WO2005113465A1 - セラミックス、その製造方法及びそれを用いた金属蒸発用容器 - Google Patents
セラミックス、その製造方法及びそれを用いた金属蒸発用容器 Download PDFInfo
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- WO2005113465A1 WO2005113465A1 PCT/JP2005/009338 JP2005009338W WO2005113465A1 WO 2005113465 A1 WO2005113465 A1 WO 2005113465A1 JP 2005009338 W JP2005009338 W JP 2005009338W WO 2005113465 A1 WO2005113465 A1 WO 2005113465A1
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Definitions
- the present invention relates to a ceramic, a method for producing the same, and a metal vaporization container made of the ceramic.
- a metal evaporation container (hereinafter, also referred to as a “boat”) made of conductive ceramics containing titanium diboride and boron nitride is heated by applying electric current under a vacuum to form a metal wire such as aluminum. Vapor deposition is performed while supplying to the boat discontinuously or continuously.
- Known boats are a two-component boat mainly comprising titanium diboride and boron nitride (Patent Document 1), and a three-component boat further containing aluminum nitride in the two-component boat. ! / ⁇ ⁇ (Patent Document 2).
- corrosion resistance thermal shock resistance and corrosion resistance to molten metal
- the demand for the two-component boat is increasing because the two-component boat is more resistant to thermal shock than the three-component boat and is more easily cracked and has a longer life than the three-component boat.
- two-component boats tend to absorb moisture, increasing the high-temperature specific resistance r and heating the boat.
- Patent Literature 3 Patent Literature 3
- the practical conditions set the output to be used in about 2-3 minutes, When the boat was heated by heating the boat, the boat could only be heated to the operating temperature of 1450 to 1550 ° C.
- boat operating temperature This is also referred to as the “low-temperature maximum phenomenon of electrical resistance.”
- the cause of the low-temperature-side maximum phenomenon of electric resistance is that TiB is an acid during the production of a ceramic sintered body.
- Non-conductive glassy substance consisting of a B O layer or TiO layer on a part of its surface
- Patent Document 1 JP-A-59-118828
- Patent Document 2 JP-A-3-208865
- Patent Document 3 JP 2001-030760 A
- the present invention relates to a ceramic containing titanium diboride and boron nitride as main components, comprising 0.2 to 7.5% by mass of strontium and Z or a strontium compound and 0.8% by mass or less (where 0 is (Not included) and a ceramic having a relative density of 90% or more.
- the present invention relates to a strontium and 40 or strontium compound having a titanium diboride content of 40 to 60% by mass, a boron nitride content of 30 to 60% by mass, and an average particle size of 10 ⁇ m or less.
- a method for producing ceramics comprising molding a mixed raw material powder containing 5% by mass and then sintering in a non-oxidizing atmosphere at a temperature of 1700 to 2200 ° C. and a pressure of lOMPa or more.
- the present invention relates to a metal evaporation container made of the above ceramics.
- a ceramics capable of reducing the amount of gas released during heating and a method for producing the ceramics.
- the metal evaporation vessel (boat) of the present invention has a long life because the amount of gas released during heating is small.
- BEST MODE FOR CARRYING OUT THE INVENTION Conventionally, ceramics used for two-component boats have been manufactured by hot pressing a mixed powder of boron nitride and titanium boride powder. This ceramic had excellent thermal shock resistance and corrosion resistance. Gas was easily generated when heated by vacuum.
- the present inventor has determined that the cause is a low-boiling point oxidized substance such as calcium borate and oxidized boron contained in ceramics, and further studied a method of minimizing the porosity.
- a specific amount of strontium and Z or a strontium compound may be used instead of the conventional calcium compound, and the present invention has been completed.
- the ceramic of the present invention is a ceramic containing titanium diboride and boron nitride as main components, wherein calcium borate is replaced by strontium and Z or a strontium compound, and a small amount of boron oxide is present. That is the basic structure.
