WO1987001369A1 - High-density alumina-zirconia sinter and process fro its production - Google Patents
High-density alumina-zirconia sinter and process fro its production Download PDFInfo
- Publication number
- WO1987001369A1 WO1987001369A1 PCT/JP1986/000449 JP8600449W WO8701369A1 WO 1987001369 A1 WO1987001369 A1 WO 1987001369A1 JP 8600449 W JP8600449 W JP 8600449W WO 8701369 A1 WO8701369 A1 WO 8701369A1
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- WO
- WIPO (PCT)
- Prior art keywords
- powder
- alumina
- zirconia
- mol
- transition metal
- 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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/111—Fine ceramics
- C04B35/117—Composites
- C04B35/119—Composites with zirconium oxide
Definitions
- the present invention A 1 2 0 3 and Zr0 2 and a high density alumina Gil Koyua sintered body mainly composed of and a method for producing the same.
- the high-density alumina-zirconia sintered body of the present invention has high hardness, excellent wear resistance, and high toughness, and is expected to be applied as a structural material such as a machine member, a wear-resistant material, and a cutting tool.
- Alumina which is famous as one of the ceramics for cutting tools, has excellent wear resistance, but has the disadvantages of pitting and glazing. Improvement of toughness was the main goal of development.
- a method of improving the toughness of alumina a method of finely dispersing zirconia in an alumina structure is known.
- a mechanism for improving the toughness finely dispersed tetragonal zirconia particles are used to propagate the particles.
- a mechanism has been proposed that transforms to monoclinic in the stress field at the crack tip and absorbs the energy of crack propagation.
- the zirconia does not contain a stabilizing agent, in order for the zirconia particles to be stably present as tetragonal crystals in the alumina matrix, the particle size must be equal to the critical particle size (0.5 ⁇ 1) It must be less than.
- sintering under high pressure HIP treatment
- sintering under high pressure is not industrially preferable, and sintering under normal pressure and high temperature may result in alumina grain growth and zirconia grain growth, and the resulting monoclinic formation. Crystal transformation tends to occur, and the reinforcing effect of zirconia tends to decrease.
- the present invention suppresses the grain growth of alumina and zirconia particles by improving the sinterability of the alumina-zirconia composite powder, and provides a high hardness aluminum alloy having a high fracture toughness value and excellent wear resistance. It is intended to provide a zirconia sintered body. It is another object of the present invention to provide a method for producing the alumina-zirconia sintered body by atmospheric pressure sintering in a relatively low temperature range.
- the present invention is a.
- c-Aluminum More than 60 mol% and less than 99 mol%
- Transition metal oxide As the atomic ratio to the sum of A1 and Zr of the transition metal
- zirconia content is less than 1 mol%, high toughness cannot be obtained, and if it exceeds 40 mol%, the hardness tends to decrease.
- the high-density alumina-zirconia sintered body of the present invention can be manufactured, for example, by the following method.
- Precursor powder for producing the zirconia powder by heating or zirconia powder, and ⁇ -alumina powder having a crystallite diameter of 1.0 or less and a BET specific surface area of 5ra 2 / g or more, or a precursor powder for producing the ⁇ -alumina powder Is mixed with a solution or suspension of at least one transition metal compound containing 8, (0,, (: 11 or 211 as the metal species), and then removing the solvent and drying.
- the sintered body of the present invention can be obtained by molding and sintering under normal pressure at 1500 at the following temperature.
- the zirconia powder used may be a powder produced by any method as long as the powder has a crystallite diameter of 300 or less and a BET specific surface area of 8 m 2 / g or more. As the precursor powder, any powder can be used as long as it produces the zirconia powder by pyrolysis.
- c-alumina powder or a precursor powder thereof can be used without particular limitation as long as the above-mentioned condition is satisfied.
- the zirconium powder and alumina powder used as raw materials include a zirconium salt or a zirconium salt and an aqueous dispersion containing a stabilizer, alumina powder and a precipitant, and a zirconium compound and alumina.
- Alumina-zircoure composite powder obtained by forming a composite precipitate and calcining the composite precipitate is particularly preferred.
- this method is described as follows: a zirconium salt aqueous solution or zirconium salt Aqueous dispersion of alumina salt and stabilizer with alumina powder added to ammonia water and stirred to form precipitate, or stable with zirconium salt aqueous solution or zirconium salt There is a method in which an aqueous solution of an agent is added to a dispersion liquid composed of alumina powder and ammonia water, followed by stirring to form a precipitate.
- the zirconium salt may be any water-soluble zirconium salt that produces a hydrated oxide by pH adjustment and a zirconia by calcining.
- Examples include oxychloride, oxynitrate, oxynitrate, and oxysulfate. And the like.
- the crystallite diameter of the raw material zirconia powder exceeds 300 A, or the BET specific surface area is less than 8 m 2 / g, or or exceeds lO ⁇ m, high if the BET specific surface area is less than 5 m z / g, reduced sintering promotion effect by the transition metal compound, was sufficient. in densified at low temperature below sintering at 1500 A sintered body with a high density cannot be obtained.
