JP6280004B2 - Fishing line guide member - Google Patents

Description

  The present invention relates to a fishing line guide member.

  In general, a fishing line guide attached to a fishing rod includes a rigid fishing line guide member, a so-called yarn introduction ring, a holding portion having a shape capable of fitting the fishing line guide member to the inner periphery, and a fishing line guide. It is comprised from the attachment part for attaching to. The fishing line guide member is formed in a ring shape so that the fishing line drawn from the reel can be inserted and guided. In particular, the fishing line guide member that requires wear resistance is made of ceramic. Has been applied.

  As such a fishing line guide member made of ceramics, for example, in Patent Document 1, a fishing line guide surface is formed on the surface of ceramics mainly composed of silicon carbide, and there are pores in the vicinity of the guide surface. There has been proposed a fishing line guide member made of dense ceramics having a smooth flat surface between the pores and substantially no pores inside.

Japanese Patent No. 3540912

  In recent years, fishing line guide members are required to be further improved in wear resistance so that they are less likely to have wear marks when slid with the fishing line and can be used over a long period of time.

  The present invention has been devised to satisfy the above-described requirements, and an object thereof is to provide a fishing line guide member having excellent wear resistance.

The fishing line guide member of the present invention is a silicon carbide sintered body in which the silicon carbide crystal polymorph is a 6H type, 4H type, and 15R type, and the average crystal grain size is less than 5 μm. Of the total 100% by mass of the 4H type and the 15R type, the 4H type is 4% by mass or more 18
The 15R type is 4% by mass or more and 8% by mass or less, and the balance is the 6H type.

The fishing line guide member of the present invention is a silicon carbide sintered body in which the silicon carbide crystal polymorph is a 6H type, 4H type, and 15R type, and the average crystal grain size is less than 5 μm. Of the total mass of 4H type and 15R type, 4H type is 4% by mass to 18% by mass, 15R type is 4% by mass to 8% by mass, and the remainder is 6H type Therefore, since it has high hardness and excellent wear resistance, and when it is slid with a fishing line, it is difficult to have a wear mark, so that it can be used for a long period of time.

It is the schematic which shows an example of a structure of the abrasion-resistant evaluation apparatus used for abrasion resistance evaluation of the guide member for fishing lines of this embodiment.

  Hereinafter, the fishing line guide member of the present embodiment will be described.

The fishing line guide member of the present embodiment is a silicon carbide sintered body in which the silicon carbide crystal polymorph is a 6H type, 4H type, and 15R type, and the average crystal grain size is less than 5 μm. Of the total mass of 4H type and 15R type, 4H type is 4% by mass to 18% by mass, 15R type is 4% by mass to 8% by mass, and the remainder is 6H type . Because the silicon carbide crystal polymorph is in the above-mentioned range, it has high hardness, excellent wear resistance, and it is difficult to have wear marks when sliding with fishing line. it can.

  Here, the reason why the hardness is high and the wear resistance is excellent is that the average crystal grain size is less than 5 μm and the crystal polymorph of silicon carbide is in the above-mentioned range. However, because the hexagonal 4H type and 6H type are 90% by mass or more, the rhombohedral 15R type is contained in an amount of 4% by mass or more and 8% by mass or less. The mechanism is not clear as to whether it depends on the content ratio.

And the silicon carbide sintered body in the present embodiment is one in which the content of silicon carbide occupies 90 mass% or more out of 100 mass% of all components constituting the silicon carbide sintered body. The presence of silicon carbide in the sintered body is first measured using an X-ray diffractometer (XRD), and the obtained 2θ (2θ is the diffraction angle) is used to determine the presence of silicon carbide using a JCPDS card. It can be confirmed by identifying. And about content, for example, ICP (Inductively Coupled Plasma) emission-spectral-analysis apparatus (ICP) may be used for quantitative analysis of silicon (Si), and it may be converted into silicon carbide (SiC) using this value. .

  When the silicon carbide content is 90% by mass or more, the peak indicating SiC in the XRD measurement appears highest in the chart. In addition, in the XRD confirmation, when no carbide other than silicon carbide is confirmed, the carbon (C) may be quantitatively analyzed using a carbon analyzer and converted to silicon carbide (SiC) using this value. .

