JPH06262407A - Cutting tool made of cemented carbide of surface coated tungsten carbide base excellent in chipping resistance - Google Patents
Cutting tool made of cemented carbide of surface coated tungsten carbide base excellent in chipping resistanceInfo
- Publication number
- JPH06262407A JPH06262407A JP8135893A JP8135893A JPH06262407A JP H06262407 A JPH06262407 A JP H06262407A JP 8135893 A JP8135893 A JP 8135893A JP 8135893 A JP8135893 A JP 8135893A JP H06262407 A JPH06262407 A JP H06262407A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- cutting
- cemented carbide
- layer thickness
- cutting tool
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、例えば鋼などの断続
切削において、特に低切込み切削ですぐれた耐欠損性を
発揮する表面被覆炭化タングステン（以下、ＷＣで示
す）基超硬合金製切削工具に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-coated tungsten carbide (hereinafter referred to as WC) -based cemented carbide cutting tool which exhibits excellent fracture resistance particularly in low-cut cutting, for example, in interrupted cutting of steel. It is about.
【０００２】[0002]
【従来の技術】従来、一般に、例えば特開昭５３−１３
１９０９号公報、特開昭６２−１０５６２８号公報、お
よび特開平１−１３９７０３号公報などに記載されるよ
うに、Ｃｏおよび／またはＮｉを主成分とする金属結合
相：５〜２０重量％を含有し、残りがＷＣを主成分とす
る硬質分散相からなるＷＣ基超硬合金で構成され、かつ
表面部における切刃のホーニング部を除いた逃げ面とす
くい面部に、３〜６０μｍの平均層厚で上記金属結合相
の濃度が中心部に比して相対的に高い表面軟化層を有す
る基体の表面に、Ｔｉの炭化物、窒化物、炭窒化物、炭
酸化物、および炭窒酸化物、並びに酸化アルミニウム
（以下、それぞれＴｉＣ、ＴｉＮ、ＴｉＣＮ、ＴｉＣ
Ｏ、ＴｉＣＮＯ、およびＡｌ2 Ｏ3 で示す）のうちの１
種の単層または２種以上の複層からなる硬質被覆層を５
〜２０μｍの平均層厚で形成してなる表面被覆ＷＣ基超
硬合金製切削工具が知られており、これが例えば鋼の連
続切削や断続切削に用いられることも知られている。2. Description of the Related Art Conventionally, generally, for example, JP-A-53-13.
1909, JP-A-62-105628, JP-A-1-139703 and the like, a metal binder phase containing Co and / or Ni as a main component: containing 5 to 20% by weight However, the rest is composed of a WC-based cemented carbide consisting of a hard dispersed phase containing WC as a main component, and the flank and the rake face excluding the honing part of the cutting edge in the surface part have an average layer thickness of 3 to 60 μm. At the surface of the substrate having the surface softening layer in which the concentration of the metal binder phase is relatively higher than that in the central part, Ti carbide, nitride, carbonitride, carbon oxide, and carbonitride oxide, and oxidation Aluminum (hereinafter, TiC, TiN, TiCN, TiC, respectively)
O, TiCNO, and Al 2 O 3 )
A hard coating layer consisting of a single layer of one kind or a multilayer of two or more kinds
Surface-coated WC-based cemented carbide cutting tools formed with an average layer thickness of ˜20 μm are known, and they are also known to be used for continuous cutting and interrupted cutting of steel, for example.
【０００３】さらに、上記の従来表面被覆ＷＣ基超硬合
金が、真空焼結法により表面部に平均層厚で３〜６０μ
ｍの一様の厚さの表面軟化層を有するＷＣ基超硬合金基
体を形成し、これの切刃の逃げ面とすくい面の交わる部
分を通常０．０３〜０．１mmの幅でホーニング加工して
ホーニング部を形成し、この状態で化学蒸着法または物
理蒸着法を用い、通常の条件で硬質被覆層を５〜２０μ
ｍの平均層厚で形成することにより製造されることも知
られている。Further, the above conventional surface-coated WC-based cemented carbide has a mean layer thickness of 3 to 60 μm on the surface by vacuum sintering.
