CN101456272A - 涂覆切削刀片 - Google Patents

涂覆切削刀片 Download PDF

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CN101456272A
CN101456272A CNA2008102470928A CN200810247092A CN101456272A CN 101456272 A CN101456272 A CN 101456272A CN A2008102470928 A CNA2008102470928 A CN A2008102470928A CN 200810247092 A CN200810247092 A CN 200810247092A CN 101456272 A CN101456272 A CN 101456272A
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cutting tool
coated cutting
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汤米·拉尔森
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Seco Tools AB
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Seco Tools AB
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/20—Metallic material, boron or silicon on organic substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/148—Composition of the cutting inserts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0641—Nitrides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08—Oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08—Oxides
    • C23C14/081—Oxides of aluminium, magnesium or beryllium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/24—Vacuum evaporation
    • C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
    • C23C14/325—Electric arc evaporation
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/27—Cutters, for shaping comprising tool of specific chemical composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y10T409/303808—Process including infeeding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y10T428/24967—Absolute thicknesses specified
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y10T428/24967—Absolute thicknesses specified
    • Y10T428/24975—No layer or component greater than 5 mils thick
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Physical Vapour Deposition (AREA)
  • Drilling Tools (AREA)

Abstract

本发明涉及一种涂覆的硬质合金刀片(切削工具)，尤其用于湿法或干法加工钢和不锈钢。该切削工具刀片的特征在于：硬质合金基底和涂层，该涂层包括0.5～5微米厚的(Ti，Al)N最内层和1～5微米厚的(Al，Cr)2O3层。

