JP2922713B2 - Zirconia sintered body for tools - Google Patents
Zirconia sintered body for toolsInfo
- Publication number
- JP2922713B2 JP2922713B2 JP4128616A JP12861692A JP2922713B2 JP 2922713 B2 JP2922713 B2 JP 2922713B2 JP 4128616 A JP4128616 A JP 4128616A JP 12861692 A JP12861692 A JP 12861692A JP 2922713 B2 JP2922713 B2 JP 2922713B2
- Authority
- JP
- Japan
- Prior art keywords
- zro
- sintered body
- tool
- flaky
- volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば、包丁やスリッ
ターナイフ等の刃物や線引きダイス等のダイス類、耐磨
耗用工具類等に使用される工具用ジルコニア質焼結体に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zirconia sintered body for a tool used for a knife such as a kitchen knife or a slitter knife, a die such as a drawing die, and a tool for abrasion resistance.
【０００２】[0002]
【従来技術】従来、例えば、包丁やスリッターナイフ等
の刃物や線引きダイス等のダイス類、耐磨耗用工具類等
には鉄等の金属が使用されていた。2. Description of the Related Art Metals such as iron have conventionally been used for knives such as kitchen knives and slitter knives, dies such as drawing dies, and tools for wear resistance.
【０００３】しかしながら、このような鉄等の金属を使
用した工具は、硬度が低く、また、錆等が発生するとい
う問題があったため、近年では、硬度が高く、錆等が発
生しないセラミック製の工具が使用されるようになって
いる。[0003] However, tools using such a metal such as iron have the problems of low hardness and rust and the like. Therefore, in recent years, tools made of ceramics that have high hardness and do not generate rust and the like have been recently used. Tools are being used.
【０００４】しかし、このようなセラミック製工具で
は、使用時に応力が作用する応力作用部（例えば、包丁
やスリッターナイフ等の刃物では刃先部）が欠けやす
く、チッピングを生じ易いため、靱性の高いジルコニア
（ＺｒＯ2 ）質焼結体が使用されている（例えば、特開
平３−９３６６８号公報等参照）。However, in such a ceramic tool, a stress acting portion (for example, a cutting edge of a knife such as a kitchen knife or a slitter knife) to which a stress acts during use tends to be chipped and chipping is likely to occur. A (ZrO 2 ) sintered body is used (for example, see Japanese Patent Application Laid-Open No. 3-93668).
【０００５】[0005]
【発明が解決しようとする問題点】しかしながら、高靱
性のＺｒＯ2 質焼結体を使用した工具でも、大きな衝撃
が生じると応力作用部にチッピングが生じることがあ
り、このようなチッピングを最小限に抑制する必要があ
った。However, even with a tool using a high-toughness ZrO 2 -based sintered body, chipping may occur in the stress acting portion when a large impact occurs, and such chipping is minimized. It was necessary to suppress.
【０００６】本発明者は、このような問題点に対して充
分に検討を行った結果、工具の応力作用部には、単斜晶
ＺｒＯ2 （ｍ−ＺｒＯ2 ）が多く生成しており、正方晶
ＺｒＯ2 （ｔ−ＺｒＯ2 ）が少ないことを見出した。と
ころで、ＺｒＯ2 の強靱化は、ｔ−ＺｒＯ2 からｍ−Ｚ
ｒＯ2 へ転移する際の体積膨張という変化によって行わ
れるため、上記のようにｔ−ＺｒＯ2 が少ないという点
から考えると、従来の工具では強靱化が行われ難いとい
う問題がある。この結果、応力作用部にクラックが発生
しようとしても、ｔ−ＺｒＯ2 からｍ−ＺｒＯ2 への転
移があまり行われず、体積膨張による強靱化が行われ難
く、クラックが進展してチッピングを生じる虞があっ
た。The inventor of the present invention has thoroughly studied such problems, and as a result, a large amount of monoclinic ZrO 2 (m-ZrO 2 ) has been formed in the stress acting portion of the tool. It was found that tetragonal ZrO 2 (t-ZrO 2 ) was small. Incidentally, toughening of ZrO 2 from t-ZrO 2 m-Z
Since the change is performed by a change of volume expansion at the time of transition to rO 2 , there is a problem that it is difficult to perform toughening with a conventional tool in view of the fact that t-ZrO 2 is small as described above. As a result, even if a crack is to be generated in the stress acting portion, the transition from t-ZrO 2 to m-ZrO 2 is not performed so much, the toughness due to volume expansion is hard to be performed, and the crack may develop and chipping may occur. was there.
