JPH0663900A - Water jet nozzle - Google Patents

Abstract

PURPOSE:To provide a water jet nozzle which is stronger than cemented carbide and alumina, and less expensive than sapphire and diamond, and which is excellent in cost performance. CONSTITUTION:A mixture in which WB having a grain size of 1.0 to 5.0mum and Co having a grain size of 5 to 10mum are mixed into WC having a grain size of 0.5 to 10mum is press-formed under a pressure of 1500kgf/cm<2> (approximately 147X10Pa) for obtaining a formed body of 10mm in diameter X5mm in height. This formed body is sintered for one hour under a vacuum at 1450 deg.C, 1500 deg.C, and 1550 deg.C respectively for obtaining a water jet nozzle. Since a cermet alloy that is high in hardness, dense, and excellent in toughness is used, a water jet nozzle that is inexpensive and excellent in durability as compared with the conventional one in which sapphire and diamond have been used can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet nozzle used in a water jet cutting device that uses a jet of ultra-high pressure water to crush rocks, concrete, etc., and is particularly easy to sinter. The present invention relates to a water jet nozzle using a cermet alloy having extremely high hardness and toughness and having good characteristics.

[0002]

2. Description of the Related Art Conventionally, a water jet cutting device using a jet of ultrahigh pressure water has been used for crushing rocks, concrete and the like. According to such a water jet cutting device, as shown in FIG. 13, a nozzle is provided via a Z-axis raising / lowering device 3 having an operation handle 2 on a holder part 1 which is automatically controlled two-dimensionally on the X-axis and Y-axis. The head 4 is gripped, the jet head 5 is provided at the lower end of the nozzle head 4 and the water jet jet nozzle 7 connected to the abrasive supply hose 6 is provided at the side of the nozzle head 4. The work (W) is cut into a predetermined flat shape by the water jet.

As a water jet medium used in such a conventional water jet cutting device, there are a case where only water is used and a case where an abrasive such as garnet is put in water as in the device shown in FIG. As the material of the nozzle used in the case of water containing an abrasive, the factor of hardness is the most important characteristic, and cemented carbide, B ₄ C, diamond, etc. are used. Further, in the case of only water, the hardness as much as that in the case of containing an abrasive is not required, and Al ₂ O ₃ and cemented carbide are used.

[0004]

However, the conventional water jet nozzle described above has the following problems. That is, if the medium is only water, the water pressure is 500
If it is less than kg / cm ₂ , even Al ₂ O ₃ and cemented carbide can be used for a sufficient period of time, but if it exceeds 500 kg / cm ₂ , both materials can easily be separated due to the impact of water when bubbles collapse. Durability cannot be obtained. Therefore, conventionally, when the water pressure exceeds 500 kg / cm ₂ , sapphire, diamond, etc. have been used for the nozzle.

Therefore, diamond or the like is used with or without an abrasive, and especially when the medium is water only, it is necessary to apply diamond when high-pressure water of a certain level or more is used. Etc. are expensive, and in particular, in the case of a large-sized nozzle, there is a problem that it becomes extremely expensive and industrial application becomes difficult in consideration of profitability.

The present invention has been made in view of the above problems in the prior art. It is stronger than cemented carbide and alumina, and more sapphire and diamond than erosion wear due to high pressure water of 500 kg / cm ₂ or more. Is also cheap,
The object is to provide a water jet nozzle with excellent cost performance.

[0007]

Means for Solving the Problems As a result of various studies to achieve the above-mentioned object, the present inventor has found that, in a water jet nozzle, both factors of strength and toughness are not less than a certain value in order to obtain good erosion resistance. It turned out to be necessary. From this point of view, the present inventor further focused on cermet alloys as a material capable of having strength and toughness above a certain value, and further researched them, to obtain WB powder, Co powder, and / or M powder.
oB powder, and powder of one or more kinds of MC, MN and MCN (M is one or more kinds of transition metal elements of groups 4a, 5a and 6a of the periodic table-the same in the following description). The mixed and sintered cermet alloy is one or more of MC, MN and MCN, a hard phase mainly composed of W-Co-B compound and / or Mo-Co-B compound, and a bond mainly composed of Co. It has been found that this cermet alloy has both high toughness and hardness and satisfies both the properties of hardness and toughness as a water jet nozzle.

