WO2005073418A1 - タングステン系焼結体およびその製造方法 - Google Patents
タングステン系焼結体およびその製造方法 Download PDFInfo
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- WO2005073418A1 WO2005073418A1 PCT/JP2005/001274 JP2005001274W WO2005073418A1 WO 2005073418 A1 WO2005073418 A1 WO 2005073418A1 JP 2005001274 W JP2005001274 W JP 2005001274W WO 2005073418 A1 WO2005073418 A1 WO 2005073418A1
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- tungsten
- sintered body
- based sintered
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- the present invention relates to a tungsten-based sintered body and a method for manufacturing the same.
- electrodes for discharge lamps sputtering targets, crucibles, radiation shielding members, resistance welding electrodes, semiconductor element mounting substrates, structural members, contact points for switches, semiconductor manufacturing using tungsten-based sintered bodies are also used.
- the sintering of a tungsten-based sintered body is generally performed by a method in which electrodes are attached to both ends of a rod-shaped tungsten compact and a current is applied thereto at a high voltage for sintering. Have been.
- the electric current sintering method has four major disadvantages.
- the first point is that terminals are connected to both ends of a rod-shaped molded body, and sintering is performed in an atmosphere gas while energizing, so that the degree of freedom of the shape of the sintered body is extremely low.
- sintering is performed in an atmosphere gas while energizing, so that the degree of freedom of the shape of the sintered body is extremely low.
- the second point is that a sufficient density cannot be obtained unless processing is performed after electrical sintering. Density increases by swaging or other forging after electric sintering, but the shape is more limited. In addition, in order to increase the density by plastic casting such as forging, it is necessary to further increase the size of the sintered body before forging in order to obtain a large sintered body with sufficient density. Requires special equipment. In addition, since the tungsten-based sintered body has high strength at high temperatures, high pressure and heat are required even when processing is performed with the above-described dedicated equipment, and a large manufacturing cost is required.
- the third point is that the crystal structure is deformed by forging. For example, when swaging is performed after sintering, the crystal structure is oriented and anisotropy occurs in strength, electric resistivity, heat conduction, and the like. Therefore, the sintered body lacks uniformity.
- the fourth point is that dislocations are introduced by forging, and when the temperature is increased after processing, a recrystallization phenomenon occurs at a certain temperature or higher. As a result, the properties of the sintered body are significantly changed, which may have an adverse effect.
- Patent Document 1 discloses a method of performing hot isostatic pressing (HIP) as needed. This technique was sintered powder tungsten powder was pressed at 140 310 MPa in a non-oxidizing atmosphere density 17. 7- 18. 4g / cm 3, followed by 1850 ° C, the HIP treatment at ⁇ Noregongasu 1360 one 1940 atm It is a technology that makes the density 18.9-19.2 g / cm 3 by performing.
- HIP hot isostatic pressing
- Patent Document 2 molding is similarly performed at a press pressure of 98 to 147 MPa, and a hydrogen atmosphere of 1600 to 1700 is used.
- C sintered body of rows Rere density 17.0 one 18. 2g / cm 3, then an argon gas atmosphere 1460 ° C, a method of performing the HIP processing at 1800atm disclosed Have been.
- the tungsten sintered bodies obtained by the production methods of Patent Documents 1 and 2 have a maximum theoretical density of 99.3%, a force having an upper limit of 19.16 g / cm 3 , for example. Since the density of the large electrode used in the empty system light source is not high enough, gas and impurities accumulate in the pores of the sintered body and are released during lighting, causing a great adverse effect. In porosity sufficient tungsten-based sintered body in the amount of pore is not adversely affected by the good tool pores smaller the is less than 0.5%, a density of pure tungsten 19. 25 g / cm 3 or more Yes (density depends on type and amount of additive).
- Patent Document 1 U.S. Pat.No. 4,612,162
- Patent Document 2 Patent No. 3121400
- the present invention has a relative density of 99.5, which was not obtained by the prior art. / 0 or more (pore volume ratio is 0.
- An object of the present invention is to obtain a tungsten-based sintered body having a uniform structure and isotropy.
- the average crystal grain size of the sintered body is 30 zm or less, the composition is tungsten, doped tungsten with 100 ppm or less (excluding Oppm) of alkali metal added to tungsten, cerium, thorium, lanthanum, yttrium, strontium, At least one of oxides of calcium, zirconia, and hafnium is added at a maximum of 4% by weight (excluding 0% by weight). It is at least one type of alloy of tungsten and molybdenum.
