JPH0531602A - Cutting tool member made of surface covered tungsten carbide group super hard alloy - Google Patents

Abstract

PURPOSE:To arrange that the bad effect of C1 dissolving solidly together with Al may be ignored and Al solid solution hard covered layer hardness and toughness may not be reduced, by limiting Al content contained in an Al solid solution hard covered layer to be formed at a WC group super hard alloy base body surface at 1X10<-5> to 1X10<-3> atom% in the whole formation. CONSTITUTION:At the surface of a tungsten carbide group super hard alloy base body, a hard covered layer which consists of a single layer of one kind or plural layers of more than two kinds out of a Ti carbide, a nitride and a carbon-nitride and whose average layer thickness is 0.5-20mum, is formed. In this instance, the hard covered layer contains 1X10<-5> to 1X10<-3> atom% Al in the whole formation, and also the Al content becomes maximum at a surface bordering on the base body and becomes less toward the outer surface and becomes minimum at the outer surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is excellent not only when it is used for high-speed continuous cutting but also when it is used for milling cutting under more severe conditions, because the hard coating layer hardly peels off. The present invention relates to a surface-coated tungsten carbide-based cemented carbide cutting tool member exhibiting wear resistance and fracture resistance.

[0002]

2. Description of the Related Art Generally, tungsten carbide (hereinafter referred to as WC
Is shown on the surface of the base cemented carbide substrate.
Method) to form a hard coating layer composed of a single layer of Ti carbide, a nitride, and a carbonitride of Ti (hereinafter, respectively represented by TiC, TiN, and TiCN) or a multilayer of two or more species. Surface-coated WC-based cemented carbide cutting tool member or TiC, TiN and T by CVD method
Among iCN, a lower layer composed of one kind of single layer or two or more kinds of multilayers and titanium carbonate, titanium oxycarbonitride, titanium nitride and aluminum oxide (hereinafter referred to as TiCO, Ti
CNO, TiN, and Al ₂ O ₃ ) (a CW, TiN, and Al ₂ O ₃ ) surface-coated WC-based cemented carbide cutting formed by forming a hard coating layer composed of an upper layer composed of one single layer or two or more multiple layers Tool members are known.

On the surface of the WC-based cemented carbide substrate,
When a single layer of TiC, TiN and TiCN or a multi-layer of two or more layers is formed by the CVD method, AlCl ₃ in the reaction gas is 0.1: 1 to TiCl ₄ .
TiC and TiN with a solid solution of Al added at a ratio of 5: 1
And a hard coating layer composed of one kind of TiCN or two or more kinds of multilayers (hereinafter, these hard coating layers are referred to as Al.
A surface-coated cutting tool member formed by forming a solid solution hard coating layer) is also known (see JP-A-62-146264).

Al formed by adding AlCl ₃
The solid solution hard coating layer contributes to the cost reduction of the hard layer coated cutting tool because the coating time is shorter than the conventional hard coating layers such as TiC, TiN, TiCN, etc., and the crystal grains of the hard coating layer are also made finer. Since the adhesion to the substrate is also improved, a surface-coated cutting tool member having excellent peeling resistance can be provided, and recently it has begun to be particularly noticed.

[0005]

However, the above-mentioned AlCl
Increasing the proportion of ₃ added to the reaction gas also increases the Cl content contained in the hard coating layer, thereby decreasing the hardness and toughness of the hard coating layer.
l When a cutting tool having a solid solution hard coating layer is applied to cutting under severe conditions, there is a problem that it cannot be used due to rapid wear.

[0006]

Therefore, the present inventors have
As a result of research to solve such problems,

(A) The Al content in the Al solid solution hard coating layer formed on the surface of the substrate is 1 × 10 ^-5 to 1 in terms of the total composition.
When it is limited to × 10 ^-3 atomic%, C which forms a solid solution with Al
The adverse effect of 1 can be neglected, and the hardness and toughness of the Al solid solution hard coating layer are not reduced.