In addition, the above-mentioned WB powder and / or Mo
Further investigation of a cermet alloy obtained by mixing and sintering B powder, Co powder, and one or more powders of MC, MN, and MCN revealed the following. The hard phase mainly composed of one or more of MC, MN and MCN is one or two of MC, MN and MCN.
More than one species and (M, W) (B, C) and / or (M,
Mo) (B, C) and / or (M, W) (B, N)
And / or (M, Mo) (B, N) and / or (M, W) (B, CN) and / or (M, Mo)
(B, CN), one or more of MC, MN and MCN are used as the core, and (M, W) (B, C) and / or (M, Mo) (B, C) and / Or (M, W) (B, N) and / or (M, Mo)
(B, N) and / or (M, W) (B, CN) and / or (M, Mo) (B, CN) may be present on the outer peripheral portion to form a core structure. The hard phase mainly composed of the W-Co-B compound is CoW.
B and CoW ₂ B ₂ and the core of CoW ₂ B ₂ and C
A core structure composed of the outer peripheral part of oWB may be formed, and the hard phase mainly composed of the Mo—Co—B compound is Co.
Consists MoB and CoMo ₂ B _2, often form a cored structure consisting of the core portion and the outer peripheral portion of the CoMo ₂ B ₂ of CoMoB.

The water jet nozzle of the invention of the present application has been made based on the above findings, and according to the invention of the present application, one or more of MC, MN and MCN and a W-Co-B compound and / Or Mo-Co-B
There is provided a water jet nozzle using a cermet alloy including a hard layer mainly containing a compound and a binder phase mainly containing Co.

The metallic Co in the binder phase is preferably 7% by weight or less. W-Co-B compound and / or Mo-
This is because if the metallic Co that does not contribute to the formation of the Co-B compound exceeds 7% by weight, the hardness is lowered.

According to the invention of the present application, a hard phase mainly containing one or more of MC, MN, and MCN and a W-Co-B compound and / or a Mo-Co-B compound are mainly contained. A sintered body composed of a hard phase and a binder phase mainly composed of Co, and a hard phase mainly composed of one kind or two or more kinds of MC, MN and MCN is one kind or two of MC, MN and MCN. More than species, and (M, W) (B,
C), (M, W) (B, N), (M, W) (B, CN)
One or more of and / or (M, Mo)
(B, C), (M, Mo) (B, N), (M, Mo)
Provided is a water jet nozzle using a cermet alloy composed of one or more of (B, CN).

Further, according to the invention of the present application, a hard phase mainly containing one or more of MC, MN and MCN and a hard phase mainly containing a W-Co-B compound and / or a Mo-Co-B compound. And a W-Co-B compound and / or a sintered body comprising a binder phase containing Co as a main component.
Alternatively, the hard phase mainly composed of the Mo-Co-B compound is C
oWB and CoW ₂ B ₂ and / or CoMoB and C
A water jet nozzle using a cermet alloy made of oMo ₂ B ₂ is provided.

In addition, according to the invention of the present application, MC, MN
And a hard phase mainly composed of one or more kinds of MCN, a hard phase mainly composed of a W-Co-B compound and / or a Mo-Co-B compound, and a sintering composed of a binder phase mainly composed of Co. The body, one of MC, MN and MCN
The hard phase mainly composed of one or more kinds is one or more kinds of MC, MN and MCN, and (M, W)
(B, C), (M, W) (B, N) and (M, W)
One or more of (B, CN) and / or one of (M, Mo) (B, C), (M, Mo) (B, N) and (M, Mo) (B, CN) or consists of two or more, made of hard phase composed mainly of W-Co-B compound is made CoWB and _{CoW 2 B 2, Mo-Co} -B
The hard phase mainly composed of compounds is CoMoB and CoMo.
A water jet nozzle using a cermet alloy composed of ₂ B ₂ is provided.

Furthermore, according to the present invention, a hard phase containing TiC as a main component, a hard phase containing W-Co-B compound as a main component and / or a hard phase containing Mo-Co-B as a main component, and Co as a main component. The hard phase mainly composed of TiC is TiC and (T
i, W) (B, C) and / or (Ti, Mo)
A water jet nozzle using a cermet alloy composed of (B, C) is provided.

Furthermore, according to the present application, a hard phase containing TiC as a main component and a hard phase containing W-Co-B compound as a main component and / or a hard phase containing Mo-Co-B compound as a main component and Co as a main component. A hard phase mainly composed of a W—Co—B compound is a Co-based sintered body.
Consists WB and CoW ₂ B _2, hard phase composed mainly of Mo-Co-B compound, water jet nozzles using a cermet alloy comprising CoMoB and CoMo ₂ B ₂ is provided.