  Moreover, about the crystal polymorph of silicon carbide, it can obtain | require by analyzing the result measured using XRD by the Rietveld method. When other crystals are present, the total mass of the crystal polymorphs of silicon carbide may be used as the denominator, and the mass of each crystal polymorph may be expressed as a numerator.

Moreover, about hardness (Vickers hardness (Hv)), it is JIS R 1610-2003 (ISO).
14705: 2000 (MOD)).

  In the fishing line guide member of the present embodiment, it is preferable that the silicon carbide sintered body has an average crystal grain size of 2 μm or less. When the average crystal grain size is 2 μm or less, since it is a fine crystal structure in sliding with the fishing line, the stress applied during sliding is dispersed in a plurality of crystals, so that it becomes difficult to have wear marks. It can be used for a long time.

  The average crystal grain size in the silicon carbide sintered body can be determined by a known planimetric method. Specifically, the surface of the sample is photographed at a magnification of 1000 times using a scanning electron microscope (SEM). Next, a circle with a known area is drawn on the obtained photograph, and the number of particles in the circle and the number of particles on the circumference are counted.

The numerical values of the area A of the circle, the number of particles Nc in the circle, the number of particles Nj applied to the circumference, and the magnification M are expressed by the following formula ((Nc + (1/2) × Nj) / (A / M2)). By substituting, the number Ng of particles per unit area is obtained. Furthermore, the average crystal grain size of the silicon carbide based sintered body can be obtained by substituting the value of the number of particles Ng per unit area into the following equation (1 / √ (Ng)).

  Further, the wear resistance of the fishing line guide member to the fishing line can be evaluated by a heating test using the wear resistance evaluation apparatus shown in FIG. Here, as shown in FIG. 1, the wear resistance evaluation apparatus is a tip of a fishing line 3 that is passed through a fishing line guide member 1 through a fishing line 3 connected to a cylinder 2 and hung from the fishing line guide member 1 as a starting point. In this state, the fishing line is slid by suspending the weight 4 and reciprocating the cylinder 2 at a constant speed and stroke. The heating test is an evaluation of the amount of wear after a predetermined number of reciprocations.

  In addition, the fishing line guide member of the present embodiment preferably includes an oxide crystal containing aluminum and a rare earth element. When an oxide crystal containing aluminum and a rare earth element is included, the grain growth of the silicon carbide crystal is suppressed and the crystal structure is further refined, so that the wear resistance is further improved. Here, examples of rare earth elements include yttrium (Y), ytterbium (Yb), cerium (Ce), dysprosium (Dy), lanthanum (La), erbium (Er), and lutetium (Lu). From the viewpoint of refining the crystal structure, the rare earth element is preferably yttrium.

Note that the confirmation of the crystal of the oxide containing aluminum and a rare earth element may be performed using XRD and identified using a JCPDS card from the obtained 2θ value. Further, the content of oxide crystals containing aluminum and rare earth elements is preferably 1.3 to 1.6% by mass with respect to a total of 100% by mass of the masses of the 6H type, 4H type and 15R type. Here, the content of the crystal of the oxide containing aluminum and the rare earth element is obtained by analyzing the result of measurement using XRD by the Rietveld method.

Examples of the oxide crystal containing aluminum and yttrium include YAlO ₃ (YAP), Y ₄ Al ₂ O ₉ (YAM), and Y ₃ Al ₅ O ₁₂ (YAG). Among them, since the silicon carbide sintered body containing YAP has the highest hardness, the oxide crystal containing aluminum and yttrium is preferably YAP.

  Whether or not an oxide crystal containing aluminum and a rare earth element is contained can be confirmed by measuring using XRD and identifying the obtained 2θ value using a JCPDS card.

  Next, an example of the manufacturing method of the fishing line guide member of this embodiment is demonstrated.