A WC-based cemented carbide substrate having a surface softening layer with a uniform thickness of m is formed, and the intersection of the flank of the cutting edge with the rake face is usually honed with a width of 0.03 to 0.1 mm. To form a honing portion, and in this state, a chemical vapor deposition method or a physical vapor deposition method is used to form a hard coating layer of 5 to 20 μm under normal conditions.
It is also known to be manufactured by forming with an average layer thickness of m.
【０００４】[0004]
【発明が解決しようとする課題】一方、近年の切削加工
のＦＡ化および省力化はめざましく、これに伴ない、切
削工具にもなるべく切削条件に制限を受けない汎用性が
求められる傾向にあるが、上記の従来表面被覆ＷＣ基超
硬合金製切削工具は、通常の条件での連続切削や、切込
みが１mm以上の通常の条件での断続切削にはすぐれた切
削性能を発揮するものの、切込みが０．５mm程度以下の
低切込み断続切削になると、切刃に欠損やチッピング
（微小欠け）が発生し易く、比較的短時間で使用寿命に
至るものであり、必ずしも満足する汎用性を具備してい
ないのが現状である。On the other hand, in recent years FA cutting and labor saving have been remarkable in recent years, and along with this, there is a tendency that cutting tools are required to have versatility as much as possible without being restricted by cutting conditions. Although the above-mentioned conventional surface-coated WC-based cemented carbide cutting tool exhibits excellent cutting performance in continuous cutting under normal conditions and intermittent cutting under normal conditions with a depth of cut of 1 mm or more, When cutting with a low depth of cut of about 0.5 mm or less, chipping or chipping (fine chipping) is likely to occur on the cutting edge, leading to a service life in a relatively short time, and it is always equipped with satisfactory versatility. The current situation is that there are none.
【０００５】[0005]
【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、特に低切込みの断続切削ですぐ
れた耐欠損性を示す表面被覆ＷＣ基超硬合金製切削工具
を開発すべく、上記の従来表面被覆ＷＣ基超硬合金に着
目し研究を行なった結果、上記硬質被覆層形成前にして
ホーニング加工後のＷＣ基超硬合金基体、すなわち切刃
のホーニング部に実質的に表面軟化層は存在せず、切刃
の逃げ面とすくい面に平均層厚で１２〜３０μｍの表面
軟化層が存在する基体に、軟化層形成熱処理を施して、
前記ホーニング部に平均層厚で３〜１０μｍの表面軟化
層を形成し、同時に前記逃げ面とすくい面における平均
層厚で１２〜３０μｍであった表面軟化層を同１５〜４
０μｍに増加させ、この状態の基体に化学蒸着法または
物理蒸着法により上記硬質被覆層を形成すると、この結
果の表面被覆ＷＣ基超硬合金製切削工具は、通常の条件
での連続切削や断続切削は勿論のこと、特に切込みが
０．５mm以下の低切込み断続切削でもすぐれた切削性能
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 viewpoints, in order to develop a cutting tool made of a surface-coated WC-based cemented carbide, which exhibits excellent fracture resistance especially in intermittent cutting with a low depth of cut, research is conducted by focusing on the conventional surface-coated WC-based cemented carbide. As a result, the WC-based cemented carbide substrate after the honing process before forming the hard coating layer, that is, the honing portion of the cutting edge has substantially no surface softening layer, and the flank surface and the rake surface of the cutting edge. The substrate having a surface softening layer having an average layer thickness of 12 to 30 μm is subjected to a softening layer forming heat treatment,
A surface softening layer having an average layer thickness of 3 to 10 μm was formed on the honing portion, and at the same time, a surface softening layer having an average layer thickness of 12 to 30 μm on the flank and the rake face was formed at 15 to 4
When the hard coating layer is formed on the substrate in this state by a chemical vapor deposition method or a physical vapor deposition method, the resulting surface-coated WC-based cemented carbide cutting tool is continuously cut or interrupted under normal conditions. The research results show that excellent cutting performance is exhibited for a long period of time not only in cutting but also in low-cut intermittent cutting with a depth of cut of 0.5 mm or less.