In addition, according to the present application, a hard phase mainly composed of TiC and / or a hard phase mainly composed of a W—Co—B compound and / or a hard phase mainly composed of a Mo—Co—B compound,
And a hard phase mainly composed of TiC, which is a sintered body composed of a binder phase mainly composed of Co, and TiC and (Ti,
W) (B, C) and / or (Ti, Mo) (B,
Consist C), hard phase composed mainly of W-Co-B compound is made CoWB and _{CoW 2 B 2, Mo-Co} -B
The hard phase mainly composed of compounds is CoMoB and CoMo.
A water jet nozzle using a cermet alloy composed of ₂ B ₂ is provided.

Furthermore according to the present application WC and WC
There is provided a water jet nozzle using a cermet alloy composed of a hard phase mainly composed of an o-B compound and / or a Mo-Co-B compound, and a binder phase mainly composed of Co. The metallic Co of the binder phase is preferably 3.5% by weight or less.

The cermet alloy applied to the water jet nozzle of the invention of the present application is a raw material powder of WB and / or
Alternatively, the content of MoB is 15 to 45% by volume, the content of Co is 5 to 20% by volume, and the balance MC, MN, and MCN are one or more (M is 1 of the transition metal elements of Groups 4a, 5a, and 6a of the periodic table). After mixing and molding, the sintering temperature is 1
It is manufactured by sintering at a temperature of 300 to 1600 ° C. and a sintering time of 10 to 120 minutes.

The cermet alloy applied to the water jet nozzle of the present invention is a raw material powder containing 15 to 45% by volume of WB and / or MoB and 5 to 25% of Co.
After mixing and molding the volume% and the remaining TiC, sintering temperature 13
It is manufactured by sintering under conditions of 00 to 1600 ° C. and a sintering time of 10 to 120 minutes. Furthermore, the cermet alloy applied to the water jet nozzle of the invention of the present application is 10 to 40% by volume of WB and / or MoB in the raw material powder.
After mixing and molding 5 to 20% by volume of Co and the balance WC, the sintering temperature is 1300 to 1600 ° C. and the sintering time is 10 to 1
It is manufactured by sintering under the condition of 20 minutes.

Further, in order to produce a cermet alloy applied to the water jet nozzle of the present invention, M
One, two or more powders of C, MN and MCN, WB
And / or MoB and Co powders may be mixed and molded, and then sintered in a non-oxidizing atmosphere.

One or two of MC, MN and MCN
When mixing the powders of one or more kinds and the powders of WB and / or MoB, Co, the mixing ratio is preferably within the range of Table 1 for each component.

[0022]

[Table 1]

At this compounding ratio, WB and / or M
If oB exceeds 45% by volume, uniform sintering tends to be difficult. Further, when Co is less than 5% by volume, strength and toughness decrease. This is because the W-Co-B composite layer and / or Mo-Co-B produced by the reaction of WB and / or MoB with Co when the amount of Co decreases.
It is presumed that this is because it is difficult to form the composite layer. Further, when Co is more than 25% by volume, the binder phase becomes excessive and the hardness of the cermet alloy decreases. In addition, weight% of the compounding ratio indicates the value when TiC is selected as the MC.

Among the cermet alloys used in the water jet nozzle of the present invention having the above composition ratios, the composition of the alloy in which TiC, for example, is selected as MC is in the range shown in Table 2 or Table 3.

[0025]

[Table 2]

If the particle size of the powder is too small, the amount of oxygen in the powder increases, and pores are likely to occur in the sintered body. Conversely, if the particle size of the powder increases, the activity of the powder decreases and it becomes difficult to proceed with sintering. MC, MN and M blended from the above viewpoints
The particle size of one or more powders of CN is 0.5-45.
μm, especially about 0.7-10 μm is preferable. The particle size of WB and / or MoB is preferably 0.8-10 μm, more preferably 1.0-5.0 μm. Co may be about 10.0 μm or less.

This compact can be sintered by a pressureless sintering method. The atmosphere is preferably a non-oxidizing atmosphere such as nitrogen, argon or vacuum. Of course, it can be sintered by hot pressing or HIP, but a high-density sintered body can be obtained without using such a pressure sintering method. When the pressureless sintering method is used, the sintering temperature is preferably 1300-1600 ° C., particularly 1400-1500 ° C., and the sintering time is 10
-120 minutes, especially 30-90 minutes are preferred. In particular, if the sintering temperature is less than 1300 ° C, the sintering does not proceed sufficiently and pores tend to remain, while if it exceeds 1600 ° C, the grain growth of the hard phase becomes remarkable, which is not preferable. If the sintering time is less than 10 minutes, the pores tend to remain, while if it exceeds 120 minutes, grain growth of the hard phase tends to occur, which is not preferable.

