KR101413814B1 - Golf club head - Google Patents

Abstract

The head 2 includes a head body h1 as a first member and a face plate p1 as a second member. On the surface of the head, there is a boundary (k1) between the first member and the second member. On the surface of the head, a deposition layer is formed in a region including the boundary (k1). The temperature (Tp) in the deposition process is 150 占 폚 or less. Preferably, the deposition layer is formed by PVD. Preferably, the first member and the second member are bonded by an adhesive. Preferably, the deposition layer has a surface layer and a lower layer. Preferably, the exposed deposition layer is a TiC layer. Preferably, the total thickness (Tt) of the deposition layer is 0.5 mu m or more and 3.0 mu m or less.

Description

Golf Club Head {GOLF CLUB HEAD}

The present application is a priority claim based on Japanese Patent Application No. 2011-183128 filed on August 24, 2011, the entire contents of which are incorporated herein by reference.

The present invention relates to a golf club head.

The golf club head may be surface treated. Typical surface treatments include painting and plating.

Japanese Patent Laid-Open No. 2001-327636 discloses a golf club head coated with a coating layer formed by a gas phase coating. This publication discloses a iron head having a face plate made of a titanium alloy. Examples of vapor coatings include PVD (physical vapor deposition), CVD (chemical vapor deposition), and diffusion.

In the head described in the above document, there is a boundary between the face plate and the head main body. It has been found that when deposition is performed on a head having a boundary between members, defects occur near this boundary.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a golf club head capable of suppressing a deposition defect at a boundary between members.

A golf club head of the present invention includes a first member and a second member. On the surface of the head, there is a boundary between the first member and the second member. And a deposition layer is formed on the surface of the head in a region including the boundary. And the temperature (Tp) in the vapor deposition process is 150 占 폚 or less.

Preferably, the deposition layer is formed by PVD.

Preferably, the first member and the second member are adhered by an adhesive.

Preferably, the deposition layer has a surface layer and a lower layer.

Preferably, the exposed deposition layer is a TiC layer.

Preferably, the total thickness (Tt) of the vapor deposition layer is 0.5 mu m or more and 3.0 mu m or less.

1 is a perspective view of a golf club head according to a first embodiment of the present invention,
Fig. 2 is a front view of the head of Fig. 1,
3 is a cross-sectional view taken along line F3-F3 in Fig. 2,
4 is an enlarged cross-sectional view of the face surface,
Fig. 5 is an enlarged view of circle F5 in Fig. 2,
6 is an enlarged cross-sectional view of the face of the head according to the second embodiment,
Fig. 7 is an enlarged cross-sectional view of the face of the head according to the third embodiment. Fig.

Best Mode for Carrying Out the Invention Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings as appropriate.

As shown in Figs. 1 to 3, the head 2 is a golf club head of the iron type. The head 2 has a face 4, a hosel 6 and a soul 8. The hosel (6) has a hole (10). On the surface of the face 4, a face groove gv is formed. The description of the face groove gv is omitted in Fig.

At the center of the face 4, a shot blast treatment is carried out. All the face grooves gv are located in the area Rs where the shot blast process has been performed. On the toe side and the heel side of the face 4, there is an area Rn in which shot blasting is not performed. Symbol b1 indicates a boundary line between the region Rs and the region Rn.

The head 2 has a head body h1 as a first member and a face plate p1 as a second member. The head main body h1 (first member) is a metal. The material of the head main body h1 is stainless steel. The face plate p1 is a metal. The material of the face plate p1 is a titanium alloy. The head 2 is a cavity back iron. The shape of the head 2 is not limited.

The head body h1 has a face opening. The contour of this face opening is almost the same as the contour of the face plate p1. The face plate p1 is fitted to the face opening (see Fig. 3). The face plate p1 constitutes most of the face 4. All face grooves gv are provided on the face plate p1. In Fig. 2, a boundary k1 between the face plate p1 and the head body h1 is shown. This boundary k1 is hardly noticeable at the actual head. Therefore, in Fig. 1, the stage of the boundary k1 is omitted.

