JP2013064176A - Titanium cutting tool material, titanium cutting tool, and method of manufacturing them - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a cutting tool that can cut not only soft food materials but also hard food materials, is sharp, can maintain sharpness for a long time, is tough, is resistant to corrosion, and is inexpensive.SOLUTION: A titanium cutting tool is obtained by: filling a MA material, obtained by mixing titanium powder and silicon carbide powder and subjecting the mixture to mechanical alloying (MA) processing, into a case formed with a titanium plate and sealing the MA material; hot-rolling it to make a titanium cutting tool material; and blade-sharpening it by grinding after a titanium powder cutting tool material (MA material) that composes the titanium cutting tool material is sintered, wherein the titanium powder cutting tool material composed of the MA material has titanium-side plates by the titanium plate arranged on both sides of the titanium powder cutting tool material.

Description

  The present invention relates to a titanium blade material based on titanium powder, a titanium blade, and a method for manufacturing the same.

  It is desired that the blade has a good sharpness, lasts for a long time, is not easily broken, is not easily bent, and is not easily rusted, and a titanium clad steel blade has been proposed.

  In order to cut the cutter well, it is desirable that the cutter steel serving as the cutting edge is as hard as possible. However, since titanium does not have a material that is so hard that it can be used for the cutting edge of a blade, a clad of titanium and stainless blade steel has been proposed.

  In recent years, titanium blades made by sintering titanium powder have been proposed. This titanium blade has a structure in which a hard powder is mixed with titanium powder and then compression-molded, sintered in a vacuum furnace at 1200 ° C. to 1300 ° C., and then ground by grinding. However, this titanium blade is not suitable for cutting hard food because it has a soft cutting edge, and is used as a blade for cutting relatively soft vegetables.

JP 2005-48276 A JP 2008-264116 A JP 2007-143958 A

Shintaro Ishiyama "Fundamental study on divertor plate model specimen made of high thermal conductive ceramics for fusion reactor", Japanese Atomic Energy Society Journal, Vol.3, No.3 (2004), p56-p65 Kunio Takekoshi “Mechanism of sharpness degradation of blades” Proceedings of Academic Lecture Meeting of the Japan Society for Abrasive Technology 2000 307-312 2000.09.12

  An object of the present invention is to realize a titanium blade material and a titanium blade for obtaining an inexpensive blade that can cut not only a soft food but also a hard food, has a good sharpness for a long time, is not easily broken, and is not easily rusted. .

  The titanium blade of the present invention is filled with a MA material obtained by mixing MA powder (mechanical alloying) by mixing titanium powder and silicon carbide powder as a hard powder into a case formed of a titanium plate and sealed. Then, this is hot-rolled to form a titanium blade material, a blade shaped body is formed using the titanium blade material, and the titanium powder blade material (MA material) constituting the blade shaped body is sintered and hardened. The titanium blade is made by grinding to form a titanium blade, and titanium side plates made of the titanium plate are arranged on both side surfaces of the titanium powder blade material made of the MA material.

  According to the present invention, a MA material obtained by mixing a relatively inexpensive and easily available silicon carbide powder as a hard powder with titanium powder and performing MA treatment is filled and sealed in a titanium plate casing, which is hot-rolled. Titanium cutlery material, using this titanium cutlery material to form a cutlery shape, sintering and grinding to make a titanium cutlery, not only soft ingredients but also hard ingredients can be cut, and good The sharpness can be maintained for a long time, and it is possible to realize an inexpensive blade material and blade that are difficult to break and rust.

It is a characteristic curve figure which shows the X-ray-diffraction measurement result of MA material. It is process drawing of titanium cutter manufacture. It is a side view of a titanium blade. FIG. 3 is a drawing-substituting photograph when a cross-sectional view of the MA material (sintered material) after hot rolling in Example 1 is observed with a structure using an optical microscope. FIG. 3 is a drawing-substituting photograph when a cross-sectional view of the MA material (sintered material) after hot rolling in Example 1 is observed with a structure using an optical microscope. FIG. 3 is a drawing-substituting photograph when a cross-sectional view of the MA material (sintered material) after hot rolling in Example 1 is observed with a structure using an optical microscope. FIG. 3 is a drawing-substituting photograph when a cross-sectional view of the MA material (sintered material) after hot rolling in Example 1 is observed with a structure using an optical microscope. It is a drawing substitute photograph when the structure of the cut section of the MA material (unsintered material) after hot rolling is observed using an optical microscope. It is a drawing substitute photograph when the structure of the cut cross section of the MA material (1100 ° C. sintered material) after hot rolling is observed using an optical microscope. It is a drawing substitute photograph when the structure of the cut section of the MA material (1150 ° C. sintered material) after hot rolling is observed using an optical microscope. It is a drawing substitute photograph when structure | tissue observation is carried out using the optical microscope for the cut cross section of MA material (1200 degreeC sintered material) after hot rolling.

