered body simply mixed with 0L-Sialon.
- the suitable as oxides, S i O z include C e 0 2, Z r O z, also, as the nitrides and carbides, T i iY, B 4 C , S i C , T i C, C, and boride
- -Sialon-containing ceramic of the invention is a homogeneous sintered body with the above-mentioned (-Sialon non-solid solution component), for example, and -SiAlON production materials such as silicon nitride, aluminum nitride and yttrium oxide. Thorium or yttrium oxide is converted to yttrium oxide under the sintering conditions.
- the above-mentioned non-solid-soluble component is mixed with the above-mentioned insoluble component, pulverized, molded, and sintered under normal pressure or sintered under an inert gas atmosphere. It can be manufactured by subjecting to two-stage sintering of sintering or normal pressure sintering-pressure sintering.
- examples of the yttrium-containing compound that can be used as one of the raw materials include inorganic or organic salts of yttrium, such as carbonates, basic carbonates, hydroxides, and oxalates, or alkoxides.
- No. ⁇ Compounds containing arsenic, aluminum nitride and sodium or yttrium oxide have a desired composition formula: [ ⁇ ( Si , Al) l2 (0, ⁇ ) ⁇ 3 0;-can be mixed in a theoretical ratio that produces sialon, and can be mixed with a non-solid solution component in a ratio corresponding to the content.
- typical examples of the mixing ratio of each component are as follows.
- the raw material mixture mixed in the above ratio is uniformly mixed and pulverized using, for example, a vibration mill, an attritor, a ball mill, or the like, and then formed into a predetermined shape.
- the molding can be carried out by, for example, mold molding, cross molding, isostatic press molding, injection molding and the like.
- the molded body thus formed is sintered in the following manner.
- normal pressure sintering see Japanese Patent Publication No. 58-233346
- sintering method see Japanese Patent Publication No. 58-35950
- normal pressure sintering —It can be performed by two-stage sintering method of pressure sintering.
- the non-solid solution component is an oxide
- the sintering method or the two-step sintering method is advantageously used.
- the non-solid solution component is a nitride, a carbide or a boride
- the compact is made of a powder containing silicon nitride, for example, a powder of silicon nitride alone, or a mixed powder of silicon nitride and aluminum nitride.
- the sintering temperature is generally 160 ° to 200 °° (preferably in the range of 160 ° to 180 °° ⁇ ), and the sintering time is usually 30 minutes to 10 hours, Preferably, it is 1 to 5 hours.
- the pressure sintering is performed in an inert gas atmosphere by a gas pressure sintering method, a hot isostatic pressing method, a hot pressing method, or the like. Generally 30 /
- the sintering temperature is generally from 160 to 200, preferably from 160 to 180 ° C, and the sintering time is usually from 30 minutes to 5 hours, preferably from 1-3 hours.
- the two-stage sintering is performed by the normal pressure sintering method as described above.] After forming a pre-sintered body, pressure sintering can be performed as described above.
- the above manufacturing process generates Serra contamination ⁇ 2 0 3 into the mix as possible prevent the mixing of raw materials, pulverizing and molding, processes such as drying is conducted under a non-oxidizing atmosphere in organic solvent preferably carried out in, it is desirable to further avoid the use of containers Ya Kona ⁇ mixed medium also contains a ⁇ I ⁇ 2 0 3 canceler mix used.
- Nitride Kei element particle size less than 1, the following cationic impurities 0.5%), nitride ⁇ Lumi Niumu (particle size less than 1, the cation impurities 0.5% or less), F 2 0 3
- the obtained mixture is molded with a cold isostatic press at a pressure of 2 ° ZCT !, and processed into a 60 X 60 X 10 thigh compact, and then the compact is placed in a normal pressure sintering furnace. Under nitrogen atmosphere at 1750 ° C for 2 hours.
- Example 2 Using the component mixture having the formulation shown in Table 2 below, the pre-sintered body obtained in the same manner as in Example 1 was subjected to a heat treatment at 180 ° C. for 2 hours under a nitrogen gas pressure atmosphere of 100 ° C. .
- the obtained sintered body was measured for the three-point bending strength and the content of 0; -sialon crystal phase and? -Silicon nitride crystal phase in the same manner as in Example 1. The results are shown in Table 2 below.
- the preform is heated at 180 ° C. for 1 hour at a pressure of 500 ° C. Then, sintering was performed to obtain a sintered body.
- the density of each of the obtained sintered bodies was 98 or more of the theoretical density.
- a surface polished specimen was prepared for this sintered body, and the hardness was evaluated using a Vickers hardness tester. Table 4 shows the results.