(B) The Al content of the solid solution hard coating layer is maximized at the interface with the substrate, the Al content is reduced toward the surface of the hard coating layer, and the Al content on the surface is minimized. More preferably, the minimum value is 1/5 of the maximum value.
In the following, the crystal grains at the interface portion of the hard coating layer with the substrate are refined to improve the adhesion to the substrate, and the Al and Cl contents on the surface of the hard coating layer are extremely small, so that the hardness and Toughness is TiC, TiN, Ti
It is maintained at a level almost equal to or higher than that of a hard coating layer such as CN. Therefore, when an Al solid solution hard coating layer having the above concentration distribution is formed on a substrate, a hard coating layer excellent in hardness and toughness can be firmly adhered. I got the knowledge that I can.

The present invention has been made on the basis of such findings, and the overall composition is Al: 1 × 10 ⁻⁵ to 1 ×.
A surface-coated WC-based cemented carbide cutting tool member obtained by coating the surface of a WC-based cemented carbide substrate with an Al-dissolved hard coating layer containing 10 ^-3 atomic%, wherein
The content is maximum at the interface with the substrate, decreases toward the surface, becomes minimum at the surface, and more preferably the minimum value is 1/5 or less of the maximum value. Surface-coated WC-based cemented carbide cutting tool. It is characterized by members.

Al is added to the hard coating layer in a total composition of 1 × 10 ^-5
In order to contain 1 to 10 × 10 ⁻³ atomic%, the AlCl ₃ gas in the vapor deposition reaction gas should be in a molar ratio with respect to TiCl ₄ gas such that AlCl ₃ / TiCl ₄ = 10 ⁻⁴ to 10 ^−2. This is achieved by adding AlCl ₃ gas and decreasing the amount of AlCl ₃ gas added with the reaction time.

The average layer thickness of the Al solid solution hard coating layer is 0.
It is preferable that the thickness is in the range of 5 to 20 μm. If the layer thickness is less than 0.5 μm, desired wear resistance cannot be obtained. On the other hand, if the layer thickness exceeds 20 μm, the hard coating layer may be chipped or chipped. It is not preferable because it occurs.

Further, the Al solid solution hard coating layer is used as a lower layer, and the hard coating layer composed of the lower layer and the upper layer is W.
The cutting tool member can be manufactured by forming it on the surface of a C-based cemented carbide substrate, but the average layer thickness of the upper layer formed at this time is preferably within the range of 0.1 to 10 μm, If the layer thickness is less than 0.1 μm, desired abrasion resistance cannot be ensured, while if the layer thickness exceeds 10 μm, chipping or chipping occurs in the upper layer, which is not preferable.

If the Al content contained in the Al solid solution hard coating layer is less than 1 × 10 ^-5 atomic% in the total composition, it is sufficient to improve wear resistance due to densification, strength and adhesion to the substrate. No effect can be obtained. On the other hand, when it exceeds 1 × 10 ⁻³ atomic%, a large amount of Cl is included in the Al solid solution hard coating layer, and the characteristic deterioration accompanied by a decrease in hardness and toughness due to Al and Cl is remarkable. It is not preferable because it begins to appear in. Therefore, the Al content of the Al solid solution hard coating layer is set to 1 × 10 ⁻⁵ to 1 × 10 ⁻³ atom%.

Further, the Al content of the Al solid solution hard coating layer should have a concentration distribution in which it takes a maximum value at the interface with the substrate, decreases toward the surface, and takes a minimum value at the surface. The minimum value of the Al content on the surface of the Al solid solution hard coating layer is 1/5 or less of the maximum value of the Al content at the interface with the substrate, so that a more excellent effect can be obtained. .

[0015]

EXAMPLES The surface-coated WC-based cemented carbide cutting tool member of the present invention will be specifically described based on Examples.

Throwaway chips having substantially the same composition as shown in Table 1 and having a shape corresponding to JIS SNG432 were prepared, and these throwaway chips were used as WC-based cemented carbide substrates A to E. I prepared.