- the ceramic of the present invention contains 0.2 to 7.5% by mass of strontium and Z or a strontium compound. If the content of strontium and / or strontium compound is extremely low, it is not possible to suppress the decrease in mass during heating, and if the content is high, the content of boron nitride, which has excellent thermal shock resistance, will decrease, and the thermal shock of ceramics will decrease. And life is shortened.
- a particularly preferred content of strontium and Z or a strontium compound is 0.5 to 5.0% by mass. Further, the ceramic of the present invention contains 0.8% by mass or less (not including 0) of boron oxide, which promotes the effect of suppressing the amount of released gas.
- strontium compound used in the ceramics of the present invention examples include strontium oxide, strontium carbonate, strontium borate, and the like.
- Strontium and Z or a strontium compound used in the ceramic of the present invention is preferably strontium oxide.
- the components other than strontium and Z or a strontium compound and boron oxide are preferably titanium diboride and boron nitride (a specific metal and / or metal It will be described later that the addition of a compound will reduce the low-temperature maximum phenomenon of the electrical resistance of ceramics.)
- components such as titanium nitride are inevitably generated during the production of ceramics. These unavoidable components, in their sum It is preferably at most 10% by mass, particularly preferably at most 5% by mass.
- the ceramics of the present invention preferably contains 0 to 60% by mass of titanium diboride and 30 to 60% by mass of boron nitride.
- titanium diboride is significantly less than 40% by mass, the resistivity increases, and if it is significantly greater than 60% by mass, the resistivity decreases too much, prolonging the life of the boat in any case. Absent.
- the content of boron nitride is significantly less than 30% by mass, the free-cutting properties of the ceramics will be impaired, and if it is significantly greater than 60% by mass, the specific resistance will be too high.
- the ceramic of the present invention is selected from at least one metal selected from Fe, V, Mn, Cu, and Si, and Z or these metals from the viewpoint of alleviating the phenomenon of electric resistance maximizing at low temperature. It is desirable that the metal compound composed of at least one metal be contained in a total of 4% by mass or less, preferably 0.2 to 3.5% by mass of the metal and the metal compound.
- the metal compound include oxides such as FeO, VO, CuO, and MnO.
- carbides such as FeC, SiC and VC, such as borides such as FeB and VB, such as FeSi and FeS
- silicides such as i, for example, nitrides such as FeN, SiN, and V (C, N).
- the relative density of the ceramic of the present invention is 90% or more, preferably 95% or less. If the relative density is significantly smaller than 90%, the corrosion resistance will be poor, and the specific resistance will be non-uniform due to the large density distribution of the force. Therefore, the boat made of this ceramic has a distribution in the evaporation rate of metal.
- the ceramic of the present invention can be produced by the method for producing a ceramic of the present invention.
- the method for producing a ceramic according to the present invention comprises titanium diboride, boron nitride, a predetermined amount of strontium and Z or a strontium compound, and is selected from Fe, V, Mn, Cu and Si as necessary. And then sintering the mixed raw material powder containing at least one metal selected from the metals and metal compounds of these metals and Z or a metal compound.
- strontium and Z or a strontium compound having an average particle size of 10 m or less preferably 0.5 to 8 strontium
- strontium and Z or a strontium compound having an average particle size of 10 m or less preferably 0.5 to 8 strontium
- the ratio of strontium and Z or scan strontium compound is significantly less than 0.5 mass 0/0, or strontium ⁇
- the average particle size of Zr or Z or strontium compound exceeds 10 m, it becomes difficult to produce ceramics having a relative density of 90% or more. If the ratio of strontium and Z or the strontium compound is significantly larger than 8.5% by mass, the thermal shock resistance of the obtained ceramic may be reduced.
- Strontium and Z or a strontium compound preferably have an average particle size of 5 ⁇ m or less.
- titanium diboride powder contains 40 to 60% by mass
- boron nitride powder contains 30 to 60% by mass. , Prefer to,.
- titanium diboride powder those produced by a method utilizing a direct reaction with metallic titanium or a reduction reaction of an oxidized compound such as oxidized titanium are used.
- the average particle size is preferably 20 / zm or less, and the oxygen content is preferably 1.5% by mass or less.