- Example 1 The same nitriding Kei element as used in Example 1 was mixed with high purity beta 2 or Z r B 2, which is commercially available aluminum nitride and 2 0 3 in a proportion shown in Table 5 below, as in Example 1 There line 3 ⁇ 4 mixed and ground by a to obtain a preform at 5 0 0 with dry after cold HazamaShizu isostatic pressing.
- the preform was subjected to 180 under a nitrogen gas atmosphere. 1 hour at C, 300 Sintering was performed by hot pressing. The results of measuring the electrical conductivity of the obtained sintered body are shown in Table 5 below.
- the -sialon-containing ceramics provided by the present invention have excellent properties such as bending strength, crushing toughness, hardness and electrical conductivity, and are suitable for various applications in the engineering field. It can be used as mechanical structural parts, electrode materials, etc.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP86900260A EP0250593B1 (en) | 1985-12-20 | 1985-12-20 | High-strength ceramics containing alpha-sialon |
AT86900260T ATE67474T1 (de) | 1985-12-20 | 1985-12-20 | Hochfeste keramikgegenstaende enthaltend alphasialon. |
PCT/JP1985/000700 WO1987003867A1 (en) | 1985-12-20 | 1985-12-20 | High-strength ceramics containing alpha-sialon |
DE8686900260T DE3584170D1 (de) | 1985-12-20 | 1985-12-20 | Hochfeste keramikgegenstaende enthaltend alpha-sialon. |
FI873586A FI89705C (fi) | 1985-12-20 | 1987-08-19 | Hoeghaollfasta -sialonhaltiga keramer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1985/000700 WO1987003867A1 (en) | 1985-12-20 | 1985-12-20 | High-strength ceramics containing alpha-sialon |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1987003867A1 true WO1987003867A1 (en) | 1987-07-02 |
Family
ID=13846670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1985/000700 WO1987003867A1 (en) | 1985-12-20 | 1985-12-20 | High-strength ceramics containing alpha-sialon |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0250593B1 (ja) |
AT (1) | ATE67474T1 (ja) |
DE (1) | DE3584170D1 (ja) |
FI (1) | FI89705C (ja) |
WO (1) | WO1987003867A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2556888B2 (ja) * | 1987-12-24 | 1996-11-27 | 日立金属株式会社 | 電気抵抗率バラツキの少ないセラミックス導電材料 |
GB8808356D0 (en) * | 1988-04-09 | 1988-05-11 | Lucas Cookson Syalon Ltd | Substituted silicon nitride material & method of production thereof |
KR970009988B1 (ko) * | 1991-09-04 | 1997-06-20 | 시나가와시로렌가 가부시끼가이샤 | 고 내식성 α-사이알론질 소결체 및 그의 제조방법 |
US8367576B2 (en) | 2010-11-18 | 2013-02-05 | Kennametal Inc. | Charge-dispersing alpha prime-beta prime SiA1ON |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58213679A (ja) * | 1982-05-20 | 1983-12-12 | ジ−・テイ−・イ−・ラボラトリ−ズ・インコ−ポレ−テツド | 複合セラミツク切削工具及びその製造方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59182276A (ja) * | 1983-03-31 | 1984-10-17 | 株式会社東芝 | 窒化ケイ素焼結体 |
JPS6027643A (ja) * | 1983-07-27 | 1985-02-12 | 株式会社日立製作所 | 高温構造部材 |
-
1985
- 1985-12-20 WO PCT/JP1985/000700 patent/WO1987003867A1/ja not_active Application Discontinuation
- 1985-12-20 DE DE8686900260T patent/DE3584170D1/de not_active Revoked
- 1985-12-20 AT AT86900260T patent/ATE67474T1/de active
- 1985-12-20 EP EP86900260A patent/EP0250593B1/en not_active Expired - Lifetime
-
1987
- 1987-08-19 FI FI873586A patent/FI89705C/fi not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58213679A (ja) * | 1982-05-20 | 1983-12-12 | ジ−・テイ−・イ−・ラボラトリ−ズ・インコ−ポレ−テツド | 複合セラミツク切削工具及びその製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0250593A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0250593A1 (en) | 1988-01-07 |
EP0250593B1 (en) | 1991-09-18 |
EP0250593A4 (en) | 1989-10-24 |
FI873586A0 (fi) | 1987-08-19 |
FI873586A (fi) | 1987-08-19 |
ATE67474T1 (de) | 1991-10-15 |
FI89705B (fi) | 1993-07-30 |
DE3584170D1 (de) | 1991-10-24 |
FI89705C (fi) | 1993-11-10 |
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