  The titanium blade of the present invention is constituted by mixing MA material forming a blade part with titanium powder and hard powder (silicon carbide powder) and subjecting to MA treatment, and this MA material is formed into a casing formed of a titanium plate. Fill and seal, hot-roll it into a titanium blade material, shape this titanium blade material into a titanium blade shape and grind the titanium powder blade material (MA material part) to cut the titanium blade Or after the titanium blade material is formed into a blade shape, the titanium powder blade material constituting the titanium blade material is sintered and then ground to form a titanium blade, and the MA material It is the structure by which the titanium side plate by the said titanium plate was distribute | arranged to the both sides | surfaces of the titanium powder cutter material comprised.

  The following materials suitable for the production of the target titanium blade were selected.

  First, selection of the titanium powder and the hard powder constituting the titanium blade material is as follows.

  Titanium alloy powder (a) (Ti-64 powder) made of Tohotech Co., Ltd., which shows the characteristics as a well-balanced blade material as titanium powder, and 64 sponge powder ACA150, and sponge available from Toho Titanium Co., Ltd. Titanium powder (b) (Lot No .: T-09015008) was selected. The compositions of these titanium powders are as shown in Tables 1 and 2 (catalog values).

  Further, the silicon carbide powder used as the hard powder is mixed with 5% or 10% by volume of those having an average particle diameter of 2.5 μm to 14 μm. Specifically, silicon carbide powder manufactured by Yakushima Electric Works, Ltd., which is relatively inexpensive and has good thermal diffusivity was selected. And 4 types of 2.5 micrometers-14 micrometers were selected by the average particle diameter (catalog value) as shown in Table 3.

  Next, the MA process is performed by performing a predetermined time at a rotational speed of 80 rpm using a pot mill (diameter: φ135 mm or φ180 mm) and ceramic balls (diameter: φ25 mm and φ30 mm). Thoroughly performed. That is, silicon carbide powder (GC-4000F) as a hard powder was mixed at a volume ratio of 10% with respect to the titanium alloy powder, and executed under the conditions shown in Table 4.

  In order to confirm this MA treatment effect, X-ray diffraction measurement was performed on the powder (MA material) after the MA treatment under the conditions shown in Table 5.

  FIG. 1 is a characteristic curve diagram showing the X-ray diffraction measurement results of MA treatment e (illustration is omitted for the characteristic curves of MA treatments a to d). In this case, when the input energy to the powder is increased, the amount of strain in the crystal lattice is increased, so that the X-ray diffraction characteristic peak tends to be broad (the width of the base is widened). Therefore, when the MA treatments a to e are compared, the treatments d and e having a pot mill diameter larger than the treatments a to c have a larger input energy, and the mixed state is improved from the respective characteristic curves. Is also broad. Further, the powder of the treatment e is more homogeneously mixed and MAized by the addition treatment than the powder of the treatment d, and the characteristic peak is broad. It can be seen that e is optimal among a to e as the MA processing requirements for manufacturing the titanium blade.

  Next, a schematic manufacturing method of the titanium blade of the present invention will be described with reference to FIG.

Step S1
Titanium powder, which is a material constituting the titanium powder cutter material, was prepared. The titanium powder is titanium alloy powder (a) or sponge titanium powder (b).

Step S2
Silicon carbide powder was prepared as a hard powder.

Step S3
MA material was obtained by mixing titanium powder and hard powder and performing MA treatment (e) under predetermined MA treatment conditions. The MA material is a powder obtained by performing MA treatment by mixing 5% or 10% by volume of silicon carbide powder with respect to titanium powder.

Step S4
As a material for filling a MA material and hot-rolling and manufacturing a titanium casing which will later become a titanium side plate, a titanium plate having a thickness of 3 mm and 20 mm (a pure titanium plate (TP340) a for the titanium alloy powder (a)), Further, a titanium alloy plate (Ti-64) b) was prepared for the sponge titanium powder (b).

