JP5402516B2 - Surface coated cutting tool with excellent chipping resistance due to hard coating layer - Google Patents
Surface coated cutting tool with excellent chipping resistance due to hard coating layer Download PDFInfo
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この発明は、例えば、高熱発生を伴い、かつ、切刃に対して断続的・衝撃的負荷に繰り返し作用する鋼や鋳鉄の高速断続切削加工において、被削材との潤滑性に優れかつチッピングを発生することなく、長期の使用に亘ってすぐれた切削性能を発揮する表面被覆切削工具（以下、被覆工具という）に関するものである。 This invention is excellent in lubricity with work material and chipping, for example, in high-speed intermittent cutting of steel or cast iron that is accompanied by high heat generation and repeatedly acts on intermittent and impact loads on the cutting edge. The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool) that exhibits excellent cutting performance over a long period of time without being generated.
特許文献１に示すように、従来、炭化タングステン（以下、ＷＣで示す）基超硬合金または炭窒化チタン（以下、ＴｉＣＮで示す）基サーメットで構成された基体（以下、これらを総称して工具基体という）の表面に、
（ａ）下部層が、Ｔｉの炭化物層、窒化物層、炭窒化物層からなる１〜８μｍの層厚を有するＴｉ化合物層、
（ｂ）上部層が、８５％以上のκ型Ａｌ2Ｏ3相と残部がα型Ａｌ2Ｏ3相からなるＡｌ2Ｏ3層、あるいは、さらにＴｉを含有させたＴｉ含有Ａｌ2Ｏ3層（従来Ｔｉ含有Ａｌ2Ｏ3層という）、
からなる硬質被覆層を蒸着形成した被覆工具（従来被覆工具という）が知られており、この従来被覆工具は、耐摩耗性に優れることが知られている。
As shown in Patent Document 1, conventionally, a substrate composed of tungsten carbide (hereinafter referred to as WC) based cemented carbide or titanium carbonitride (hereinafter referred to as TiCN) based cermet (hereinafter collectively referred to as a tool). On the surface of the substrate)
(A) a Ti compound layer having a layer thickness of 1 to 8 μm, wherein the lower layer is composed of a Ti carbide layer, a nitride layer, and a carbonitride layer;
(B) The upper layer is an Al 2 O 3 layer composed of a κ-type Al 2 O 3 phase of 85% or more and the remainder an α-type Al 2 O 3 phase, or Ti-containing Al 2 O 3 further containing Ti. Layer (conventionally called Ti-containing Al 2 O 3 layer),
2. Description of the Related Art A coated tool (referred to as a conventional coated tool) in which a hard coating layer made of is deposited is known, and this conventional coated tool is known to have excellent wear resistance.
また、非特許文献１には、ＣＶＤ法により成膜されたＴｉ含有Ａｌ2Ｏ3コーティングについて開示されており、特に、摩擦係数に及ぼすＴｉ含有量の影響として、例えば、α型Ａｌ2Ｏ3相とＴｉ２Ｓ３相の混合相からなる０．９ａｔ％Ｔｉを含有するＡｌ2Ｏ3層は、Ｔｉを含有しないＡｌ2Ｏ3層に比して高温摩擦係数が低下すること、また、α型Ａｌ2Ｏ3相とＴｉ２Ｓ３相とＴｉ３Ｏ５相とＡｌ２ＴｉＯ５相の混合相からなる４．２ａｔ％Ｔｉを含有するＡｌ2Ｏ3層では、より一段と高温摩擦係数が低下することが述べられているが、このＴｉ含有Ａｌ2Ｏ3コーティング（以下、従来α型Ｔｉ含有Ａｌ2Ｏ3層という）についての切削性能評価は行われていない。 Non-Patent Document 1 discloses a Ti-containing Al 2 O 3 coating formed by a CVD method. In particular, as an influence of the Ti content on the friction coefficient, for example, α-type Al 2 O 3 The Al 2 O 3 layer containing 0.9 at% Ti composed of a mixed phase of Ti 2 S 3 phase and the Ti 2 S 3 phase has a lower high-temperature friction coefficient than an Al 2 O 3 layer not containing Ti, In the Al 2 O 3 layer containing 4.2 at% Ti composed of a mixed phase of α-type Al 2 O 3 phase, Ti 2 S 3 phase, Ti 3 O 5 phase and Al 2 TiO 5 phase, the higher-temperature friction coefficient is further increased. However, the cutting performance evaluation of this Ti-containing Al 2 O 3 coating (hereinafter referred to as α-type Ti-containing Al 2 O 3 layer) has not been performed.
近年の切削装置の高性能化はめざましく、一方で切削加工に対する省力化および省エネ化、さらに低コスト化の要求は強く、これに伴い、切削加工は一段と高速化、高能率化する傾向にあるが、上記従来被覆工具においては、これを低合金鋼や炭素鋼などの一般鋼、さらにねずみ鋳鉄などの普通鋳鉄の通常条件下での切削加工に用いた場合には特に問題はないが、特にこれを、高熱発生を伴い、かつ、切刃に対して断続的・衝撃的負荷が繰り返し作用する鋼や鋳鉄の高速断続切削加工に用いた場合には、硬質被覆層の強度および潤滑性が十分でないため、切刃部にチッピング（微少欠け）を発生しやすくなり、その結果、比較的短時間で使用寿命に至るのが現状である。 In recent years, the performance of cutting machines has been remarkable. On the other hand, there is a strong demand for labor saving and energy saving and further cost reduction for cutting, and along with this, cutting tends to become even faster and more efficient. In the above-mentioned conventional coated tool, there is no particular problem when it is used for cutting of ordinary steel such as low alloy steel and carbon steel, and ordinary cast iron such as gray cast iron. Is used for high-speed intermittent cutting of steel and cast iron, which is accompanied by high heat generation and repeatedly receives intermittent and impact loads on the cutting edge, the strength and lubricity of the hard coating layer is not sufficient Therefore, chipping (small chipping) is likely to occur at the cutting edge, and as a result, the service life is reached in a relatively short time.
そこで、本発明者等は、上述のような観点から、高熱発生を伴い、かつ、切刃に対して、断続的かつ衝撃的な負荷が繰り返し作用する高速断続切削加工に用いた場合にも、すぐれた耐チッピング性を備え、長期の使用に亘ってすぐれた切削性能を発揮する被覆工具を開発すべく、鋭意研究を行った結果、以下の知見を得た。 Therefore, the present inventors, from the above viewpoint, accompanied by high heat generation, and also when used for high-speed intermittent cutting where intermittent and impact load acts repeatedly on the cutting blade, As a result of earnest research to develop a coated tool with excellent chipping resistance and excellent cutting performance over a long period of use, the following findings were obtained.
