WO2010100808A1 - レニウムタングステン線、その製造方法およびそれを用いた医療用針 - Google Patents
レニウムタングステン線、その製造方法およびそれを用いた医療用針 Download PDFInfo
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- WO2010100808A1 WO2010100808A1 PCT/JP2009/071624 JP2009071624W WO2010100808A1 WO 2010100808 A1 WO2010100808 A1 WO 2010100808A1 JP 2009071624 W JP2009071624 W JP 2009071624W WO 2010100808 A1 WO2010100808 A1 WO 2010100808A1
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- rhenium
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- tungsten wire
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/06—Needles ; Sutures; Needle-suture combinations; Holders or packages for needles or suture materials
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/003—Articles made for being fractured or separated into parts
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/12—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of wires
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
-
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00526—Methods of manufacturing
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00831—Material properties
-
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the present invention relates to a rhenium tungsten wire used for medical needles, a method for producing the same, and a medical needle using the same, and particularly high strength. Even when processed into a medical needle, cracks and cracks are generated.
- the present invention relates to a rhenium-tungsten wire capable of manufacturing a medical needle with a low yield and good usability with a high yield, a manufacturing method thereof, and a medical needle using the same.
- a stainless needle is generally used as a medical suturing needle, and in recent years, a need for a thinner medical needle is increasing in order to reduce the burden on a patient.
- the needle is easily bent or bent, and there is a problem that workability is deteriorated in a short time.
- a material having higher strength and rigidity than stainless steel is required.
- rhenium tungsten alloy (Re-W alloy) is a material having high strength and rigidity by solid solution strengthening of rhenium in tungsten.
- the tensile strength of the rhenium tungsten alloy wire is expressed as T (N / mm 2 ).
- the maximum value of (N / mm 2 ) was a range represented by the following formula (3) represented by a function of the wire diameter D (mm). T ⁇ 634.6 ⁇ D 2 ⁇ 7869.3 ⁇ D + 4516.3 (3)
- JP-A-7-204207 discloses a surgical medical needle made of a tungsten alloy containing rhenium (Re) in a proportion of 30% by mass or less. According to this surgical medical needle, it is reported that a high tensile elastic modulus and a high tensile yield strength can be obtained.
- the conventional rhenium tungsten wire constituting the medical needle disclosed in the above prior art document takes the maximum value in the range of the tensile strength represented by the formula (3), and (3) A rhenium tungsten wire having a tensile strength exceeding the value calculated by the equation has not been obtained, and sufficient performance has not been obtained.
- the medical needle disclosed in Patent Document 1 is cracked during the production of rhenium tungsten wire, or when performing press working or bending to form a curved suture needle from a rhenium tungsten wire.
- there is a problem that the production yield of the product is greatly reduced due to the occurrence of cracks and cracks.
- the present invention has been made in view of the above circumstances, and improves the conventional tensile strength by 1.2 to 1.4 times, improves the usability of a medical needle, and performs press working and bending. It is an object of the present invention to provide a rhenium tungsten wire that is less likely to crack during processing and less likely to crack at a bent portion, a method for manufacturing the same, and a medical needle using the rhenium tungsten wire.
- a rhenium tungsten wire according to the present invention is a rhenium tungsten wire containing 10 to 30% by mass of rhenium and comprising the remaining tungsten, and the wire diameter D is 0.10 to 0.40 mm.
- the tensile strength T (N / mm 2 ) of the rhenium tungsten wire is expressed by the following formula (1): 6314.6 ⁇ D 2 ⁇ 7869.3 ⁇ D + 4516.3 ⁇ T ⁇ 5047.4 ⁇ D 2 ⁇ 7206.4 ⁇ D + 5129.2 (1) It is within the range specified in the above.
- the method for producing a rhenium tungsten wire according to the present invention includes 70 to 90% by mass of tungsten powder having an average particle diameter D50 of 25 ⁇ m or less and an average particle diameter D90 of 60 ⁇ m or less, and a rhenium powder having an average particle diameter D50 of 45 ⁇ m or less.
- a wire drawing process for drawing the rolled sintered body into a wire, and an electropolishing process for electrolytic polishing the surface of the wire.
- the rhenium tungsten wire and the manufacturing method thereof according to the present invention it is possible to improve the tensile strength of the wire by 1.2 to 1.4 times that of the conventional wire.
- the usability of the medical needle can be improved, and a rhenium-tungsten wire that does not easily crack or break during the pressing or bending of the wire is obtained.
- the wire It is possible to provide a medical needle that is easy to use.
- the rhenium tungsten wire according to the embodiment of the present invention is composed of 10 to 30% by weight of rhenium and the balance tungsten, the wire diameter D is 0.10 to 0.40 mm, and the tensile strength T (N / mm 2 ) Is within a range defined by the following equation (1), which is a relational expression with the wire diameter D (mm). 6314.6 ⁇ D 2 ⁇ 7869.3 ⁇ D + 4516.3 ⁇ T ⁇ 5047.4 ⁇ D 2 ⁇ 7206.4 ⁇ D + 5129.2 (1)
- the wire diameter D is 0.10 mm ⁇ D ⁇ 0.40 mm.