Step S5
A titanium case was produced using a titanium plate. Incidentally, the titanium case is a rectangular parallelepiped, and there are two types of external dimensions: a thickness of 26 mm, a width of 115 mm, a length of 150 mm, a thickness of 60 mm, a width of 225 mm, and a length of 320 mm.

Step S6
The titanium casing was filled with MA material while being pressed with a press.

Step S7
The titanium case filled with MA material was sealed by electron beam welding.

Step S8
A titanium case filled with MA material was hot-rolled. This hot rolling was performed at a heating temperature of 950 ° C. and a heating time of 60 minutes, rolled to a thickness of 10 mm, re-heated, and further hot-rolled to 2 mm to obtain a titanium blade material from which residual pores were removed. .

Step S9
The titanium blade material prepared by filling a titanium housing with MA material and hot rolling was heat-treated, and a blade-shaped body was prepared.

Step S10
A blade-shaped body made of a titanium blade material was sintered and hardened at 1100 ° C. (titanium powder) or 1200 ° C. (sponge titanium powder) to obtain a titanium powder blade material.

Step S11
The titanium powder cutter material after sintering and hardening was ground and attached to a titanium cutter 2 as shown in FIG. Incidentally, 2a is a titanium powder blade material, and 2b is a titanium side plate.

  The titanium blade 2 manufactured by such a manufacturing method did not drop off the silicon carbide powder, and showed a sharpness that was remarkably superior to conventional titanium blades. In addition, good sharpness can be sustained for a long time, and it is difficult to bend even in the bending strength test, and it is difficult to bend, and in the salt spray test for corrosion resistance evaluation, it is resistant to rust.

  Hereinafter, the production of two types of titanium blades will be described by changing the combination of titanium materials.

  A description will be given of the manufacture of a titanium cutter that uses the MA material forming the titanium powder cutter material of the titanium cutter using titanium alloy powder as the titanium powder and silicon carbide as the hard powder.

  The titanium blade manufactured in this example is manufactured by applying the above-described manufacturing method, and includes titanium alloy powder (titanium alloy powder a in step S1 described with reference to FIG. 2) and silicon carbide powder. It is set as the structure which has arrange | positioned the titanium side plate on the both sides | surfaces of the titanium powder cutter material formed using MA material (MA material a in step S3 demonstrated with reference to FIG. 2) which mixed and MA-processed. Various combinations of titanium alloy powder and silicon carbide powder were selected as shown in Table 6 to prepare titanium blade samples.

  Sample No. 1 to 4 are MA materials a, sample Nos. 5 and 5 in which silicon carbide powders having different average particle diameters are mixed with titanium alloy powders at a volume ratio of 5%. 5-8 are MA materials a in which silicon carbide powders having different average particle diameters are mixed with the titanium alloy powders at a volume ratio of 10%.

  A titanium case was produced as follows. This case is a member used for filling the MA material a, sealing it, and performing hot rolling, and later remaining on both sides of the titanium blade material to become a titanium side plate. This titanium casing was produced by Tig welding a pure titanium plate (TP340). As for the dimensions of the titanium case, the thickness of the pure titanium plate was 3 mm, and the outer dimensions of the case were 26 mm in thickness, 115 mm in width, and 150 mm in length.

  Filling and sealing the MA material with respect to the titanium case is performed by sufficiently filling the MA material obtained by processing the materials shown in Table 6 into the titanium case while pressing it with a press machine, and opening the titanium case filled with the MA material with titanium. The cover was covered with a plate, and electron beam welding was performed.

  The titanium case filled with the MA material was heat-treated at a heating temperature of 950 ° C. for 60 minutes and hot-rolled to obtain a titanium blade material.

  The titanium blade material after hot rolling was re-rolled to a thickness of 2 mm.

  A titanium blade was manufactured by forming a blade-shaped body using the titanium blade material after the heat treatment, performing a sintering hardening treatment, and then grinding the blade to produce a titanium blade. This titanium blade (titanium powder blade material) was subjected to Vickers hardness measurement, bending strength measurement, structure observation, and sharpness test.

  Table 7 shows the Vickers hardness measurement results of this titanium blade.