[0028]

In the cermet alloy used in the water jet nozzle of the present invention, Co melts during sintering and promotes sintering to achieve densification, resulting in a composite material in which hard particles are firmly bonded to Co. . Moreover, as a result of the study by the present invention, this Co does not only fill the gaps between the MC, MN and MCN particles and the WB compound particles and / or the Mo-B compound particles, but a part of Co does not contain WB and / or
Or react with MoB enter the interior of the WB and / or MoB particles, CoW ₂ B ₂ and / or CoMoB
Are formed on the surface of the CoW ₂ B ₂ particles.
It was confirmed that the WB phase was formed on the surface portion of the CoMo ₂ B ₂ particles. The W-Co-B-based composite phase and / or the Mo-Co-B-based composite phase has a higher affinity for the Co matrix phase than the WB single phase and / or the MoB single phase, and therefore the water of the invention of the present application. In the cermet alloy used for the jet nozzle, W-
The bond strength between the Co-B phase and / or the Mo-Co-B phase and the Co phase is high. The W-Co-B composite phase is WB
The particles often react with Co in the sintering process and often have a core structure having a core part made of CoW ₂ B ₂ and an outer skin part made of CoWB. C
O reacts with o during the sintering process, and the core part made of CoMo ₂ B ₂ and C
A cored structure having an outer skin made of oMoB may be formed.

In addition, due to the above-mentioned sintering, a part of WB and / or MoB also reacts with MC, MN and MCN,
(M, W) (B, C), (M, W) (B, N), (M,
W) (B, CN) composite phase and / or (M, Mo)
(B, C), (M, Mo) (B, N), (M, Mo)
Forming a complex phase of (B, CN), MC, MN and MCN
The particles have a cored structure composed of a core part and an outer skin part. This skin phase is a phase containing W and / or Mo and B in a larger amount than in the core. Such {MC, MN and MCN- (M,
W) (B, C), (M, W) (B, N), (M, W)
(B, CN)} cored structure and / or (MC, MN and MCN- (M, Mo) (B, C), (M, Mo)
(B, N), (M, Mo) (B, CN)) Core structure is M
Since the affinity for Co is higher than that for C, MN and MCN phases, MC, MN and MCN particles and Co (M, W)
(B, C) and / or (M, W) (B, N) and / or (M, W) (B, CN) phase and / or (M, Mo) (B, C) and / or (M , Mo)
(B, N) and / or (M, Mo) (B, CN) phases are combined to form a so-called functionally graded structure in which the composition gradually changes from the MC, MN and MCN cores toward the Co side. The bond strength is high.

Further, Co and a part of WB and / or MoB are reacted and melted during the above-mentioned sintering, so that the melting point is lowered, and a sufficiently dense sintered body is obtained without the pressure sintering method. Could be configured.

Since the binding force between the hard particles or between the hard particles and the Co matrix phase is extremely high, the cermet alloy used in the water jet nozzle of the present invention has excellent toughness. Further, since high hardness MC, MN and MCN are used as the hard particles, and a part of low hardness Co forms a W—Co—B compound and / or a Mo—Co—B compound after sintering. The cermet alloy used in the water jet nozzle of the invention has high hardness. As a result of various studies, it was confirmed that the cermet alloy used for the water jet nozzle of the present invention has a high Vickers hardness Hv of 1800 or more.

[0032]

【Example】

Example 1 The grain size of the MC, MN and MCN is 0.5 to 10 μm.
WB with the same particle size of 1.0-5.0 μm
And the same 5-10 μm Co as shown in Table 3 (volume%)
Mixed in. 1,500 kgf / cm of these mixtures
Press molding was carried out at a pressure of ² (about 147 × 10 Pa) to obtain a compact having a diameter of 10 mm and a height of 5 mm. This molded body was vacuumed at 1450 ° C, 1500 ° C and 155 ° C, respectively.
Sintering was carried out at 0 ° C. for 1 hour to obtain a cermet alloy used in the water jet nozzle of the present invention. Table 3 shows Vickers hardness Hv (1450), H corresponding to the above sintering temperature.
v (1500) and Hv (1550) and crack resistance CR (1450), CR (1500) and CR
The value of (1550) is also shown. Note that ICP-Co is the value of Co in the binder phase measured by plasma emission analysis. That is, the sintered body was crushed to 325 mesh or less to obtain a sample for analysis, only the metal phase was selectively dissolved in the acid solution, and the non-dissolved powder was filtered and removed from the solution by a filter to remove Co in the solution. It is an analysis. Thereby, the amount of metallic Co remaining in the binder phase of the sintered body can be analyzed. In addition, in order to clarify the characteristics of the cermet alloy used in the water jet nozzle of the present invention, those having numbers in parentheses in the table are compared with the characteristics of the cermet alloy used in the water jet nozzle of the present invention. It is a comparative example.