前記特許文献１に示される従来被覆工具の従来Ｔｉ含有Ａｌ2Ｏ3層は、
例えば、通常の化学蒸着装置にて、
反応ガス組成：容量％で、ＡｌＣｌ3：２％、ＣＯ2：６％、ＴｉＣｌ４：０．２％、ＣＯ：１．９％、Ｈ2：９０％、
ガス流速： ２ｍ／ｓ、
反応雰囲気温度：１０１０℃、
反応雰囲気圧力：５０Ｔｏｒｒ、
の条件で蒸着形成することができるが、この成膜法により得た従来Ｔｉ含有Ａｌ2Ｏ3層を硬質被覆層として蒸着形成した被覆工具は、高速断続切削条件で用いた場合には、チッピングの発生等により寿命が短いものであった。
一方、前記非特許文献１には、従来α型Ｔｉ含有Ａｌ2Ｏ3層の成膜条件についての具体的な開示はないが、
反応ガス組成：容量％で、ＡｌＣｌ3：２〜５％、ＣＯ2：４〜１０％、ＴｉＣｌ４：０．２３％以下、ＨＣｌ：２〜５％、Ｈ2Ｓ：０．１０〜０．３０％、Ｈ2：残り、
反応雰囲気温度：１００５℃、
反応雰囲気圧力：６０Ｔｏｒｒ、
という条件で従来α型Ｔｉ含有Ａｌ2Ｏ3層を成膜したところ、層中に存在するＴｉＯ２相、Ｔｉ３Ｓ４相によって、α型Ａｌ2Ｏ3粒子とＴｉ化合物との粒界強度が低下し、そのため、従来α型Ｔｉ含有Ａｌ2Ｏ3層を硬質被覆層とする被覆工具を高速断続切削条件で用いた場合には、従来Ｔｉ含有Ａｌ2Ｏ3層の場合と同様、チッピングの発生等により寿命が短いものであった。
The conventional Ti-containing Al 2 O 3 layer of the conventional coated tool shown in Patent Document 1 is
For example, in a normal chemical vapor deposition system,
Reaction gas composition: volume%, AlCl 3 : 2%, CO 2 : 6%, TiCl 4 : 0.2%, CO: 1.9%, H 2 : 90%,
Gas flow rate: 2 m / s,
Reaction atmosphere temperature: 1010 ° C.
Reaction atmosphere pressure: 50 Torr,
However, the coated tool formed by vapor deposition of the conventional Ti-containing Al 2 O 3 layer obtained by this film-forming method as a hard coating layer is chipped when used under high-speed intermittent cutting conditions. The lifetime was short due to the occurrence of
On the other hand, the non-patent document 1 does not specifically disclose the film forming conditions of the conventional α-type Ti-containing Al 2 O 3 layer.
Reaction gas composition: volume%, AlCl 3 : 2 to 5%, CO 2 : 4 to 10%, TiCl 4 : 0.23% or less, HCl: 2 to 5%, H 2 S: 0.10 to 0. 30%, H 2 : remaining,
Reaction atmosphere temperature: 1005 ° C.
Reaction atmosphere pressure: 60 Torr,
Conventionally, when an α-type Ti-containing Al 2 O 3 layer was formed under the conditions described above, the grain boundary strength between α-type Al 2 O 3 particles and a Ti compound was determined by the TiO 2 phase and Ti 3 S 4 phase present in the layer. Therefore, when a coated tool having a conventional α-type Ti-containing Al 2 O 3 layer as a hard coating layer is used under high-speed intermittent cutting conditions, chipping is performed in the same manner as in the conventional Ti-containing Al 2 O 3 layer. The lifetime was short due to the occurrence of
そこで、本発明者等は、耐チッピング性に優れたＴｉ含有Ａｌ2Ｏ3層の成膜条件について更に検討を進めたところ、
第一段階として、
反応ガス組成：容量％で、ＡｌＣｌ3：０．１〜１％、ＣＯ2：１〜２％、ＴｉＣｌ４：０．１〜１％、ＨＣｌ：１〜２％、Ｈ2：残り、
反応雰囲気温度：９８０〜１０２０℃、
反応雰囲気圧力：４０〜６０Ｔｏｒｒ、
という条件で成膜した後、
第二段階として、
反応ガス組成：容量％で、ＡｌＣｌ3：２〜５％、ＣＯ2：８〜１２％、ＴｉＣｌ４：０．３〜０．９％、ＨＣｌ：２〜５％、Ｈ2Ｓ：０．４０〜０．８０％、Ｈ2：残り、
反応雰囲気温度：９００〜９６０℃、
反応雰囲気圧力：４０〜６０Ｔｏｒｒ、
という条件でＴｉ含有Ａｌ2Ｏ3層を成膜した場合には、耐チッピング性に優れたＴｉ含有Ａｌ2Ｏ3層を成膜し得ることを知見した。
即ち、上記成膜条件でＴｉ含有Ａｌ2Ｏ3層を成膜した場合には、α型Ａｌ2Ｏ3相とκ型Ａｌ2Ｏ3相とＴｉ化合物相との混合組織からなるＴｉ含有Ａｌ2Ｏ3層（以下、改質Ｔｉ含有Ａｌ2Ｏ3層という）が形成され、さらに、該Ｔｉ化合物相には、チタン酸化物（以下、ＴｉＯ２で示す）相およびチタン硫化物（以下、Ｔｉ３Ｓ４で示す）相が含まれていた。
そして、上記改質Ｔｉ含有Ａｌ2Ｏ3層を硬質被覆層として被覆形成した被覆工具を、鋼や鋳鉄の高速断続切削加工に供したところ、改質Ｔｉ含有Ａｌ2Ｏ3層中に含有されるＴｉＯ２相およびＴｉ３Ｓ４相は、粒界強度の低下を招くことなく、むしろ、硬質被覆層の強度を高め、かつ、潤滑性を高めるため、チッピングの発生を抑制するとともに、長期の使用に亘って優れた切削性能を発揮することを見出したのである。
Therefore, the present inventors have further investigated the film forming conditions of the Ti-containing Al 2 O 3 layer excellent in chipping resistance,
As a first step,
Reaction gas composition: volume%, AlCl 3 : 0.1 to 1%, CO 2 : 1 to 2%, TiCl 4 : 0.1 to 1%, HCl: 1 to 2%, H 2 : remaining,
Reaction atmosphere temperature: 980-1020 ° C.