- Examples of the boron nitride powder include a method of heating a mixture of borax and urea at 800 ° C. or higher in an ammonia atmosphere, and a method of mixing a mixture of boric acid or boron oxide and calcium phosphate with a nitrogen-containing compound such as ammonium or dicyandiamide. Used by heating to 1600 ° C or more.
- the average particle size is preferably 10 m or less, particularly 5 m or less, and the oxygen content is preferably less than 3%.
- the amount of oxygen can be reduced by a method of heat-treating the boron nitride powder in a vacuum or a non-oxidizing atmosphere, a method of removing boron oxide by washing with methanol, and the like.
- metal powder and the metal compound powder those described above can be used.
- metal powder and the metal compound powder those described above can be used.
- Cu metal V metal, for example, copper oxide such as CuO, CuO and FeSi.
- iron-silicone swords such as FeSi.
- iron silicides such as FeSi and FeSi.
- the average particle diameter of the metal powder and the Z or metal compound powder is preferably 100 m or less, more preferably 50 m or less, and particularly preferably 20 m or less.
- Metal powder and Z or metal compound powder are BN powder and TiB
- the powder is mixed with a strontium powder and a mixed powder of Z or a strontium compound powder, and the power is also blended.
- the metal powder contained in TiB powder etc. And the ratio of z or the metal compound powder.
- the mixing of the raw materials is performed by a mixer such as a ball mill, a vibration ball mill, a Henschel mixer, a ball-ton mill, etc., followed by sintering after molding.
- a mixer such as a ball mill, a vibration ball mill, a Henschel mixer, a ball-ton mill, etc.
- the mixed raw material powder Prior to compacting, it is preferable that the mixed raw material powder is granulated to 0.5 to 2 mm, which makes it easier to achieve a relative density of 90% or more.
- the granulation method include a wet granulation method such as a spray dryer method and a tumbling granulation method, and a dry granulation method in which a mixed raw material powder is compression-molded and then roughly crushed and granulated. Dry granulation is preferred to minimize oxidation of.
- the molding is carried out, for example, by uniaxial pressing or cold isostatic pressing at 50 MPa or less, preferably 20 MPa or less.
- the sintering is performed under a non-oxidizing atmosphere such as nitrogen, helium, argon, or vacuum at a temperature of 1700 to 2200 ° C and a pressure of lOMPa or more. If the pressure is less than 10 MPa or the temperature is less than 1700 ° C, ceramics with a relative density of 90% cannot be produced. Above 2200 ° C, thermal decomposition of boron nitride occurs.
- Titanium diboride powder (oxygen content 1.1 mass%, average particle diameter 14. 2 / zm), boron nitride powder (acid elementary charge 1.9 mass 0/0, the average particle diameter of 5. 0 m), strontium oxide Powder (average particle size: 2. O ⁇ m, 7. O / zm and 14.7 / zm) and oxidized canola recipe powder (average particle size: 8.1111) were used in a ball mill at the ratios shown in Tables 1 and 2. And mixed to prepare a mixed raw material powder.
- Ceramic composition Determination of boron oxide by a methanol extraction method. ICP emission spectrometer (SII “SPS-1700R”) and oxygen and nitrogen analyzer (HORIBA “EMGA-620WZC”). They were analyzed by the multiple regression calculation method to determine the composition.