- Another object of the present invention is to obtain a tungsten-based sintered body in which the number of pores having a major axis of 1 ⁇ m or more and present in a unit sectional area of lmm 2 in the sintered body is 10000 or less.
- the differential force between the hardness of the surface of the sintered body and the hardness of the inside of the sintered body must be 1.0 or less in HRA (Rockwell hardness, A scale).
- the recrystallization temperature must be at least 1600 ° C or higher.
- the ratio between the maximum value and the minimum value of the thermal conductivity between any two points in the sintered body is 1.1 or less.
- An object was to obtain a member for an apparatus, a member for an ion implantation apparatus, and a member in a fusion reactor.
- the present invention provides an oxide of tungsten or an alkali metal in tungsten of not more than ⁇ pm (excluding Oppm) or an oxide of cerium, thorium, lanthanum, yttrium, strontium, calcium, zirconium, or hafnium.
- weight 0/0 at least one of Below (0 not include the weight 0/0) consists of at least one of doped tungsten or tungsten and an alloy of molybdenum added, the crystal structure has an isotropic, relative density 99.5% or more
- a tungsten-based sintered body having an average crystal grain size of 30 ⁇ m or less.
- tissue is isotropic and uniform. Therefore, the mechanical, electrical, and discharge characteristics are constant and stable regardless of the direction.
- the average grain size of the sintered body is preferably not more than 30 ⁇ m, since the strength is greatly reduced when the grain size is large.
- additives can be added to the tungsten-based sintered body depending on the application, for the purpose of improving discharge characteristics, increasing the recrystallization temperature, and suppressing grain growth. These are selected from among alkali metals with a strength of less than 100 ppm and cerium, thorium, lanthanum, yttrium, strontium, calcium, zirconium, hafnium, and molybdenum with a strength of less than 100 ppm depending on the use of the sintered body. In addition, in cases where discharge characteristics are required or in applications where the above-mentioned additives are disliked, high-purity tungsten (99.95-99.99999%) may be suitable.
- the present invention according to claim 2, claim 1, the number of major axis force Sl m or more pores present in unit cross-sectional area of lmm 2 of the sintered body, characterized in that it is 10,000 or less It is a tungsten-based sintered body described in (1).
- a sintered body having a relative density of 99.5% or more may not be suitable for use depending on the form and distribution of pores in the sintered body.
- pores with a diameter exceeding 5 zm they may cause deformation when used at high temperatures, and gas may easily accumulate in the pores.
- the pore distribution it is preferable that pores having a diameter of 1 ⁇ m or less and as small as possible are uniformly dispersed.
- the number of pores larger than 1 a is preferably as small as possible. It is sufficient if the pore size is 10000 or less in a unit sectional area of lmm 2 in the sintered body.
- the pores are likely to move under the use environment and may be outside the sintered body. Because it is hard to be released Good.
- the present invention according to claim 3 is characterized in that the difference in hardness HRA between the surface and the inside of the sintered body is 1.0 or less, and the tungsten according to claim 1 or claim 2 This is a sintered body. If there is a difference in hardness between the surface and the inside, workability when processing into a product will be worse, and it will also adversely affect the surface roughness of the finished surface and mechanical properties such as wear resistance as a structural material.
- the allowable hardness difference for preventing these adverse effects is 1.0 or less in HRA.
- the present invention according to claim 4 is characterized in that the recrystallization temperature is at least 1600 ° C or higher, and the tungsten-based sintered body according to any one of claims 1 to 3 is characterized in that is there. Recrystallization occurs at a low temperature (1300-1500 ° C) so that the sintered body is subjected to plastic processing such as forging.
- the recrystallization temperature of the tungsten-based sintered body of the present invention is extremely high because plastic quenching such as forging is not performed.
- Sintered bodies with a recrystallization temperature lower than 1600 ° C undergo recrystallization when used for lamp electrodes and high-temperature structural materials, and particularly thin parts are slipped and deformed at grain boundaries. For this reason, it is preferable that the recrystallization temperature of the structural member / electrode used in a high temperature atmosphere is higher, more preferably 2000 ° C or higher.
- the present invention described in claim 5 is characterized in that the ratio between the maximum value and the minimum value of the electrical resistivity between any two points in the sintered body is 1.1 or less.
- the electrical resistivity of the sintered body is an important design factor. If the electrical resistivity greatly differs between any two points in the sintered body, it is necessary to provide a large width to the design without constant current flow, heat generation when switching contacts, arc resistance, wear, etc. Occurs.