- the tensile strength T is 3792.5 to 4459.0 (N / mm 2 ), and when the wire diameter D is 0.40 mm, the tensile strength is T is 2378.9 to 3054.2 (N / mm 2 ). That is, the values of the wire diameter D and the tensile strength T of the rhenium tungsten wire according to this embodiment are within the range of the region A shown in FIG.
- the rhenium content is defined as 10 to 30% by mass, more preferably 24 to 27% by mass.
- the Re—W wire may contain impurities due to raw materials and processes.
- the rhenium content is within the above range, it is possible to suppress the occurrence of cracks and disconnections during plastic working and wire drawing.
- the rhenium content is less than 10% by mass, cracks are likely to occur along the fiber structure of the wire formed during wire drawing when the wire is plastically processed into a flat shape.
- the rhenium content exceeds 30% by mass, a hard ⁇ phase is generated in a portion where the rhenium is excessive in the structure, which causes cracks and breaks during wire drawing.
- the tensile strength T (N / mm 2 ) of the rhenium tungsten wire according to the embodiment of the present invention is less than the value indicated by 6314.6 ⁇ D 2 -7869.3 ⁇ D + 4516.3 in the wire diameter D Since the structural strength is insufficient, the required characteristics such as medical needles cannot be satisfied.
- the tensile strength T exceeds 5047.4 ⁇ D 2 ⁇ 7206.4 ⁇ D + 5129.2
- the hardness of the wire becomes excessive, so that the deformation resistance in the wire drawing process increases, and the wire breaks during processing. And surface defects and variations in wire diameter are likely to occur.
- the load on the manufacturing equipment such as increased wear of the wire drawing die and cracking of the wire drawing die becomes excessive, and it is difficult to ensure stable quality.
- the total amount of Fe, Mo, Si, Mg, Al, and Ca as impurities is 200 ppm or less, preferably 100 ppm or less, and more preferably 70 ppm or less.
- These elements, which are inevitable impurities, are contained due to the influence of the raw material or the manufacturing process, but because the content is within the above range, the bendability of the rhenium tungsten wire is improved, and bending and pressing are not performed. It becomes easy.
- the method for producing a rhenium tungsten wire according to the present invention comprises 70 to 90% by mass of tungsten powder having an average particle size D50 of 25 ⁇ m or less and an average particle size D90 of 60 ⁇ m or less, and a rhenium powder 10 to 10% having an average particle size D50 of 45 ⁇ m or less.
- a rolling process for rolling the sintered body, a recrystallization process for recrystallizing the rolled sintered body, a rolling process for further rolling the recrystallized sintered body It comprises a wire drawing step of drawing the sintered body into a wire by wire drawing and an electropolishing step of electropolishing the surface of the wire.
- the manufacturing process of the rhenium tungsten wire includes, for example, a mixing process of mixing tungsten powder having a predetermined particle diameter and rhenium powder as raw materials, and a forming process of forming the obtained raw material mixture, A pre-sintering step of pre-sintering the formed body, a main-sintering step of main-sintering the pre-sintered body, a first rolling-up process of rolling the obtained sintered body, An annealing process for heat-treating the sintered body, a rolling process for rolling the sintered body after the heat treatment, a second rolling process for rolling the rolled sintered body, A recrystallization step for crystallizing, a third rolling step for further rolling the recrystallized sintered body, a wire drawing step for drawing the rolled sintered body into a wire, An electropolishing step of electropolishing the surface of the wire.
- the average particle size is 70 to 90% by mass of tungsten powder having an average particle size D50 of 25 ⁇ m or less and an average particle size D90 of 60 ⁇ m or less.
- a rhenium powder having a D50 of 45 ⁇ m or less is mixed with 10 to 30% by mass.
- the average particle diameter D50 of the tungsten powder By defining the average particle diameter D50 of the tungsten powder to 25 ⁇ m or less and D90 to 60 ⁇ m or less, uniform mixing of the tungsten powder and the rhenium powder proceeds sufficiently, and variation in the rhenium concentration in the rhenium tungsten wire is reduced. Is possible.
- the average particle diameter D50 of the tungsten powder is more preferably in the range of 10 ⁇ m to 20 ⁇ m.
- the average particle diameter D90 is more preferably 50 ⁇ m or less.
- the average particle diameter D50 of the rhenium powder is preferably 10 to 20 ⁇ m.
- the average particle diameter D50 of the rhenium powder exceeds 45 ⁇ m, the ductility of the rhenium tungsten wire is lowered, and when press working or bending for manufacturing a secondary processed product is performed, Folding may occur.
- the content of impurities other than rhenium in the tungsten powder is preferably 200 ppm or less, more preferably 100 ppm or less.
- the content of the impurities exceeds 200 ppm, the ductility of the rhenium tungsten wire is lowered. Therefore, there is a high possibility that cracks and breaks will occur in the rhenium tungsten wire when performing press working and bending to produce a secondary processed product from the rhenium tungsten wire.
- iron (Fe) is less than 50 ppm
- molybdenum (Mo) is less than 30 ppm
- oxygen (O) is less than 0.2 wt%
- potassium (K) is 5 ppm or less. If so, the ductility of the rhenium tungsten wire is increased. Therefore, it is possible to reduce cracks and breaks that occur in the rhenium tungsten wire when performing press working and bending for producing a secondary processed product from the rhenium tungsten wire.
