JPH09174199A - Mold for continuous casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for continuous casting, which can be produced without executing heat treatment and has long service life. SOLUTION: In the mold for continuous casting, a thermal-spraying film 15 is formed on a undercoat layer 14 with an inner surface subjected to a surface roughening, the thermal-spraying film 15 is composed of a composite film consisting of a material A composed of 15-40wt.% self-fluxing alloy and a material B composed of 60-85wt.% Cr3 C2 /NiCr or WC/Co, and also, is formed by thermal-spraying while using simultaneously high speed flame thermal spraying machines 10, 11 for the material A and the material B separately, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting mold for steel or the like, and more particularly to a continuous casting mold in which a composite material having excellent heat resistance and wear resistance and requiring no heat treatment is sprayed on the inner surface.

[0002]

2. Description of the Related Art As a casting mold for continuous casting in which the inner surface is subjected to a thermal spraying treatment to increase the wear resistance, for example, Japanese Patent Publication No. Sho 61-15782
As shown in Japanese Patent Laid-Open Publication No. H06-32, after a base metal such as Ni is plated on the surface of a base material made of a precipitation hardening type copper alloy, Ni
After spraying a -Cr-based self-fluxing alloy, it is heated to about 1000 [deg.] C. to form a diffusion layer between the base material copper plate and the underlying Ni plating layer, and the thermal spray coating of the underlying Ni plating layer to form a metallurgical bond. A thermal spray coating having strong wear resistance was formed on the copper base material.

[0003]

However, in the continuous casting mold described in the above publication, 1000 ° C.
Heating to the extent will deform the base copper plate, so it is necessary to perform strain removal work, and even if strain removal is performed, it may not be possible to incorporate it into the back frame of the continuous casting mold. However, there is a problem that flatness accuracy is inferior. Further, in order to recover the strength of the base material, it is necessary to perform an age hardening heat treatment, and there is a problem that the manufacturing process is extremely complicated and various. Here, it is conceivable that the Ni—Cr-based self-fluxing alloy is not heat-treated after thermal spraying. In this case, however, the adhesion to the base material is as small as ² to 3 kg / mm ² , which makes long-term use difficult. There is a problem that is. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a continuous casting mold that can be manufactured without heat treatment and has a long life.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The continuous casting mold described above is a continuous casting mold in which a thermal spray coating is further formed on an undercoat plating layer whose inner surface is roughened, wherein the thermal spray coating is 15 to 40% by weight of a self-fluxing alloy. Material A consisting of 60 to 85% by weight of Cr ₃
It is a composite coating with a material B made of C ₂ / NiCr or WC / Co, and is formed by simultaneously spraying the materials A and B using independent high-speed flame sprayers. The continuous casting mold according to claim 2, wherein the sprayed coating is formed on the undercoating layer on the undercoating layer whose inner surface is roughened, and further the sprayed coating is formed on the undercoating layer. It is composed of an adhesive material formed of a self-fluxing alloy and a wear-resistant cermet material sprayed thereon. The continuous casting mold according to claim 3, wherein a sprayed coating is further formed on an underplating layer whose inner surface is roughened, wherein the sprayed coating is a self-dissolving compound with gradient blending. An adhesive material made of an alloy and a cermet material having wear resistance are used, and the distribution of the adhesive material on the side of the base plating layer is high. A continuous casting mold according to a fourth aspect is the continuous casting mold according to the third aspect, wherein the adhesive material and the cermet material are simultaneously sprayed by different high-speed flame sprayers. The continuous casting mold according to claim 5 is the continuous casting mold according to any one of claims 1 to 4, wherein the base plating layer is Ni, Co, F.
e, or alloy plating using these as a base material, and the surface thereof is subjected to a roughening treatment of Rz = 50 to 150 μm. In the above invention, if the thickness of the sprayed coating is less than 0.1 mm, the sprayed coating is lost due to scratches on the dummy bar or the like, and if it exceeds 1 mm, the coating is easily cracked.
It is preferably formed in the range of 1 to 1 mm. Further, the self-fluxing alloy includes NiCrSiB, CoCrSiB,
A material such as FeCrSiB is used. Further, in the continuous casting mold of the above claims 2 to 5, wherein the cermet material is self-fluxing alloy, a Ni alloy or a Co alloy and the metal _{component, Cr 3 C 2, WC,} NbC, ZrC or Si
It is preferable that C is the ceramics content and that the cermet material is 60 to 85% by weight of the total thermal spray material.