- the ratio between the maximum value and the minimum value at which the electrical resistivity in any direction in the sintered body is close to constant is 1.1 or less. Therefore, it can be used for these applications without considering the directionality of the sintered body.
- the present invention described in claim 6 is characterized in that the ratio between the maximum value and the minimum value of the thermal conductivity between any two points in the sintered body is 1.1 or less.
- the thermal conductivity is important. Heat transfer If the conductivity greatly differs between any two points in the sintered body, the heat dissipation efficiency, temperature gradient, etc. are not fixed, and the design
- the ratio between the maximum value and the minimum value at which the thermal conductivity between any two points in the sintered body is close to constant is 1.1 or less. Therefore, it can be used for these applications without considering the directionality of the sintered body.
- the present invention described in claim 7 is an electrode for a discharge lamp comprising the tungsten-based sintered body according to any one of claims 1 to 6.
- Various characteristics are required for electrodes for discharge lamps, and the main ones are listed below.
- the electrode for a discharge lamp of the present invention is made of a tungsten-based sintered body, the discharge characteristics are excellent.
- Tungsten may be selected from high-purity tungsten and tungsten doped with less than 100 ppm of an alkali metal, depending on the intended use and the filling gas.
- the electrode for a discharge lamp of the present invention has a very small number of pores and a small number of pores exceeding 1 ⁇ , so that the generation of gas as a pollution source is extremely small.
- the pore distribution is uniform throughout the sintered body, the degree of contamination is not affected by the shape of the electrode.
- the electric resistance may be affected by the directionality of the crystal of the sintered body. Abnormality High reliability against heat generation.
- the lamp for a discharge lamp of the present invention has a high recrystallization temperature, deformation can be suppressed even in a thin electrode that is difficult to recrystallize even during use.
- the present invention described in claim 8 is a sputtering target made of the tandaust-based sintered body according to any one of claims 1 to 6.
- Sputtering targets are required to be low in impurities and low in pores. If there are many pores, uneven wear around the pores during use (hereinafter referred to as “partial wear”) will occur.
- the sputtering tag of the present invention Since the kit has a high relative density of 99.5% or more, uneven wear is unlikely to occur. In addition, since the number of pores is small, it is possible to prevent contamination of the object to be sputtered due to impurities having extremely small amounts of gas and impurities existing therein.
- the present invention described in claim 9 is a crucible made of the tundast-based sintered body according to any one of claims 1 to 6.
- Tungsten-based sintered bodies are suitable for crucibles used at high temperatures, but the problem in that case is contamination from the crucible.
- the components to be contaminated differ depending on the use environment and the components to be melted in the crucible, but most of the contaminant components are gas inside the pores of the crucible and components adhering to the pore walls.
- the amount of the pores is very small, it is possible to minimize the gas which is a polluting source and the contamination with a small amount of adhesive components.
- the present invention described in claim 10 is a radiation shielding member made of the tantalum-based sintered body according to any one of claims 1 to 6. Radiation shielding capacity is proportional to the density of the shielding material.
- the radiation shielding material of the present invention has a density of 19.25 g / cm 3 or more when high-purity tungsten is used, and its radiation shielding ability is higher than that of a conventional radiation shielding material made of a tungsten-based sintered body. Ray.
- An eleventh aspect of the present invention is a member for a resistance welding electrode comprising the tantalum-based sintered body according to any one of the first to sixth aspects.
- a tungsten-based sintered body may be used for the tip portion of the electrode for resistance welding.
- the characteristics required for the member are various, such as welding resistance, heat resistance, and electrical resistivity, but the conventional tungsten-based sintered body has a drawback of low thermal shock resistance.
- the resistance welding electrode of the present invention has a strong thermal shock resistance in all directions because the crystal structure with few pores has no directionality. Therefore, cracks and chips due to thermal shock are less likely to occur, and even if cracks or chips occur, they are difficult to propagate. Therefore, it shows excellent characteristics as a member for resistance welding electrodes.
- a twelfth aspect of the present invention is a semiconductor element mounting substrate made of the tantalum-based sintered body according to any one of the first to sixth aspects.
- the characteristics required for a semiconductor element mounting substrate are a certain coefficient of thermal expansion and thermal conductivity. Since the semiconductor element mounting substrate of the present invention has no directionality in the crystal structure, there are few pores in which the directionality of thermal expansion is not sufficient. High thermal conductivity. As a result, heat is efficiently dissipated in all directions and exhibits excellent characteristics as a semiconductor element mounting substrate.