【０００６】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、Ｃｏおよび／またはＮｉを主成
分とする金属結合相：５〜２０重量％を含有し、残りが
ＷＣを主成分とする硬質分散相からなるＷＣ基超硬合金
で構成され、かつ表面部に上記金属結合相の濃度が中心
部に比して相対的に高い表面軟化層を有する基体の表面
に、ＴｉＣ、ＴｉＮ、ＴｉＣＮ、ＴｉＣＯ、ＴｉＣＮ
Ｏ、およびＡｌ2 Ｏ3 のうちの１種の単層または２種以
上の複層からなる硬質被覆層を５〜２０μｍの平均層厚
で形成してなる表面被覆ＷＣ基超硬合金製切削工具にお
いて、切刃の逃げ面およびすくい面における上記表面軟
化層の平均層厚を１５〜４０μｍとし、前記逃げ面とす
くい面の交わるホーニング部の上記表面軟化層の平均層
厚を３〜１０μｍとすることにより、通常の条件での連
続切削や断続切削は勿論のこと、特に鋼などの低切込み
断続切削でもすぐれた耐欠損性を発揮する表面被覆ＷＣ
基超硬合金製切削工具に特徴を有するものである。The present invention has been made based on the above-mentioned research results, and contains a metallic binder phase containing Co and / or Ni as a main component: 5 to 20% by weight, and the rest containing WC as a main component. On the surface of a substrate which is composed of a WC-based cemented carbide consisting of a hard dispersed phase and has a surface softening layer in which the concentration of the metal binding phase is relatively higher than that in the central portion, TiC, TiN , TiCN, TiCO, TiCN
Surface-coated WC-based cemented carbide cutting tool formed by forming a hard coating layer consisting of a single layer of O and Al 2 O 3 or a multilayer of two or more layers with an average layer thickness of 5 to 20 μm In, the average layer thickness of the surface softening layer on the flank and rake face of the cutting edge is 15 to 40 μm, and the average layer thickness of the surface softening layer on the honing portion where the flank and rake face intersect is 3 to 10 μm. As a result, surface coating WC that exhibits excellent fracture resistance not only in continuous cutting and interrupted cutting under normal conditions, but especially in low-cut interrupted cutting of steel, etc.
It is characterized by a cutting tool made of base cemented carbide.
【０００７】なお、この発明の切削工具おいて、これを
構成するＷＣ基超硬合金基体の金属結合相の含有量を５
〜２０重量％としたのは、その含有量が５重量％未満で
は所望の強度を確保することができず、一方その含有量
が２０重量％を越えると耐摩耗性が急激に低下するよう
になるという理由によるものであり、また同じく硬質被
覆層の平均層厚を５〜２０μｍと限定したのは、その平
均層厚が５μｍ未満では所望の耐摩耗性を確保すること
ができず、一方その平均層厚が２０μｍを越えると、切
刃に欠損やチッピングが発生し易くなるという理由から
である。In the cutting tool of the present invention, the content of the metal binder phase of the WC-based cemented carbide substrate constituting the cutting tool is 5
-20% by weight means that if the content is less than 5% by weight, the desired strength cannot be ensured, while if the content exceeds 20% by weight, the wear resistance sharply decreases. In addition, the reason why the average layer thickness of the hard coating layer is limited to 5 to 20 μm is that the desired abrasion resistance cannot be ensured when the average layer thickness is less than 5 μm. This is because if the average layer thickness exceeds 20 μm, the cutting edge is likely to be chipped or chipped.