- the addition amount of the transition metal compound is 0.01 to 1.0%, preferably 0.5% or less, as an atomic ratio to the total of the transition metal and Zr. If it is less than 0.01%, the effect of promoting sintering is small, and if it exceeds 1.0%, the properties of the sintered body may be affected, which is not preferable.
- the transition metal compound to be used can be used without any particular limitation as long as it generates an oxide by thermal decomposition, but it is preferable to use a compound soluble in water or an organic solvent as a solution.
- Specific examples of the transition metal compound include an inorganic compound such as a nitrate and an organic acid salt such as a carboxylate.
- Removal and drying of the solvent are usually carried out by the evaporation method. If the transition metal compound is not soluble in water or an organic solvent, or if the transition metal compound is soluble but has been precipitated using a precipitant in advance, the filtration method is used. Remove solvent You can do it. It is also possible to efficiently and effectively process a large amount of powder by employing a spray drying method or the like.
- Zirconia powder or its precursor powder, or-alumina powder or its precursor powder and powder obtained by mixing the transition metal compound can be used as a raw material for sintering.
- any known method may be employed, but the purpose can be sufficiently achieved by the normal-pressure sintering method in an air atmosphere.
- the sintered body obtained by the method of the present invention has an average crystal grain diameter of zirconia in the sintered body of 1.0 or less, preferably 0.5 ⁇ or less, and a tetragonal phase content of 65% or more, preferably 80% or more. Further, the average crystal grain size of the Alpha 1 2 0 3 3 or less, and preferred rather is less 2 m.
- sintering is improved by performing sintering in the presence of a transition metal compound having Mn, Fe, Co, Ni, Cu or Zn as a metal species, and excellent high-density aluminum is obtained. A zircon your sintered body is obtained.
- the high-density alumina-zirconia sintered body of the present invention maintains a high tetragonal phase content even when the zirconia content is increased when the content of the stabilizer is low.
- High hardness and high toughness can be obtained. This means that grain growth in the sintered body is suppressed and fine zirconium Indicates that your particles are well dispersed.
- the transition metal compound suppresses the grain growth of the zirconia particles and the alumina particles and densifies the sintered body.
- Zr0 2 particles good rather dispersed in [alpha] 1 zeta 0 3, at the same time to suppress the grain growth of A 1 2 0 3 particles, since suppressing the transformation from tetragonal to monoclinic, increases the toughness It works.
- the powder, an alumina powder having the powder characteristics shown in Table 2, and an ethanol solution in which nitrates of each transition metal were dissolved were charged into a milling bottle, mixed, pulverized, and then mixed with ethanol. After evaporation and drying, a raw material powder for producing a sintered body having a transition metal compound content shown in Table 3 was obtained.
- This compact was sintered at the temperature shown in Table 3 for 3 hours, ⁇ A zirconia sintered body was obtained.
- alumina-Jirukoyua powder omitted addition of transition metal compound, Y 2 0 3 content of 3.0 mol% to over Ru raw material powder, preferably no powder properties as a raw material powder of the present invention a method alumina powder or Jirukonia powder A sintered body was manufactured by using.
- Tables 1, 2 and 3 show the measured characteristic values.
- the crystallite diameter D was determined based on the Scherrer equation shown below.
- the measurement was performed using Micromeritics (manufactured by Shimadzu Corporation).
- a bitter indenter was driven into the surface of the mirror-polished sample, and the size of the obtained indentation and the length of the crack generated from the indentation were calculated by the following equation proposed by Niihara et al.
- the driving load of the indenter was 50 kgf.
- the surface of the sample was polished with a 3 m diamond slurry, X-ray diffraction was performed, and light emission was performed using the following equation.
- the (ll) t diffraction peaks include the cubic (ll) c diffraction peak, but all were calculated as tetragonal.
- the fracture surface of the obtained sintered body was observed using a scanning electron microscope, and the crystal grain size was measured.
- Zr0 2 of the tetragonal phase content in the sintered body 95% or more, Zr0 2 grain size 0.3 to 0.8 m, and A 1 2 0 3 grain size 1-2 m.
- Example 2 Use acetates of transition metals and use methanol instead of ethanol Except for using, the same treatment as in Example 1 was performed to obtain a raw material powder for producing a sintered body having a transition metal compound. The obtained raw material powder was molded and fired in the same manner as in Example 1 to obtain a high-density alumina-zirconia sintered body. The characteristics of the sintered body were measured in the same manner as in Example 1.
- a predetermined amount of cc-alumina powder (crystallite diameter 0.4 ⁇ m, specific surface area 8 m 2 / g) is added to a ZrOCl 2 aqueous solution (or a ZrOCl 2 aqueous solution containing a stabilizer), and dispersed by ball milling. I let it. This dispersion is added to excess ammonia water at a rate to maintain the pH at 9 or higher, and after stirring, the generated precipitate is filtered, washed with water, and dried to form a composite precipitate of alumina and a zirconium compound. Obtained. The obtained composite precipitate was calcined at 900, wet-pulverized by ball milling, and dried to obtain an alumina-zirconia composite powder.
- the obtained raw material powder was molded and fired in the same manner as in Example 1 to obtain a high-density alumina-zirconia sintered body.