In the face 4, the face plate p1 and the head body h1 constitute the same plane IPL1). This plane PL1 is the face face. The boundary k1 is located on this plane PL1.

The face 4 is subjected to a surface treatment. The surface of the face 4 is subjected to a surface treatment. Surface treatment is deposition. In the present embodiment, PVD is employed as the deposition.

In the present embodiment, the shot blasting process is performed after the vapor deposition process. The deposition process may be performed after the shot blast process.

The face grooves gv are formed by cutting. Specifically, the face groove gv is processed by a cutter. This machining is NC machining. NC means Numerical Control. After the face grooves gv are formed, the deposition processing is performed. Therefore, the surface of the face groove gV (including the bottom face of the face groove gV) is also subjected to the vapor deposition process.

As shown in Fig. 2, the heel side ends of the face plate p1 are arranged substantially along the boundary line b1. On the other hand, the toe-side end of the face plate p1 is arranged substantially along the outline of the head 2. [ The face plate p1 has an area Rs and an area Rn. The top-right portion of the face plate p1 is the area Rn. The face plate p1 has a boundary line b1.

The surface of the face 4 is flat. The entire planar portion is vapor-deposited. The region where the deposition is performed includes the boundary k1.

Examples of the deposition include PVD (physical vapor deposition) and CVD (chemical vapor deposition). Examples of PVD include vacuum deposition, sputtering, ion plating, ion beam deposition and ion implant deposition. Examples of CVD include plasma CVD, laser-induced CVD, and photo-induced CVD. From the viewpoint of the pressure in the chamber in which the chemical reaction is carried out, examples of CVD include atmospheric pressure CVD and reduced pressure CVD. Deposition can be carried out by known equipment.

As examples of the material deposited, TiC, TiN, TiAIN, TiCN , CrN, Zr, ZrN, SiC, A1 2 O 3, BN, SiO 2, TiO 2, include ZrO _2, MgF _2. DLC (diamond-like carbon) may be used. These are known as substances to be deposited.

Fig. 4 is a sectional view of the vicinity of the surface of the head 2. Fig. On the surface of the face 4, a surface layer Ls is formed. The surface layer Ls is a vapor deposition layer. The surface layer Ls is formed by PVD. The surface layer Ls is an exposed deposition layer.

In this embodiment, TiC (titanium carbide) is used. That is, the surface layer Ls is a TiC layer. TiC shows black.

5 is an enlarged view of a circle indicated by F5 in Fig. The appearance defective portion fa is indicated by a two-dot chain line in Fig. In the head to which the present invention was not applied, an appearance defective portion fa was observed. The appearance defective portion fa forms a visible color difference as compared with the surrounding portion. The appearance defective portion fa can be visually recognized. The appearance defective part (fa) lowers the product value. If the appearance defective part fa is formed, the deposition processing needs to be re-executed (need to be repaired). In the present embodiment, the appearance defective portion fa hardly occurs. Even when the appearance defective portion fa occurs, the deposition processing can be repaired (re-executed).

A number of tests were performed to remove the appearance faults fa. As a result, it has been found that the incidence of the appearance defective portion fa can be changed depending on the conditions in the deposition process. Particularly, it has been found that the temperature (Tp) in the vapor deposition process contributes to the suppression of the appearance defective portion (fa).

The temperature Tp is preferably 150 占 폚 or lower, more preferably 140 占 폚 or lower, even more preferably 130 占 폚 or lower, and even more preferably 120 占 폚 or lower, from the viewpoint of suppressing the appearance defective portion fa. If the temperature (Tp) is too low, the deposition may become difficult or the adhesion may be deteriorated. From this viewpoint, the temperature Tp is preferably 90 DEG C or higher, more preferably 100 DEG C or higher. When there are a plurality of deposition layers, it is preferable that the temperature (Tp) satisfies the above preferable temperature range in all the deposition processes.