Reaction atmosphere pressure: 40-60 Torr,
After film formation under the conditions
As the second stage,
Reaction gas composition: volume%, AlCl 3 : 2 to 5%, CO 2 : 8 to 12%, TiCl 4 : 0.3 to 0.9%, HCl: 2 to 5%, H 2 S: 0.40 ~0.80%, H 2: remainder,
Reaction atmosphere temperature: 900-960 ° C.
Reaction atmosphere pressure: 40-60 Torr,
When depositing the Ti-containing the Al 2 O 3 layer with the proviso that, were found that may deposited Ti-containing Al 2 O 3 layer excellent in chipping resistance.
That is, when a Ti-containing Al 2 O 3 layer is formed under the above film forming conditions, a Ti-containing Al composed of a mixed structure of an α-type Al 2 O 3 phase, a κ-type Al 2 O 3 phase, and a Ti compound phase. 2 O 3 layer (hereinafter referred to as a modified Ti-containing Al 2 O 3 layer) is formed, and the Ti compound phase includes a titanium oxide (hereinafter referred to as TiO 2 ) phase and a titanium sulfide (hereinafter referred to as Phase) (shown as Ti 3 S 4 ).
Then, when the coated tool formed by coating the modified Ti-containing Al 2 O 3 layer as a hard coating layer was subjected to high-speed intermittent cutting of steel or cast iron, it was contained in the modified Ti-containing Al 2 O 3 layer. The TiO 2 phase and Ti 3 S 4 phase do not cause a decrease in grain boundary strength, but rather increase the strength of the hard coating layer and improve the lubricity, thereby suppressing the occurrence of chipping, and It has been found that excellent cutting performance is exhibited over use.
この発明は、上記知見に基づいてなされたものであって、
「 炭化タングステン基超硬合金または炭窒化チタン基サーメットで構成された工具基体の表面に、下部層と上部層からなる硬質被覆層を蒸着形成した表面被覆切削工具において、
（ａ）下部層は、チタンの炭化物層、窒化物層、炭窒化物層、炭酸化物層および炭窒酸化物層のうちの１層または２層以上からなり、かつ、３〜２０μｍの合計平均層厚を有するチタン化合物層からなり、
（ｂ）上部層は、１〜１５μｍの平均層厚を有し、α型の結晶構造を有する酸化アルミニウム相、κ型の結晶構造を有する酸化アルミニウム相およびチタン酸化物とチタン硫化物を少なくとも含むチタン化合物相との混合組織層からなり、
（ｃ）上記上部層において、κ型の結晶構造を有する酸化アルミニウム相との合量に占めるα型の結晶構造を有する酸化アルミニウム相の含有割合は６０〜９０％であり、
（ｄ）上記上部層における、チタンとアルミニウムと酸素と硫黄の合計量に占めるチタンの含有割合は０．３〜３原子％、また、硫黄の含有割合は０．１〜２原子％であり、さらに、チタン硫化物はＴｃ（１００）＞２を満足する配向性を備えている、
ことを特徴とする表面被覆切削工具。」
に特徴を有するものである。
This invention has been made based on the above findings,
In a surface-coated cutting tool in which a hard coating layer composed of a lower layer and an upper layer is vapor-deposited on the surface of a tool base composed of tungsten carbide-based cemented carbide or titanium carbonitride-based cermet,
(A) The lower layer is composed of one or more of a titanium carbide layer, a nitride layer, a carbonitride layer, a carbonate layer, and a carbonitride layer, and has a total average of 3 to 20 μm. It consists of a titanium compound layer having a layer thickness,
(B) The upper layer has an average layer thickness of 1 to 15 μm and includes at least an aluminum oxide phase having an α-type crystal structure, an aluminum oxide phase having a κ-type crystal structure, and titanium oxide and titanium sulfide. It consists of a mixed tissue layer with a titanium compound phase,
(C) In the upper layer, the content ratio of the aluminum oxide phase having an α-type crystal structure in the total amount with the aluminum oxide phase having a κ-type crystal structure is 60 to 90%,
(D) The content ratio of titanium in the total amount of titanium, aluminum, oxygen and sulfur in the upper layer is 0.3 to 3 atomic%, and the content ratio of sulfur is 0.1 to 2 atomic%. Further, the titanium sulfide has an orientation satisfying Tc (100)> 2.
A surface-coated cutting tool characterized by that. "
It has the characteristics.
以下に、この発明の被覆工具の硬質被覆層について、詳細に説明する。
（ａ）Ｔｉ化合物層（下部層）
Ｔｉの炭化物（以下、ＴｉＣで示す）層、窒化物（以下、同じくＴｉＮで示す）層、炭窒化物（以下、ＴｉＣＮで示す）層、炭酸化物（以下、ＴｉＣＯで示す）層および炭窒酸化物（以下、ＴｉＣＮＯで示す）層のうちの１層または２層以上からなるＴｉ化合物層は、自身の具備するすぐれた靭性及び耐摩耗性によって硬質被覆層の高温強度向上に寄与するほか、工具基体と改質Ｔｉ含有Ａｌ2Ｏ3層からなる上部層のいずれにも強固に密着し、硬質被覆層の工具基体に対する密着性向上にも寄与する作用を有するが、その合計平均層厚が３μｍ未満では、前記作用を十分に発揮させることができず、一方その合計平均層厚が２０μｍを越えると、特に高熱発生下の高速断続切削条件では熱塑性変形を起し易くなり、これが偏摩耗の原因となることから、その合計平均層厚を３〜２０μｍと定めた。
Below, the hard coating layer of the coated tool of this invention is demonstrated in detail.
(A) Ti compound layer (lower layer)
Ti carbide (hereinafter referred to as TiC) layer, nitride (hereinafter also referred to as TiN) layer, carbonitride (hereinafter referred to as TiCN) layer, carbonate (hereinafter referred to as TiCO) layer and carbonitriding The Ti compound layer consisting of one or more of the material layers (hereinafter referred to as TiCNO) contributes to improving the high-temperature strength of the hard coating layer due to its excellent toughness and wear resistance. It adheres firmly to both the substrate and the upper layer comprising the modified Ti-containing Al 2 O 3 layer, and contributes to improving the adhesion of the hard coating layer to the tool substrate, but the total average layer thickness is 3 μm. If the total thickness is less than 20 μm, thermoplastic deformation tends to occur particularly under high-speed intermittent cutting conditions under high heat generation, which is a cause of uneven wear. Become From, defining a total average layer thickness thereof and 3 to 20 [mu] m.