  As a result, although the commercially available kitchen knife has a Vickers hardness of 350 to 550, the Vickers hardness (average value) of the titanium knife after sintering in this example is 430 to 564, and there are variations. The value is close to the hardness of a general knife. In particular, sample no. 1 (MA material in which 5% of GC-4000F silicon carbide powder is mixed with titanium alloy powder), sample No. 1 In 7.8 (MA material obtained by mixing 10% of silicon carbide powder of GC-4000F or GC-1500F with titanium alloy powder), it has sufficient hardness as a kitchen knife used in a general household.

  Table 8 shows the results of the bending strength measurement.

  As a result, the hard particle SiC 5% mixed sample (Nos. 1 to 4) tends to have a larger value than the 10% mixed sample (Nos. 5 to 8). No. with small diameter The sample 1 showed the maximum value and exhibited a strong characteristic against bending.

  The titanium side plates 2b disposed on both side surfaces of the titanium powder cutter material 2a have a function of making the titanium cutter difficult to bend and bend.

  Moreover, an example of a photograph when the structure of the cut cross section of the MA material (unsintered material and sintered material after sintering) after hot rolling is observed using an optical microscope is shown in FIGS. From the observation results, sample No. In Nos. 1 to 4, no degranulation of SiC was observed. 5, no. 7-No. In all cases, SiC degranulation was observed, indicating that it was unsuitable as a blade.

  Furthermore, EPMA was measured in order to evaluate the thermal diffusivity of SiC. Here, in order to evaluate the diffusibility of the carbon particles, Sample No. 8 was used. Thereby, the carbon C of SiC diffused into the Ti alloy layer, and as a result, it was confirmed that the Ti alloy was firmly present as a harder and more stable TiC.

  Table 9 shows the measurement results of the sharpness evaluation.

  This measuring method was performed with the Honda sharpness tester (Non-Patent Document 2). The test blade was fixed, and a paper equivalent to 7.5 mm wide newspaper was piled up and a weight of about 750 g was applied, a reciprocating motion of 20 mm was performed, and a cutting operation was performed 17 times as one cutting time per reciprocation. This is a test method for evaluating the number of cut papers.

  Although variations in the measured values are observed, both the unsintered material and the sintered material have a tendency that the sharpness is deteriorated when the grain size of SiC is increased, and the sharpness is improved when the mixed amount of SiC is increased. The number of cuts tends to increase due to the sintering heat treatment, and sharpness increases. In addition, although the blade was simply attached, the sample No. Since all of Nos. 1, 6 and 8 have materials showing the number of cut sheets exceeding the cutting edge evaluation reference number of sheets according to this method, it was confirmed that the use as a cutting tool is at a sufficiently possible level.

  In view of the above, sample no. 1 titanium blade material exhibits balanced blade material properties. In other words, this is a titanium powder blade material obtained by hot rolling and sintering using MA material obtained by MA treatment of titanium alloy powder and silicon carbide powder, and the titanium blade is cut by pure titanium side plates disposed on both sides thereof. It can be seen that it is desirable to construct

  The manufacture of a titanium blade performed in consideration of the above will be described.

  The titanium blade manufactured in this example is manufactured in the same manner as in Example 1 described above, and the titanium powder blade material is configured by using an MA material obtained by mixing and mixing titanium powder and hard powder. It is set as the structure which has arrange | positioned the titanium side plate on both sides | surfaces.

  In the preparation of the titanium powder in step S1 in the manufacturing method shown in FIG. 2, an inexpensive sponge titanium powder b (Table 2) was prepared as the titanium powder b in this example. Moreover, silicon carbide powder (GC-4000F) was prepared in the hard powder preparation of step S2.

  Next, in step S3, MA material b was obtained by mixing titanium powder and hard powder and performing MA treatment under MA treatment condition e. That is, the MA material b is a powder obtained by MA treatment by mixing 5% by volume of silicon carbide powder (GC-4000F) with sponge titanium powder.

  The MA material b was filled and hot rolled, and a titanium alloy plate (Ti-64) having a thickness of 20 mm was prepared as a material for producing a titanium casing to be a titanium side plate later (step S4).

  A rectangular titanium case using a titanium alloy plate was produced. The external dimensions were 60 mm thick, 225 mm wide, and 320 mm long (step S5).

  The titanium case was filled with the MA material b while being pressed with a press (step S6).