Conventionally, in the PVD treatment for the head, the treatment temperature Tp is a normal temperature, that is, about 300 캜. In the head having the integral structure including the face and the body, there was no problem at the above processing temperature. However, in the case where the boundaries of the plural members are present, it is found that there is a problem of appearance failure. By lowering the temperature Tp, the appearance defective portion fa was decreased.

The details of the cause of the appearance failure fa are not clear. However, the cause of the occurrence can be inferred by analyzing the results of the embodiments to be described later. One of the probable causes is that a substance (hereinafter also referred to as an inhibiting substance Pt) which inhibits deposition is present at the boundary k1. As the inhibiting substance (Pt), an adhesive, a cutting oil and a putty are exemplified. This adhesive is used for bonding the face plate p1 and the head body h1. The cutting oil is used when the face grooves gV are formed by cutting. The putty can be used to prevent the cutting oil from entering the boundary k1. Since these inhibiting substances (Pt) remain, it is considered that there arises a problem in deposition. Particularly, the adhesive is liable to flow at a high temperature. For this reason, the adhesive may flow out during the treatment at a high temperature.

The putty is a material for padding, and is used for embedding depressions, cracks, holes, and the like. Examples of the putty include epoxy putty, polyester putty, gypsum putty and calcium carbonate putty.

The adhesive is not limited. Examples of the adhesive include an acrylic adhesive, an epoxy adhesive, a urethane adhesive, and the like. From the viewpoint of bonding strength, an epoxy adhesive is preferable. From the viewpoint of heat resistance, a urethane-based adhesive is preferable. As described later, when the temperature Tp in the vapor deposition process is low, deterioration of the adhesive due to heat is suppressed. Therefore, when the temperature Tp is low, an adhesive having a relatively low heat resistance can also be used. From this viewpoint, an epoxy adhesive having a low heat resistance but an excellent adhesive strength is preferably used. When the temperature Tp is low, the degree of freedom of selection of the adhesive is improved. When the temperature Tp is low, the adhesive hardly changes, and the adhesiveness is maintained. Therefore, the face plate p1 is securely fixed.

In the head 2, the vapor deposition layer is one layer. The vapor deposition layer may be a single layer or two or more layers. Hereinafter, an example in which the vapor deposition layer has two layers will be described.

6 is an enlarged sectional view of the face 22 of the head 20 according to the second embodiment. The head 20 is the same as the head 2 of the first embodiment except that the vapor deposition layer has two layers.

In the head 20, there are a plurality of deposition layers. In the head 20, the vapor deposition layer has two layers. The surface layer Ls and the second layer Lg are deposition layers. The surface layer Ls and the second layer Lg are formed by PVD. The surface layer Ls is a TiC layer. The second layer is a CrN (chromium nitride) layer.

The second layer (Lg) is an example of the lower layer. The lower layer is the inner layer than the surface layer Ls. The lower layer may be one layer or two or more layers. The lower layer (second layer (Lg)) is in contact with the material (metal material). The material is the face plate p1 or the head main body h1.

As described above, the TiC layer shows black color. Therefore, the face 22 of the head 20 exhibits black color like the head 2. When the TiC layer is peeled off by abrasion, the CrN layer is exposed. The CrN layer exhibits a shiny metal color.

CrN layer was found to be effective in maintaining the appearance. When the TiC layer is peeled off in the case of the head 2, the metal material of the head body h1 or the face plate p1 is exposed. When the metal material is exposed, it has been found that the appearance is easily deteriorated. When the TiC layer is peeled off by use in a bunker or the like, the trace of this peeling seems like a lot of scratches. Traces that look like scratches impair the appearance. This trail gives the user a negative impression that the surface treatment layer has been removed. The TiC layer is black, and the part that lost this black is conspicuous.