[0017]

[Table 1]

Example 1 The above WC-based cemented carbide substrate A was loaded into a normal chemical vapor deposition apparatus, the inside of the chemical vapor deposition apparatus was maintained at a temperature of 1030 ° C. and a pressure of 100 Torr, and a basic reaction gas was 4%. TiCl
₄ -5% CH ₄ - under a stream of remaining H _2, at the same time AlC
l ₃ gas was added to TiCl ₄ gas at a molar ratio of AlCl ₃ / TiCl ₄ = 8 × 10 ⁻³ at the start of the reaction, and the amount of AlCl ₃ gas was decreased with the reaction time. AlCl ₃ gas addition amount of A is A
The coated cutting tool 1 of the present invention was produced by supplying the liquid so as to be 1Cl ₃ / TiCl ₄ = 8 × 10 ⁻⁴ and forming a hard coating layer made of an Al solid solution TiC layer having an average layer thickness of 8 μm.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 1 of the present invention, the Al content in the innermost surface and the outermost surface were measured by the depth direction analysis by IMA, and the measurement results are shown. The results are shown in Table 2.

Example 2 The above WC-based cemented carbide substrate E was charged into a normal chemical vapor deposition apparatus, the inside of the chemical vapor deposition apparatus was maintained at a temperature of 1030 ° C. and a pressure of 100 Torr, and 4% as a basic reaction gas. Ti
Cl ₄ -5CH ₄ - flowing the remainder H _2, the inner the chemical vapor deposition device in succession, temperature: 980 ° C., pressure: held in 100 Torr, the basic reaction _{gas: 4% TiCl 4 -8% N} 2 - remaining H ₂ AlCl ₃ gas is also added and made to flow at the same time while flowing, and AlCl ₃ / TiCl ₄ = 1 × 10 in molar ratio with respect to the above AlCl ₃ gas and TiCl ₄ gas at the start of the reaction.
^-2 so that the amount of AlCl ₃ gas at the end of the reaction is AlCl ₃ / T in a molar ratio.
It was supplied so that iCl ₄ = 5 × 10 ^−3, and the average layer thickness:
3 μm Al solid solution TiC layer (first layer) and average layer thickness:
A hard coating layer composed of an Al solid solution TiN layer (second layer) having a thickness of 1 μm was formed to prepare a cutting tool 2 coated with the present invention.