【０００８】さらに、この発明の切削工具において、こ
れを構成するＷＣ基超硬合金基体の表面部に形成された
表面軟化層の平均層厚に関し、ホーニング部のそれを３
〜１０μｍとしたのは、その平均層厚が３μｍ未満では
低切込み断続切削で所望の耐欠損性向上効果が得られ
ず、一方その平均層厚が１０μｍを越えると耐熱塑性変
形性が急激に低下するようになるという理由からであ
り、また逃げ面とすくい面のそれを１５〜４０μｍと限
定したのは、その平均層厚が１５μｍ未満では所望のす
ぐれた耐欠損性を確保することができず、一方その平均
層厚が４０μｍを越えると同様に耐熱塑性変形性が低下
し、切刃が偏摩耗を起して、比較的短時間で使用寿命に
至るようになるという理由によるものである。Further, in the cutting tool of the present invention, regarding the average layer thickness of the surface softening layer formed on the surface portion of the WC-based cemented carbide substrate constituting the cutting tool, that of the honing portion is 3
When the average layer thickness is less than 3 μm, the desired effect of improving fracture resistance cannot be obtained in low-interruption intermittent cutting, while when the average layer thickness exceeds 10 μm, the thermal plastic deformation property is drastically reduced. The reason is that the flank face and the rake face are limited to 15 to 40 μm because if the average layer thickness is less than 15 μm, desired excellent fracture resistance cannot be secured. On the other hand, when the average layer thickness exceeds 40 μm, the heat plastic deformation is similarly deteriorated, the cutting edge causes uneven wear, and the service life is reached in a relatively short time.
【０００９】[0009]
【実施例】つぎに、この発明の切削工具を実施例により
具体的に説明する。原料粉末として、いずれも０．５〜
１０μｍの範囲内の所定の平均粒径を有するＷＣ粉末、
それぞれ表１に示される組成を有する各種の炭化物粉
末、窒化物粉末、および炭窒化物粉末、Ｃｏ粉末、およ
びＮｉ粉末を用意し、これら原料粉末を、表１に示され
る配合組成に配合し、ボールミルで湿式混合し、乾燥し
た後、１ton/cm2 の圧力で圧粉体にプレス成形し、この
圧粉体を、１０-2torrの真空中、温度：１４００℃に加
熱し、この温度に６０〜１２０分の範囲の所定時間保持
の条件で焼結することにより表面部に表１に示される平
均層厚の表面軟化層を有するＷＣ基超硬合金基体Ａ〜Ｈ
をそれぞれ製造した。EXAMPLES Next, the cutting tool of the present invention will be specifically described by way of examples. As raw material powder, 0.5-
A WC powder having a predetermined average particle size within the range of 10 μm,
Various carbide powders, nitride powders, carbonitride powders, Co powders, and Ni powders each having the composition shown in Table 1 were prepared, and these raw material powders were compounded in the compounding composition shown in Table 1, Wet-mix with a ball mill, dry and press-mold into a green compact at a pressure of 1 ton / cm 2 , and heat the green compact to a temperature of 1400 ° C. in a vacuum of 10 -2 torr. A WC-based cemented carbide substrate A to H having a surface softening layer having an average layer thickness shown in Table 1 on the surface by sintering under the condition of holding for a predetermined time in the range of 60 to 120 minutes.
Were manufactured respectively.
【００１０】ついで、上記の各種ＷＣ基超硬合金基体Ａ
〜Ｈに、０．０３〜０．１mmの範囲内の所定幅のホーニ
ング加工を施し、引続いて同じく１０-2torrの真空中、
温度：１４００℃に加熱し、この温度に１０〜３０分の
範囲内の所定温度保持の条件で軟化層形成熱処理を施し
て、切刃のホーニング部、逃げ面、およびすくい面にそ
れぞれ表２に示される平均層厚の表面軟化層を形成した
後、化学蒸着装置を用い、通常の条件で同じく表２に示
される組成および平均層厚の硬質被覆層を形成すること
によりＩＳＯ規格ＣＮＭＧ４３２のスローアウェイチッ
プ形状をもった本発明表面被覆ＷＣ基超硬合金製切削工
具（以下、本発明切削工具という）１〜８をそれぞれ製
造した。また、比較の目的で、表３に示される通り、上
記軟化層形成熱処理を行なわない以外は同一の条件で従
来表面被覆ＷＣ基超硬合金製切削工具（以下、従来切削
工具という）１〜８をそれぞれ製造した。Then, the above various WC-based cemented carbide substrates A
~ H is subjected to honing with a predetermined width within the range of 0.03 to 0.1 mm, and subsequently in the same vacuum of 10 -2 torr,
Temperature: heated to 1400 ° C., and subjected to a heat treatment for forming a softening layer under the condition of maintaining a predetermined temperature within the range of 10 to 30 minutes, and the honing portion, flank, and rake face of the cutting edge are shown in Table 2. After forming a surface softening layer having an average layer thickness shown in the table, a chemical vapor deposition apparatus is used to form a hard coating layer having the same composition and average layer thickness as shown in Table 2 under normal conditions. The surface-coated WC-based cemented carbide cutting tools of the present invention (hereinafter referred to as the present cutting tools) 1 to 8 each having a chip shape were manufactured. Further, for the purpose of comparison, as shown in Table 3, conventional surface-coated WC-based cemented carbide cutting tools (hereinafter referred to as conventional cutting tools) 1 to 8 under the same conditions except that the softening layer forming heat treatment is not performed. Were manufactured respectively.