When the CrN layer was present, it was found that the peeling marks were not noticeable. The detailed reason is not clear. The reason for this is presumed to be that the smoothness of the surface of the exposed portion increases when the CrN layer is present as compared with the case where the metal material is exposed. When the smoothness is high, the appearance of the surface is improved and the trace of peeling is thought to be inconspicuous. When the smoothness is high, a negative impression that the surface-treated layer is removed is hardly generated.

7 is an enlarged sectional view of the face 32 of the head 30 according to the third embodiment. The head 30 is the same as the head 2 of the first embodiment except that the vapor deposition layer has two layers.

In the head 30, a plurality of deposition layers are provided. In the head 30, the vapor deposition layer has two layers. The surface layer Ls and the second layer Lg are deposition layers. The surface layer Ls and the second layer are deposition layers. The surface layer Ls and the second layer Lg are formed by PVD. The surface layer Ls is a TiC layer. The second layer is a Zr (zirconium) layer.

As described above, the TiC layer shows black color. Therefore, the face 32 of the head 30 exhibits black color, as in the case of the head 2 described above. When the TiC layer is peeled off by abrasion, the Zr layer is exposed. The Zr layer exhibits a shiny metallic color.

Zr layer was found to be effective in maintaining the appearance. When the TiC layer is peeled off in the case of the head 2, the metal material of the head body h1 or the face plate p1 is exposed. When the metal material is exposed, it has been found that the appearance is easily deteriorated. When the TiC layer is peeled off by use in a bunker or the like, the trace of peeling looks like a lot of scratches. The trace of peeling impairs the appearance. The trace of peeling gives the user a negative impression that the surface treatment layer has been removed. The TiC layer is black, and the part that lost this black is conspicuous.

It was found that the trace of peeling was not conspicuous when the Zr layer was present. The detailed reason is not clear. The reason for this is presumably because, in the presence of the Zr layer, the smoothness of the surface of the exposed portion increases as compared with the case where the metal material is exposed. If the smoothness is high, the appearance of the surface is improved, and the trace of peeling is not conspicuous.

As shown in the head 20 and the head 30, it has been found that the presence of the second deposition layer under the surface layer improves the appearance when the surface layer is peeled off. The color of the metallic material (stainless steel, titanium alloy, etc.) resembles the color of the second layer. Therefore, it was thought that the appearance when the surface layer was peeled did not change depending on the presence or absence of the second layer. In practice, however, it has been found that the presence of the second layer improves the appearance of the surface layer when worn. This is unexpected to those skilled in the art.

The deposition process in the head 2, the head 20, and the head 30 is repaired as shown in the following embodiments. As a result, in the head 2 and the head 20, the success rate (Sr) of the number of deposition processes was found to be low. On the other hand, in the head 30, it was found that the success rate Sr is high.

In the number of deposition processes, first, the peeling process is performed. In this peeling step, a peeling agent is used. As a preferable releasing agent, H ₂ O ₂ (hydrogen peroxide) is exemplified. Next, a redeposition process is performed. The re-deposition process is the same as the original deposition process. As will be described later, it is presumed that it is difficult to completely remove CrN using H ₂ O ₂ .

The reason why the success rate Sr is high in the head 30 has been discussed. It is considered that the success rate (Sr) is high when the deposition layer is easily peeled off by the peeling agent. When the deposition layer is hardly peeled off by the peeling agent, the success rate Sr is considered to be low. In the peeling step, it is presumed that when the deposition layer remains, the remaining deposition layer causes defective deposition.

From the viewpoint of increasing the success rate (Sr), it is preferable that the deposition layer below the surface layer (Ls) has higher releasability by the releasing agent than the surface layer. As the releasing agent, hydrogen peroxide and sodium hydroxide are exemplified, preferably hydrogen peroxide. Sodium hydroxide (NaOH) was also applied, but corrosion of the face material occurred.

From the viewpoint of durability, the total thickness Tt of the vapor deposition layer is preferably at least 0.5 mu m, more preferably at least 1.0 mu m. When the thickness Tt is excessively large, peeling is likely to occur. From the viewpoints of suppression of peeling and ease of repair (modification), the total thickness Tt of the deposition layer is preferably 3.0 m or less, more preferably 2.5 m or less.