- the raw material mixture prepared in the mixing step is pressed with a die press molding machine or the like. To obtain a rod-like shaped body.
- this molding step it is preferable to carry out the pressing and compacting operation so that the relative density of the molded body is in the range of 45 to 50%.
- a pre-sintering treatment may be performed on the molded body obtained in the molding process in advance in order to facilitate handling in the main sintering process, which is a subsequent process.
- the preliminary sintering step for example, in a continuous hydrogen furnace having a temperature of 1300 to 1400 ° C., the compact is inserted and heated at a feed rate of 4.5 to 5.0 cm / min (heating time 20 minutes to 1 hour). Perform the operation.
- the temporary sintering body is subjected to a main sintering step for obtaining the main sintered body by, for example, electric current sintering.
- the main sintering step for example, current sintering of the temporary sintered body is performed in a bell jar in a hydrogen stream.
- the sintering temperature is preferably in the range of 2800 to 3100 ° C., and the sintering time is preferably 60 to 90 minutes.
- the sintering current is 3700 to 4000A. When the sintering current is less than 3700 A, the sintering temperature is low, and therefore, rhenium does not diffuse and a uniform solid solution state cannot be obtained, which is not preferable.
- the relative density of the sintered body after completion of the main sintering step is preferably 95% or more, and more preferably 98% or more.
- the density is preferably 19.1 to 19.6 g / cm 3 (corresponding to a relative density of 96.86 to 99.39%).
- the relative density of the sintered body is within the above range, it is possible to reduce cracking, chipping, breakage, etc. in the subsequent rolling process (swaging).
- the first rolling process is performed on the rhenium tungsten ingot obtained in the main sintering step to obtain a rhenium tungsten material such as a bar.
- the first rolling process is preferably carried out under heating at a temperature of 1300 to 1500 ° C.
- an annealing process is performed on the rhenium tungsten material obtained in the rolling process.
- the annealing step can be performed, for example, by energization annealing under a processing condition in which the temperature is 1500 to 1600 ° C. and the processing time is 1 to 5 minutes in a hydrogen atmosphere.
- the current during this energization process is, for example, 2700 to 3100A.
- a rolling process is performed on the rhenium tungsten material obtained in the annealing process.
- the rolling step is preferably performed under heating at a temperature of 1350 to 1550 ° C.
- a second rolling process is performed on the rhenium tungsten material subjected to the rolling process.
- the second rolling process is preferably carried out under heating in the temperature range of 1300-1500 ° C.
- a predetermined heat treatment is then performed and a recrystallization treatment is performed.
- the recrystallization treatment can be performed by, for example, high-frequency heating using a high-frequency heating device.
- the treatment temperature can be 2300 to 2600 ° C., preferably in the range of 2400 to 2500 ° C.
- the recrystallization treatment is performed until the crystal grain size in the cross section cut perpendicularly to the length direction of the rhenium tungsten material is in the range of 10 to 100 ⁇ m.
- the size of the crystal grain size is preferably 10 to 50 ⁇ m, more preferably 20 to 50 ⁇ m. If the crystal grain size of the rhenium tungsten material is within the above range, the tensile strength of the rhenium tungsten material can be properly maintained, and microcracks are unlikely to occur in the structure. In this case, the rhenium tungsten wire can be prevented from being broken or cracked. On the other hand, if the crystal grain size is less than 10 ⁇ m, it is not preferable because the wire drawing performed on the wire after the recrystallization treatment becomes difficult.
- the wire diameter at the time of performing the recrystallization treatment is preferably 4 to 8 mm, more preferably 5 to 7 mm. is there.
- the recrystallization treatment is performed with a wire diameter of less than 4 mm, the residual stress of the crystal is large, so that the crystal grain size becomes coarse and the strength of the wire is reduced, which is not preferable.
- it is carried out in the stage of a thick line exceeding 8 mm in diameter it is necessary to carry out a lot of processing for obtaining a wire diameter of 0.10 to 0.40 mm, which is the object of the present invention. Not preferable.
- the total area reduction ratio Rd (%) in the processing step including the third rolling step and the wire drawing is preferably in the range represented by the following formula (2).
- D satisfies the relational expression: 0.10 mm ⁇ D ⁇ 0.40 mm
- Rd is the total area reduction (%)
- D is the diameter (mm) of the wire.
- the total area reduction rate Rd is preferably 99.96% or more.
- the total area reduction rate Rd is 99.36% or more. preferable.
- This third rolling step is preferably carried out under heating at a temperature of 1300 to 1500 ° C. so that the area reduction rate per pass is 12 to 18%.
- a wire drawing process is next performed on the rhenium tungsten material subjected to the third rolling process.
- the wire drawing step is preferably performed until the cross-sectional area of the rhenium tungsten material becomes 95% or more in terms of the total area reduction with respect to the cross-sectional area when the wire drawing process is started. Furthermore, this total area reduction is preferably 97% or more.
- the area reduction rate indicates a reduction rate of the cross-sectional area of the material before and after the process. For example, when the cross-sectional area before the wire drawing process is 100 and the cross-sectional area after the wire drawing process is 25, the area reduction rate is 75%.
- the total area reduction rate indicates the reduction rate of the cross-sectional area before and after wire drawing through all wire drawing.