- a thirteenth aspect of the present invention is a structural member comprising a tundene-based sintered body according to any one of the first to sixth aspects.
- the structural member can be manufactured in various shapes such as a block shape, a pipe shape, a plate shape, and a rod shape according to the use.
- structural members used in a high-temperature environment are required to have strength in an operating environment and not to pollute the environment.
- the structural member of the present invention is extremely unlikely to contaminate the use environment.
- the structural member of the present invention has a high recrystallization temperature, it can be used without causing recrystallization.
- the conventionally used tungsten-based sintered body had a low recrystallization temperature, and thus was recrystallized during use, and the high-temperature strength was significantly reduced.
- the present invention described in claim 14 is a switch contact made of the tantalum-based sintered body according to any one of claims 1 to 6.
- the characteristics required for switch contacts are high melting point and electrical resistivity.
- the melting point of the semiconductor element mounting substrate of the present invention is the same as that of a conventional tungsten-based sintered body. Since the number of force pores is small, the thermal conductivity is high and the force is almost constant in any direction. As a result, heat is efficiently dissipated in all directions and exhibits excellent characteristics.
- a fifteenth aspect of the present invention is a member for a semiconductor manufacturing apparatus comprising the tantalum-based sintered body according to any one of the first to sixth aspects.
- High melting point, non-magnetic material, high plasma resistance and tungsten material are suitable for components for semiconductor manufacturing equipment.
- the product of the present invention is particularly suitable because the purity of the semiconductor and peripheral members is small due to its high purity.
- the present invention according to claim 16 is the member for an ion implantation apparatus, which is a tantalum-based sintered body according to any one of claims 1 to 6.
- a tungsten sintered body is suitable because they are exposed to plasma or high temperature during use. Therefore, it is suitable for a source container of an ion implantation apparatus, particularly an ion implantation apparatus.
- the product of the present invention has high purity, high density, few pores, and small pores, which reduces contamination on semiconductor wafers and high plasma resistance. Especially good for.
- the present invention described in claim 17 is an internal member of a nuclear fusion reactor comprising the tantalum-based sintered body according to any one of claims 1 to 6.
- tungsten since tungsten has a high melting point, it is difficult to melt in a furnace. In addition, even at high temperatures where sputtering resistance is high, it does not easily turn into steam.
- the present invention according to claim 18 is characterized in that, as the raw material powder, tungsten whose powder has an average particle size of 0.5 ⁇ m 4 ⁇ m, doped tungsten obtained by adding 100 ppm or less of alkali metal to tungsten, or cerium to tungsten.
- the method for producing a tungsten-based sintered body of the present invention has the following features 1.- 6.
- the raw material powder is at least one of oxides of tungsten, cerium, thorium, lanthanum, yttrium, strontium, calcium, zirconium, and hafnium.
- Tungsten material added with a maximum of 4% by weight, alloy of tungsten and molybdenum, or misalignment.
- the average particle size of the powder is 0.5 ⁇ m to 4 ⁇ m.
- the pressure of CIP treatment of powder must be 350MPa or more.
- Sintering should be performed in a hydrogen gas atmosphere with a sintering temperature of 1600 ° C or more and a holding time of 5 hours or more.
- HIP should be performed with argon gas at 150MPa or more and 1900 ° C or more.
- the average particle size of the powder is 0.5 ⁇ m—4 ⁇ m
- the reason why the average particle size is set to 0.5 / im or more is that tungsten powder having a size of 0.5 / im or less is extremely active and oxidized even if it is difficult to produce industrially and can be produced by strong pulverization or the like. This is because the powder is difficult to handle.
- the reason for setting the average particle size to 4 zm or less is that the use of a powder having a larger particle size deteriorates the sinterability during sintering.
- the pressure of CIP treatment of powder is 350MPa or more.
- Patent Document 1 and Patent Document 2 are 140 310 MPa and 100-150 MPa, respectively. At a pressure in this range, tungsten powder with an average particle size of 0.5 ⁇ m 4 ⁇ m cannot be sufficiently crushed.
- Figure 1 shows the relationship between the CIP pressure using 1-zm powder and the density of the sintered tungsten compact after sintering. The sintering condition is a hydrogen atmosphere at 1700 ° C for 10 hours.