From the viewpoint of durability, the thickness of the TiC layer is preferably 0.3 mu m or more, more preferably 0.8 mu m or more. The thickness of the TiC layer is preferably 2.6 占 퐉 or less and more preferably 2.1 占 퐉 or less from the viewpoints of suppression of peeling and ease of modification.

From the viewpoint of preventing the peeling of the surface layer from being conspicuous, the thickness T2 of the lower layer is preferably 0.1 mu m or more, more preferably 0.2 mu m or more. The thickness T2 of the lower layer is preferably 0.5 占 퐉 or less and more preferably 0.4 占 퐉 or less from the viewpoints of suppression of peeling and ease of repair. The lower layer means a portion excluding the surface layer in the vapor deposition layer.

The time (Tm) required for the deposition process can be set so that the thickness of the deposition layer becomes appropriate.

Example

Hereinafter, the effects of the present invention will be apparent from the examples. However, the present invention should not be construed restrictively on the basis of the description of the embodiments.

Tests A, B, and C were performed. In Test A, only TiC was used as the deposition layer. In test B, TiC (first layer) and CrN (second layer) were used as a deposition layer. In test C, TiC (first layer) and Zr (second layer) were used as the deposition layer. The results of Test A are shown in Tables 1 and 2 below. The results of Test B are shown in Table 3 below. The results of Test C are shown in Table 4 below.

[Test A]

[Example 1a]

The same head as the head 2 was manufactured. The face grooves gV of the face plate p1 were formed by cutting (NC machining). Cutting oil was used in NC machining. The face plate p1 was press-fitted into the opening of the head body h1. In fixing the face plate p1, bonding by press fitting and adhesive were used in combination. The face plate p1 was bonded to the head body h1 by an adhesive. As the adhesive, "EW2010" (trade name) manufactured by Sumitomo 3M Limited was used. Prior to the deposition process, the face side was cleaned. For this cleaning, an organic solvent was used. Specifically, cleaning was performed by a wiping process. In the wiping process, the face side was wiped off with a cloth containing an organic solvent. After cleaning, a deposition process was performed. The type of deposition was PVD. The PVD treatment was carried out under known conditions such as vacuum conditions. The deposition layer was made of TiC. In the deposition process, the treatment temperature (Tp) was set at 150 캜. The time (Tm) required for the deposition was 80 minutes. The specifications and evaluation results of Example 1a are shown in Table 1 below.

[Examples 2a to 14a]

Except for the specifications shown in Table 1, the heads of Examples 2a to 14a were obtained in the same manner as in Example 1a. Their specifications and evaluation results are shown in Table 1 below. In Example 8a, in this cleaning, water was used in place of the solvent. In Example 9a, the adhesive was not used.

[Comparative Examples 1a to 5a]

Other than the specifications shown in Table 2, the heads of Comparative Examples 1a to 5a were obtained in the same manner as in Example 1a. The specifications and evaluation results thereof are shown in Table 2 below.

[Test B]

[Example 1b]

The same head as that of the head 20 described above was produced. The head of Example 1b was obtained in the same manner as in Example 1a, except that CrN was formed as a lower layer (second layer), and the specifications of each layer were shown in Table 3. Table 3 shows the specifications and evaluation results of Example 1b.

[Examples 2b to 10b and Comparative Examples 1b to 4b]

The heads of Examples 2b to 10b and Comparative Examples 1b to 4b were obtained in the same manner as in Example 1b except for the specifications shown in Table 3. The specifications and evaluation results thereof are shown in Table 3 below.

[Test C]

[Example 1c]

A head identical to the head 30 was manufactured. The head of Example 1c was obtained in the same manner as in Example 1a except that Zr was formed as a lower layer (second layer) and the specifications of each layer were shown in Table 4. [ The specifications and evaluation results of Example 1c are shown in Table 4 below.