- the area reduction rate per machining pass is adjusted according to the degree of total area reduction.
- the total area reduction ratio in the rolling process is 0% or more and less than 86%
- the area reduction ratio per machining pass is 28 to 37%
- the total area reduction ratio in the wire drawing process performed after the rolling process is
- the ratio is 86% or more and less than 97%
- the area reduction rate per machining pass is 20-30%
- the total area reduction rate is 97% or more
- the area reduction rate per machining pass is 17-25%.
- Adjust the area reduction ratio to The wire drawing step is preferably carried out under heating in the temperature range of 800 ° C to 1100 ° C.
- electropolishing is performed on the rhenium tungsten wire subjected to strainer processing or the like in order to remove the drawing lubricant adhering to the surface and the oxide layer generated on the surface.
- the electrolytic polishing process is performed by, for example, electrochemically polishing the surface of the metal wire in an aqueous sodium hydroxide solution having a concentration of 7 to 15% by mass.
- the rhenium tungsten wire according to the embodiment of the present invention can improve the tensile strength by 1.2 to 1.4 times that of the conventional one, and the cracks and cracks generated during pressing and bending are greatly reduced. Since it is reduced, it becomes possible to perform processing into a curved shape with a high yield, and it can be suitably used for a secondary processed product processed into a bent shape such as a medical needle.
- the bendability of the rhenium tungsten wire manufactured as described above can be evaluated using a bending test apparatus 20 as shown in FIG.
- the bending test apparatus 20 includes a pair of first chuck member 21 and second chuck member 22 that sandwich and fix the rhenium tungsten wire 11.
- the specific evaluation method is as follows. That is, the rhenium tungsten wire 11 having a wire diameter D of 0.10 to 0.40 mm is sandwiched and fixed between the first chuck member 21 and the second chuck member 22, and the curved surface portion 23 having a curvature radius of 0.3 mm from the straight state.
- a first step S1 that is bent at a bending angle of approximately 90 degrees along a second step S2 and a second step S2 that returns the bent state to the linear state are alternately repeated, and includes the first step and the second step. This is carried out by counting the number of reciprocating bendings as one and counting the total number of bendings until a crack occurs.
- a medical needle can be manufactured by subjecting the rhenium tungsten wire prepared through the above-described steps to tip processing by strainer processing, cutting, and mechanical polishing. Moreover, in addition to the said process, press work and a melt process may be performed.
- the rhenium tungsten wire according to the embodiment of the present invention can be cut and processed to be used for a medical needle.
- the rhenium tungsten wire according to the present invention has a high tensile strength and good bendability, and therefore is suitably used for a medical needle.
- the cross-sectional shape of the medical needle is processed into a shape corresponding to the application such as a circle, an ellipse, a triangle, a trapezoid, a rectangle, and a hexagon.
- the tip shape may be processed so as to be thin, or is selected according to the use such as a round shape or a shape in which a sharp portion is formed by a cutting edge.
- the shape of the needle a shape according to the application such as a linear shape or a curved shape is selected, but the curved shape is preferably adopted.
- the needle portion (tip portion) has a length of, for example, about 1/4 to 3/4 of the circumferential length (full length).
- a means for hooking the suture thread on the opposite side of the tip of the needle may be provided.
- Example 1 74 parts by weight of tungsten powder having an average particle diameter D50 of 20 ⁇ m and D90 of 50 ⁇ m and 26 parts by weight of rhenium powder having an average particle diameter D50 of 20 ⁇ m were mixed by a ball mill to prepare a raw material mixed powder.
- the impurity concentration of the tungsten powder Fe was less than 50 ppm, Mo was less than 20 ppm, O was less than 0.1 wt%, and K was 5 ppm or less.
- a molded body having a molding density of 9.3 g / cm 3 (relative density 47.16%) was molded using a mold press molding machine.
- the obtained compact was pre-sintered using a continuous hydrogen furnace under the conditions of a processing temperature of 1350 ° C. and a feed rate of 4.5 to 5.0 cm / min. Further, in a bell jar in a hydrogen stream, current sintering was performed under conditions of a sintering current of 3950A and a sintering time of 75 minutes, to obtain a rhenium tungsten ingot having a density of 19.1 g / cm 3 (relative density 96.86%). It was.
- the rhenium tungsten ingot was subjected to a rolling process (swaging) at a temperature of 1400 ° C. and processed into a rod having a diameter of 12.0 mm, and then the current was 2900 A in a hydrogen atmosphere and the energization time was 2 minutes. An electrical annealing treatment was performed. Further, after rolling at a temperature of 1400 ° C., the rolling process was repeated at a temperature of 1400 ° C. to obtain a rhenium tungsten rod having a diameter of 6.0 mm.
- the rhenium tungsten rod was recrystallized by heating to a temperature of 2400 ° C. with a high-frequency heating device, and a rhenium tungsten rod with a crystal grain size in the range of 20 to 50 ⁇ m was obtained.
- the rhenium tungsten rod after the recrystallization treatment is then subjected to a rolling process at a temperature of 1400 ° C. and a surface area reduction rate of 12 to 18% per pass to obtain a rhenium having a diameter of 2.2 mm.
- a tungsten rod was obtained.
