JPH0761864A - Guide member - Google Patents

Abstract

PURPOSE:To obtain a guide member having high strength and excellent in corrosion resistance and abrasion resistance. CONSTITUTION:This guide member is constituted of a zirconia sintered compact consisting essentially of tetragonal zirconia crystal and containing 10-40wt.% scaly alumina having <=2mum average thickness and 2-10mum average diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various guide members such as fiber guides, fishing line guides and tape guides.

[0002]

2. Description of the Related Art Conventionally, as a fishing line guide member having excellent wear resistance, there is a guide member using alumina ceramics or silicon carbide ceramics. However, these ceramic guides have
In particular, since the toughness is low and the impact resistance is poor, when the fishing tackle is dropped on rock, problems such as cracking and chipping often occur.

Therefore, as disclosed in Japanese Patent Publication No. 63-41532, as a fishing line guide excellent in impact resistance,
It has been proposed to use a partially stabilized zirconia (PSZ) sintered body having an average crystal grain diameter of 0.2 to 1.0 μm.

[0004]

However, the Vickers hardness of the partially stabilized zirconia (PSZ) sintered body is 1200 to 1400 kg, which is almost the same as the hardness of silica (SiO ₂ ) contained in sea sand or river sand. Since there is only / mm ² ,
There is a problem that the guide member is scratched and thread breakage easily occurs.

Further, although various ceramics are used for fiber guides, tape guides, etc., no one having high toughness and excellent wear resistance has been obtained.

[0006]

Therefore, the inventor of the present invention has developed a high strength (100 kg / mm ²⁾ required as a fishing line guide member.
Above), high hardness (1400 kg / mm ² or more), high toughness (6 MPa√m or more), and further, to obtain a guide member satisfying the conditions of being strong against tribochemical reaction due to seawater, etc. As a result of repeated studies, the average thickness of the zirconia sintered body containing a tetragonal phase as the main component was 2
1 scale of scaly alumina having an average diameter of 2 to 10 μm at a size of not more than μm
The inventors have found that the ceramics obtained by containing them in a proportion of 0 to 40% by weight satisfy all the above conditions, and have reached the present invention.

That is, the guide member excellent in wear resistance of the present invention is a zirconia sintered body containing a tetragonal phase as a main component, and is composed of scaly alumina having an average thickness of 2 μm or less and an average diameter of 2 to 10 μm. It is contained at a rate of 10 to 40% by weight.

[0008] Here, the scaly alumina refers to substantially disk-shaped (scaly) alumina particles, and by incorporating such scaly alumina, toughness due to the anchor effect can be achieved. it can. Further, the zirconia sintered body to which the flaky alumina is added can have better sinterability than that to which the whisker-like alumina is added.

The average thickness of the flaky alumina is 2 μm.
Hereinafter, the average diameter of 2 to 10 μm means that the average thickness is 2
This is because if the thickness is thicker than μm and the average diameter is larger than 10 μm, the sinterability is deteriorated, and if the average diameter is 2 μm or less, the toughening effect is lowered. More preferably, the scale-like alumina has an average thickness of 1.5 μm or less and an average diameter of 3 to 7 μm.

Further, the addition amount of the scaly alumina is 10 to 4
The reason why the content is 0% by weight is that if it is less than 10% by weight, the toughening effect is small, and if it exceeds 40% by weight, it is difficult to obtain a dense sintered body. The optimum addition amount of the flaky alumina depends on the firing method. That is, 10 to 15% by weight is preferable in the normal firing method, and 10 to 35% by weight in the case of performing hot isostatic firing (HIP) after the normal firing.
Is preferable, and in the hot pressing method, 10 to 40% by weight is preferable.

The main body of the sintered body forming the guide member of the present invention is a tetra-phase meta-stabilized zirconia polycrystal (TZ).
P), and the tetragonal phase in the zirconia component is preferably contained in an amount of 80 mol% or more.

As a method for producing the guide member of the present invention, for example, Y ₂ O ₃ as a stabilizer is added to the tetra-phase meta-stabilized zirconia powder in an amount of 2.5 to 3.0 mol%.
A zirconia raw material containing 10 to 40% by weight of scaly alumina is added to this zirconia raw material, and Y ₂ O ₃ , Er ₂ O ₃ or the like is sintered to improve sinterability. A predetermined amount of auxiliary agent is added. Further, a binder and the like are added, and the mixture is molded into a desired shape by a desired molding means such as a die press, a cold isostatic press (CIP), an extrusion molding or the like, and then fired at 1350 to 1500 ° C.