The overall composition of Al contained in the obtained hard coating layer of the coated cutting tool 2 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface ( The Al content in the outermost surface of the second layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Example 3 The above WC-based cemented carbide substrate B was loaded into a normal chemical vapor deposition apparatus, the inside of the chemical vapor deposition apparatus was maintained at a temperature of 1030 ° C. and a pressure of 100 Torr, and a basic reaction gas was 4%. TiCl
₄ -5% CH ₄ - flowing the remainder H _2, followed by the chemical vapor deposition apparatus internal temperature: 1000 ° C., pressure: held in 100 Torr, the basic reaction _{gas: 4% TiCl 4 -3% CH} 4 -4%
N ₂ -The rest of H ₂ is flown and further continued, temperature: 1030
Basic reaction gas: 4% T under conditions of ℃, pressure: 100 Torr
iCl ₄ -5% CH ₄ -remaining H ₂ at a temperature of 980 ° C.
Pressure: 100 Torr, basic reaction gas: 4% TiC
l ₄ -8% H ₂ -remaining H ₂ was flown, and at the same time, AlCl ₃ gas was mixed with TiCl ₄ gas at a molar ratio of A at the start of the reaction.
lCl ₃ / TiCl ₄ = 7 × 10 ^−3, and the amount of AlCl ₃ gas supplied was decreased with the reaction time. The amount of AlCl ₃ gas added at the end of the reaction was A
lCl ₃ / TiCl ₄ = 1 × 10 ⁻³ , the average layer thickness: 1 μm of Al solid solution TiC layer (first layer), the average layer thickness: 1 μm of Al solid solution TiCN layer (second layer) ), An average layer thickness: 6 μm of Al solid solution TiC layer (third layer), an average layer thickness: 1 μm of Al solid solution TiN layer (fourth layer). Was produced.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 3 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface. (Al content in the outermost surface of the fourth layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Example 4 Using the above-mentioned WC-based cemented carbide substrate D, the basic reaction gas was made to flow at the temperature and pressure shown in Example 2 while at the same time A
The reaction is carried out so that lCl ₃ gas and TiCl ₄ gas are in a molar ratio such that the reaction starts: AlCl ₃ / TiCl ₄ = 1 × 10 ⁻³ , and the reaction ends: AlCl ₃ / TiCl ₄ = 1 × 10 ^−4. Supplying so as to decrease with time, average layer thickness: 2 μm Al solid solution TiN layer (first layer), average layer thickness: 5 μm Al solid solution TiC layer (second layer), average layer thickness: 2 μm Al A solid solution TiN layer (third layer) was formed, and a cutting tool 4 coated with the present invention was produced.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 4 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface ( The Al content in the outermost surface of the third layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Example 5 Using the above-mentioned WC-based cemented carbide substrate C, while flowing a basic reaction gas at the temperature and pressure shown in Example 3, at the same time A
The reaction is carried out so that lCl ₃ gas and TiCl ₄ gas are in a molar ratio such that the reaction start time is AlCl ₃ / TiCl ₄ = 5 × 10 ⁻⁴ and the reaction end time is AlCl ₃ / TiCl ₄ = 1 × 10 ^−4. Supplying so as to decrease with time, average layer thickness: 1 μm Al solid solution TiC layer (first layer), average layer thickness: 0.5 μm Al solid solution TiN layer (second layer), average layer thickness: 5 μm Al solid-solved TiCN layer (third layer) having an average layer thickness of 1 μm was formed as a hard coating layer, and a coated cutting tool 5 of the present invention was produced.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 5 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface ( The Al content in the outermost surface of the fourth layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Example 6 Using the above WC-based cemented carbide substrate B, while flowing a basic reaction gas at the temperature and pressure shown in Example 3, A
The reaction is carried out such that lCl ₃ gas and TiCl ₄ gas are in a molar ratio such that the reaction starts: AlCl ₃ / TiCl ₄ = 5 × 10 ⁻³ , and the reaction ends: AlCl ₃ / TiCl ₄ = 5 × 10 ^−4. Supplying so as to decrease with time, average layer thickness: 2 μm Al solid solution TiC layer (first layer), average layer thickness: 1 μm Al solid solution TiCN layer (second layer), average layer thickness: 5 μm Al A hard coating layer made of a solid solution TiC layer (third layer) was formed to prepare a cutting tool 6 coated with the present invention.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 6 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface ( The Al content in the outermost surface of the third layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Example 7 Using the above-mentioned WC-based cemented carbide substrate A, the basic reaction gas was flowed at the temperature and pressure shown in Example 1, and at the same time A
The reaction is carried out so that lCl ₃ gas and TiCl ₄ gas are in a molar ratio such that the reaction start time is AlCl ₃ / TiCl ₄ = 1 × 10 ^-2 , and the reaction end time is AlCl ₃ / TiCl ₄ = 1 × 10 ^-3. Supply so that it decreases with time,
A hard coating layer made of an Al solid solution TiC layer (single layer) having an average layer thickness of 6 μm was formed, and a cutting tool 7 coated with the present invention was produced.

The overall composition of Al contained in the hard coating layer of the coated cutting tool 7 of the present invention, the Al content in the innermost surface and the outermost surface were measured by IMA depth analysis,
The measurement results are shown in Table 2.

Example 8 Using the above WC-based cemented carbide substrate C, TiCN of Example 3
While flowing the basic reaction gas at the temperature and pressure for obtaining the layer, at the same time, the AlCl ₃ gas in a molar ratio to the TiCl ₄ gas, at the start of the reaction: AlCl ₃ / TiCl ₄ = 6 × 10 ⁻³ , the end of the reaction Time: AlCl ₃ / TiCl ₄ = 1 × 10 ^{−4 The} supply was made so as to decrease with the reaction time,
A hard coating layer made of an Al solid solution TiCN layer (single layer) having an average layer thickness of 10 μm was formed, and a coated cutting tool 8 of the present invention was produced.