  Each titanium case filled with the MA material b was sealed by electron beam welding in the same manner as in Example 1 (step S7).

  Next, the titanium case filled with the MA material is hot-rolled. In this hot rolling, a titanium blade material b was obtained by rolling to a thickness of 10 mm at a heating temperature of 950 ° C. and a heating time of 60 minutes, and further hot rolling to 2 mm (step S8).

  Further, after the heat treatment, a blade-shaped body was prepared (step S9), and then sintered and cured at 1200 ° C. to prepare a titanium powder blade material (step S10).

  Then, the titanium powder cutter material after sintering and hardening was ground and attached to form a titanium cutter 2 as shown in FIG. 3 (step S11).

  FIGS. 9 to 12 are photomicrographs in place of drawings showing the structure of the unsintered titanium powder blade material hot-rolled in Example 2 and the degranulation status depending on the sintering temperature (1100 to 1200 ° C.).

  In the titanium powder blade material of FIGS. 9 to 11, silicon carbide degranulation was observed, but under the 1200 ° C. sintering temperature condition in FIG. 12, almost no degranulation was observed, so the optimum sintering temperature was set to 1200 ° C. In addition, the influence of the sintering conditions on the surface hardness (Vickers hardness) was investigated.

  As in Example 1, the surface hardness shows a tendency to increase in hardness due to the sintering hardening treatment, but the hardness before and after sintering is lower than that in Example 1. When the sintering temperature is 1100 ° C. or higher, hardness variation (sintered hardening unevenness) is observed, but at 1100 ° C. and 1200 ° C., the maximum hardness value is 400 or higher, and the effect of sintering hardening is large and practical. Is expensive.

  On the other hand, Table 11 shows the results of the sharpness measurement (the same method as in Example 1).

  Considering the result of the sharpness measurement, the effect of the sintering hardening treatment appears, and in particular, the value is larger than the reference number of 50 sheets at 1200 ° C. sintering. Furthermore, when comparing a non-sintered material knife with a 1200 ° C sintered material knife and a ceramic knife (commercially available), a knife made with a 1200 ° C sintered material has a cutting number of 120 to 150 in a sharpness test and a sintered material knife. It shows a very large value of about twice the number of sheets, but the sharpness tends to decrease relatively quickly. Similarly, the kitchen knife made from the unsintered material showed approximately twice as many sheets as the unsintered material knife, and a sharper kitchen knife than the ceramic knife (commercially available) was obtained.

  Table 12 shows the bending strength measurement results. The measurement method and conditions are the same as in Example 1 described above.

  Considering this measurement result, it can be seen that the bending strength tends to decrease as the sintering temperature of the sintering hardening process increases. For this reason, the use of a Ti-64 titanium alloy plate, which is a high-strength material, as the blade side plate provides strength characteristics that make it difficult to bend and bend as a blade.

  Moreover, in order to evaluate the corrosion resistance of the produced cutter, the salt spray test was implemented based on JISZ2371. As a tester, “Salt Dry Wet Combined Cycle Tester CYP-90” manufactured by Suga Test Instruments Co., Ltd. is used. The salt water composition is 5% NaCl aqueous solution (pH 7, neutral), salt spray temperature, pressure is 35 ± 1 ° C., 98 kPa. The test time was 24 hours. As a result of the test, there was no rust on the blade and side plates, and there was no abnormality.

  The titanium blade 2 produced in this way showed no sharpness of the silicon carbide powder, and showed a sharpness superior to that of the conventional titanium blade. Moreover, a good sharpness can be maintained for a long time, and the titanium alloy side plate functions and does not break easily even in the bending strength measurement, and it is difficult to bend. In the salt spray test, it is also resistant to rust.

  DESCRIPTION OF SYMBOLS 1 ... Titanium housing | casing, 2 ... Titanium cutter, 2a ... Titanium powder cutter material, 2b ... Titanium side plate.

As a result, although the commercially available kitchen knife has a Vickers hardness of 350 to 550, the Vickers hardness (average value) of the titanium knife after sintering in this example is 430 to 564, and there are variations. The value is close to the hardness of a general knife. In particular, sample no. 1 (MA material in which 5% of GC-4000F silicon carbide powder is mixed with titanium alloy powder), sample No. 1 5,6 (MA material obtained by mixing 10% of silicon carbide powder of GC-4000F or GC-1500F with titanium alloy powder) has sufficient hardness as a kitchen knife used in a general household.