Description

涂覆切削刀片
技术领域
本发明涉及涂覆的硬质合金刀片(切削工具)，该刀片尤其用于湿法或干法加工钢和不锈钢。
背景技术
当用硬质合金工具加工低度合金化和中度合金化的钢和不锈钢时，根据不同磨损机理，诸如化学磨损、磨粒磨损和粘着磨损，以及由于沿切削刃口产生的裂纹导致切削刃口碎落，切削刃口被磨损。通过应用确定何种磨损机理占主要地位，并且这取决于被加工材料的性质、应用的切削参数和工具材料的性质。通常，同时提高所有的工具性能是非常困难的，而且，商用硬质合金等级常常是相对于一种或多种上述磨损方式被最优化，并且因此被最优化地用于特定的应用领域。
WO 2007/069973公开了一种涂覆的切削工具刀片，该刀片对于干法和湿法加工(特别是铣削)具有或不具有粗糙表面区域的低度合金化和中度合金化的钢、不锈钢特别有用。该刀片特征在于WC-TaC-NbC-Co硬质合金和涂层，该硬质合金含有W合金的Co粘结相，该涂层包括柱状晶粒的TiCxNyOz最内层和至少在前刀面上的光滑α-Al2O3顶层。
US 5879823公开了一种涂覆的切削工具，该工具具有通过PVD施加的(Ti，Al)N层和在该(Ti，Al)N层顶部通过PVD施加的氧化铝层。
US 5310607公开了一种硬涂层，该硬涂层主要包括(Al，Cr)2O3晶体和大于5原子％的铬组分，其中(Al，Cr)2O3是单晶。在低于或等于500℃温度下沉积该涂层。该硬涂层通过CVD或PVD工艺沉积。
发明内容
本发明的一个目的是提供一种具有增强性能的用于加工钢和不锈钢的涂覆切削工具。
根据本发明的切削工具刀片包括具有耐磨涂层的硬质合金基底，该涂层包括(Ti，Al)N的第一最内层和(Al，Cr)2O3的第二层。
附图说明
图1是根据本发明的硬质合金刀片的断裂横截面的20000倍的扫描电镜图，其中
1.硬质合金基底，
2.最内(Ti，Al)N层和
3.(Al，Cr)2O3层。
沉积在硬质合金基底上的涂层包括：
-具有柱状晶粒的Ti1-xAlxN第一(最内)层，其中0.25≤x≤0.7，优选x>0.4，更优选x>0.6，该层的总厚度在0.5与5微米之间，优选在1与4微米之间。
-具有柱状晶粒的(Al1-yCry)2O3层，其中0.1≤y≤0.6，优选0.3≤y≤0.55，最优选y＝0.5，该层的厚度为1～5微米，优选1.5～4.5微米，最优选2～4微米。
在另一替代性实施方式中，在(Al，Cr)2O3层顶部上有一厚度小于1微米的薄TiN层。
在本发明的第一实施方式中，该硬质合金基底的成分为：9.3～10.9wt％的Co，优选为9.75～10.7wt％的Co，最优选为9.9～10.5wt％的Co；Ti、Nb和Ta的总重为0.5～2.5wt％，优选为1.0～2.0wt％，最优选为1.2～1.8wt％，并且余量为WC。Ti、Ta和/或Nb也可部分或全部被元素周期表中IVb，Vb或VIb族的其他元素代替。Ti的含量优选在相应于技术意义上杂质的水平。优选的是，Ta与Nb的重量浓度比为7.0～12.0，优选7.6～11.4，最优选8.2～10.5。该硬质合金的矫顽力(Hc)为10～15kA/m，优选11～14kA/m，最优选11.5～13.5kA/m。
在本发明的第二实施例中，硬质合金基底的成分为：4.7～5.9wt％的Co，优选为4.9～5.6wt％的Co，最优选为5.0～5.5wt％的Co；Ti、Nb和Ta的总重为5.0～10.0wt％，优选6.0～9.0wt％，最优选7.0～8.0wt％，并且余量为WC。Ti、Ta和/或Nb也可部分或全部被元素周期表中IVb，Vb或VIb族的其他元素代替。优选的是，Ta与Nb的重量浓度比为1.0～5.0，优选1.5～4.5。该硬质合金的矫顽力(Hc)为11～17kA/m，优选12～16kA/m，最优选13～15kA/m。
根据本发明的切削刀片通过粉末冶金技术制得，即湿法研磨粉末形成硬组分和粘结相，压制该研磨的混合物为具有期望形状和尺寸的物体，并且烧结，其包括具有根据上述组成的硬质合金基底，以及包含(Ti，Al)N层和(Al，Cr)2O3层的涂层。
使用已知技术电弧沉积(Ti，Al)N层。根据US 2007/0000772中的实施例1沉积(Al，Cr)2O3层。
在本发明的另一实施方式中，使用已知技术在(Al，Cr)2O3层上沉积一小于1微米的薄TiN顶层。
在另一优选的实施方法中，前述的切削工具刀片在涂覆后用湿喷砂或刷涂处理，使得该涂覆的工具的表面性能提高。
本发明还涉及根据上述的切削工具刀片在湿法或干法铣削钢和不锈钢中的用途，其中切削速度为75～600m/分钟，优选为150～500m/分钟，在铣削情况下，根据切削速度和刀片几何形状，平均进刀为每齿0.08～0.5mm，优选0.1～0.4mm。
具体实施方式
实施例1
等级A：硬质合金基底的成分为：10.3wt％的Co，1.35wt％的Ta，0.15wt％的Nb，以及余量为WC，通过传统的研磨粉末、压制压坯，并且然后在1430℃下烧结而制备出来。该硬质合金的Hc值为12.5kA/m，表示平均截距长度为大约0.7微米。根据已知的电弧蒸发技术，用包含柱状晶粒的3.0微米厚的(Ti0.5Al0.5)N层，以及根据US 2007/0000772实施例1沉积的2.9微米厚的柱状(Al0.5Cr0.5)2O3层涂覆该基底。图1为该涂覆的硬质合金的断裂横截面的20000倍的扫描电镜图。
实施例2
等级B：重复实施例1，使用的硬质合金基底的组成为：5.3wt％的Co，2.0wt％的Ti，3.4wt％的Ta，2.0wt％的Nb，以及余量为WC。该硬质合金的Hc值为13.8kA/m。
实施例3
等级C：采用已知的电弧蒸发技术将6.0微米厚的Ti0.33Al0.67N层沉积在根据实施例1和2的基底上。
实施例4
在加工钢时测试等级A和C。
 
