JPH06234566A - Aluminum oxide-based ceramics excellent in resistance to thermal plastic deformation - Google Patents
Aluminum oxide-based ceramics excellent in resistance to thermal plastic deformationInfo
- Publication number
- JPH06234566A JPH06234566A JP5044588A JP4458893A JPH06234566A JP H06234566 A JPH06234566 A JP H06234566A JP 5044588 A JP5044588 A JP 5044588A JP 4458893 A JP4458893 A JP 4458893A JP H06234566 A JPH06234566 A JP H06234566A
- Authority
- JP
- Japan
- Prior art keywords
- zro
- cutting
- aluminum oxide
- plastic deformation
- based ceramics
- 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.)
- Pending
Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、すぐれた耐熱塑性変
形性を有し、したがって例えば高い発熱を伴なう鋼の高
速切削や、高送りおよび高切込みなどの重切削に切削工
具として用いるのに適した酸化アルミニウム（以下、Ａ
ｌ2 Ｏ3 で示す）基セラミックスに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has excellent heat plastic deformation and therefore is used as a cutting tool for high speed cutting of steel with high heat generation and heavy cutting such as high feed and high depth of cut. Suitable for aluminum oxide (hereinafter A
(referred to as l 2 O 3 ) base ceramics.
【０００２】[0002]
【従来の技術】従来、一般に、例えば特開昭５６−５３
７３号公報に記載される通り、重量％で（以下、％は重
量％を示す）、酸化ジルコニウム（以下、ＺｒＯ2 で示
す）および／または安定化ＺｒＯ2 を５〜５０％含有
し、残りが実質的にＡｌ2 Ｏ3 からなる組成、並びに前
記ＺｒＯ2 および／または安定化ＺｒＯ2 が粒状分散相
として存在する組織を有するＡｌ2 Ｏ3 基セラミックス
が知られており、またこのＡｌ2 Ｏ3 基セラミックス
が、例えば鋼の切削に切削工具として用いられているこ
とも知られている。2. Description of the Related Art Conventionally, generally, for example, JP-A-56-53.
No. 73, contains 5 to 50% by weight of zirconium oxide (hereinafter referred to as ZrO 2 ) and / or stabilized ZrO 2 in weight% (hereinafter,% indicates weight%), and the balance is compositions consisting essentially of Al 2 O 3, and said and ZrO 2 and / or stabilized ZrO 2 is known to Al 2 O 3 based ceramic material having a tissue present as particulate dispersed phase and the Al 2 O 3 It is also known that base ceramics are used as cutting tools for cutting steel, for example.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の切削加工
の省力化に対する要求は厳しく、これに伴ない切削加工
の高速化および重切削化が強く望まれているが、これら
の切削に上記従来Ａｌ2Ｏ3 基セラミックスを適用した
場合、いずれの場合も高い発熱を伴なうものであるため
に切刃が熱変形を起し、比較的短時間で使用寿命に至る
のが現状である。On the other hand, in recent years, demands for labor saving in cutting have been severe, and accordingly, high speed and heavy cutting of cutting have been strongly demanded. When Al 2 O 3 -based ceramics are applied, the cutting edge is thermally deformed because of the high heat generation in any case, and the operating life is relatively short.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、耐熱塑性変形性のすぐれたＡｌ
2 Ｏ3 基セラミックスを開発すべく、特に上記の従来Ａ
ｌ2 Ｏ3 基セラミックスに着目し研究を行なった結果、
上記の従来Ａｌ2 Ｏ3 基セラミックスは、原料粉末とし
てＡｌ2 Ｏ3 粉末と、ＺｒＯ2 および／またはＹ
2 Ｏ3 、ＭｇＯ、およびＣｅＯ2 などのうちの１種以上
からなる安定化助剤を０．１〜２０モル％の割合で固溶
させてなる安定化ＺｒＯ2 粉末を用い、これら原料粉末
を所定の割合に配合し、ボールミルにて粉砕混合し、こ
の結果の混合粉末をホットプレスすることにより製造さ
れているが、上記の原料粉末のほかに、Ａｌ2 Ｏ3 粉末
の表面に、例えばゾルゲル法により、まずＺｒＯ2 およ
び／または安定化ＺｒＯ2 を所定の厚さで層状に被覆
し、さらに良好な焼結性を確保する目的でその上にＡｌ
2 Ｏ3 を同じく所定の厚さで層状に被覆してなる２重被
覆Ａｌ2 Ｏ3 粉末を用い、これらの原料粉末を所定の割
合に配合し、混合してなる混合粉末をホットプレスする
ことによりＡｌ2 Ｏ3 基セラミックスを製造すると、従
来のＡｌ2 Ｏ3 基セラミックスでは、粒状のＺｒＯ2 お
よび／または安定化ＺｒＯ2 結晶粒が分散分布した組織
をもつものであったものが、ＺｒＯ2 および／または安
定化ＺｒＯ2 の一部が、上記Ａｌ2 Ｏ3 結晶粒の表面を
部分的あるいは全面的に覆う被覆相として存在し、残り
のＺｒＯ2 および／または安定化ＺｒＯ2 が粒状分散相
として存在する組織をもつようになり、この結果のＡｌ
2 Ｏ3 基セラミックスは、前記被覆相を構成するＺｒＯ