（ｂ）改質Ｔｉ含有Ａｌ2Ｏ3層（上部層）
上部層を構成する改質Ｔｉ含有Ａｌ2Ｏ3層は、既に述べたように、
通常の化学蒸着装置を用い、
第一段階として、
反応ガス組成：容量％で、ＡｌＣｌ3：０．１〜１％、ＣＯ2：１〜２％、ＴｉＣｌ４：０．１〜１％、ＨＣｌ：１〜２％、Ｈ2：残り、
反応雰囲気温度：９８０〜１０２０℃、
反応雰囲気圧力：４０〜６０Ｔｏｒｒ、
という条件で成膜した後、
第二段階として、
反応ガス組成：容量％で、ＡｌＣｌ3：２〜５％、ＣＯ2：８〜１２％、ＴｉＣｌ４：０．３〜０．９％、ＨＣｌ：２〜５％、Ｈ2Ｓ：０．４０〜０．８０％、Ｈ2：残り、
反応雰囲気温度：９００〜９６０℃、
反応雰囲気圧力：４０〜６０Ｔｏｒｒ、
という条件で蒸着することによって成膜することができる。
得られた改質Ｔｉ含有Ａｌ2Ｏ3層は、α型Ａｌ2Ｏ3相とκ型Ａｌ2Ｏ3相とＴｉ化合物相との混合組織から構成され、さらに、該Ｔｉ化合物相には、少なくともＴｉＯ２およびＴｉ３Ｓ４が含有されている。
(B) Modified Ti-containing Al 2 O 3 layer (upper layer)
The modified Ti-containing Al 2 O 3 layer constituting the upper layer is as described above,
Using normal chemical vapor deposition equipment,
As a first step,
Reaction gas composition: volume%, AlCl 3 : 0.1 to 1%, CO 2 : 1 to 2%, TiCl 4 : 0.1 to 1%, HCl: 1 to 2%, H 2 : remaining,
Reaction atmosphere temperature: 980-1020 ° C.
Reaction atmosphere pressure: 40-60 Torr,
After film formation under the conditions
As the second stage,
Reaction gas composition: volume%, AlCl 3 : 2 to 5%, CO 2 : 8 to 12%, TiCl 4 : 0.3 to 0.9%, HCl: 2 to 5%, H 2 S: 0.40 ~0.80%, H 2: remainder,
Reaction atmosphere temperature: 900-960 ° C.
Reaction atmosphere pressure: 40-60 Torr,
A film can be formed by vapor deposition under the conditions.
The obtained modified Ti-containing Al 2 O 3 layer is composed of a mixed structure of an α-type Al 2 O 3 phase, a κ-type Al 2 O 3 phase, and a Ti compound phase. At least TiO 2 and Ti 3 S 4 are contained.
上記改質Ｔｉ含有Ａｌ2Ｏ3層について、Ｘ線回折を行い、Ｘ線回折ピーク強度比からα型Ａｌ2Ｏ3相とκ型Ａｌ2Ｏ3相の含有割合を求めると、κ型Ａｌ2Ｏ3相との合量に占めるα型Ａｌ2Ｏ3相の含有割合は６０〜９０％となる。
α型Ａｌ2Ｏ3相の含有割合は、上記２段階の蒸着によって影響される。第一段階では、ＡｌＣｌ3とＴｉＣｌ４を０．１〜１％と少量添加することで、所望のα，κ型Ａｌ2Ｏ3核を形成し、その後、第二段階のＴｉＣｌ４添加量と蒸着温度の制御によって所望のα型Ａｌ2Ｏ3相の含有割合を得る。
第二段階でのＴｉＣｌ４添加量が０．９％を超えるとα型Ａｌ2Ｏ3相の含有割合が６０％未満になり高温強度が低下する。一方、第二段階でのＴｉＣｌ４添加量が０．３％未満になるとα型Ａｌ2Ｏ3相の含有割合が９０％以上となり、κ型Ａｌ2Ｏ3相の特性である熱遮蔽効果が低下するため、κ型Ａｌ2Ｏ3相との合量に占めるα型Ａｌ2Ｏ3相の含有割合を６０〜９０％と定めた。
The modified Ti-containing Al 2 O 3 layer is subjected to X-ray diffraction, and the content ratio of the α-type Al 2 O 3 phase and the κ-type Al 2 O 3 phase is determined from the X-ray diffraction peak intensity ratio. 2 the content of the total amount accounted α-type Al 2 O 3 phase with O 3 phase is 60 to 90%.
The content ratio of the α-type Al 2 O 3 phase is affected by the two-stage vapor deposition. In the first stage, the desired α, κ-type Al 2 O 3 nuclei are formed by adding a small amount of AlCl 3 and TiCl 4 as 0.1 to 1%, and then the amount of TiCl 4 added in the second stage The desired α-type Al 2 O 3 phase content is obtained by controlling the deposition temperature.
When the amount of TiCl 4 added in the second stage exceeds 0.9%, the content ratio of the α-type Al 2 O 3 phase becomes less than 60% and the high-temperature strength decreases. On the other hand, when the TiCl 4 addition amount in the second stage is less than 0.3%, the content ratio of the α-type Al 2 O 3 phase becomes 90% or more, and the heat shielding effect that is a characteristic of the κ-type Al 2 O 3 phase is obtained. Therefore, the content ratio of the α-type Al 2 O 3 phase in the total amount with the κ-type Al 2 O 3 phase was determined to be 60 to 90%.
また、上記改質Ｔｉ含有Ａｌ2Ｏ3層からなる上部層において、Ｔｉ含有割合は、反応ガスにおけるＴｉＣｌ４濃度によって影響される。
そして、ＴｉはＴｉＯ２相として存在し、α型Ａｌ2Ｏ3相とκ型Ａｌ2Ｏ3相が共存する本発明の改質Ｔｉ含有Ａｌ2Ｏ3層においては、Ａｌ2Ｏ3粒子とＴｉ３Ｓ４粒子間の粒界強度を向上させる作用があり、上部層の強度向上に寄与する。
ただ、Ｔｉの含有割合（原子％）を、Ｔｉ／（Ｔｉ＋Ａｌ＋Ｏ＋Ｓ）×１００で表した場合、Ｔｉの含有割合が０．３ａｔ％未満ではＡｌ2Ｏ3粒子とＴｉ３Ｓ４粒子間の粒界強度向上がみられず、一方、Ｔｉの含有割合が３ａｔ％を超えた場合にはα型Ａｌ2Ｏ3相の含有割合が６０％未満になるため、Ｔｉの含有割合は０．３〜３ａｔ％と定めた。
In the upper layer composed of the modified Ti-containing Al 2 O 3 layer, the Ti content ratio is influenced by the TiCl 4 concentration in the reaction gas.