[0033]

[Table 3]

FIG. 1 is a diagram schematically showing an X-ray diffraction result of a sintered body, which shows WC-30 vol% WB-10 vol% C.
It is an example when the product of No. o was sintered at 1500 ° C. Figure 1
As is apparent from the above, most of Co reacts with WB by sintering, and CoW ₂ B ₂ and CoWB, which are W-Co-B compounds, react.
It can be seen that

Example 2 TiC having a grain size of 0.7 μm was used as the MC, and 0.8
WB of μm and Co of 3.0 μm were mixed according to the formulation shown in Table 4. In addition, Table 4 also shows the blending element amounts as a result of mixing.

[0036]

[Table 4]

The mixture shown in Table 4 above was 1500 kg /
Press molding was performed at a pressure of cm (about 147 × 10 6 Pa) to obtain a molded body having a diameter of 10 mm and a thickness of 5 mm. This molded body was sintered in vacuum at 1450 ° C. for 60 minutes to obtain a cermet alloy used for a water jet nozzle.

2 to 5 are photographs of the structure of a cross section of a sintered body of this cermet alloy, taken by an electron microscope. The magnification of the structure photograph in each figure is 2400 times in FIG. 2 and 16000 in FIG.
4 times, 20,000 times in FIG. 4, and 75,000 times in FIG.

As shown in FIGS. 2 and 3, this cermet alloy is an extremely dense sintered body. Vickers hardness Hv is 2
It was 010.

Ti in the portions 1 to 8 shown in FIGS.
Table 5 shows the values of the contents of Co and W analyzed by an electron microscope with an energy dispersive X-front detector.

FIG. 6 shows the X-ray analysis result of the cermet alloy. From Table 5 and FIGS. 2 to 6, it was found that the composition of each phase of the cermet alloy used in the water jet nozzle of this example was as follows. The TiC particles are a cored structure having a TiC core and a (Ti, W) (B, C) skin phase. Note that (Ti,
W) (B, C) has the same face-centered cubic structure as TiC, and the diffraction peaks of TiC and (Ti, W) (B, C) overlap in FIG. The W-Co-B compound partially contains the core of CoWB and CoW ₂ B ₂
It is a cored structure having a skin phase.

[0042]

[Table 5]

Example 3 A cermet alloy used in a water jet nozzle was produced in the same manner as in Example 2 except that the formulations shown in Tables 6 and 7 were used, and the Vickers hardness and crack resistance were measured.
The measurement results are shown in Table 6 together with the composition of this cermet alloy.
It shows in Table 7. The unit of crack resistance (CR) is kg / mm
Is.

[0044]

[Table 6]

[0045]

[Table 7]

From Tables 6 and 7, it is recognized that the cermet alloy used in the water jet nozzle of this example has high hardness and toughness. Further, as the added WB increases, the Vickers hardness Hv increases, but the crack resistance CR decreases. As the amount of Co increases, the crack resistance CR slightly improves, but the Vickers hardness decreases. And, the Co / WB ratio is limited because Co is WB
If the amount is too much, the amount of Co that remains as metallic Co increases and the core structure of W—Co—B decreases, so that the decrease in hardness becomes more significant with respect to the rate of improvement in crack resistance, and the toughness increases. Hardness decrease becomes more severe than improvement. Also, if WB is larger than Co, the amount of metallic Co that does not react with WB becomes too small, and it becomes difficult to densify and sinter.

Example 4 A cermet alloy used in a water jet nozzle was produced in the same manner as in Example 3 except that the compounding amounts shown in Table 8 were used, and the Vickers hardness and crack resistance were measured. The measurement results are shown in Table 8 together with the compounding composition of this cermet alloy. As shown in Table 8, it shows high hardness and high toughness.

[0048]

[Table 8]

Example 5 The MC, MN, and MCN have a particle size of 0.5 to 10 μm.
m WC, TiC, TaC, NbC, TiN, TiCN
Using MoB and WB with a particle size of 1.0 to 5.0 μm
And 5 to 10 μm of Co and Ni were mixed according to the formulation (volume%) shown in Table 9. 1,500 kgf of these mixtures
/ Cm ² (about 147 × 10 Pa) was press-molded to obtain a molded body having a diameter of 10 mm and a height of 5 mm. This molded body is subjected to 1500 ° C, 1525 ° C and 1550 ° C, respectively
Was sintered for 1 hour to obtain a cermet alloy used for a water jet nozzle. Table 9 shows the Vickers hardness Hv (1500) and Hv (152
5) and Hv (1550) and crack resistance CR
(1500), CR (1525) and CR (155
The value of 0) is also shown. Note that ICP-Co is the value of Co in the binder phase measured by plasma emission analysis. That is, the sintered body was crushed to 325 mesh or less to be used as a material for analysis, only the metal phase was selectively dissolved in the acid solution, and the undissolved powder was removed from the solution by filtration with a filter to remove Co in the solution. It is an analysis. Thereby, the amount of metallic Co remaining in the binder phase of the sintered body can be analyzed. Nos. 1 to 21 in the table are examples of cermet alloys used in the water jet nozzle of the present invention.