2 および／または安定化ＺｒＯ2 の割合が、ＺｒＯ2 お
よび／または安定化ＺｒＯ2 に占める割合で５〜５０％
である場合、すぐれた耐熱塑性変形性を具備するように
なり、したがってこれを高い発熱を伴なう、例えば鋼の
高速切削や重切削に切削工具として用いた場合にも、切
刃が熱変形を起すことが著しく抑制されるようになり、
すぐれた切削性能を長期に亘って発揮するという研究結
果を得たのである。Therefore, the present inventors have
From the above viewpoint, Al with excellent heat plastic deformation
In order to develop 2 O 3 -based ceramics, the above-mentioned conventional A
As a result of conducting research focusing on l 2 O 3 -based ceramics,
The conventional Al 2 O 3 -based ceramics described above include Al 2 O 3 powder as a raw material powder, ZrO 2 and / or Y
2 O 3 , MgO, and CeO 2 are used as a raw material powder, using a stabilizing ZrO 2 powder obtained by solid-dissolving a stabilizing aid containing at least one of 0.1 to 20 mol%. It is produced by blending in a predetermined ratio, pulverizing and mixing in a ball mill, and hot pressing the resulting mixed powder. In addition to the above raw material powder, for example, sol gel on the surface of Al 2 O 3 powder. By the method, first, ZrO 2 and / or stabilized ZrO 2 is coated in a layered manner to a predetermined thickness, and Al is further applied on the layer for the purpose of ensuring good sinterability.
Using a double-coated Al 2 O 3 powder formed by coating a layer of 2 O 3 also at a predetermined thickness, are blended raw material powders in a predetermined ratio, mixed powder mixture comprising a hot-pressing it When producing Al 2 O 3 based ceramic material by, in the conventional Al 2 O 3 based ceramic material, those ZrO 2 and / or stabilized ZrO 2 grains of granular were those having dispersed distribution organization, ZrO 2 And / or a part of the stabilized ZrO 2 exists as a coating phase that partially or entirely covers the surface of the Al 2 O 3 crystal grains, and the remaining ZrO 2 and / or the stabilized ZrO 2 are a granular dispersed phase. As a result, Al has a structure that exists as
2 O 3 -based ceramics are ZrO which constitutes the above-mentioned coating phase.
Ratio of 2 and / or stabilized ZrO 2 is 5-50% as a proportion of ZrO 2 and / or stabilized ZrO 2
If the cutting edge is used as a cutting tool for high-speed cutting or heavy cutting of steel, for example, the cutting edge undergoes thermal deformation. Is caused to be significantly suppressed,
We have obtained research results that show excellent cutting performance over a long period of time.
【０００５】この発明は、上記の研究結果にもとづいて
なされたものであって、ＺｒＯ2 および／または安定化
ＺｒＯ2 を５〜５０％含有し、残りが実質的にＡｌ2 Ｏ
3 からなる組成を有するＡｌ2 Ｏ3 基セラミックスにお
いて、上記ＺｒＯ2 および／または安定化ＺｒＯ2 のう
ちの５〜５０％を、Ａｌ2 Ｏ3 結晶粒の表面を部分的あ
るいは全面部に覆う被覆相として存在させ、残りのＺｒ
Ｏ2 および／または安定化ＺｒＯ2 を粒状分散相として
存在させた組織をもつものとすることにより耐熱塑性変
形性を向上させたＡｌ2 Ｏ3 基セラミックスに特徴を有
するものである。[0005] This invention was made based on the above findings, the ZrO 2 and / or stabilized ZrO 2 containing 5-50%, the remainder substantially Al 2 O
In an Al 2 O 3 -based ceramics having a composition of 3 , a coating that covers 5 to 50% of the above ZrO 2 and / or stabilized ZrO 2 partially or entirely on the surface of Al 2 O 3 crystal grains Existing as a phase and the remaining Zr
It is characterized by the Al 2 O 3 -based ceramics having improved heat plastic deformation resistance by having a structure in which O 2 and / or stabilized ZrO 2 exist as a granular dispersed phase.