- the rhenium tungsten rod was subjected to wire drawing at a temperature of 800 to 900 ° C. several times until the total area reduction ratio reached 98.7% to obtain a rhenium tungsten wire having a diameter of 0.22 mm.
- the area reduction rate per pass of the wire drawing process is 28 to 37%.
- the area reduction rate per pass of wire drawing is adjusted to 20 to 30%, and the total area reduction rate is 97%.
- the area reduction rate was adjusted so that the area reduction rate per pass of wire drawing was 17-25%.
- the obtained rhenium tungsten wire is subjected to strainer processing, and then subjected to electrolytic polishing on the surface of the wire in an aqueous sodium hydroxide solution having a concentration of 7 to 15%. By removing the oxide layer formed on the surface, a rhenium tungsten wire having a diameter of 0.2 mm was obtained.
- the rhenium tungsten wire after the electropolishing treatment had a tensile strength of 3510 N / mm 2 .
- the tensile strength was about 1.28 times that of the conventional material.
- the tensile strength of the rhenium tungsten wire according to Example 1 belongs to the region A indicating the example in the graph showing the relationship between the wire diameter D and the tensile strength T shown in FIG. Further, when the bending test shown in FIG. 2 was performed on the rhenium tungsten wire after the above-described electropolishing treatment, the number of bendings until a crack was generated averaged 15.4 times, minimum 13 times, and maximum 19 times. Bendability (durability) was shown.
- a linear needle was prepared through strainer processing, cutting, and tip processing by mechanical polishing using the rhenium tungsten wire prepared in this example.
- a rotary strainer processing machine was used, and the string height per 100 mm was set within 10 mm by the circular string method.
- the cutting was performed using a grindstone cutting machine so as to have a length of 50 mm.
- the tip of the pin was pressed against the rotating grindstone so as to be 45 °, and the tip was opened so that the opening angle was 45 °.
- the upper 10 mm of the needle manufactured as described above was clamped to the apparatus, and the pork was stabbed 50 times to a depth of 30 mm per piece, and the amount of bending of the needle after piercing 50 times was measured.
- the amount of bending of the needle was measured as the maximum displacement of the needle with respect to a 40 mm long straight line.
- the amount of bending of the needle from the tip to 40 mm was 1.8 mm on average.
- Example 2 A rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 except that the mixing ratio of the rhenium powder was 10 parts by weight. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, it was confirmed that cracks were reduced with a higher tensile strength than the conventional material in the region A shown in FIG.
- Example 3 A rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 except that the mixing ratio of the rhenium powder was 30 parts by weight. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, the tensile strength was higher than that of the conventional material, and it was confirmed that cracks were reduced.
- Example 4 In the production process of Example 1, a rhenium tungsten wire having a wire diameter of 0.2 mm was produced through the same production process as Example 1 except that a powder having an average particle diameter D50 of 50 ⁇ m was used as the rhenium powder. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. The rhenium tungsten wire manufactured according to this example had good tensile strength, but breakage occurred locally and there was a problem in workability.
- Example 5 A rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 using tungsten powder having a total impurity amount of 500 ppm or more. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. The rhenium tungsten wire manufactured according to this example had a variation in value although the tensile strength was in a favorable range (A region in FIG. 1).
- Example 6 In the production process of Example 1, a rhenium tungsten wire having a wire diameter of 0.1 mm was produced by setting the diameter of the rhenium tungsten rod for high-frequency annealing to 7.0 mm. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, it was confirmed that it has a higher tensile strength (in the region A in FIG. 1) than the conventional material, and cracks are reduced.
- Example 7 In the manufacturing process of Example 1, a rhenium tungsten wire having a diameter of 0.1 mm was manufactured by setting the diameter of a rhenium tungsten rod for high-frequency annealing to 5.1 mm. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, it was confirmed that it has a higher tensile strength (in the region A in FIG. 1) than the conventional material, and cracks are reduced.
- Example 8 In the manufacturing process of Example 1, a rhenium tungsten wire having a diameter of 0.4 mm was manufactured by setting the diameter of the rhenium tungsten rod for high-frequency annealing to 7.0 mm. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, it was confirmed that it has a higher tensile strength (in the region A in FIG. 1) than the conventional material, and cracks are reduced.
- Example 9 In the manufacturing process of Example 1, the diameter of the rhenium tungsten rod for high-frequency annealing was 5.1 mm, and a rhenium tungsten wire having a wire diameter of 0.4 mm was manufactured. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, it was confirmed that it has a higher tensile strength (in the region A in FIG. 1) than the conventional material, and cracks are reduced.
- Example 10 In the manufacturing process of Example 1, a rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 except that high-frequency annealing was performed at a temperature of 2300 ° C. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, it was confirmed that it has a higher tensile strength (in the region A in FIG. 1) than the conventional material, and cracks are reduced.
- Example 11 In the manufacturing process of Example 1, a rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 except that high-frequency annealing was performed at 2600 ° C. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. As a result, it was confirmed that it has a higher tensile strength (in the region A in FIG. 1) than the conventional material, and cracks are reduced.
- Example 1 In the manufacturing process of Example 1, a rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 except that the mixing ratio of the rhenium powder was set to 3 parts by weight. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.