In the modified Ti-containing Al 2 O 3 layer of the present invention in which Ti exists as a TiO 2 phase and the α-type Al 2 O 3 phase and the κ-type Al 2 O 3 phase coexist, Al 2 O 3 particles and It has the effect of improving the grain boundary strength between Ti 3 S 4 particles, and contributes to the strength improvement of the upper layer.
However, when the Ti content (atomic%) is expressed as Ti / (Ti + Al + O + S) × 100, the grain boundary between the Al 2 O 3 particles and the Ti 3 S 4 particles is less than 0.3 at% when the Ti content is less than 0.3 at%. On the other hand, when the content ratio of Ti exceeds 3 at%, the content ratio of the α-type Al 2 O 3 phase is less than 60%, so the Ti content ratio is 0.3 to 3 at %. %.
また、上部層におけるＳの含有割合は、反応ガスにおけるＨ2Ｓ濃度によって影響される。
ＳはＴｉ３Ｓ４相として存在し、本発明の改質Ｔｉ含有Ａｌ2Ｏ3層においては、付着強度を向上させるとともに、切削加工時に被削材との濡れ性を改善する作用があり、その結果、上部層の強度向上および潤滑性向上に寄与する。
特に、前記本発明の成膜条件で改質Ｔｉ含有Ａｌ2Ｏ3層を成膜した場合には、上記Ｔｉ３Ｓ４相は、Ｔｃ（１００）＞２を満足する配向性を備えるようになり、この点からも上部層の強度はより一段と向上する。
ただ、Ｓの含有割合（原子％）を、Ｓ／（Ｔｉ＋Ａｌ＋Ｏ＋Ｓ）×１００で表した場合、Ｓの含有割合が０．１ａｔ％未満では、切削時に被削材との濡れ性を十分に発揮できず、一方、Ｓの含有割合が２ａｔ％を超えた場合には、Ａｌ2Ｏ3粒子とＴｉ３Ｓ４粒子間の粒界強度が低下するため、Ｓの含有割合を０．１〜２ａｔ％と定めた。
また、Ｔｉ３Ｓ４相についてのＴｃ（１００）＞２は、
一般式：
Ｔｃ（ｈｋｌ）＝Ｉ（ｈｋｌ）／Ｉ０（ｈｋｌ）
×[１／ＮΣ｛Ｉ（ｈｋｌ）／Ｉ０（ｈｋｌ）｝]−１
にしたがい、Ｔｉ３Ｓ４相が（１００）面に配向している配向係数が２を超えることを示すが、Ｔｃ（１００）＞２としたのは、Ｔｃ（１００）が２未満では切削時にチッピングが起こるが、Ｔｃ（１００）＞２では切削時におけるチッピングが起こらなかったためという理由による。
The S content in the upper layer is affected by the H 2 S concentration in the reaction gas.
S exists as a Ti 3 S 4 phase, and in the modified Ti-containing Al 2 O 3 layer of the present invention, there is an effect of improving the adhesion strength and improving the wettability with the work material at the time of cutting, As a result, it contributes to improving the strength and lubricity of the upper layer.
In particular, when the modified Ti-containing Al 2 O 3 layer is formed under the film forming conditions of the present invention, the Ti 3 S 4 phase has an orientation satisfying Tc (100)> 2. Therefore, the strength of the upper layer is further improved from this point.
However, when the S content (atomic%) is expressed as S / (Ti + Al + O + S) × 100, if the S content is less than 0.1 at%, the wettability with the work material can be sufficiently exhibited during cutting. On the other hand, when the S content exceeds 2 at%, the grain boundary strength between the Al 2 O 3 particles and the Ti 3 S 4 particles decreases, so the S content is 0.1 to 2 at%. It was determined.
Also, Tc (100)> 2 for the Ti 3 S 4 phase is
General formula:
Tc (hkl) = I (hkl) / I 0 (hkl)
× [1 / NΣ {I (hkl) / I 0 (hkl)}] −1
Accordingly, the orientation coefficient in which the Ti 3 S 4 phase is oriented in the (100) plane is more than 2, but Tc (100)> 2 is that when Tc (100) is less than 2, Chipping occurs, but when Tc (100)> 2, chipping did not occur during cutting.
上記のとおり、この発明の被覆工具は、硬質被覆層の上部層を、α型Ａｌ２Ｏ３相、κ型Ａｌ２Ｏ３相およびＴｉ化合物相の混合組織層で構成し、該混合組織層におけるα型Ａｌ２Ｏ３相含有割合を０．６〜０．９とし、また、Ｔｉ化合物相としては少なくともＴｉＯ２、Ｔｉ３Ｓ４を形成し、さらに、Ｔｉ３Ｓ４にはＴｃ（１００）＞２を満足する配向性を有せしめることにより、切刃に対して断続的・衝撃的負荷が繰り返し作用する鋼や鋳鉄の高速断続切削加工において、被削材との潤滑性に優れかつチッピングを発生することなく、長期の使用に亘ってすぐれた切削性能を発揮する被覆工具を提供するものである。 As described above, in the coated tool of the present invention, the upper layer of the hard coating layer is composed of a mixed structure layer of α-type Al 2 O 3 phase, κ-type Al 2 O 3 phase and Ti compound phase, and the mixed structure layer The content ratio of α-type Al 2 O 3 phase is 0.6 to 0.9, and at least TiO 2 and Ti 3 S 4 are formed as the Ti compound phase. Further, Ti 3 S 4 has Tc (100 )> 2 by providing an orientation that satisfies the requirements of 2 and is excellent in lubricity with the work material and chipping in high-speed intermittent cutting of steel and cast iron in which intermittent and impact loads act repeatedly on the cutting edge. It is an object of the present invention to provide a coated tool that exhibits excellent cutting performance over a long period of use without causing any problems.