【０００６】なお、この発明のＡｌ2 Ｏ3 基セラミック
スにおいて、ＺｒＯ2 および／または安定化ＺｒＯ2 の
含有割合を５〜５０％と定めたのは、その割合が５％未
満では所望の高強度および高靭性を確保することができ
ず、一方その割合が５０％を越えると、硬さが急激に低
下し、著しい耐摩耗性低下をきたすという理由によるも
のである。In the Al 2 O 3 -based ceramics of the present invention, the content ratio of ZrO 2 and / or stabilized ZrO 2 is determined to be 5 to 50% because when the ratio is less than 5%, the desired high strength is obtained. In addition, it is not possible to secure high toughness. On the other hand, if the ratio exceeds 50%, the hardness sharply decreases and the wear resistance significantly decreases.
【０００７】また、この発明のＡｌ2 Ｏ3 基セラミック
スにおいて、被覆相を構成するＺｒＯ2 および／または
安定化ＺｒＯ2 の割合を、ＺｒＯ2 および／または安定
化ＺｒＯ2 に占める割合で５〜５０％としたのは、その
割合が５％未満では所望の顕著な耐熱塑性変形性向上効
果が得られず、一方その割合が５０％を越えても耐熱塑
性変形性により一層の向上効果は得られないという理由
にもとづくものである。Further, in the Al 2 O 3 based ceramic material of the present invention, the proportion of ZrO 2 and / or stabilized ZrO 2 constituting the coating phase, a proportion of ZrO 2 and / or stabilized ZrO 2 5 to 50 When the ratio is less than 5%, the desired remarkable effect of improving the heat plastic deformation is not obtained. On the other hand, when the ratio exceeds 50%, the further improvement effect is obtained by the heat plastic deformability. It is based on the reason that it does not exist.
【０００８】[0008]
【実施例】つぎに、この発明のＡｌ2 Ｏ3 基セラミック
スを実施例により具体的に説明する。まず、原料粉末と
して、いずれも０．０２〜７μｍの範囲内の所定の平均
粒径を有するＡｌ2 Ｏ3 粉末、ＺｒＯ2 粉末、並びにＹ
2 Ｏ3 ：５モル％含有の安定化ＺｒＯ2 （以下、安定化
ＺｒＯ2 （ａ）という）粉末、ＭｇＯ：８モル％含有の
安定化ＺｒＯ2 （以下、安定化ＺｒＯ2 （ｂ）という）
粉末、およびＣｅＯ2：１２モル％含有の安定化ＺｒＯ
2 （以下、安定化ＺｒＯ2 （ｃ）という）粉末を用意
し、さらに前記Ａｌ2 Ｏ3 粉末のうちの比較的粗粒粉末
の表面を、通常のゾルゲル法を用いて、ＺｒＯ2 および
／または上記安定化ＺｒＯ2 （ａ）〜（ｃ）粉末と同じ
組成を有する安定化ＺｒＯ2 にて所定厚さ被覆し、引続
いてその上にさらにＡｌ2 Ｏ3 を所定厚さ被覆してなる
表面被覆Ａｌ2 Ｏ3 粉末を用意し、これら原料粉末を所
定の配合割合に配合し、ボールミルで所定時間混合し、
この混合粉末をＩＳＯ・ＣＮＭＧ１２０４０８の切削チ
ップ形状に則した圧粉体に５ton ／cm2 の圧力でブレス
成形し、ついで前記圧粉体に、大気中、１０℃／minの
平均昇温速度で１３４０〜１４５０℃の範囲内の所定温
度に加熱し、この温度に１時間保持の条件で焼結を施
し、引続いてＡｒ雰囲気中、１３００〜１４００℃の温
度に２時間保持の条件でＨＩＰ処理を施すことにより、
表１〜３に示される組成割合をもった本発明Ａｌ2 Ｏ3
基セラミックス（以下、本発明セラミックスという）１
〜１５、および従来Ａｌ2 Ｏ3 基セラミックス（以下、
従来セラミックスという）１〜１５を製造した。EXAMPLES Next, the Al 2 O 3 -based ceramics of the present invention will be specifically described by way of examples. First, as raw material powders, Al 2 O 3 powder, ZrO 2 powder, and Y each having a predetermined average particle diameter within the range of 0.02 to 7 μm
2 O 3 : 5 mol% stabilized ZrO 2 (hereinafter referred to as stabilized ZrO 2 (a)) powder, MgO: 8 mol% stabilized ZrO 2 (hereinafter referred to as stabilized ZrO 2 (b))
Powder and stabilized ZrO containing CeO 2 : 12 mol%
2 (hereinafter referred to as stabilized ZrO 2 (c)) powder is prepared, and the surface of the relatively coarse grained powder of the Al 2 O 3 powder is subjected to ZrO 2 and / or A surface obtained by coating the stabilized ZrO 2 (a) to (c) powder with a predetermined thickness of the stabilized ZrO 2 having the same composition as that of the powder, and subsequently further coating with a predetermined thickness of Al 2 O 3 thereon. A coated Al 2 O 3 powder is prepared, these raw material powders are mixed in a predetermined mixing ratio, and mixed for a predetermined time in a ball mill,