- the tensile strength of the rhenium tungsten wire according to Comparative Example 1 is 3070 N / mm 2 , and belongs to the region B showing the conventional example in the graph showing the relationship between the wire diameter D and the tensile strength T shown in FIG. It is.
- Example 2 In the manufacturing process of Example 1, a rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 except that the mixing ratio of the rhenium powder was excessively 35 parts by weight. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1. In the rhenium tungsten wire according to the comparative example 2, since an abnormal structure was formed, disconnection occurred, and subsequent processing was impossible.
- Comparative Example 3 74 parts by weight of tungsten powder having an average particle diameter D50 of 30 ⁇ m and D90 of 50 ⁇ m and 26 parts by weight of rhenium powder having an average particle diameter D50 of 20 ⁇ m were mixed by a ball mill to prepare a mixed powder.
- the impurity concentration of the tungsten powder was Fe: less than 50 ppm, Mo: less than 20 ppm, O: less than 0.1 wt%, and K: 5 ppm or less.
- the mixed powder was molded into a molded body having a molding density of 9.3 g / cm 3 using a mold press molding machine.
- the obtained compact was pre-sintered using a continuous hydrogen furnace at a processing temperature of 1350 ° C. and a feed rate of 4.5 to 5.0 cm / min. Further, current sintering was performed in a hydrogen gas bell jar under the conditions of a sintering current of 3650 A and a sintering time of 50 minutes to obtain a rhenium tungsten ingot having a density of 19.1 g / cm 3 .
- the rhenium tungsten ingot was subjected to a rolling process (swaging) at 1400 ° C. to be processed into a bar having a diameter of 12.0 mm, and then subjected to energization annealing at 2900 A for 2 minutes in a hydrogen atmosphere. Further, after rolling at 1400 ° C., the rolling process was repeated at 1400 ° C. to obtain a rhenium tungsten rod having a diameter of 4.0 mm.
- the rhenium tungsten rod was heated to 2600 ° C. by a high-frequency heating device and recrystallized to obtain a rhenium tungsten rod having a crystal grain size in the range of 40 to 80 ⁇ m.
- the rhenium tungsten rod after the recrystallization treatment was subjected to the same processing steps as in Example 1 to obtain a rhenium tungsten wire having a diameter of 0.2 mm.
- the obtained rhenium tungsten wire was evaluated in the same manner as in Example 1.
- the tensile strength is 2740 N / mm 2 , and this value belongs to the region B showing the conventional example in the graph showing the relationship between the wire diameter D and the tensile strength T shown in FIG.
- the average was 10.4 times, a minimum of 7 times, and a maximum of 13 times.
- the average value of the bending amount was 5.7 mm.
- the evaluation results are shown in Table 1.
- Example 4 (Comparative Example 4) In the manufacturing process of Example 1, a rhenium tungsten wire having a wire diameter of 0.1 mm is manufactured through the same manufacturing process as in Example 1 except that the diameter of the rhenium tungsten rod for high-frequency annealing is set to 4.0 mm. did. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.
- Example 5 (Comparative Example 5) In the manufacturing process of Example 1, a rhenium tungsten wire having a wire diameter of 0.4 mm is manufactured through the same manufacturing process as in Example 1 except that the diameter of the rhenium tungsten rod for performing high-frequency annealing is set to 4.0 mm. did. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.
- Example 6 (Comparative Example 6) In the manufacturing process of Example 1, a rhenium tungsten wire having a wire diameter of 0.2 mm was manufactured through the same manufacturing process as in Example 1 except that high-frequency annealing was performed at 2700 ° C. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.
- Example 7 Through a manufacturing process similar to the manufacturing process of Example 1, a rhenium tungsten wire having a final wire diameter of 0.05 mm was manufactured. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.
- Example 8 A rhenium tungsten wire having a final wire diameter of 0.45 mm was manufactured through a manufacturing process similar to the manufacturing process of Example 1. The obtained rhenium tungsten wire was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.
- the present invention provides a wire rod that has a high tensile strength and is less likely to break due to bending even with a thin wire diameter, and can be suitably used particularly for a medical needle.