[0050]

[Table 9]

It is recognized that the cermet alloys used in the water jet nozzles of the examples of the present invention all have a Vickers hardness of more than 1800 and a large crack resistance CR.

FIG. 7 is a diagram schematically showing the X-ray diffraction result of the sintered body in the example of the cermet alloy used in the water jet nozzle of the present invention, which is WC-30vo.
It is an example when 1% MoB-10vol% Co thing is sintered at 1500 degreeC. As is apparent from FIG. 10, most of Co reacts with MoB by sintering to form CoMo ₂ B ₂ and CoMoB which are Mo—Co—B compounds.

Next, No. 2 WC-5 vol% M in Table 9
The structure of a sintered body having a composition of oB-25vol% WB-10vol% Co and sintered at 1525 ° C. was observed using X-ray diffraction. The results are shown in FIG. 8. This sintered body has a WC phase, Co (Mo, W) ₂ B ₂ phase Co (Mo, W)
It was confirmed to have a multi-phase structure composed of B phase and Co phase.

In addition, TiC-15vo of No. 9 in Table 9
1% MoB-15 vol% WB-10 vol% Co having a compounding composition and sintered at 1525 ° C. The texture of the sintered body was X.
It was observed using line diffraction. As a result, this sintered body
C phase, {Ti, (Mo, W)} (B, C) phase, Co (M
It was confirmed to have a multi-phase structure composed of an o, W) ₂ B ₂ phase, a Co (Mo, W) B phase, and a Co phase. Moreover, regarding TiC, it was found that the TiC phase forms a core portion, and a so-called cored structure is formed in which the outer periphery is surrounded by {(Ti, (Mo, W)} (B, C) phase.

9 to 12 show No. 1 and No in Table 1.
2 shows a photograph of a metal microstructure of a sintered body having a composition of 2 and sintered at 1525 ° C. (2400 times that of No. 1 in FIG. 9).
FIG. 10 No. 1 16000 times, FIG. 11 No. 2 240
0 times, 16000 times that of No. 2 in FIG. 12). From the figure, it is understood that this alloy has a fine and dense structure.

The mechanical properties and erosion wear of the cermet alloys of Examples 1 to 5 used in the water jet nozzle of the present invention and various ceramics and cemented carbides were evaluated. As the mechanical properties, fold strength, hardness, and fracture toughness were measured by the following methods.

The pit strength was measured according to JIS R1601. Fracture toughness was calculated using the following Nihara's formula by the Vickers indentation method. ^{_{K I C = 0.042 · a 0.8}} · P 0.6 · E 0.4 / C 1.5 K I C: fracture toughness, a: indentation length of 1/2, P: load (2
0 kg), E: Young's modulus, C: 1/2 of crack length The hardness was measured with a load of 500 g using a Vickers hardness meter.

Next, as a method for evaluating erosion wear, a method that is as close as possible to the wear mechanism of the water jet nozzle is used. Was measured and evaluated by the depth from the reference plane. Water pressure: 1000 kg / cm ² , distance from nozzle to flat plate: 250 mm, injection time: 1 minute, inner diameter of nozzle:
The test was conducted under the condition of 1.5 mmφ. The results are shown in Table 10.

[0059]

[Table 10]

As shown in Table 10, the cermet alloys used in the water jet nozzles of Nos. 1 to 5 of the present invention are excellent in strength and toughness and exhibit good wear resistance. On the other hand, it can be seen that various ceramics and cemented carbides have excessive wear.

[0061]

As described above, according to the water jet nozzle of the present invention, since the cermet alloy having high hardness, denseness and excellent toughness is used, it is cheaper and more durable than the conventional sapphire and diamond. The excellent effect that a superior water jet nozzle can be provided is exhibited.

Further, the cermet alloy used in the water jet nozzle of the present invention has an advantage that it can be sintered at a high density under reduced pressure or normal pressure sintering without using HIP, hot pressing or the like.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an X-ray diffraction result of a sintered body in Example 1 of the present invention.

FIG. 2 is an electron micrograph of a metal microstructure of a cermet alloy used in a water jet nozzle of an example of the present invention (magnification: 2400 times).

FIG. 3 is an electron micrograph of a metal microstructure of a cermet alloy used in a water jet nozzle according to an example of the present invention (magnification: 16000 times).