- Fig. 1 show that the CIP pressure needs to be at least 350MPa. Below 310 MPa, a sintered body with sufficient density cannot be obtained even if the sintering temperature is increased.
- the density of the sintered body after sintering in Patent Document 1 and Patent Document 2 each 17. 7- 18. 4, 17g / cm 3 or more (specific without forth) and not any sufficient. As shown in the present invention, by setting the CIP pressure to 350 MPa or more, the sintered body density after sintering can be 18.7 g / cm 3 or more.
- Sintering is performed in a hydrogen gas atmosphere with a sintering temperature of 1600 ° C or more and a holding time of 5 hours or more.
- the sintering atmosphere needs to be a hydrogen gas atmosphere.
- the hydrogen atmosphere has a small pollution to tungsten and also has a function of removing impurities by reacting with impurities in tungsten at a high temperature.
- impurities are not sufficiently removed.
- carbon contamination occurs.
- sintering temperature is 1600 ° C or more and the holding time is 5 hours or more.
- Fig. 2 shows the results of measuring the density by sintering a powder with an average particle size of 1 ⁇ m in a hydrogen atmosphere using a pressed body subjected to CIP treatment at 400 MPa at various sintering temperatures and holding times. .
- HIP is 150MPa, 1900 with argon gas. Perform under C or higher conditions
- Table 1 shows the results of the HIP treatment performed on the sintered compact with the sintered compact density of 18.7 gZcm 3 after sintering under different conditions.
- the HIP conditions were set to 150 MPa for argon gas and 1900 ° C., and the sintered bodies having the densities of 18.3 to 19.0, respectively, were subjected to HIP treatment. From this, it can be seen that in order to sufficiently increase the density by the HIP treatment, the sintered body density after sintering is required to be 18.6 gZcm 3 or more.
- the HIP conditions In order to increase the density of the sintered body after the HIP treatment to 99.5% (19.25 g / cm 3 ) or more, the HIP conditions must be 150 Ma or more with argon gas and 1900 ° C or more. Must be done at
- the sintered body density after sintering must be at least 18.6 g / cm 3 or more.
- the tungsten-based sintered body of the present invention is a tungsten-based sintered body having a high density and a uniform structure, and isotropic in terms of hardness, thermal conductivity, and coefficient of thermal expansion where the number of pores is small and the recrystallization temperature is high. And the difference between the surface and the inside of the sintered body is extremely small.
- a raw material for obtaining a desired sintered body is prepared.
- the raw material powder is tungsten, doped tungsten with an alkali metal added to tungsten not more than 100 ⁇ m, and at least one oxide of cerium, thorium, lanthanum, yttrium, strontium, calcium, zirconium, and hafnium in tungsten. 4% by weight Addition of material or alloy of tungsten and molybdenum is selected according to the application. Depending on the application, high-purity tungsten (99. 95 99.999 99%) may be used as the tungsten.
- the particle size of the raw material powder is 0.54 ⁇ m. It is also possible to add an organic binder during powder preparation. By adding an appropriate organic binder, the moldability during CIP is improved, and it is also easy to remove the intermediate processing thereafter. The added organic binder is simultaneously debindered during sintering.
- CIP treatment should be performed in a sealed container of flexible rubber or resin.
- the powder may be directly charged, or may be preformed by, for example, a die press before the CIP processing, and then the CIP processing may be performed. You can also change the pressure and apply more than one CIP.
- the container may be CIPed in a liquid serving as a pressure medium, or a dry CIP machine (rubber press machine) may be used.
- a dry CIP machine rubber press machine
- a prerequisite for the CIP process is to apply a pressure of 350 MPa or more at least once.
- the press body after the CIP treatment is subjected to intermediate processing, if necessary, and then sintered.
- the sintering furnace is required to be capable of sintering in a hydrogen atmosphere and capable of raising the temperature to 1600 ° C or more.
- the conditions for raising the temperature are not particularly limited, but heating up to 1000 ° C does not cause any special effect on the sintered body, so that the temperature may be raised quickly.
- the temperature rise from 1000 ° C to the sintering temperature varies depending on the size of the sintered body, etc., but 1 to 30 ° CZmin is appropriate.
- the sintered body after sintering is subjected to HIP treatment.
- the HIP device can be conventional, but at least 1
- a desired tungsten-based sintered body of the present invention can be obtained by performing machining, electric machining, or the like as necessary after the HIP treatment.
- the tungsten-based sintered body obtained as described above has a particle size of raw material powder and production conditions.