First, as starting materials, silicon carbide powder (average particle size (D ₅₀ ) = 0.3 to 1.7 μm), yttria (Y ₂ O ₃ ) powder (average particle size 0.5 to ₂ μm) which is an oxide powder of a rare earth element, Alumina (Al ₂ O ₃ ) powder (average particle size = 0.3 to 1.5 μm) is prepared. Thereafter, each powder is weighed in a predetermined amount, and put together with various binders such as polyvinyl alcohol (PVA) and polyethylene glycol (PEG) into a mill such as a rotary mill, a vibration mill, a bead mill, etc., and wet-mixed and pulverized. Make it.

The silicon carbide crystal polymorphs consist of 6H, 4H and 15R types. Of the total mass of 6H, 4H and 15R, 4H type is 4% by mass to 18% by mass. In order to obtain a silicon carbide sintered body in which the 15R type is 4% by mass or more and 8% by mass or less and the balance is 6H type, the 4H type is obtained from the crystal polymorphic structure in the raw material silicon carbide powder. Increases, while 6H type decreases, 4H type is 3 mass% to 10 mass%, 15R type is 4 mass% to 8 mass%, and the balance is 6H type silicon carbide Powder may be used.

Further, in order to make the average crystal grain size of the silicon carbide based sintered body 2 μm or less, the particle size of the silicon carbide powder may be 0.7 μm or less. Furthermore, in order to include an oxide crystal containing aluminum and a rare earth element, a part of the Al ₂ O ₃ powder and a part of the oxide powder of the rare earth element may be calcined and added in advance.

  Next, the slurry is spray-granulated using a spray granulation drying device (spray dryer) to obtain spherical granules, then the spherical granules are molded by a powder press molding method, and cutting is performed as necessary. To give a molded body.

  And the obtained molded object is put into the baking container made from silicon carbide, and it bakes at the highest temperature of 1800-2200 degreeC. In addition, the 4H type is 3% by mass or more and 10% by mass or less, the 15R type is 4% by mass or more and 8% by mass or less, and the balance is 6H type. 4H type is 4 mass% or more and 18 mass% or less, 15R type is 4 mass% or more and 8 mass% or less, and the balance is 6H type crystalline polymorphic silicon carbide sintered You can get a body.

  When a carbon firing container is used, the mass of the 4H-type crystal polymorph is greatly increased, and a silicon carbide sintered body in the above range cannot be obtained, and the average crystal grain size is 5 μm. It will exceed.

  Then, after firing, a curved surface is formed by barrel processing or grinding, and finally centerless processing is performed, whereby the fishing line guide member made of the silicon carbide based sintered body of the present embodiment can be obtained.

  Examples of the present invention will be specifically described below, but the present invention is not limited to these examples.

  Samples having different masses of crystal polymorphs of silicon carbide were prepared, and the hardness was compared.

As starting materials, a silicon carbide powder whose crystal polymorph is a mass ratio shown in Table 1, an average particle diameter of 1.6 μm, an yttria powder having an average particle diameter of 1 μm, and an alumina powder having an average particle diameter of 0.8 μm. Got ready. Then, 95% by mass of silicon carbide powder, 4% by mass of yttria powder, and 1% by mass of alumina powder were weighed.

  Next, the weighed powder, polyvinyl alcohol, and solvent were placed in a rotary mill, and mixed and pulverized for a predetermined time to prepare a slurry. The slurry was sprayed and granulated using a spray granulation dryer to obtain spherical granules, and then the spherical granules were molded by a powder press molding method to obtain a prismatic shaped body. And the obtained molded object was put in the baking container made from silicon carbide, and it hold | maintained the highest temperature of 1900 degreeC for 5 hours, and baked, sample No. 1-6 were obtained.

  For each sample, the average crystal grain size was calculated by the planimetric method. Specifically, the SEM is used to photograph the sample surface at a magnification of 1000 times, a circle with a known area is drawn on the obtained photograph, and the number of particles in the circle and the number of particles on the circumference are counted. did.

Next, the numerical values of the area A of the circle, the number of particles Nc in the circle, the number of particles Nj applied to the circumference, and the magnification M are expressed by the following formula ((Nc + (1/2) × Nj) / (A / M2)) To obtain the number Ng of particles per unit area and substitute the value of the number Ng of particles per unit area into the following equation (1 / √ (Ng)) to calculate the average crystal grain size. As a result, sample no. The average crystal grain size in 1 to 6 was 4.4 μm to 4.6 μm.