FIG. 4 is an electron micrograph of a metal microstructure of a cermet alloy used in a water jet nozzle according to an example of the present invention (magnification: 26000 times).

FIG. 5 is an electron micrograph of a metal microstructure of a cermet alloy used in a water jet nozzle of an example of the present invention (magnification: 75,000 times).

FIG. 6 is an X-ray diffraction result of the cermet alloy used in the water jet nozzle according to the example of the present invention.

FIG. 7 is a diagram schematically showing an X-ray diffraction result of a sintered body according to an example of the present invention.

FIG. 8 is a diagram schematically showing an X-ray diffraction result of another sintered body according to an example of the present invention.

FIG. 9 is an electron micrograph of a metal microstructure of a cermet alloy used in a water jet nozzle according to an example of the present invention (magnification: 2400 times).

FIG. 10 is an electron micrograph of a metal microstructure of a cermet alloy used in a water jet nozzle according to an example of the present invention (magnification: 16000).

FIG. 11 is a photograph of a metal microstructure of a cermet alloy used in a water jet nozzle according to an example of the present invention, taken by an electron microscope (magnification: 2400 times).

FIG. 12 is an electron micrograph of a metal microstructure of a cermet alloy used in a water jet nozzle of an example of the present invention (magnification: 16000 times).

FIG. 13 is a diagram showing a schematic configuration of a water jet cutting device.

Claims (19)