【０００７】この点について、本発明者はさらに検討を
行った所、応力作用部にｔ−ＺｒＯ2 が少ないのは、工
具の製造工程において必要不可欠な研磨工程で、応力作
用部がｔ−ＺｒＯ2 からｍ−ＺｒＯ2 へ転移し、応力作
用部におけるｔ−ＺｒＯ2 が少なくなっていることが明
らかになった。このような研磨の影響を取り除くため
に、種々の検討、例えば、工具の熱処理等を行ったが、
あまり効果が認められなかった。The present inventor has further examined this point. As a result, the fact that t-ZrO 2 is small in the stress acting portion is a necessary polishing process in the tool manufacturing process. The transition from 2 to m-ZrO 2 was made, and it became clear that t-ZrO 2 in the stress acting portion was reduced. In order to remove the influence of such polishing, various investigations, for example, heat treatment of the tool was performed,
No significant effect was observed.
【０００８】[0008]
【問題点を解決するための手段】本発明者は、上記の問
題点に対して検討を行った結果、ＺｒＯ2 中に鱗片状Ａ
ｌ2 Ｏ3 を添加することにより、工具における応力作用
部を強靱化できることを知見し、本発明に至った。[Means for Solving the Problems] The present inventor has studied the above problems, and as a result, found that flaky A was contained in ZrO 2.
The inventors have found that by adding l 2 O 3 , the stress acting portion of the tool can be toughened, and have reached the present invention.
【０００９】即ち、本発明の工具用ジルコニア質焼結体
は、部分安定化ジルコニアを主成分とするものであっ
て、さらに、少なくとも厚さ２μm 以下、直径１０μm
以下の鱗片状アルミナを３〜４０体積％の割合で含有し
てなるものである。That is, the zirconia sintered body for a tool according to the present invention contains partially stabilized zirconia as a main component, and further has a thickness of at least 2 μm and a diameter of 10 μm.
It contains the following flaky alumina at a ratio of 3 to 40% by volume.
【００１０】ここで、鱗片状アルミナの平均厚さを２μ
m 以下、平均直径を１０μm 以下としたのは、平均厚さ
が２μm より厚く、平均直径が１０μm より大きい場合
には、靱性改善の効果が少なく、焼結性も悪くなるから
である。鱗片状アルミナは、平均厚さが０．５μm 以
下、平均直径２μm 以下が好ましい。この範囲であれ
ば、靱性強化の効果が大きいからである。Here, the average thickness of the flaky alumina is 2 μm.
The reason why the average diameter is not more than 2 μm and the average diameter is more than 10 μm is that the effect of improving the toughness is small and the sinterability is deteriorated. The flaky alumina preferably has an average thickness of 0.5 μm or less and an average diameter of 2 μm or less. This is because within this range, the effect of strengthening toughness is large.
【００１１】また、鱗片状アルミナを３〜４０体積％添
加したのは、３体積％より少ないと、強靱性の効果が少
なく、４０体積％を越えると、緻密な焼結体が得られに
くいからである。尚、鱗片状アルミナの最適な添加量
は、焼成方法によって異なる。The reason for adding flaky alumina in an amount of 3 to 40% by volume is that if it is less than 3% by volume, the effect of toughness is small, and if it exceeds 40% by volume, it is difficult to obtain a dense sintered body. It is. The optimum amount of flaky alumina varies depending on the firing method.
【００１２】即ち、通常焼成では、３〜２０体積％が好
ましく、通常焼成した後熱間静水圧焼成法では３〜２５
体積％が好ましく、さらに、ガラスカプセルによる熱間
静水圧焼成法（ＨＩＰ）では３〜４０体積％が好まし
く、ホットプレスでは３〜３５体積％が好ましい。That is, 3 to 20% by volume is preferable in normal firing, and 3 to 25% in hot isostatic firing after normal firing.