- the characteristics of the sintered body were measured in the same manner as in Example 1. Table 3 shows the measurement results.
- Zr0 2 of the tetragonal phase content in the sintered body 95% or more Zr0 2 crystal grain size of the crystal grain size 0.5-1 and A 1 2 0 3 is range of 1 to 3 fi m Confirmed that
- Example 2 -14 A- 4 20 4.20 5.8 1510 62
- the high-density alumina-zirconia sintered body of the present invention has a very high sintering density and high strength having excellent rupture toughness (K lc ), bending strength and hardness. It is a high toughness and high hardness sintered body.
- the use of fine zirconia powder and the effect of promoting sintering by the transition metal compound enable the production of a high-density alumina zirconia sintered body by low-temperature sintering.
- the grain growth of the zirconia is suppressed, and the crystal phase of the zirconia particles in the sintered body increases even if the percentage of partially stabilized zirconia is increased and the content of the stabilizer is reduced, the zirconia in the sintered body is reduced. Can be maintained in a tetragonal phase.
- grain growth of alumina in the sintered body is also suppressed at the same time. Due to both of these effects, the sintered body has excellent toughness with a fracture toughness value of 7 or more and 12 / in 3 / z , not only excellent bending strength, but also high hardness. .
- the sintered body of the present invention can be expected to be applied to wear-resistant materials and mechanical members as a high-strength functional ceramic, but is particularly effective for improving the performance of cutting tools and ceramics. It is.
- the present invention provides an alumina-zirconia sintered body having high density, high strength, high hardness and excellent toughness, and a method for producing the same, and its industrial significance is extremely large.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8686905404T DE3683283D1 (de) | 1985-09-06 | 1986-09-04 | Hochdichter sinterwerkstoff aus tonerde-zirkonerde und verfahren zu seiner herstellung. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60/197155 | 1985-09-06 | ||
JP60197155A JPS6259565A (ja) | 1985-09-06 | 1985-09-06 | 高密度アルミナ・ジルコニア焼結体およびその製造方法 |
JP60/210710 | 1985-09-24 | ||
JP60210710A JPS6291419A (ja) | 1985-09-24 | 1985-09-24 | 易焼結性アルミナ・ジルコニア複合粉末の製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1987001369A1 true WO1987001369A1 (en) | 1987-03-12 |
Family
ID=26510202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1986/000449 WO1987001369A1 (en) | 1985-09-06 | 1986-09-04 | High-density alumina-zirconia sinter and process fro its production |
Country Status (6)
Country | Link |
---|---|
US (1) | US4772576A (ja) |
EP (1) | EP0236507B1 (ja) |
AU (1) | AU591928B2 (ja) |
CA (1) | CA1259080A (ja) |
DE (1) | DE3683283D1 (ja) |
WO (1) | WO1987001369A1 (ja) |
Cited By (1)
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1986
- 1986-09-03 CA CA000517390A patent/CA1259080A/en not_active Expired
- 1986-09-04 US US07/052,858 patent/US4772576A/en not_active Expired - Fee Related
- 1986-09-04 DE DE8686905404T patent/DE3683283D1/de not_active Expired - Fee Related
- 1986-09-04 WO PCT/JP1986/000449 patent/WO1987001369A1/ja not_active Application Discontinuation
- 1986-09-04 AU AU62889/86A patent/AU591928B2/en not_active Ceased
- 1986-09-04 EP EP86905404A patent/EP0236507B1/en not_active Expired
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DE2549652B2 (de) * | 1975-11-05 | 1980-05-29 | Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V., 3400 Goettingen | Keramikformkörper hoher Bruchzähigkeit |
DE2744700C2 (de) * | 1977-10-05 | 1987-05-27 | Feldmühle AG, 4000 Düsseldorf | Sinterwerkstoff auf Basis von dichten, nichtmetallischen Hartstoffen wie hochschmelzenden Metallcarbiden, Metallnitriden, Metallboriden und Metalloxiden mit darin eingelagerten Zirkon- und/oder Hafniumoxid |
DE3233019A1 (de) * | 1982-09-06 | 1984-03-08 | Max Planck Gesellschaft zur Förderung der Wissenschaften e.V., 3400 Göttingen | Keramikformkoerper, verfahren zu seiner herstellung und seine verwendung |
JPS59190259A (ja) * | 1983-02-25 | 1984-10-29 | 日立金属株式会社 | 高硬度高靭性Al↓2O↓3系焼結材料 |
Non-Patent Citations (1)
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112605385A (zh) * | 2020-12-16 | 2021-04-06 | 蚌埠飞宇轴承有限公司 | 一种降低轴承摩擦损耗的轴承材料的加工方法 |
Also Published As
Publication number | Publication date |
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AU591928B2 (en) | 1989-12-21 |
AU6288986A (en) | 1987-03-24 |
CA1259080A (en) | 1989-09-05 |
EP0236507A4 (en) | 1988-01-07 |
EP0236507B1 (en) | 1992-01-02 |
DE3683283D1 (de) | 1992-02-13 |
EP0236507A1 (en) | 1987-09-16 |
US4772576A (en) | 1988-09-20 |
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