This mixed powder is press-molded into a green compact conforming to the cutting tip shape of ISO / CNMG120408 at a pressure of 5 ton / cm 2 , and then the green compact is 1340 at an average heating rate of 10 ° C./min in the atmosphere. To a predetermined temperature in the range of ˜1450 ° C., sintering is carried out under the condition of holding this temperature for 1 hour, and subsequently, HIP treatment is carried out under the condition of holding the temperature of 1300 to 1400 ° C. for 2 hours in Ar atmosphere. By applying
Inventive Al 2 O 3 having composition ratios shown in Tables 1 to 3
Base ceramics (hereinafter referred to as the present ceramics) 1
~ 15, and conventional Al 2 O 3 -based ceramics (hereinafter,
Conventional ceramics) 1 to 15 were manufactured.
【０００９】つぎに、この結果得られた各種のセラミッ
クスについて、いずれも耐熱塑性変形性を評価する目的
で、切削工具として用い、 被削材：Ｓ４５Ｃ、 切削速度：６００ｍ／min 、 送り：０２mm／rev.、 切込み：０．８mm、 切削時間：２０分、 の条件での鋼の乾式高速連続切削試験、 被削材：ＳＮＣＭ：４４０、 切削速度：３５０ｍ／min 、 送り：０．４ｌmm／rev ．、 切込み：１．５mm、 切削時間：５分 の条件での鋼の乾式高送り連続切削試験を行ない、切刃
の逃げ面摩耗幅を測定した。これらの測定結果を表１〜
３に示した。Next, each of the various ceramics obtained as a result was used as a cutting tool for the purpose of evaluating the heat plastic deformation property. Work material: S45C, cutting speed: 600 m / min, feed: 02 mm / rev., depth of cut: 0.8 mm, cutting time: 20 minutes, dry high speed continuous cutting test of steel, work material: SNCM: 440, cutting speed: 350 m / min, feed: 0.4 lmm / rev. The depth of wear of the flank of the cutting edge was measured by performing a dry high feed continuous cutting test of steel under the conditions of depth of cut: 1.5 mm, cutting time: 5 minutes. Table 1 shows these measurement results.
Shown in 3.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【表２】 [Table 2]
【００１２】[0012]
【表３】 [Table 3]
【００１３】さらに、図１には本発明セラミックス２、
図２には従来セラミックス２の電子顕微鏡による組織写
真（倍率：３万倍）をそれぞれ示した。Further, FIG. 1 shows the ceramic 2 of the present invention,
FIG. 2 shows a structure photograph of the conventional ceramics 2 by an electron microscope (magnification: 30,000 times).
【００１４】[0014]
【発明の効果】図１，２に示される通り、本発明セラミ
ックス１〜１５は、ＺｒＯ2 および／または安定化Ｚｒ
Ｏ2 のうちの一部が、Ａｌ2 Ｏ3 結晶粒の表面を部分的
あるいは全面的に覆う被覆相として存在し、残りのＺｒ
Ｏ2 および／または安定化ＺｒＯ2 が粒状分散相として
存在する組織をもつのに対して、従来セラミックス１〜
１５は、粒状のＺｒＯ2 および／または安定化ＺｒＯ2
結晶粒が分散分布した組織をもつ点で両者は組織上相異
するものであり、この組織上の相異が表１〜３に示され
る通り高い発熱を伴なう高速切削試験および高送り切削
試験結果に現われており、本発明セラミックス１〜１５
は、切刃に熱変形の発生なく、長期に亘ってすぐれた切
削性能を発揮するのに対して、従来セラミックス１〜１
５は相対的に短時間の切削で切刃に熱変形が発生し、使
用寿命に至ることが示されている。As shown in FIGS. 1 and 2, the ceramics 1 to 15 of the present invention contain ZrO 2 and / or stabilized Zr.