%, More preferably 3 to 40% by volume for hot isostatic pressing (HIP) using glass capsules, and preferably 3 to 35% by volume for hot pressing.
【００１３】本発明の主成分である部分安定化ジルコニ
アとは、ｔ−ＺｒＯ2 をジルコニア中６０％以上の割合
で含有するもので、ｍ−ＺｒＯ2 ，立方晶ＺｒＯ2 （ｃ
−ＺｒＯ2 ）が４０％以下で存在していても良い。The partially stabilized zirconia which is the main component of the present invention contains t-ZrO 2 in a proportion of 60% or more in zirconia, and includes m-ZrO 2 and cubic ZrO 2 (c
—ZrO 2 ) may be present at 40% or less.
【００１４】本発明の工具用ジルコニア質焼結体を製造
するための方法としては、例えば、まず、ＺｒＯ2 に安
定化剤としてＹ2 Ｏ3 を２．５〜３モル％の割合で含有
してなる部分安定化ＺｒＯ2 を準備し、この部分安定化
ＺｒＯ2 に鱗片状Ａｌ2 Ｏ3を３〜４０体積％、焼結性
を向上すべくＹ2 Ｏ3 ，Ｅｒ2 Ｏ3 等の焼結助剤を所定
量、さらに、バインダー等を添加し、所望の成形手段、
例えば金型プレス，冷間静水圧プレス，押出し成形等に
より任意の形状に成形後、１３５０〜１５００℃で焼成
する。As a method for producing the zirconia sintered body for a tool of the present invention, for example, first, ZrO 2 contains 2.5 to 3 mol% of Y 2 O 3 as a stabilizer. The partially stabilized ZrO 2 is prepared, 3 to 40% by volume of flaky Al 2 O 3 is added to the partially stabilized ZrO 2 , and firing of Y 2 O 3 , Er 2 O 3, etc. is performed to improve sinterability. A predetermined amount of binder, further, a binder or the like is added, desired molding means,
For example, after being formed into an arbitrary shape by a die press, a cold isostatic press, an extrusion molding, or the like, firing is performed at 1350 to 1500 ° C.
【００１５】焼成は、普通焼成法，ホットプレス法およ
び熱間静水圧焼成法等が適用されるが、緻密性を向上す
るには、普通焼成の後、熱間静水圧焼成法（ＨＩＰ）す
ることが好ましい。For the firing, a normal firing method, a hot press method, a hot isostatic firing method, or the like is applied. To improve the compactness, a hot isostatic firing method (HIP) is performed after the normal firing. Is preferred.
【００１６】[0016]
【作用】本発明の工具用ジルコニア質焼結体では、例え
ば、工具の製造工程における研磨工程において、応力作
用部がｔ−ＺｒＯ2 からｍ−ＺｒＯ2 へ転移し、応力作
用部におけるｔ−ＺｒＯ2 が少なくなっている場合で
も、下記の２つの理由から靱性が大幅に向上する。In the zirconia sintered compact for a tool according to the present invention, for example, in a polishing step in a tool manufacturing process, a stress acting portion is changed from t-ZrO 2 to m-ZrO 2, and t-ZrO 2 in the stress acting portion is changed. even if the 2 is running low, the toughness is greatly improved for two reasons:.
【００１７】即ち、セラミックにおけるチッピングは、
先ず、セラミック表面に亀裂が生じ、この亀裂が次第に
拡大することにより発生するが、本発明のように、Ｚｒ
Ｏ2に鱗片状Ａｌ2 Ｏ3 を添加すると、図１に示すよう
に、鱗片状Ａｌ2 Ｏ3 １１が外部からの衝撃に対して充
分に耐える、いわゆるアンカー効果のため、靱性が向上
し、初期段階での亀裂の進展が抑制され、チッピングが
抑制される。That is, chipping in ceramic is
First, cracks are formed on the ceramic surface, and the cracks are generated by gradually expanding the cracks.