つぎに、この発明の被覆工具を実施例により具体的に説明する。 Next, the coated tool of the present invention will be specifically described with reference to examples.
原料粉末として、いずれも２〜４μｍの平均粒径を有するＷＣ粉末、ＴｉＣ粉末、ＺｒＣ粉末、ＶＣ粉末、ＴａＣ粉末、ＮｂＣ粉末、Ｃｒ3Ｃ2粉末、ＴｉＮ粉末、ＴａＮ粉末、およびＣｏ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、さらにワックスを加えてアセトン中で２４時間ボールミル混合し、減圧乾燥した後、９８ＭＰａの圧力で所定形状の圧粉体にプレス成形し、この圧粉体を５Ｐａの真空中、１３７０〜１４７０℃の範囲内の所定の温度に１時間保持の条件で真空焼結し、焼結後、切刃部にＲ：０．０７ｍｍのホーニング加工を施すことによりＩＳＯ・ＣＮＭＧ１２０４０８に規定するスローアウエイチップ形状をもったＷＣ基超硬合金製の工具基体Ａ〜Ｅをそれぞれ製造した。 WC powder, TiC powder, ZrC powder, VC powder, TaC powder, NbC powder, Cr 3 C 2 powder, TiN powder, TaN powder, and Co powder all having an average particle diameter of 2 to 4 μm are prepared as raw material powders. These raw material powders were blended into the composition shown in Table 1, added with wax, ball milled in acetone for 24 hours, dried under reduced pressure, and pressed into a green compact with a predetermined shape at a pressure of 98 MPa. The green compact was vacuum sintered at a predetermined temperature in the range of 1370 to 1470 ° C. for 1 hour in a vacuum of 5 Pa. After sintering, the cutting edge portion was R: 0.07 mm honing By processing, tool bases A to E made of a WC-based cemented carbide having a throwaway tip shape defined in ISO · CNMG120408 were produced.
また、原料粉末として、いずれも０．５〜２μｍの平均粒径を有するＴｉＣＮ（質量比でＴｉＣ／ＴｉＮ＝５０／５０）粉末、Ｍｏ2Ｃ粉末、ＺｒＣ粉末、ＮｂＣ粉末、ＴａＣ粉末、ＷＣ粉末、Ｃｏ粉末、およびＮｉ粉末を用意し、これら原料粉末を、表２に示される配合組成に配合し、ボールミルで２４時間湿式混合し、乾燥した後、９８ＭＰａの圧力で圧粉体にプレス成形し、この圧粉体を１．３ｋＰａの窒素雰囲気中、温度：１５４０℃に１時間保持の条件で焼結し、焼結後、切刃部分にＲ：０．０７ｍｍのホーニング加工を施すことによりＩＳＯ規格・ＣＮＭＧ１２０４０８のチップ形状をもったＴｉＣＮ基サーメット製の工具基体ａ〜ｅを形成した。 In addition, as raw material powders, TiCN (mass ratio TiC / TiN = 50/50) powder, Mo 2 C powder, ZrC powder, NbC powder, TaC powder, WC powder, all having an average particle diameter of 0.5 to 2 μm. Co powder and Ni powder are prepared, and these raw material powders are blended in the blending composition shown in Table 2, wet mixed by a ball mill for 24 hours, dried, and pressed into a compact at a pressure of 98 MPa. The green compact was sintered in a nitrogen atmosphere of 1.3 kPa at a temperature of 1540 ° C. for 1 hour, and after the sintering, the cutting edge portion was subjected to a honing process of R: 0.07 mm. Tool bases a to e made of TiCN base cermet having a standard / CNMG120408 chip shape were formed.
ついで、これらの工具基体Ａ〜Ｅおよび工具基体ａ〜ｅのそれぞれを、通常の化学蒸着装置に装入し、
まず、表３（表３中のｌ−ＴｉＣＮは特開平６−８０１０号公報に記載される縦長成長結晶組織をもつＴｉＣＮ層の形成条件を示すものであり、これ以外は通常の粒状結晶組織の形成条件を示すものである）に示される条件にて、表７に示される目標層厚のＴｉ化合物層を硬質被覆層の下部層として蒸着形成し、
ついで、表４に示される条件にて、表８に示される目標層厚の改質Ｔｉ含有Ａｌ2Ｏ3層を硬質被覆層の上部層として蒸着形成することにより本発明被覆工具１〜１０をそれぞれ製造した。
Then, each of these tool bases A to E and tool bases a to e is charged into a normal chemical vapor deposition apparatus,
First, Table 3 (l-TiCN in Table 3 indicates the conditions for forming a TiCN layer having a vertically grown crystal structure described in JP-A No. 6-8010, and other than that, a normal granular crystal structure is shown. The Ti compound layer having the target layer thickness shown in Table 7 is formed as a lower layer of the hard coating layer under the conditions shown in FIG.
Then, under the conditions shown in Table 4, the coated tools 1 to 10 of the present invention are formed by vapor-depositing the modified Ti-containing Al 2 O 3 layer having the target layer thickness shown in Table 8 as the upper layer of the hard coating layer. Each was manufactured.
また、比較の目的で、硬質被覆層の下部層を表３に示される条件にて形成し、上部層を表５に示される条件にて形成することにより、表９に示される目標層厚の従来Ｔｉ含有Ａｌ2Ｏ3層（前記特許文献１に相当）からなる硬質被覆層を設けた従来被覆工具１〜５をそれぞれ製造した。 For the purpose of comparison, the lower layer of the hard coating layer is formed under the conditions shown in Table 3, and the upper layer is formed under the conditions shown in Table 5, so that the target layer thickness shown in Table 9 is obtained. Conventional coated tools 1 to 5 provided with a hard coating layer made of a conventional Ti-containing Al 2 O 3 layer (corresponding to Patent Document 1) were produced.
さらに、比較の目的で、硬質被覆層の下部層を表３に示される条件にて形成し、上部層を表６に示される条件にて形成することにより、表９に示される目標層厚の従来α型Ｔｉ含有Ａｌ2Ｏ3層（前記非特許文献１に相当）からなる硬質被覆層を設けた参考被覆工具６〜１０をそれぞれ製造した。
なお、従来被覆工具１〜５および参考被覆工具６〜１０の工具基体種別、下部層種別及び下部層厚は、それぞれ、本発明被覆工具１〜１０のそれと同じである。
Further, for the purpose of comparison, the lower layer of the hard coating layer is formed under the conditions shown in Table 3, and the upper layer is formed under the conditions shown in Table 6, so that the target layer thickness shown in Table 9 is obtained. Reference coated tools 6 to 10 each provided with a hard coating layer comprising a conventional α-type Ti-containing Al 2 O 3 layer (corresponding to Non-Patent Document 1) were produced.