Part of O 2 exists as a coating phase that partially or entirely covers the surface of Al 2 O 3 crystal grains, and the remaining Zr
While O 2 and / or stabilized ZrO 2 have a structure that exists as a granular dispersed phase, conventional ceramics 1 to
15 is granular ZrO 2 and / or stabilized ZrO 2
Both are structurally different in that they have a structure in which crystal grains are dispersed and distributed. As shown in Tables 1 to 3, these structural differences are high-speed cutting tests and high-feed cutting with high heat generation. It appears in the test results, and the present ceramics 1 to 15
Has excellent cutting performance over a long period of time without thermal deformation of the cutting edge, while conventional ceramics 1-1.
No. 5 shows that the cutting edge is thermally deformed by a relatively short time cutting and reaches the end of its useful life.
【００１５】上述のように、この発明のＡｌ2 Ｏ3 基セ
ラミックスは、すぐれた耐熱塑性変形性を有するので、
例えば高い熱発生を伴なう鋼の高速切削や、高送りおよ
び高切込みなどの重切削に切削工具として適用した場合
に、著しく長期に亘ってすぐれた切削性能を発揮するな
ど工業上有用な特性を有するのである。As described above, since the Al 2 O 3 -based ceramics of the present invention has excellent heat plastic deformation,
Industrially useful characteristics such as excellent cutting performance over a long period of time when used as a cutting tool for high-speed cutting of steel with high heat generation and heavy cutting such as high feed and high depth of cut Have.
【図１】本発明セラミックス２の電子顕微鏡による組織
写真（倍率：３万倍）である。FIG. 1 is an electron micrograph of a ceramic of the present invention 2 (magnification: 30,000 times).
【図２】従来セラミックス２の電子顕微鏡による組織写
真（倍率：３万倍）である。FIG. 2 is an electron microscopic photograph of conventional ceramics 2 (magnification: 30,000 times).
Claims (1)
たは安定化酸化ジルコニウムを５〜５０％含有し、残り
が実質的に酸化アルミニウムからなる組成を有する酸化
アルミニウム基セラミックスにおいて、 上記酸化ジルコニウムおよび／または安定化酸化ジルコ
ニウムのうちの５〜５０％が、酸化アルミニウム結晶粒
の表面を部分的あるいは全面的に覆う被覆相として存在
し、 残りの酸化ジルコニウムおよび／または安定化酸化ジル
コニウムが粒状分散相として存在する組織、を有するこ
とを特徴とする耐熱塑性変形性のすぐれた酸化アルミニ
ウム基セラミックス。1. An aluminum oxide-based ceramic having a composition containing 5 to 50% by weight of zirconium oxide and / or stabilized zirconium oxide, and the balance substantially consisting of aluminum oxide, wherein said zirconium oxide and / or 5 to 50% of the stabilized zirconium oxide exists as a coating phase that partially or entirely covers the surface of the aluminum oxide crystal grains, and the remaining zirconium oxide and / or the stabilized zirconium oxide exists as a granular dispersed phase. An aluminum oxide-based ceramic excellent in heat plastic deformation, characterized by having a structure that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5044588A JPH06234566A (en) | 1993-02-09 | 1993-02-09 | Aluminum oxide-based ceramics excellent in resistance to thermal plastic deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5044588A JPH06234566A (en) | 1993-02-09 | 1993-02-09 | Aluminum oxide-based ceramics excellent in resistance to thermal plastic deformation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06234566A true JPH06234566A (en) | 1994-08-23 |
Family
ID=12695643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5044588A Pending JPH06234566A (en) | 1993-02-09 | 1993-02-09 | Aluminum oxide-based ceramics excellent in resistance to thermal plastic deformation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06234566A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013032265A (en) * | 2011-07-01 | 2013-02-14 | Maruwa Co Ltd | Alumina zirconia sintered board for semiconductor device and manufacturing method therefor |
| JP2013053020A (en) * | 2011-09-01 | 2013-03-21 | Ritsumeikan | Composite ceramics and method for producing the same |
-
1993
- 1993-02-09 JP JP5044588A patent/JPH06234566A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013032265A (en) * | 2011-07-01 | 2013-02-14 | Maruwa Co Ltd | Alumina zirconia sintered board for semiconductor device and manufacturing method therefor |
| JP2013053020A (en) * | 2011-09-01 | 2013-03-21 | Ritsumeikan | Composite ceramics and method for producing the same |
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