If O 2 is added scaly Al 2 O 3, as shown in FIG. 1, scaly Al 2 O 3 11 to withstand sufficiently against external shock, for so-called anchor effect, to improve toughness, Crack growth in the initial stage is suppressed, and chipping is suppressed.
【００１８】また、本発明の工具用ジルコニア質焼結体
では、図１に示したように、焼結体１３に亀裂が生じよ
うとすると、鱗片状Ａｌ2 Ｏ3 １１に引張力が作用し、
この鱗片状Ａｌ2 Ｏ3 １１のまわり１５に存在するｔ−
ＺｒＯ2 がｍ−ＺｒＯ2 へ転移し、ｍ−ＺｒＯ2 へ転移
する量が大幅に向上し、鱗片状Ａｌ2 Ｏ3 １１のまわり
の焼結体１３の体積が膨張し、亀裂の拡大が抑制され、
BR>靱性が向上する。In the zirconia sintered body for a tool according to the present invention, as shown in FIG. 1, when a crack is to be generated in the sintered body 13, a tensile force acts on the flaky Al 2 O 3 11. ,
T- existing around the flaky Al 2 O 3 11
ZrO 2 is transferred to the m-ZrO 2, the amount of transition to m-ZrO 2 is greatly improved, the volume of the sintered body 13 around the scaly Al 2 O 3 11 is expanded, the expansion of cracks suppression And
BR> Toughness improves.
【００１９】以下、本発明を次の例で説明する。Hereinafter, the present invention will be described with reference to the following examples.
【００２０】[0020]
【実施例】原料粉末として、安定化剤としてＹ2 Ｏ3 を
３モル％含有するｔ−ＺｒＯ2 を主体とする部分安定化
ＺｒＯ2 の共沈原料粉末（平均結晶粒径０．５μｍ）を
調合し、充分粉砕混合する。この部分安定化ＺｒＯ2 中
に、表１に示す焼結体となるように鱗片状Ａｌ2 Ｏ3 お
よび焼結助剤を所定量秤量添加した後、アトリッション
ミルで３０分間混合粉砕した。この混合粉末にバインダ
ーとしてパラフィンワックスを添加混合した後、これを
乾燥し、加圧力２ton/cm2 でプレス成形した。この成形
体を、大気中において、１４５０℃の温度で、１時間焼
成した。EXAMPLE As a raw material powder, a partially stabilized ZrO 2 co-precipitated raw material powder (average crystal grain size: 0.5 μm) mainly composed of t-ZrO 2 containing 3 mol% of Y 2 O 3 as a stabilizer was used. Mix, pulverize and mix well. A predetermined amount of scaly Al 2 O 3 and a sintering aid were added to the partially stabilized ZrO 2 so as to obtain a sintered body as shown in Table 1, and then mixed and pulverized for 30 minutes using an attrition mill. After adding and mixing paraffin wax as a binder to the mixed powder, it was dried and press-molded at a pressure of 2 ton / cm 2 . The molded body was fired in the atmosphere at a temperature of 1450 ° C. for one hour.
【００２１】[0021]
【表１】 [Table 1]
【００２２】そして、各焼結体に対してＪＩＳＲ１６０
１に従い３点曲げ抗折強度およびビッカース硬度を測定
した。また、試料を鏡面状態にポリッシングしてＩＦ法
で破壊靱性を測定した。さらに、各試料をダイヤモンド
砥石で研磨し、刃物形状に加工し、１００時間使用した
後、チッピングが生じているかどうかの検査を行った。
この結果を表２に示した。Then, JISR160 is applied to each sintered body.
According to 1, the three-point bending strength and Vickers hardness were measured. Further, the sample was polished to a mirror surface state, and the fracture toughness was measured by the IF method. Further, each sample was polished with a diamond grindstone, processed into a blade shape, and used for 100 hours. After that, an inspection was performed to determine whether chipping had occurred.
The results are shown in Table 2.