Abstract
Description
T<6314.6×D2-7869.3×D+4516.3 …… (3)
本発明は、上記事情に鑑みてなされたものであり、従来の引張強さを1.2~1.4倍に向上させ、医療用針の使い勝手を向上させるとともに、プレス加工や曲げ加工の際に、クラックが発生しにくく、折り曲げ部分に割れが発生しにくいレニウムタングステン線とその製造方法、およびこのレニウムタングステン線を用いた医療用針を提供することを目的とする。
6314.6×D2-7869.3×D+4516.3≦T≦ 5047.4×D2-7206.4×D+5129.2 ……(1)
で規定された範囲内にあることを特徴とする。
本発明の実施形態に係るレニウムタングステン線は、10~30重量%のレニウムと残部タングステンとから成り、線径Dが0.10~0.40mmであり、その引張強さT(N/mm2)が、線径D(mm)との関係式である下記(1)式で規定された範囲内にあることを特徴とする。
6314.6×D2-7869.3×D+4516.3≦T
≦5047.4×D2-7206.4×D+5129.2 ……(1)
ここで、線径Dは0.10mm≦D≦0.40mmである。
具体的には、線径Dが0.10mmのとき、引張強さTは3792.5~4459.0(N/mm2)であり、線径Dが0.40mmのときは、引張強さTは2378.9~3054.2(N/mm2)となる。すなわち、本実施形態に係るレニウムタングステン線の線径Dおよび引張強さTの値は、図1に示す領域Aの範囲内に存在する。
Rd≧-0.04×D2+2×10-13×D+1 ……(2)
但し、Dは関係式:0.10mm≦D≦0.40mmを満足し、Rdは総減面率(%)であり、Dは線材の直径(mm)である。
例えばDが0.10mmのとき、総減面率Rdは99.96%以上であることが好ましく、一方Dが0.40mmのとき、総減面率Rdは99.36%以上であることが好ましい。この第3の転打工程は、温度1300~1500℃の加熱下で行い、1パス当りの減面率が12~18%となるように実施することが好ましい。
ここで減面率とは、工程前後における素材の断面積の減少率を示す。例えば、伸線加工工程前の断面積が100で、伸線加工後の断面積が25の場合、減面率は75%となる。総減面率とは、全ての伸線加工を通しての伸線加工前後における断面積の減少率を示す。
具体的な評価方法は、下記の通りである。すなわち、線径Dが0.10~0.40mmであるレニウムタングステン線11を、第1チャック部材21および第2チャック部材22で挟み込んで固定し、直線状態から曲率半径0.3mmの曲面部23に沿って、略90度の屈曲角度で屈曲させる第1工程S1と、この屈曲した状態を前記の直線状態に戻す第2工程S2とを交互に繰り返し、第1工程および第2工程から成る1往復の折り曲げ回数を1回と数え、クラックが生じるまでの合計折り曲げ回数をカウントすることにより実施する。
平均粒径D50が20μm、D90が50μmであるタングステン粉末74重量部と、平均粒径D50が20μmのレニウム粉末26重量部とをボールミルで混合して、原料混合粉末を調製した。タングステン粉末の不純物濃度は、Feが50ppm未満であり、Moが20ppm未満であり、Oが0.1重量%未満であり、Kが5ppm以下であった。
次に得られた成形体を、連続水素炉を使用して、処理温度が1350℃であり、送り速度が4.5~5.0cm/minである条件で、仮焼結処理を実施した。さらに、水素気流中ベルジャー内において、焼結電流3950A、焼結時間75分の条件で通電焼結を行い、密度が19.1g/cm3(相対密度96.86%)のレニウムタングステンインゴットを得た。
この再結晶化処理後のレニウムタングステン棒材に対し、次に温度1400℃で1パス当りの減面率が12~18%である転打加工を実施して、直径が2.2mmであるレニウムタングステン棒材を得た。
さらに上記電解研磨処理後のレニウムタングステン線について、図2に示すベンディング試験を行ったところ、クラックが発生するまでの折り曲げ回数は平均15.4回、最小13回、最大19回であり、良好な折り曲げ性(耐久性)を示した。
上記突き刺し試験を各10本の針について実施した結果、先端から40mmまでの針の曲がり量が平均で1.8mmであった。
レニウム粉末の混合比率を10重量部とした以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、図1で示す領域A内にある、従来材より高い引張強さを有し、クラックが低減されたことが確認できた。
レニウム粉末の混合比率を30重量部とした以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、従来材より高い引張強さを有し、クラックが低減されたことが確認できた。
実施例1の製造工程において、レニウム粉末に平均粒径D50が50μmである粉末を用いる以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。本実施例により製造されたレニウムタングステン線は、引張強さは良好であったが、局部的に断線が発生し、加工性に問題があった。
タングステン粉末の総不純物量が500ppm以上であるタングステン粉末を使用して、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について実施例1と同様の評価を行った。評価結果を表1に示す。本実施例により製造されたレニウムタングステン線は、引張強さは良好な範囲(図1のA領域)に入ったものの、値にばらつきが生じた。
実施例1の製造工程において、高周波アニールを実施するレニウムタングステン棒の径を7.0mmとして、線径0.1mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、従来材より高い引張強さ(図1のA領域内)を有し、クラックが低減されることが確認された。
実施例1の製造工程において、高周波アニールを実施するレニウムタングステン棒の径を5.1mmとして、線径0.1mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、従来材より高い引張強さ(図1のA領域内)を有し、クラックが低減されることが確認された。
実施例1の製造工程において、高周波アニールを実施するレニウムタングステン棒の径を7.0mmとして、線径0.4mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、従来材より高い引張強さ(図1のA領域内)を有し、クラックが低減されることが確認された。
実施例1の製造工程において、高周波アニールを実施するレニウムタングステン棒の径を5.1mmとして、線径0.4mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、従来材より高い引張強さ(図1のA領域内)を有し、クラックが低減されることが確認された。
実施例1の製造工程において、高周波アニールを温度2300℃で実施する以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、従来材より高い引張強さ(図1のA領域内)を有し、クラックが低減されることが確認された。