[Examples 2c to 9c and Comparative Examples 1c to 4c]

The heads of Examples 2c to 9c and Comparative Examples 1c to 4c were obtained in the same manner as in Example 1c except for the specifications shown in Table 4. The specifications and evaluation results thereof are shown in Table 4 below.

The evaluation method is as follows.

[Appearance defect rate]

For each example and comparative example, ten heads were manufactured. And the appearance defective portion fa near the boundary k1 was visually confirmed. It was judged that the head in which the appearance defective part fa was visually confirmed to be defective. The appearance defect rate was evaluated in five steps based on the following criteria.

A: Defect rate less than 20%

B: Defect ratio exceeding 20% and below 40%

C: Defect rate more than 40% and less than 60%

D: Defect ratio is more than 60% and less than 80%

E: Defect rate exceeds 80%

[Number evaluation]

The deposition process was reprocessed for all heads. A peeling process and a redeposition process were carried out. In the peeling step, hydrogen peroxide solution was used as a peeling agent. Next, a redeposition process was carried out in the same manner as in the original deposition process performed on the head. Thereafter, visual defects were visually confirmed. And evaluated in three stages based on the following criteria.

A: Defect rate less than 10%

B: Defect rate is more than 10% and less than 50%

C: Defect rate exceeds 50%

[Bunker endurance test]

A shaft and a grip were attached to each of the heads of each example to manufacture a golf club. The bunker shot was performed 40 times, and the state of the soul was quantitatively evaluated by image processing (binarization). The golf club was evaluated in three stages according to the following criteria.

A: TiC (black) exfoliation and soul scratches are not noticeable

B: TiC (black) peeling and sore scratches are slightly visible

C: TiC (black) peeling and soul wounds are noticeable

The evaluation results of Tables 1 to 4 are analyzed as follows.

[Test A]

In Examples 1a to 14a, the appearance defective rate is low. This is believed to be due to the low temperature (Tp) in the deposition process. In Examples 4a to 6a in which the temperature Tp is lower, the appearance defective rate is lower. These results suggest that the adhesive acts as an inhibiting substance (Pt).

In Example 8a, water, not a solvent, is used in the cleaning step. The appearance defective ratio of Example 8a is slightly lower than that of Example 5a. From this, it is presumed that the residual of the inhibiting substance (Pt) is responsible for the appearance of the appearance defective part (fa).

In Example 9a, no adhesive is used, and the appearance defective ratio is low. In Example 10a, the time [Tm (T1)] becomes long and the thickness Tt becomes thick.

In Examples 1a to 13a, the number evaluation was good. This is probably because TiC was almost completely removed by the stripper. In Example 14a, since the thickness (Tt) was thick, evaluation of the number was not good.

In Comparative Examples 1a to 3a and 5a, the appearance defective ratio is deteriorated. It is considered that this is because the temperature Tp is high. This result suggests that the adhesive acts as an inhibiting substance (Pt).

In Comparative Example 4a, the appearance defective ratio is relatively good. In Comparative Example 4a, no adhesive was used. This result suggests that the adhesive acts as an inhibiting substance (Pt).

In Examples 1a to 13a, the bunker endurance test is not good. This is considered to be because the appearance is deteriorated by the exposure of the metal material (head body h1). In Example 14a, since the thickness (Tt) was too thick, the bunker endurance test deteriorated.

[Test B]

In Examples 1b to 10b (except for Example 5b), the appearance defective ratio is good. This is thought to be due to the low temperature Tp. This result suggests that the adhesive acts as an inhibiting substance (Pt).

In Example 5b, water is used in the cleaning step. The appearance defective ratio of Example 5b is lower than that of Example 2b. From this, it is presumed that the remnant of the inhibiting substance (Pt) is the cause of the appearance failure portion fa.