【００２３】[0023]
【表２】 [Table 2]
【００２４】表２より、本発明の試料は、いづれも高い
強度，靱性，硬度が得られるとともに、一定時間使用後
においてもチッピングが発生しないか、発生しても極微
小であった。From Table 2, it can be seen that all of the samples of the present invention have high strength, toughness, and hardness, and that no chipping occurs even after a certain period of use, or that the chipping is extremely small.
【００２５】[0025]
【発明の効果】以上詳述した通り、本発明の工具用ジル
コニア質焼結体では、ＺｒＯ2 に鱗片状Ａｌ2 Ｏ3 を添
加すると、この鱗片状Ａｌ2 Ｏ3 が外部からの衝撃に対
して充分に耐える、いわゆるアンカー効果のため、靱性
が向上し、初期段階での亀裂の進展が抑制され、チッピ
ングが抑制される。また、焼結体に亀裂が生じようとす
ると鱗片状Ａｌ2 Ｏ3 に引張力が作用し、この鱗片状Ａ
ｌ2 Ｏ3 のまわりに存在するｔ−ＺｒＯ2 がｍ−ＺｒＯ
2 へ転移し、鱗片状Ａｌ2 Ｏ3 のまわりの体積が膨張
し、亀裂の拡大が抑制される。従って、本発明の工具用
ジルコニア質焼結体を工具に適用した場合に、工具の製
造工程における研磨工程において、応力作用部がｔ−Ｚ
ｒＯ2 からｍ−ＺｒＯ2 へ転移し、ｔ−ＺｒＯ2 が少な
くなっている場合でも、靱性を大幅に向上することがで
き、これにより、チッピングを大幅に抑制することがで
きる。As described in detail above, in the zirconia sintered body for a tool of the present invention, when flaky Al 2 O 3 is added to ZrO 2 , the flaky Al 2 O 3 is resistant to external impact. Because of the so-called anchor effect, the toughness is improved, crack propagation in the initial stage is suppressed, and chipping is suppressed. Further, when a crack is to be generated in the sintered body, a tensile force acts on the flaky Al 2 O 3 , and this flaky A 2 O 3 is formed.
t-ZrO 2 existing around l 2 O 3 is changed to m-ZrO
2 , the volume around the flaky Al 2 O 3 expands, and the expansion of cracks is suppressed. Therefore, when the zirconia sintered body for a tool of the present invention is applied to a tool, the stress acting portion is t-Z in the polishing step in the tool manufacturing process.
Even when the transition from rO 2 to m-ZrO 2 and the amount of t-ZrO 2 is reduced, the toughness can be greatly improved, and thereby chipping can be largely suppressed.
【図１】鱗片状Ａｌ2 Ｏ3 添加の効果を示すための組織
図である。FIG. 1 is a structural diagram showing the effect of the addition of scaly Al 2 O 3 .
１１ 鱗片状Ａｌ2 Ｏ3 １３ 焼結体11 Scale-like Al 2 O 3 13 sintered body
Claims (1)
厚さ２μｍ以下、平均直径１０μｍ以下の鱗片状アルミ
ナを３〜４０体積％の割合で含有することを特徴とする
工具用ジルコニア質焼結体。1. A zirconia sintered material for a tool, comprising partially stabilized zirconia as a main component and 3 to 40% by volume of flaky alumina having an average thickness of 2 μm or less and an average diameter of 10 μm or less. body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4128616A JP2922713B2 (en) | 1992-05-21 | 1992-05-21 | Zirconia sintered body for tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4128616A JP2922713B2 (en) | 1992-05-21 | 1992-05-21 | Zirconia sintered body for tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05319924A JPH05319924A (en) | 1993-12-03 |
| JP2922713B2 true JP2922713B2 (en) | 1999-07-26 |
Family
ID=14989196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4128616A Expired - Fee Related JP2922713B2 (en) | 1992-05-21 | 1992-05-21 | Zirconia sintered body for tools |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2922713B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117383932A (en) * | 2023-10-11 | 2024-01-12 | 江苏利宇剃须刀有限公司 | Preparation method of ceramic blade of manual shaver |
-
1992
- 1992-05-21 JP JP4128616A patent/JP2922713B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05319924A (en) | 1993-12-03 |
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