操作 端面铣削
刀具直径 125mm
材料 SS1672
刀片类型 SEEX1204AFTN-M15
切削速度 300m/分钟
进刀 0.2mm/齿
切削深度 2.5mm
切削宽度 120mm
 
结果 工具寿命(分钟)
等级A(根据本发明的等级) 10
等级C 8
该测试在相同的最大后刀面磨损时停止。在具有根据本发明的等级下，耐磨性大大提高。
实施例5
在加工不锈钢时测试等级A和C。
 
操作 肩台铣削
刀具直径 32mm
材料 SS1672
刀片类型 XOEX120408-M07
切削速度 275m/分钟
进刀 0.25mm/齿
切削深度 3mm
切削宽度 8.8mm
 
结果 工具寿命(分钟)
等级A(根据本发明的等级) 8
等级C 5
该测试在相同的最大后刀面磨损时停止。在具有根据本发明的等级下，耐磨性大大提高。
实施例6
在加工不锈钢时测试等级B和C。
 
操作 间歇车削
材料 SS2348
刀片类型 CNMG120408-MR3
切削速度 80m/分钟
进刀 0.3mm
切削深度 2mm
 
结果 工具寿命(循环)
等级B(根据本发明的等级) 5
等级C 3
该测试在相同的最大后刀面磨损时停止。在具有根据本发明的等级下，耐磨性大大提高。
实施例7
在加工钢时测试等级B和C。
 
操作 间歇车削
材料 SS1672
刀片类型 CNMG120408-MR3
切削速度 400m/分钟
进刀 0.3mm
切削深度 2mm
 
结果 工具寿命(分钟)
等级B(根据本发明的等级) 13
等级C 10
该测试在相同的最大后刀面磨损时停止。在具有根据本发明的等级下，耐磨性大大提高。

Claims (5)

1.一种切削工具刀片，其包括硬质合金基底和涂层，对于湿法或干法加工钢和不锈钢特别有用，其特征在于所述涂层包括：
- 具有柱状晶粒的Ti1-xAlxN第一(最内)层，其中0.25≤x≤0.7，优选x>0.4，更优选x>0.6，该层的总厚度在0.5与5微米之间，优选在1与4微米之间。
- 具有柱状晶粒的(Al1-yCry)2O3层，其中0.1≤y≤0.6，优选0.3≤y≤0.55，最优选y＝0.5，该层的厚度为1～5微米，优选1.5～4.5微米，最优选2～4微米。
2.如权利要求1所述的切削工具刀片，其特征在于所述基底的成分为：9.3～10.9wt％的Co，优选为9.75～10.7wt％的Co；总重为0.5～2.5wt％、优选为1.0～2.0wt％的金属Nb和Ta的立方碳化物；以及余量的WC，矫顽力为10～15kA/m，优选为11～14kA/m，并且优选的是，Ta与Nb的重量浓度比为7.0～12.0，优选为7.6～11.4。
3.如权利要求1所述的切削工具刀片，其特征在于所述基底的成分为：4.7～5.9wt％的Co，优选为4.9～5.6wt％的Co，最优选为5.0～5.5wt％的Co；总重为5.0～10.0wt％，优选为6.0～9.0wt％，最优选为7.0～8.0wt％的金属Ti、Nb和Ta；以及余量的WC，矫顽力为11～17kA/m，优选为12～16kA/m，最优选为13～15kA/m，并且优选的是，Ta与Nb的重量浓度比为1.0～5.0，更优选为1.5～4.5。
4.上述权利要求中任一项所述的切削工具刀片，其特征在于有一薄TiN顶层在(Al1-yCry)2O3层上。
5.如权利要求1～4所述的切削工具刀片在加工不锈钢和钢中的用途，其中切削速度为75～600m/分钟，优选为150～500m/分钟，在铣削情况下，根据切削速度和刀片几何形状，平均进刀为每齿0.08～0.5mm，优选为0.1～0.4mm。
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