  Next, measurement was performed by XRD, and the result was analyzed by the Rietveld method to determine the mass of each crystal polymorph in a total of 100% by mass of the mass of 6H type, 4H type, and 15R type.

Further, a part of the sample surface was ground to obtain a flat surface, and the Vickers hardness (Hv) was measured using the flat surface in accordance with JIS R 1610-2003 (ISO 14705: 2000 (MOD)). The results are shown in Table 1.

From Table 1, the crystal polymorphs of silicon carbide consist of 6H type, 4H type and 15R type, the average crystal grain size is less than 5 μm, and the total mass of 6H type, 4H type and 15R type is 100% by mass. 4
H type is 4% by mass or more and 18% by mass or less, 15R type is 4% by mass or more and 8% by mass or less, and the balance is 6H type, so that it has high hardness and excellent wear resistance. I found out that

  Next, samples having different average particle diameters of silicon carbide powder used as a starting material were prepared, and hardness and wear evaluation were compared. In addition, sample No. of Example 1 except having set it as the average particle diameter shown in Table 2. It was produced by the same method as 2. Sample No. 7 is a sample No. 7 in Example 1. Same as 2.

  Then, the average crystal grain size was calculated and the hardness was measured by the same method as in Example 1.

  In addition, a heating test was performed using the wear resistance evaluation apparatus shown in FIG. 1, the wear depth was measured, and ranking was performed from the least wear amount. In the heating test, the wear depth after 1000 reciprocations was measured under the condition that the weight of the weight was 4.5 kg, the cylinder stroke was 300 mm, and reciprocated once every 3 seconds. The results are shown in Table 2.

  From Table 2, it was found that when the average crystal grain size of the silicon carbide based sintered body is 2 μm or less, the silicon carbide sintered body has further excellent wear resistance.

Next, the oxides containing aluminum and rare earth elements were included, and changes in hardness and wear evaluation due to differences in the included crystals were confirmed. First, YAlO ₃ (YAP), Y ₄ Al ₂ O ₉ (YAM), Y ₃ Al ₅ O ₁₂ (YAG) are synthesized by calcining using a part of yttria powder and a part of alumina powder. Was generated.

  And sample No. of Example 2 except having added to each starting material. A sample was prepared in the same manner as in 10. Sample No. No calcining synthesis was carried out for sample 11, sample no. Same as 10.

  Then, using XRD, the crystal other than silicon carbide is identified using the JCPDS card from the obtained 2θ value, and the result measured using XRD is analyzed by the Rietveld method. And the content of oxide crystals containing rare earth elements. The content of the oxide crystals containing aluminum and rare earth elements is a value relative to the total mass of 100% by mass of the 6H type, 4H type and 15R type masses.

  Further, the hardness was measured by the same method as in Example 1, and the wear was evaluated by the same heating test as in Example 2.

From Table 3, it was found that the inclusion of oxide crystals containing aluminum and rare earth elements has even better wear resistance. Further, it has been found that it is preferable that YAlO ₃ (YAP) is contained among oxide crystals containing aluminum and rare earth elements.

1: Guide member for fishing line 2: Cylinder 3: Fishing line 4: Weight

Claims (4)

  The silicon carbide crystal polymorph is a silicon carbide sintered body composed of 6H type, 4H type and 15R type, the average crystal grain size is less than 5 μm, and the 6H type, 4H type and 15R type Of the total 100% by mass, the 4H type is 4% by mass or more and 18% by mass or less, the 15R type is 4% by mass or more and 8% by mass or less, and the remainder is the 6H type. A fishing line guide member.   2. The fishing line guide member according to claim 1, wherein the silicon carbide sintered body has an average crystal grain size of 2 μm or less.   3. The fishing line guide member according to claim 1, further comprising an oxide crystal containing aluminum and a rare earth element. The fishing line guide member according to claim 3, wherein the oxide crystal is AlYO ₃ .

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