実施例1の製造工程において、高周波アニールを2600℃で実施する以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。その結果、従来材より高い引張強さ(図1のA領域内)を有し、クラックが低減されることが確認された。
実施例1の製造工程において、レニウム粉末の混合比率を過少に3重量部とした以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。
この比較例1に係るレニウムタングステン線の引張強さは、3070N/mm2であり、図1に示す線径Dと引張強さTとの関係を示すグラフにおいて従来例を示す領域Bに属するものである。
実施例1の製造工程において、レニウム粉末の混合比率を過大に35重量部とした以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。
この比較例2に係るレニウムタングステン線では、異常組織が形成されたために断線が生じ、その後の加工が不可能であった。
平均粒径D50が30μmでD90が50μmであるタングステン粉末74重量部と、平均粒径D50が20μmのレニウム粉末26重量部とをボールミルで混合して、混合粉末を調整した。タングステン粉末の不純物濃度は、Fe:50ppm未満、Mo:20ppm未満、O:0.1重量%未満、K:5ppm以下であった。
この混合粉末を、金型プレス成形機を用いて、成形密度が9.3g/cm3の成形体を成形した。
このレニウムタングステンインゴットに対し、1400℃で転打加工(スウェージング)を行い、直径12.0mmの棒材に加工した後、水素雰囲気中で2900A、2分間の条件で通電アニールを行った。さらに、1400℃で圧延加工を行った後、1400℃で転打加工を繰り返して、直径4.0mmのレニウムタングステン棒材を得た。
実施例1の製造工程において、高周波アニールを実施するレニウムタングステン棒の径を4.0mmとすること以外は、実施例1と同様の製造工程を経て、線径0.1mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について実施例1と同様の評価を行った。評価結果を表1に示す。
実施例1の製造工程において、高周波アニールを実施するレニウムタングステン棒の径を4.0mmとした点以外は、実施例1と同様の製造工程を経て、線径0.4mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について実施例1と同様の評価を行った。評価結果を表1に示す。
実施例1の製造工程において、高周波アニールを2700℃で実施する以外は、実施例1と同様の製造工程を経て、線径0.2mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。
実施例1の製造工程と同様の製造工程を経て、最終の線径が0.05mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。
実施例1の製造工程と同様の製造工程を経て、最終の線径が0.45mmのレニウムタングステン線を製造した。得られたレニウムタングステン線について、実施例1と同様の評価を行った。評価結果を表1に示す。
Claims (7)
- レニウムを10~30質量%含有し残部タングステンから成るレニウムタングステン線において、線径Dが0.10~0.40mmであり、上記レニウムタングステン線の引張強さT(N/mm2)が下記(1)式:
6314.6×D2-7869.3×D+4516.3≦T≦ 5047.4×D2-7206.4×D+5129.2 ……(1)
で規定された範囲内にあることを特徴とするレニウムタングステン線。 - 請求項1記載のレニウムタングステン線において、不純物としてのFe、Mo、Si、Mg、Al、Caの総含有量が200ppm以下であることを特徴とするレニウムタングステン線。
- 請求項1または請求項2記載のレニウムタングステン線において、レニウムタングステン線が医療用針の構成材であることを特徴とするレニウムタングステン線。
- 平均粒径D50が25μm以下かつ平均粒径D90が60μm以下であるタングステン粉末70~90質量%と、平均粒径D50が45μm以下のレニウム粉末10~30質量%とを混合する混合工程と、得られた原料混合体を成形する成形工程と、この成形体を焼結する焼結工程と、得られた焼結体を圧延する圧延工程と、圧延した焼結体を転打加工する転打工程と、転打した焼結体を再結晶化させる再結晶化工程と、再結晶化した焼結体をさらに転打加工する転打加工工程と、転打した焼結体を伸線加工して線材とする伸線加工工程と、線材表面を電解研磨する電解研磨工程と、を具備することを特徴とするレニウムタングステン線の製造方法。
- 請求項4記載のレニウムタングステン線の製造方法において、前記タングステン粉末およびレニウム粉末の不純物の含有量が合計で200ppm以下であることを特徴とするレニウムタングステン線の製造方法。
- 請求項4記載のレニウムタングステン線の製造方法において、前記再結晶化工程を温度2300~2600℃で実施すると共に、かつ再結晶化工程後に実施する転打加工工程および伸線加工工程における総減面率Rd(%)が下記(2)式:
Rd≧-0.04×D2+2×10-13×D+1 ……(2)
(但し、Rdは総減面率(%)であり、Dは線径(mm)であり、関係式0.10mm≦D≦0.40mmを満足する)で表されることを特徴とするレニウムタングステン線の製造方法。 - 請求項1ないし請求項3のいずれか1項記載のレニウムタングステン線を加工して製造されることを特徴とする医療用針。
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WO2022191026A1 (ja) * | 2021-03-09 | 2022-09-15 | 株式会社 東芝 | レニウムタングステン線棒およびそれを用いた熱電対 |
WO2022230455A1 (ja) * | 2021-04-27 | 2022-11-03 | 株式会社 東芝 | タングステン線およびそれを用いたタングステン線加工方法並びに電解線 |
JP7241294B2 (ja) | 2017-05-10 | 2023-03-17 | パナソニックIpマネジメント株式会社 | ソーワイヤー及び切断装置 |
WO2024004632A1 (ja) * | 2022-07-01 | 2024-01-04 | パナソニックIpマネジメント株式会社 | タングステン線及び繊維製品 |
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JP2022001660A (ja) * | 2020-06-19 | 2022-01-06 | パナソニックIpマネジメント株式会社 | タングステン線、ソーワイヤー及びスクリーン印刷用タングステン線 |
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