【００１１】つぎに、この結果得られた各種の切削工具
について、被削材：ＳＮＣＭ４３９（硬さ：ＨB ２６
０）の長さ方向等間隔縦溝４本入り丸棒、切削速度：１
００ｍ／min.、送り：０．２mm/rev. 、切込み：２mm、
切削時間：１０分、の通常条件での鋼の断続切削試験、
並びに、被削材：ＳＮＣＭ４３９（硬さ：ＨB ２６０）
の長さ方向等間隔縦溝４本入り丸棒、切削速度：１００
ｍ／min.、送り：０．２mm/rev. 、切込み：０．５mm、
切削時間：１０分、の低切込み条件での鋼の断続切削試
験を行ない、いずれの試験でも切刃の逃げ面摩耗幅を測
定した。これらの測定結果を表４に示した。Next, regarding various cutting tools obtained as a result, a work material: SNCM439 (hardness: H B 26
0) Round bar with 4 longitudinal grooves equally spaced in the length direction, cutting speed: 1
00m / min., Feed: 0.2mm / rev., Depth of cut: 2mm,
Cutting time: 10 minutes, intermittent cutting test of steel under normal conditions,
And work material: SNCM439 (hardness: H B 260)
Round bar with 4 longitudinal grooves at equal intervals in the length direction, cutting speed: 100
m / min., feed: 0.2 mm / rev., depth of cut: 0.5 mm,
An interrupted cutting test of steel was performed under a low cutting condition of cutting time: 10 minutes, and the flank wear width of the cutting edge was measured in each test. The results of these measurements are shown in Table 4.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】[0014]
【表３】 [Table 3]
【００１５】[0015]
【表４】 [Table 4]
【００１６】[0016]
【発明の効果】表４に示される結果から、いずれの切削
工具も通常の条件での断続切削ではすぐれた耐欠損性を
示し、切刃に欠損やチッピングの発生なく、すぐれた耐
摩耗性を示すのに対して、低切込みの断続切削では、本
発明切削工具１〜８は、いずれも通常条件の断続切削に
おけると同様にすぐれた耐摩耗性を示すものの、従来切
削工具１〜８は、いずれも切刃に欠損が発生し、これが
原因で比較的短時間で使用寿命に至ることが明らかであ
る。上述のように、この発明の表面被覆ＷＣ基超硬合金
製切削工具は、通常の条件での断続切削や連続切削は勿
論のこと、特に低切込み条件での断続切削においてもす
ぐれた耐欠損性を示し、長期に亘ってすぐれた切削性能
を発揮するのである。From the results shown in Table 4, all cutting tools show excellent fracture resistance in interrupted cutting under normal conditions, with no wear or chipping on the cutting edge, and excellent wear resistance. On the other hand, in intermittent cutting with a low cutting depth, the cutting tools 1 to 8 of the present invention all show excellent wear resistance as in interrupted cutting under normal conditions, but the conventional cutting tools 1 to 8 are: It is clear that in all cases, the cutting edge has a defect, which causes the service life to be reached in a relatively short time. As described above, the surface-coated WC-based cemented carbide cutting tool of the present invention has excellent fracture resistance not only in interrupted cutting and continuous cutting under normal conditions, but particularly in interrupted cutting under low cutting conditions. It shows excellent cutting performance over a long period of time.