Moreover, an example of a photograph when the structure of the cut cross section of the MA material (unsintered material and sintered material after sintering) after hot rolling is observed using an optical microscope is shown in FIGS. From the observation results, sample No. In Nos. 1 to 4, no degranulation of SiC was observed . 5-No. In all cases, SiC degranulation was observed, indicating that it was unsuitable as a blade.

This measuring method was performed with the Honda sharpness tester (Non-Patent Document 2). While fixing the test body blade, applying a weight of about 750 g with a 7.5 mm width newspaper equivalent paper, reciprocating 20 mm, and performing 17 cutting operations as one round trip, This is a test method for evaluating the number of cut papers.

Claims (22)

MA material (mechanical alloying treatment) mixed with titanium powder and silicon carbide powder is filled and sealed in a casing formed of a titanium plate, and this is hot-rolled to form a titanium blade material. ,
Titanium powder cutter composed of the MA material is formed by using this titanium cutter material to form a cutter-shaped body, and then sintering and grinding the titanium powder cutter material constituting the cutter-shaped body. A method for manufacturing a titanium blade, wherein a titanium side plate made of the titanium plate is disposed on both side surfaces of a material.   2. The method for producing a titanium blade according to claim 1, wherein the silicon carbide powder has a mean particle size of 2.5 μm to 14 μm mixed at a volume ratio of 5% or 10%.   3. The method for manufacturing a titanium blade according to claim 1, wherein the MA treatment is performed using a pot mill.   The titanium cutter manufacturing method according to claim 1, wherein a pure titanium plate or a titanium alloy plate is used for the titanium casing serving as a side plate of the cutter.   5. The method for manufacturing a titanium blade according to claim 1, wherein the sintering temperature is 1100 ° C. or 1200 ° C. 5.   6. The method of manufacturing a titanium blade according to claim 1, wherein the titanium powder is a titanium alloy powder or a sponge titanium powder.   Titanium powder cutter material obtained by sintering MA material (mechanical alloying treatment) mixed with titanium powder and silicon carbide powder, and titanium side plates disposed on both sides of the titanium powder cutter material Titanium blade characterized by that.   8. The titanium blade according to claim 7, wherein the silicon carbide powder is obtained by mixing 5% or 10% by volume of particles having an average particle diameter of 2.5 μm to 14 μm.   9. The titanium blade according to claim 7, wherein the MA material is executed using a pot mill.   10. The titanium blade according to claim 7, wherein the titanium side plate is a pure titanium plate or a titanium alloy plate.   11. The titanium blade according to claim 7, wherein the titanium powder blade material is sintered at 1100 ° C. or 1200 ° C. 11.   The titanium blade according to claim 7, wherein the titanium powder is a titanium alloy powder or a sponge titanium powder. MA material mixed with titanium powder and silicon carbide powder and subjected to MA treatment (mechanical alloying treatment) is filled and sealed in a case formed of a titanium plate,
A method for producing a titanium blade material, which is hot-rolled into a titanium blade material.   13. The method for producing a titanium blade material according to claim 12, wherein the silicon carbide powder has a mean particle size of 2.5 μm to 14 μm mixed in a volume ratio of 5% or 10%.   The method of manufacturing a titanium blade material according to claim 13 or 14, wherein the MA treatment is performed using a pot mill.   16. The method for manufacturing a titanium cutter material according to claim 13, wherein a pure titanium plate or a titanium alloy plate is used for the titanium case serving as a side plate of the cutter.   The method of manufacturing a titanium blade material according to claim 13, wherein the titanium powder is a titanium alloy powder or a sponge titanium powder.   A titanium cutter material comprising a titanium powder and silicon carbide powder MA material filled in a titanium plate casing and hot-rolled.   19. The titanium blade material according to claim 18, wherein the silicon carbide powder is a mixture of 5% or 10% by volume of particles having an average particle diameter of 2.5 μm to 14 μm.   The titanium cutter material according to claim 18 or 19, wherein the MA material is executed using a pot mill.   21. The titanium blade material according to claim 18, wherein the titanium side plate is a pure titanium plate or a titanium alloy plate.   The titanium blade material according to claim 18, wherein the titanium powder is a titanium alloy powder or a sponge titanium powder.

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