As the firing, a normal firing method, a hot pressing method, and a hot isostatic firing method (HIP) are applied. To improve the denseness, it is preferable to perform the HIP after the normal firing.

[0014]

The guide member of the present invention is toughened by the anchor effect by adding scaly alumina to the zirconia sintered body, and can sufficiently withstand external impact. With this toughening mechanism, the development of cracks in the initial stage is suppressed, chipping, cracking, etc. are prevented, and the sustainability of these effects can be made extremely high.

[0015]

EXAMPLE A raw material powder of TZP containing 3.0 mol% of Y ₂ O ₃ as a stabilizer and having an average crystal grain size of 0.5 μm was prepared by adding scaly alumina into a sintered body as shown in Table 1, and After a predetermined amount of the sintering aid was added, the mixture was ground and mixed for 30 minutes with an attrition mill. After adding a predetermined amount of paraffin wax as a binder to this mixed powder, it is dried,
Dry press molding was performed under a pressure of 1.0 ton / cm ² . This molded body was fired in the air at a temperature of 1450 ° C. for 1 hour and then subjected to HIP treatment.

JIS 1601 is applied to each sintered body.
The three-point bending strength and Vickers hardness were measured in accordance with. Further, the sample was polished into a mirror surface state and the fracture toughness value was measured by the IF method. Furthermore, as shown in FIG.
Each sample was subjected to a wear resistance test in which a nylon fishing line (Silver Scale No. 3.0) was slid at 0.5 m / sec while dripping seawater at 1 cc / sec, and scratched or worn on the samples after sliding 3000 m. Those with occurrence of are indicated by x, and those with excellent wear resistance without any change are indicated by o. The results are shown in Table 2.

In Tables 1 and 2, sample numbers marked with * indicate those outside the scope of the present invention.

[0018]

[Table 1]

[0019]

[Table 2]

From Table 2, No. The sample No. 1 had a scaly alumina content of less than 10% by weight, and therefore had a low Vickers hardness, and a scratch was generated as a result of the abrasion resistance test, and the yarn was broken during the process. The fracture toughness value was also low. No. Three
The sample had a low fracture toughness value because the average diameter of the flaky alumina was smaller than 2 μm. No. In the sample of No. 8, since the average thickness of the flaky alumina was thicker than 2 μm, the sinterability was deteriorated, and the results of the bending strength, Vickers hardness, and abrasion resistance test were all extremely bad. No. In the sample No. 11, since the average diameter of the flaky alumina was larger than 10 μm, the sinterability was poor and the bending strength was low. N
o. The sample of No. 15 had a scaly alumina content of more than 40% by weight, so the sinterability was poor and the bending strength was low. As described above, it can be seen that those outside the scope of the present invention are inferior in some characteristics.

On the other hand, the samples within the scope of the present invention are:
High strength of 140kg / mm ² or more, 6.0MP
A high toughness of a√m or more and a high Vickers hardness of 1400 kg / mm ² or more were obtained, and the result of the wear resistance test was excellent without any problem.

In the above embodiments, only the fishing line guide member has been described, but the guide member of the present invention is
Needless to say, it can be suitably used as various guide members such as a fiber guide member and a magnetic tape guide member.

[0023]

As described in detail above, according to the present invention,
10 to 4 scale-like alumina having a tetragonal zirconia crystal as a main component and an average thickness of 2 μm or less and an average diameter of 2 to 10 μm
Since the guide member is made of a zirconia sintered body containing 0% by weight, it is possible to obtain a guide member that satisfies the conditions of high strength and high hardness and is strong against tribochemical reaction due to seawater or the like. Further, due to the anchor effect of the scaly alumina, the toughness is improved, the progress of cracks in the initial stage is suppressed, and chipping, cracking, cracking, etc. can be prevented. Therefore, it is possible to obtain a guide member that can be used favorably for a long period of time.

[Brief description of drawings]

FIG. 1 is a diagram showing a wear resistance test device for a guide member of the present invention.

Claims (1)

[Claims] 1. A tetragonal zirconia crystal as a main component, 10
A guide member made of a zirconia sintered body containing -40% by weight of scaly alumina.