- Example 1 Example 2
- Example 3 Example 4 [ ⁇ ] ss2ow Mixed raw material powder Titanium diboride powder 45.0 50.0 55.0 50.0
- Boron nitride powder 4 7. 0 46.5 54.5 56.5 stonium oxide average particle diameter 7.0 urn 8.0 3.5 3.5 1.0-powder
- Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Mixed Raw Material Powder Titanium Diboride Powder 50.0 5 0.0 5 0.0 50.0 50.0 50 0 50. 0 50. 0 End
- Average particle size of calcium oxide powder 8.1 ⁇ m ⁇ 1.4 ⁇ ⁇ 1 ⁇ Sintering temperature ⁇ 2000 2000 2000 2000 200 0 1650 2000 2250 Sintering pressure (MPa) 30 30 30 30 30 5 30 Ceramic composition Titanium diboride 49.1 48.6 47.5 48.7 49.1 49.3 49.2
- a boat was manufactured in the same manner as in Example 1, except that various metal powders or metal compound powders shown in Tables 3 and 4 were blended. For these boats, (1) ceramic composition, (2) grain boundary phase of ceramics, (3) relative density, (4) mass reduction, and (5) boat life were measured in the same manner as in Example 1. did. (6) The boat specific resistance was measured as follows. Tables 3 and 4 show these results together with the results of Example 1.
- a boat was produced in the same manner as in Example 1 except that strontium carbonate powder (average particle diameter: 0.9, purity: 99.9% by mass or more) was used instead of strontium oxide powder, and mixed raw material powders shown in Table 4 were prepared. Was manufactured. Table 4 shows the results.
- amorphous such as an oxide (CaO, Ti0 2, etc.).
- Grain boundary phase TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN, TiN
- Example 16 Example 17 Mixed raw material Titanium diboride powder 45.1 45.0 44.8 45.2 45.0 Powder Boron nitride powder 46.9 47.0 47.2 46.8 47.0 (% by mass) Strontium oxide powder 7.5 7.7 7.5- ⁇ Strontium carbonate powder ⁇ ⁇ ⁇ 8.0 1.5 Iron powder (average particle size 50 m) ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ Manganese powder (average particle size 50ii m) ⁇ ⁇ ⁇ I ⁇ Silicon powder (average particle size 50 ⁇ m) ⁇ ⁇ ⁇ ⁇ Vanadium powder (average particle size 50 ⁇ m) ⁇ ⁇ ⁇ ⁇ Copper monoxide ( ⁇ ) powder (average particle size 50 ⁇ m) ⁇ ⁇ 1-1 0.3 Copper oxide (I) powder (average particle size 50 ⁇ m) m) ⁇ 0.3 ⁇ ⁇ ⁇ Copper powder (average particle size 50 ⁇ m) m) ⁇ 0.3 ⁇ ⁇ ⁇ Copper powder (average particle size 50 ⁇ m) m)
- Grain boundary phase TiN, SrO TiN, SrO TiN, SrO TiN , SrO TiN, SrO Relative density (%) 97.1 97.1 97.0 96.8 97.2
- Weight loss rate (% by mass) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Boat life (number of vapor depositions) 200 212 218 195 222 Boat specific resistance 25 ° 0 ( ⁇ -cm) 815 780 785 850 795 Service temperature ( ⁇ -cm) 3100 3105 3050 3450 2950 Measurement temperature (° C) 1550 1550 1550 1550 1550 Resistance peak value ( ⁇ -cm) ⁇ ⁇ ⁇ 4850 ⁇ ) 1 ⁇ ⁇ 1220 ⁇
- the ceramic of the present invention is used as a boat, a crucible, and the like. It is used as a metal evaporation container for depositing a metal on the plastic or the like of the present invention.
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- 2004-05-24 JP JP2004152721A patent/JP2007254159A/ja active Pending
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- 2005-05-24 TW TW094116955A patent/TW200604132A/zh unknown
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JPS59118828A (ja) * | 1982-12-22 | 1984-07-09 | ユニオン・カ−バイド・コ−ポレ−シヨン | 二硼化チタン−窒化硼素金属間組成物の高温曲げ強さを改善する方法 |
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JPH03208865A (ja) * | 1989-11-20 | 1991-09-12 | Boride Ceramics & Composites Ltd | 耐火物複合物品の製造方法 |
JPH06298566A (ja) * | 1993-04-15 | 1994-10-25 | Denki Kagaku Kogyo Kk | 導電性セラミックス焼結体及びその用途 |
JPH07315937A (ja) * | 1994-05-20 | 1995-12-05 | Denki Kagaku Kogyo Kk | 窒化ホウ素常圧焼結体及びその製造方法 |
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