Claims (1)
金属結合相：５〜２０重量％を含有し、残りが炭化タン
グステンを主成分とする硬質分散相からなる炭化タング
ステン基超硬合金で構成され、かつ表面部に上記金属結
合相の濃度が中心部に比して相対的に高い表面軟化層を
有する基体の表面に、Ｔｉの炭化物、窒化物、炭窒化
物、炭酸化物、および炭窒酸化物、並びに酸化アルミニ
ウムのうちの１種の単層または２種以上の複層からなる
硬質被覆層を５〜２０μｍの平均層厚で形成してなる表
面被覆炭化タングステン基超硬合金製切削工具におい
て、 切刃の逃げ面およびすくい面における上記表面軟化層の
平均層厚を１５〜４０μｍとし、前記逃げ面とすくい面
の交わるホーニング部の上記表面軟化層の平均層厚を３
〜１０μｍとしたことを特徴とする耐欠損性のすぐれた
表面被覆炭化タングステン基超硬合金製切削工具。1. A metal-bonded phase containing Co and / or Ni as a main component: a tungsten carbide-based cemented carbide containing 5 to 20% by weight, and the balance consisting of a hard dispersed phase containing tungsten carbide as a main component. The Ti carbide, the nitride, the carbonitride, the carbonitride, and the carbonitride are formed on the surface of the substrate having a surface softening layer in which the concentration of the metal binding phase is relatively higher than that in the central portion. Surface-coated tungsten carbide-based cemented carbide cutting tool formed by forming a hard coating layer consisting of a single layer of oxide and aluminum oxide or a multi-layer of two or more layers with an average layer thickness of 5 to 20 μm. In the flank and rake face of the cutting edge, the average layer thickness of the surface softening layer is 15 to 40 μm, and the average layer thickness of the surface softening layer in the honing portion where the flank face and the rake face intersect is 3
A surface-coated tungsten carbide-based cemented carbide cutting tool with excellent fracture resistance, characterized by having a thickness of 10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8135893A JPH06262407A (en) | 1993-03-16 | 1993-03-16 | Cutting tool made of cemented carbide of surface coated tungsten carbide base excellent in chipping resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8135893A JPH06262407A (en) | 1993-03-16 | 1993-03-16 | Cutting tool made of cemented carbide of surface coated tungsten carbide base excellent in chipping resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06262407A true JPH06262407A (en) | 1994-09-20 |
Family
ID=13744131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8135893A Pending JPH06262407A (en) | 1993-03-16 | 1993-03-16 | Cutting tool made of cemented carbide of surface coated tungsten carbide base excellent in chipping resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06262407A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0737756A2 (en) * | 1995-04-12 | 1996-10-16 | Sandvik Aktiebolag | Cemented carbide with binder phase enriched surface zone |
| JP2015502257A (en) * | 2011-11-11 | 2015-01-22 | サンドビック インテレクチュアル プロパティー アクティエボラーグ | Friction stir welding tool made of carbide tungsten carbide containing nickel and having an AL203 surface coating |
-
1993
- 1993-03-16 JP JP8135893A patent/JPH06262407A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0737756A2 (en) * | 1995-04-12 | 1996-10-16 | Sandvik Aktiebolag | Cemented carbide with binder phase enriched surface zone |
| EP0737756A3 (en) * | 1995-04-12 | 1997-05-07 | Sandvik Ab | Cemented carbide with binder phase enriched surface zone |
| JP2015502257A (en) * | 2011-11-11 | 2015-01-22 | サンドビック インテレクチュアル プロパティー アクティエボラーグ | Friction stir welding tool made of carbide tungsten carbide containing nickel and having an AL203 surface coating |
| US9656345B2 (en) | 2011-11-11 | 2017-05-23 | Sandvik Intellectual Property Ab | Friction stir welding tool made of cemented tungsten carbide with nickel and with a AL2O3 surface coating |
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