The overall composition of Al contained in the hard coating layer of the coated cutting tool 8 of the present invention, the Al content in the innermost surface and the outermost surface were measured by the depth direction analysis by IMA,
The measurement results are shown in Table 2.

Example 9 Using the above WC-based cemented carbide substrate E, the basic reaction gas was made to flow at the temperature and pressure shown in Example 3 while at the same time A
The reaction is carried out so that lCl ₃ gas and TiCl ₄ gas are in a molar ratio such that the reaction starts: AlCl ₃ / TiCl ₄ = 6 × 10 ⁻³ , and the reaction end: AlCl ₃ / TiCl ₄ = 8 × 10 ^−4. Supplying so as to decrease with time, average layer thickness: 1 μm Al solid solution TiN layer (first layer), average layer thickness: 1 μm Al solid solution TiCN layer (second layer), average layer thickness: 6 μm Al A hard coating layer consisting of a solid solution TiN layer (third layer) and an Al solid solution TiC layer (fourth layer) having an average layer thickness of 1 μm was formed, and a coated cutting tool 9 of the present invention was produced.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 9 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface ( The Al content in the outermost surface of the fourth layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Example 10 Using the above WC-based cemented carbide substrate D, at the same time as the basic reaction gas was made to flow at the temperature and pressure shown in Example 3, A
The reaction is carried out so that lCl ₃ gas and TiCl ₄ gas are in a molar ratio such that the reaction starts: AlCl ₃ / TiCl ₄ = 3 × 10 ⁻³ , and the reaction ends: AlCl ₃ / TiCl ₄ = 3 × 10 ^−4. Supplying so as to decrease with time, average layer thickness: 2 μm Al solid solution TiC layer (first layer), average layer thickness: 2 μm Al solid solution TiCN layer (second layer), average layer thickness: 2 μm Al A hard coating layer composed of a solid solution TiC layer (third layer) and an Al solid solution TiCN layer (fourth layer) having an average layer thickness of 2 μm is formed, and the coated cutting tool 10 according to the present invention is formed.
Was produced.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 10 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface ( The Al content in the outermost surface of the fourth layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Example 11 Using the above WC-based cemented carbide substrate B, the basic reaction gas was made to flow at the temperature and pressure shown in Example 3 while at the same time A
The reaction is carried out so that lCl ₃ gas and TiCl ₄ gas are in a molar ratio such that the reaction start time is AlCl ₃ / TiCl ₄ = 1 × 10 ^-2 , and the reaction end time is AlCl ₃ / TiCl ₄ = 5 × 10 ^-3. Supplying so as to decrease with time, a hard coating layer composed of an Al solid solution TiCN layer (first layer) having an average layer thickness: 3 μm and an Al solid solution TiC layer (second layer) having an average layer thickness: 6 μm is formed. The coated cutting tool 11 of the present invention
Was produced.

The overall composition of Al contained in the hard coating layer of the obtained coated cutting tool 11 of the present invention, the Al content in the innermost surface (Al content in the innermost surface of the first layer) and the Al content in the outermost surface ( The Al content in the outermost surface of the second layer) was measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Comparative Example 1 In Example 1, AlCl ₃ gas was mixed with TiCl ₄ gas in a molar ratio of AlCl ₃ / TiCl ₄ = 2 × 10.
^-3 (constant) is supplied, a hard coating layer made of an Al solid solution TiC layer having an average layer thickness of 10 μm is formed to prepare a comparative coated cutting tool 1, and the comparative coated cutting tool 1 is hard. The total composition of Al contained in the coating layer, the Al content in the innermost surface and the outermost surface were measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Comparative Example 2 In Example 8, AlCl ₃ gas was mixed with TiCl ₄ gas in a molar ratio of AlCl ₃ / TiCl ₄ = 8 × 10.
^-5 (constant) is supplied, a hard coating layer made of an Al solid solution TiCN layer having an average layer thickness of 10 μm is formed to prepare a comparative coated cutting tool 2, and the comparative coated cutting tool 2 is hard. The total composition of Al contained in the coating layer, the Al content in the innermost surface and the outermost surface were measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