In Examples 1b to 10b, the number evaluation is not good. This is considered to be because the CrN is not completely removed by the releasing agent and the re-deposition is uneven due to the residual CrN.

In Comparative Examples 1b to 4b, the appearance defective ratio is deteriorated. It is considered that this is because the temperature Tp is high. This result suggests that the adhesive acts as an inhibiting substance (Pt).

In Examples 1b to 6b, the results of the bunker endurance test are good. It is considered that this is because CrN as a base improves the appearance.

In Example 7b, the total thickness (Tt) of the vapor deposition layer is thin. Therefore, in the bunker endurance test, TiC and CrN peeled off and the metal material (head body h1) was exposed.

[Test C]

In Examples 1c to 9c (except for Example 5c), the appearance defective ratio is good. It is considered that this is because the temperature Tp is low. These results suggest that the adhesive acts as an inhibitor (Pt).

In Example 5c, water is used in the cleaning step. The appearance defective ratio of Example 5c is lower than that of Example 1c. From this, it is presumed that the residual of the inhibiting substance (Pt) is the cause of the appearance defective portion fa.

In Examples 1c to 9c (except for Example 8c), the number evaluation is good. This is considered to be because Zr is easily removed by the stripping agent. In Example 8c, since the thickness (Tt) was too thick, the evaluation of the number deteriorated.

In Example 4c, the result of the bunker endurance test is not good. When the thickness T2 of the Zr layer is large, the difference in hardness between the surface layer Ls (TiC layer) and the second layer Lg (Zr layer) is large. Further, the difference in hardness between the head material and the second layer (Lg) is large. This is considered to be because distortion is likely to occur in the second layer (Lg) (Zr layer). This is thought to be due to the fact that cracks tend to be generated on the basis of hardness difference and distortion. From this viewpoint, the thickness of the Zr layer is preferably 0.4 mu m or less.

In Comparative Examples 1c to 4c, the appearance defective ratio is deteriorated. This is considered to be due to which of the temperatures Tp is high. This result suggests that the adhesive acts as an inhibiting substance (Pt). When there are a plurality of deposition layers, it is preferable that the temperature (Tp) is low in all deposition processes.

In Examples 1c to 9c (except for Examples 4c and 8c), the results of the bunker endurance test are good. This is considered to be because the Zr as the base improves the appearance.

In Examples 14a, 9b and 8c, the result of the bunker endurance test is not good because the total thickness Tt is thick. It is considered that even when the total thickness Tt is very thick, peeling easily occurs.

As described above, the examples are highly evaluated as compared with the comparative examples. From these evaluation results, the superiority of the present invention is apparent.

INDUSTRIAL APPLICABILITY The present invention can be applied to all golf club heads such as a wood type head, a utility type head, a hybrid type head, an iron type head, and a putter head.

The above description is merely an example, and various modifications are possible without departing from the essence of the present invention.

Claims (11)

A first member,
A golf club head comprising a second member,
Wherein a boundary between the first member and the second member exists on the surface of the head,
Wherein the surface of the head is a face surface,
A deposition layer is formed on the surface of the head in a region including the boundary,
Wherein the deposition layer has a surface layer and a second layer,
The surface layer is a TiC layer, the second layer is a CrN layer or a Zr layer,
Wherein the temperature (Tp) in the deposition process is 150 占 폚 or less. The golf club head of claim 1, wherein the deposition layer is formed by PVD. The golf club head according to claim 1, wherein the first member and the second member are bonded by an adhesive. delete delete The golf club head according to claim 1, wherein the total thickness (Tt) of the vapor deposition layer is 0.5 mu m or more and 3.0 mu m or less. The golf club head according to claim 1, wherein the thickness of the TiC layer is 0.3 탆 or more and 2.6 탆 or less. The golf club head according to claim 1, wherein the thickness of the second layer is 0.1 占 퐉 or more and 0.5 占 퐉 or less. delete delete The golf club head according to claim 1, wherein the second layer is higher in releasability by hydrogen peroxide than the surface layer.

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