[Claims] 1. A MC, MN, and MCN of one or more kinds (M is one or more kinds of transition metal elements of Groups 4a, 5a, and 6a of the Periodic Table) and a W-Co-B compound. A water jet nozzle characterized by using a cermet alloy comprising a hard layer containing mainly and / or a hard layer containing Mo-Co-B compound as a main component, and a binder phase containing Co as a main component. 2. The water jet nozzle according to claim 1, wherein the binder phase metal Co is 7 wt% or less. 3. One or two of MC, MN, and MCN.
A hard phase mainly composed of at least one kind (M is one or more kinds of transition metal elements of groups 4a, 5a and 6a of the periodic table) and W-
Hard phase mainly composed of Co-B compound and / or Mo
A hard body mainly composed of a hard phase mainly composed of a —Co—B compound and a binder phase mainly composed of Co, wherein the hard phase mainly composed of one or more of MC, MN and MCN is
One or more of MC, MN and MCN, and (M, W) (B, C), (M, W) (B, N), (M,
W) one or more of (B, CN) and / or (M, Mo) (B, C), (M, Mo) (B, N),
A water jet nozzle characterized by using a cermet alloy composed of (M, Mo) (B, CN). 4. The hard phase mainly composed of one kind or two or more kinds of MC, MN and MCN is one of MC, MN and MCN.
Type or two or more types of cores, and (M, W) (B,
C), (M, W) (B, N) and (M, W) (B, C
N) one kind or two kinds or more and / or one kind of (M, Mo) (B, C), (M, Mo) (B, N) and (M, Mo) (B, CN). Alternatively, the water jet nozzle according to claim 3, comprising two or more kinds of outer peripheral portions. 5. A hard phase composed mainly of one or more of MC, MN and MCN (M is one or more of transition metal elements of the periodic table 4a, 5a and 6a) and W. −
Hard phase mainly composed of Co-B compound and / or Mo
A sintered body comprising a hard phase containing a —Co—B compound as a main component and a binder phase containing a Co as a main component, and comprising W—Co—B
The hard phase mainly composed of compounds is CoWB and CoW ₂ B ₂
Consists, hard phase composed mainly of Mo-Co-B compound, water jet nozzle, characterized in that using a cermet alloy comprising CoMoB and CoMo ₂ B _2. 6. A hard phase mainly composed of a W—Co—B compound mainly comprises a cored structure consisting of a core part of CoW ₂ B ₂ and an outer peripheral part of CoWB, and mainly comprises a Mo—Co—B compound. The water jet nozzle according to claim 5, wherein the hard phase to be formed is mainly a cored structure composed of a core portion of CoMo ₂ B ₂ and an outer peripheral portion of CoMoB. 7. A hard phase mainly composed of one or more of MC, MN and MCN (M is one or more of transition metal elements of groups 4a, 5a and 6a of the periodic table) and W. −
Hard phase mainly composed of Co-B compound and / or Mo
A hard body mainly composed of a hard phase mainly composed of a —Co—B compound and a binder phase mainly composed of Co, wherein the hard phase mainly composed of one or more of MC, MN and MCN is
One or more of MC, MN and MCN, and one of (M, W) (B, C), (M, W) (B, N) and (M, W) (B, CN) or 2 or more and /
Or (M, Mo) (B, C), (M, Mo) (B,
N) and (M, Mo) (made B, CN) 1 or more kinds of hard phase composed mainly of W-Co-B compound is, CoWB and _{CoW 2 B 2, Mo-Co} -B compound A water jet nozzle characterized by using a cermet alloy composed of CoMoB and CoMo ₂ B _{2 as} a hard phase mainly composed of. 8. The hard phase mainly composed of one kind or two or more kinds of MC, MN and MCN is one of MC, MN and MCN.
Type or two or more types of cores, and (M, W) (B,
C), (M, W) (B, N) and (M, W) (B, C
One or more of N) and / or (M, Mo)
(B, C), (M, Mo) (B, N) and (M, Mo)
The water jet nozzle according to claim 7, comprising one or more of (B, CN). 9. The hard phase mainly composed of a W—Co—B compound is mainly composed of a cored structure composed of a core part of CoW ₂ B ₂ and an outer peripheral part of CoWB, and mainly composed of a Mo—Co—B compound. 9. The water jet nozzle according to claim 7, wherein the hard phase to be formed is mainly a cored structure composed of a core part of CoMo ₂ B ₂ and an outer peripheral part of CoMoB. 10. A hard phase mainly composed of TiC and WC
Hard phase mainly composed of o-B compound and / or Mo-
A hard body mainly composed of a Co—B compound and a binder phase mainly composed of Co, wherein the hard phase mainly composed of TiC includes TiC and (Ti, W) (B, C) and And / or a water jet nozzle characterized by using a cermet alloy composed of (Ti, Mo) (B, C). 11. A hard phase mainly composed of TiC is TiC.
11. The water jet nozzle according to claim 10, wherein the water jet nozzle comprises a core portion and a (Ti, W) (B, C) outer peripheral portion and / or a (Ti, Mo) (B, C) outer peripheral portion. 12. A hard phase mainly composed of TiC and WC
Hard phase mainly composed of o-B compound and / or Mo-
Hard phase composed mainly of Co-B compound, and a sintered body made of a binder phase composed mainly of Co, hard phase composed mainly of W-Co-B compound is made CoWB and CoW ₂ B ₂ , A hard phase mainly composed of Mo-Co-B compound,
A water jet nozzle characterized by using a cermet alloy composed of CoMoB and CoMo ₂ B ₂ . 13. A hard phase mainly composed of a W—Co—B compound is mainly composed of a cored structure composed of a core part of CoW ₂ B ₂ and an outer peripheral part of CoWB, and mainly composed of a Mo—Co—B compound. The water jet nozzle according to claim 12, wherein the hard phase to be formed is mainly a cored structure composed of a core portion of CoMo ₂ B ₂ and an outer peripheral portion of CoMoB. 14. A hard phase mainly composed of TiC and WC
Hard phase mainly composed of o-B compound and / or Mo-
A hard body mainly composed of a Co—B compound and a binder phase mainly composed of Co, wherein the hard phase mainly composed of TiC includes TiC and (Ti, W) (B, C) and / Or (Ti, Mo) (B, C), WC
The hard phase mainly composed of the o-B compound is CoWB and Co.
W ₂ consists B _2, hard phase composed mainly of Mo-Co-B compound, water jet nozzle, characterized in that using a cermet alloy comprising CoMoB and CoMo ₂ B _2. 15. The hard phase mainly composed of TiC is TiC.
15. The water jet nozzle according to claim 14, wherein the water jet nozzle comprises a core portion and an outer peripheral portion of (Ti, W) (B, C) and / or an outer peripheral portion of (Ti, Mo) (B, C). 16. A hard phase mainly composed of a W—Co—B compound is composed of a core part of CoW ₂ B ₂ and an outer peripheral part of CoWB, and a hard phase mainly composed of a Mo—Co—B compound is Co.
The water jet nozzle according to claim 14 or 15, comprising a core portion of Mo ₂ B ₂ and an outer peripheral portion of CoMoB. 17. A WC and W—Co—B compound and / or
Alternatively, a water jet nozzle characterized by using a cermet alloy comprising a hard phase mainly composed of a Mo-Co-B compound and a binder phase mainly composed of Co. 18. The water jet nozzle according to claim 17, wherein the binder phase metal Co is 3.5 wt% or less. 19. A hard phase mainly composed of a W—Co—B compound is composed of CoWB, or CoWB and CoW ₂ B ₂ , and a hard phase mainly composed of a Mo—Co—B compound is C.
The water jet nozzle according to claim 17 or 18, comprising oMoB, or CoMoB and CoMo ₂ B ₂ .