The tool base type, the lower layer type, and the lower layer thickness of the conventional coated tools 1 to 5 and the reference coated tools 6 to 10 are the same as those of the inventive coated tools 1 to 10, respectively.
ついで、上記の本発明被覆工具１〜１０、従来被覆工具１〜５および参考被覆工具６〜１０の硬質被覆層の上部層を構成する改質Ｔｉ含有Ａｌ2Ｏ3層、従来Ｔｉ含有Ａｌ2Ｏ3層および従来α型Ｔｉ含有Ａｌ2Ｏ3層について、Ｘ線回折を行い、Ｘ線回折ピーク強度比からα型Ａｌ2Ｏ3相とκ型Ａｌ2Ｏ3相の合計に占めるα型Ａｌ2Ｏ3相の含有割合を求めた。
また、オージェ分光分析により、上部層に含有されるＴｉ含有量及びＳ含有量を求めた。
さらに、上部層に存在するＴｉ３Ｓ４については、そのＴｃ（１００）を次の式、
Ｔｃ（１００）＝Ｉ（１００）／Ｉ０（１００）
×[１／ＮΣ｛Ｉ（ｈｋｌ）／Ｉ０（ｈｋｌ）｝]−１
ここで、
Ｉ（ｈｋｌ）：（ｈｋｌ）面の測定したＸ線回折強度、
Ｉ０（ｈｋｌ）：ＪＣＰＤＳパウダーの（ｈｋｌ）面のＸ線回折データの強度、
Ｎ：計算に使用した結晶面であり、使用した（ｈｋｌ）結晶面数、
使用した（ｈｋｌ）面：（１００），（００４），（１０２），（１０３），（００６），（１０５），（１１０），（２０３），（２０４）
により求めた。
上記で求めたそれぞれの値を表８、表９に示す。
Next, the modified Ti-containing Al 2 O 3 layer constituting the upper layer of the hard coating layer of the present invention-coated tools 1 to 10, the conventional coated tools 1 to 5 and the reference coated tools 6 to 10, and the conventional Ti-containing Al 2 X-ray diffraction is performed on the O 3 layer and the conventional α-type Ti-containing Al 2 O 3 layer, and the α-type accounts for the total of the α-type Al 2 O 3 phase and the κ-type Al 2 O 3 phase from the X-ray diffraction peak intensity ratio. The content ratio of the Al 2 O 3 phase was determined.
Further, the Ti content and the S content contained in the upper layer were determined by Auger spectroscopic analysis.
Furthermore, for Ti 3 S 4 present in the upper layer, its Tc (100) is expressed by the following equation:
Tc (100) = I (100) / I 0 (100)
× [1 / NΣ {I (hkl) / I 0 (hkl)}] −1
here,
I (hkl): X-ray diffraction intensity measured on the (hkl) plane,
I 0 (hkl): intensity of X-ray diffraction data of (hkl) plane of JCPDS powder,
N: crystal face used for calculation, (hkl) crystal face number used,
Used (hkl) plane: (100), (004), (102), (103), (006), (105), (110), (203), (204)
Determined by
Tables 8 and 9 show the values obtained above.
また、上記の本発明被覆工具１〜１０、従来被覆工具１〜５および参考被覆工具６〜１０の硬質被覆層の下部層、上部層の厚さを、走査型電子顕微鏡を用いて測定（縦断面測定）した。
その値を表８、表９に示す。
Moreover, the thickness of the lower layer and the upper layer of the hard coating layer of the present invention coated tools 1 to 10, the conventional coated tools 1 to 5 and the reference coated tools 6 to 10 is measured using a scanning electron microscope (longitudinal profile). Surface measurement).
The values are shown in Tables 8 and 9.
つぎに、上記の本発明被覆工具１〜１０、従来被覆工具１〜５および参考被覆工具６〜１０について、いずれも工具鋼製バイトの先端部に固定治具にてネジ止めした状態で、
被削材：ＪＩＳ・ＳＣＭ４３５の長さ方向等間隔４本縦溝入り丸棒、
切削速度： ３００ ｍ／ｍｉｎ．、
切り込み： １．５ ｍｍ、
送り： ０．１５ ｍｍ／ｒｅｖ．、
切削時間： ５ 分、
の条件（切削条件Ａという）でのクロムモリブデン合金鋼の乾式高速断続切削試験（通常の切削速度は、２５０ｍ／ｍｉｎ）、
被削材：ＪＩＳ・Ｓ３５Ｃの長さ方向等間隔４本縦溝入り丸棒、
切削速度： ３００ ｍ／ｍｉｎ．、
切り込み： １．５ ｍｍ、
送り： ０．１３ ｍｍ／ｒｅｖ．、
切削時間： ５ 分、
の条件（切削条件Ｂという）での炭素鋼の乾式高速断続切削試験（通常の切削速度は、２５０ｍ／ｍｉｎ．）、
被削材：ＪＩＳ・ＦＣ３００の長さ方向等間隔４本縦溝入り丸棒、
切削速度： ３５０ ｍ／ｍｉｎ．、
切り込み： １．５ ｍｍ、
送り： ０．１５ ｍｍ／ｒｅｖ．、
切削時間： ５ 分、
の条件（切削条件Ｃという）での鋳鉄の乾式高速断続切削試験（通常の切削速度は、３００ｍ／ｍｉｎ．）、
を行い、いずれの切削試験でも切刃の逃げ面摩耗幅を測定した。この測定結果を表１０に示した。
Next, for the above-mentioned present coated tools 1-10, the conventional coated tools 1-5, and the reference coated tools 6-10, all are screwed with a fixing jig to the tip of the tool steel tool,
Work material: JIS · SCM435 lengthwise equally spaced four round grooved round bars,
Cutting speed: 300 m / min. ,
Cutting depth: 1.5 mm,
Feed: 0.15 mm / rev. ,
Cutting time: 5 minutes,
Dry high-speed intermittent cutting test (normal cutting speed is 250 m / min) of chromium molybdenum alloy steel under the conditions (referred to as cutting condition A),
Work material: JIS-S35C lengthwise equal length 4 round fluted round bars,
Cutting speed: 300 m / min. ,
Cutting depth: 1.5 mm,
Feed: 0.13 mm / rev. ,
Cutting time: 5 minutes,
Dry high-speed intermittent cutting test (normal cutting speed is 250 m / min.) Of carbon steel under the following conditions (referred to as cutting conditions B),
Work material: JIS / FC300 lengthwise equidistant 4 bars with vertical grooves,
Cutting speed: 350 m / min. ,
Cutting depth: 1.5 mm,
Feed: 0.15 mm / rev. ,
Cutting time: 5 minutes,
A dry high-speed intermittent cutting test of cast iron under the following conditions (referred to as cutting conditions C) (normal cutting speed is 300 m / min.),
In each cutting test, the flank wear width of the cutting edge was measured. The measurement results are shown in Table 10.