Comparative Example 3 In Example 2, AlCl ₃ gas was mixed with TiCl ₄ gas in a molar ratio of AlCl ₃ / TiCl ₄ = 5 × 10 5.
⁻² (constant) except that the TiC layer (first layer) and T having the same average layer thickness and the same average thickness as in Example 2 were used.
A hard coating layer composed of an iN layer (second layer) is formed to produce a comparatively coated cutting tool 3, and the overall composition of Al contained in the hard coating layer of the comparative cutting tool 3 and the Al content in the innermost surface and the outermost surface. The amount was measured by depth analysis by IMA, and the measurement results are shown in Table 2.

Comparative Example 4 In Example 3, AlCl ₃ gas was mixed with TiCl ₄ gas in a molar ratio of AlCl ₃ / TiCl ₄ = 3 × 10.
^-2 (constant) except that the TiC layer (first layer) and TiC having the same average layer thickness under exactly the same conditions as in Example 3 were used.
A hard coating layer composed of an N layer (second layer), a TiC layer (third layer), and a TiN layer (fourth layer) is formed to produce a comparatively coated cutting tool 4, and the comparatively coated cutting tool 4 has a hard coating layer. The total composition of Al contained in the layer, the Al content in the innermost surface and the outermost surface were measured by depth direction analysis by IMA, and the measurement results are shown in Table 2.

With respect to the coated cutting tools 1 to 11 of the present invention and the comparative cutting tools 1 to 4 thus produced, cutting material: SNCM439 (hardness: H _B 260), cutting speed: 200 m / min, feed: 0 Steel milling test is performed under the following conditions: 0.3 mm / blade, depth of cut / 1.5 mm, cutting time: 15 min, cooling oil: none, and the flank wear width of the cutting edge is measured and the cutting edge condition is also observed. The measurement results are also shown in Table 2.

[0045]

[Table 2]

From the results shown in Table 2, all of the cutting tools 1 to 11 of the present invention show normal wear in 15 minutes of milling, while the Al content is the entire composition. Comparative coated cutting tool 1 having a hard coating layer having no concentration difference between the innermost surface and the outermost surface even if the conditions of
It can be seen that the comparative coated cutting tools 2 to 4 in which the overall composition of the Al content is out of the conditions of the present invention cannot withstand milling cutting for 15 minutes, and abnormal wear or chipping occurs within 15 minutes. .

The above Examples 1 to 11 and Comparative Example 1
The high-speed continuous cutting test is not particularly performed on the cutting tools 1 to 11 of the present invention and the comparative cutting tools 1 to 4 obtained in Nos. 4 to 4, but the fact that they can withstand the above-mentioned severe milling cutting test is It also suggests that sufficient wear resistance can be exhibited.

Conventional Examples 1 to 7 TiC, TiN, TiCN, and T containing no Al under the following conditions directly on the surface of the WC-based cemented carbide substrate shown in Table 1.
The conventional coated cutting tools 1 to 7 shown in Table 3 were prepared by coating a single layer of iCO, TiCNO and Al ₂ O ₃ or a multilayer of two or more types.

The above TiC, TiN, TiCN, TiC
The conditions for forming a hard layer of O, TiCNO and Al ₂ O ₃ by the chemical vapor deposition method are as follows.

(A) In the case of TiC Temperature: 1030 ° C. Pressure: 100 torr Reaction gas composition: 4% TiCl ₄ -5% CH ₄ -91% H
₂ , (b) In the case of TiN Temperature: 980 ° C, Pressure: 100 torr, Reaction gas composition: 4% TiCl ₄ -8% N ₂ -88%
In the case of H ₂ , (c) TiCN Temperature: 1000 ° C., Pressure: 100 torr, Reaction gas composition: 4% TiCl ₄ -3% CH ₄ -4% N ₂
-89% H ₂ , (d) In case of TiCO Temperature: 1000 ° C, Pressure: 100 torr, Reaction gas composition: 4% TiCl ₄ -6% CO-90%
In the case of H ₂ , (e) TiCNO Temperature: 1000 ° C., Pressure: 100 torr, Reaction gas composition: 4% TiCl ₄ -3% CO-3% N _2-
90% H ₂ , (f) Al ₂ O ₃ Temperature: 1000 ° C, Pressure: 100 torr, Reaction gas composition: 3% AlCl ₃ -5% CO ₂ -92% H
₂ ,