- the number of pores having a major axis of 1 ⁇ m or more in the cross-sectional structure in the sintered body can be 10,000 or less in the cross-sectional area of lmm 2 in the sintered body.
- the difference in hardness between the surface and the inside of the sintered body can be less than 1.0 in HRA.
- the recrystallization temperature can be at least 1600 ° C or higher.
- the ratio between the maximum value and the minimum value of the electrical resistivity between any two points in the sintered body can be 1.1 or less.
- the ratio of the maximum value and the minimum value of the thermal conductivity between any two points in the sintered body can be 1.1 or less.
- the discharge lamp electrode, the sputtering target, the crucible, the radiation shielding member, the resistance welding electrode, the semiconductor element mounting substrate, the structural member, and the switch contact of the present invention (claims 7 to 17) , Semiconductor manufacturing equipment members, ion implantation equipment members, nuclear fusion reactor internal members, Any of them can be obtained by changing the shape by the above method.
- a tungsten powder having a purity of 99. 99% and an average particle size of 0.8 ⁇ m was used as a starting material.
- the powder was pressed in a mold press, at a pressure of 2MPa, into a cylindrical shape of ⁇ 100x250, and the pressed body was put in a sealed rubber bag and subjected to CIP processing at a pressure of 400MPa.
- the press body density was about l lg / cm 3.
- the pressed body was shaped into a discharge lamp electrode having a hemisphere at the tip of a cylinder using a lathe.
- the shaped body was sintered by maintaining it in a hydrogen atmosphere at 1800 ° C for 6 hours.
- the heating rate was 10 ° C / min up to 1000 ° C and then 4 ° C / min up to 1800 ° C.
- the sintered body was subjected to HIP treatment under the conditions of argon gas, 200 MPa, and 2000 ° C.
- the density after HIP treatment was 19.28 g / cm 3 (99.9%), almost reaching the theoretical density.
- Observation of the structure revealed that the structure had isotropic structure, and the average crystal grain size was 15 xm.
- there was no difference in the force S when comparing the structure near the surface of the sintered body after the HIP treatment and the internal structure.
- Table 3 shows the differences from the conventional discharge lamp electrodes.
- a sputtering target, a crucible, a radiation shielding member, a resistance welding electrode, a semiconductor element mounting substrate, and a switch contact which were different only in the raw material powder and shape obtained in the same manner as in Example 1, were produced. According to the characteristics of the sintered body of the present invention shown in the above, effects were obtained in terms of performance and cost.
- Structural members Density less than 99.53 ⁇ 4 For use in stainless steel tanks Low contamination Small (Used in high-temperature environments Materials
- the production method of the present invention can be applied to the production of the following tungsten sintered compact members and products.
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Abstract
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JP2005517537A JPWO2005073418A1 (ja) | 2004-01-30 | 2005-01-28 | タングステン系焼結体およびその製造方法 |
US10/585,906 US20070172378A1 (en) | 2004-01-30 | 2005-01-28 | Tungsten based sintered compact and method for production thereof |
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JP2004023767 | 2004-01-30 | ||
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PCT/JP2005/001274 WO2005073418A1 (ja) | 2004-01-30 | 2005-01-28 | タングステン系焼結体およびその製造方法 |
Country Status (3)
Country | Link |
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US (1) | US20070172378A1 (ja) |
JP (1) | JPWO2005073418A1 (ja) |
WO (1) | WO2005073418A1 (ja) |
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JP2017112121A (ja) * | 2017-02-15 | 2017-06-22 | ウシオ電機株式会社 | ショートアーク型放電ランプ |
CN111036916A (zh) * | 2019-12-13 | 2020-04-21 | 安泰天龙钨钼科技有限公司 | 一种铼合金坩埚的制备方法 |
CN111036916B (zh) * | 2019-12-13 | 2022-03-08 | 安泰天龙钨钼科技有限公司 | 一种铼合金坩埚的制备方法 |
JPWO2022215551A1 (ja) * | 2021-04-06 | 2022-10-13 | ||
WO2022215551A1 (ja) * | 2021-04-06 | 2022-10-13 | 株式会社アライドマテリアル | タングステン材料 |
JP7241983B2 (ja) | 2021-04-06 | 2023-03-17 | 株式会社アライドマテリアル | タングステン材料 |
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US20070172378A1 (en) | 2007-07-26 |
JPWO2005073418A1 (ja) | 2007-09-13 |
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