表８〜１０に示される結果から、本発明被覆工具１〜１０は、硬質被覆層の上部層がα型Ａｌ２Ｏ３相、κ型Ａｌ２Ｏ３相およびＴｉ化合物相の混合組織層で構成され、該混合組織層におけるα型Ａｌ２Ｏ３相含有割合は０．６〜０．９であり、Ｔｉ化合物相としては少なくともＴｉＯ２、Ｔｉ３Ｓ４が含有され、該Ｔｉ３Ｓ４がＴｃ（１００）＞２を満足する配向性を有することから、切刃に対して断続的・衝撃的負荷が繰り返し作用する鋼や鋳鉄の高速断続切削加工において、被削材との潤滑性に優れかつチッピングを発生することなく、長期の使用に亘ってすぐれた切削性能を発揮する。
これに対して、硬質被覆層の上部層にＴｉＯ２、Ｔｉ３Ｓ４を含むＴｉ化合物相が形成されておらず、しかも、α型Ａｌ２Ｏ３相含有割合の小さい従来被覆工具１〜５、あるいは、硬質被覆層の上部層にκ型Ａｌ２Ｏ３相が存在しない参考被覆工具６〜１０においては、チッピング発生あるいは耐摩耗性の劣化等によって、比較的短時間で使用寿命に至ることが明らかである。
From the results shown in Tables 8 to 10, according to the present invention coated tools 1 to 10, the upper layer of the hard coating layer is a mixed structure layer of α-type Al 2 O 3 phase, κ-type Al 2 O 3 phase and Ti compound phase. And the α-type Al 2 O 3 phase content ratio in the mixed structure layer is 0.6 to 0.9, and at least TiO 2 and Ti 3 S 4 are contained as the Ti compound phase, and the Ti 3 S 4 Has an orientation that satisfies Tc (100)> 2, so that it can be lubricated with the work material in high-speed intermittent cutting of steel and cast iron in which intermittent and impact loads are repeatedly applied to the cutting edge. It excels in cutting performance over a long period of time without causing chipping.
On the other hand, conventional coated tools 1 to 5 in which the Ti compound phase containing TiO 2 and Ti 3 S 4 is not formed in the upper layer of the hard coating layer and the α-type Al 2 O 3 phase content is small. Alternatively, in the reference coated tools 6 to 10 in which the κ-type Al 2 O 3 phase does not exist in the upper layer of the hard coating layer, the service life is reached in a relatively short time due to occurrence of chipping or deterioration of wear resistance. Is clear.
上述のように、この発明の被覆工具は、各種の鋼や鋳鉄などの通常条件の切削加工は勿論のこと、高熱発生を伴うとともに切刃に対して断続的かつ衝撃的負荷が作用する高速断続切削加工でも、すぐれた潤滑性を発揮するとともにチッピングの発生を抑えることができ、長期に亘ってすぐれた切削性能を発揮するものであるから、切削装置の高性能化並びに切削加工の省力化および省エネ化、さらに低コスト化に十分満足に対応できるものである。 As described above, the coated tool of the present invention is not only for cutting under normal conditions such as various types of steel and cast iron, but also for high-speed intermittent operation with high heat generation and intermittent and impact load acting on the cutting blade. Even in cutting, it exhibits excellent lubricity and suppresses the occurrence of chipping, and exhibits excellent cutting performance over a long period of time. It can cope with energy saving and cost reduction sufficiently satisfactorily.
Claims (1)
（ａ）下部層は、チタンの炭化物層、窒化物層、炭窒化物層、炭酸化物層および炭窒酸化物層のうちの１層または２層以上からなり、かつ、３〜２０μｍの合計平均層厚を有するチタン化合物層からなり、
（ｂ）上部層は、１〜１５μｍの平均層厚を有し、α型の結晶構造を有する酸化アルミニウム相、κ型の結晶構造を有する酸化アルミニウム相およびチタン酸化物とチタン硫化物を少なくとも含むチタン化合物相との混合組織層からなり、
（ｃ）上記上部層において、κ型の結晶構造を有する酸化アルミニウム相との合量に占めるα型の結晶構造を有する酸化アルミニウム相の含有割合は６０〜９０％であり、
（ｄ）上記上部層における、チタンとアルミニウムと酸素と硫黄の合計量に占めるチタンの含有割合は０．３〜３原子％、また、硫黄の含有割合は０．１〜２原子％であり、さらに、チタン硫化物はＴｃ（１００）＞２を満足する配向性を備えている、
ことを特徴とする表面被覆切削工具。 In a surface-coated cutting tool in which a hard coating layer composed of a lower layer and an upper layer is vapor-deposited on the surface of a tool base composed of a tungsten carbide-based cemented carbide or a titanium carbonitride-based cermet,
(A) The lower layer is composed of one or more of a titanium carbide layer, a nitride layer, a carbonitride layer, a carbonate layer, and a carbonitride layer, and has a total average of 3 to 20 μm. It consists of a titanium compound layer having a layer thickness,
(B) The upper layer has an average layer thickness of 1 to 15 μm and includes at least an aluminum oxide phase having an α-type crystal structure, an aluminum oxide phase having a κ-type crystal structure, and titanium oxide and titanium sulfide. It consists of a mixed tissue layer with a titanium compound phase,
(C) In the upper layer, the content ratio of the aluminum oxide phase having an α-type crystal structure in the total amount with the aluminum oxide phase having a κ-type crystal structure is 60 to 90%,
(D) The content ratio of titanium in the total amount of titanium, aluminum, oxygen and sulfur in the upper layer is 0.3 to 3 atomic%, and the content ratio of sulfur is 0.1 to 2 atomic%. Further, the titanium sulfide has an orientation satisfying Tc (100)> 2.
A surface-coated cutting tool characterized by that.
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