[0051]

[Table 3]

Examples 12 to 18 The coated cutting tool 5 of the present invention produced in Examples 5 to 11 above.
.About.11 as a lower layer, and on top of this lower layer, an Al-free T having an average layer thickness shown in Table 4 is further provided.
The upper layer is coated with one or more of iCO, TiN, TiCNO and Al ₂ O ₃ under exactly the same conditions as those shown in the conventional examples 1 to 7, and the coated cutting tools 12 to 18 of the present invention are coated. Was produced.

[0053]

[Table 4]

The conventional coated cutting tools 1 to 7 and the coated cutting tools 12 to 18 of the present invention thus produced were also subjected to the same milling cutting test as the test conditions conducted in Examples 1 to 11 above. While measuring the flank wear width of the blade, the cutting edge condition was also observed, and these results are shown in Table 5.

[0055]

[Table 5]

From the results shown in Tables 3 to 5, the conventional coated cutting tools 1 to 7 consisting only of a hard coating layer containing no Al are shown.
Chipping occurs within 15 minutes, whereas the coated cutting tools 12 to 18 of the present invention, which have formed a lower layer containing 1 × 10 ⁻⁵ to 1 × 10 ⁻³ atomic% of Al in the overall composition, are Also, it can be seen that the wear situation becomes normal wear after milling for 15 minutes.

Further, the coated cutting tools 12 to 18 of the present invention capable of withstanding the above-mentioned severe milling cutting test.
Suggests that sufficient wear resistance can be exhibited even for high-speed continuous cutting.

[0058]

The surface coated tungsten carbide based cemented carbide cutting tool member of the present invention does not cause abnormal wear or chipping even under severe cutting such as milling cutting in which a hard coating layer is directly impacted, Since it has an excellent tool life, it has an outstanding effect in the cutting field.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Roland Haubner             Austria A-1060 Vienna Getra             Idemarkt 9 Vienna University of Technology

Claims (4)

[Claims] 1. An average layer thickness of 0.5 to 10 consisting of a single layer of one or more of Ti carbide, nitride and carbonitride on the surface of a tungsten carbide based cemented carbide substrate.
In the surface-coated cutting tool member having a hard coating layer of 20 μm formed, the hard coating layer has a total composition of 1 × 10 ⁻⁵ to 1 × 10 ^−3.
Containing atomic% aluminum (hereinafter referred to as Al),
A surface-coated tungsten carbide-based cemented carbide cutting tool member characterized in that the Al content is maximum at the interface with the substrate, decreases toward the surface, and is minimum at the surface. 2. The Al content on the surface of the hard coating layer according to claim 1 is 1 / of the Al content at the interface with the substrate.
A surface-coated tungsten carbide-based cemented carbide cutting tool member characterized by being 5 or less. 3. An average layer thickness of 0.5 to 10 consisting of a single layer of one or more of Ti carbide, nitride and carbonitride on the surface of a tungsten carbide based cemented carbide substrate.
A lower layer having a thickness of 20 μm and an upper layer having a mean layer thickness of 0.1 to 10 μm consisting of a single layer of one or more of titanium carbonate, titanium oxycarbonitride, titanium nitride and aluminum oxide. In the surface-coated cutting tool member having the hard coating layer formed, the lower layer contains 1 × 10 ⁻⁵ to 1 × 10 ⁻³ atomic% of Al, and the Al content is the same as that of the substrate. The surface-coated tungsten carbide-based cemented carbide cutting tool member is characterized in that it becomes maximum at the interface, decreases toward the surface, and becomes minimum at the surface. 4. The surface-coated tungsten carbide according to claim 3, wherein the Al content at the interface with the upper layer of the lower layer is 1/5 or less of the Al content at the interface with the substrate. Cutting tool member made of base cemented carbide.