[0005]

In the continuous casting mold according to claim 1, a self-fluxing alloy and a cermet consisting of Cr ₃ C ₂ / NiCr or WC / Co are independently provided on the undercoating layer whose inner surface is roughened. Since the high-speed flame spraying machine is used for simultaneous thermal spraying, the thermal spraying can be performed depending on the proper thermal spraying conditions of the self-fluxing alloy and the cermet. That is, when a self-fluxing alloy is sprayed using a high-speed flame sprayer, the spraying distance is about 350 to 400 m.
m is appropriate, and if it is out of this range, the adhesion tends to be weak. When the cermet is sprayed using a high-speed flame spraying machine, if the spraying distance is less than 250 mm, it becomes difficult to form a film, and if it exceeds 350 mm, the wear resistance is not much different from that of the self-fluxing alloy alone. Therefore, if these materials are sprayed using one high-speed flame sprayer, it is necessary to match the spraying distance to one of the conditions, and it is not possible to spray each material under the optimum conditions. When spraying independently and simultaneously using a flame spraying machine, the spraying distance can be set according to the material, thereby forming an excellent sprayed coating of composite material. The thermal spray coating is composed of a self-fluxing alloy and a hard cermet, and the self-fluxing alloy acts as a wax material to bond the hard cermet, so that the surface is hard and can be firmly bonded. Here, the self-fluxing alloy is 15 to 40 wt% and the Cr ₃ C ₂ / NiCr or WC / Co is 60 to 85 wt% in the thermal spray material forming the thermal spray coating, but the self-fluxing alloy is 15 wt%. If less than, Cr ₃ C ₂ /
Although NiCr or WC / Co increases and wear resistance improves, there is a drawback that cracks are likely to occur. Moreover, when the self-fluxing alloy is used in an amount of more than 40% by weight, cracks and the like do not occur, but Cr ₃ C ₂ / NiCr or WC is used.
The decrease in / Co is not so different from the case where the self-fluxing alloy simple substance is sprayed.

In the continuous casting mold according to the second aspect of the present invention, an adhesive material made of a self-fluxing alloy is sprayed on the roughened undercoat layer, and then a wear-resistant cermet is sprayed. Therefore, the base plating layer and the self-fluxing alloy strongly adhere to each other. And since the wear-resistant cermet is sprayed onto the sprayed self-fluxing alloy, the adhesive strength is greater than when the cermet is sprayed directly onto the underlying plating layer, forming a stronger sprayed coating as a whole. it can.

In the continuous casting mold of the third aspect, since the self-fluxing alloy and the cermet having wear resistance are obliquely compounded and sprayed on the roughened surface-plated undercoat layer, the downward casting is performed. Since the self-fluxing alloy having a high component ratio is firmly bonded to the undercoat plating layer, and the cermet is mixed therein with a higher component ratio toward the surface, it has strong wear resistance. In addition, since each material is compounded with a gradient, the physical properties gradually change, and a stable sprayed coating can be formed.

In the continuous casting mold according to claim 4, since the self-fluxing alloy and the cermet in the continuous casting mold according to claim 3 are simultaneously sprayed by independent high-speed flame spraying machines, the respective By changing the speed of the feed material of the high-speed flame spraying machine, it is possible to easily form a spray coating having a gradient composition. Further, since the self-fluxing alloy and the cermet have different proper spraying conditions, as described above, the two high-speed flame sprayers can be used to set the conditions suitable for the respective materials.

In the continuous casting mold of the fifth aspect, the role of the undercoat plating layer is to protect the surface of the copper material which is prone to oxidation and becomes brittle. Then, a hard iron-based element made of Ni, Co, Fe, or an alloy having these as a base material is used as the base plating material to secure the retention of the entrainment of the spray particles. Here, the plating surface is further subjected to blasting to obtain a surface roughness of Rz = 50 to 150 μm.
However, when Rz is less than 50 μm, the adhesion is 10
This is because when it is as small as less than kg / mm ² and when Rz exceeds 150 μm, the adhesion is strong but the thickness variation of the thermal spray coating becomes large.

[0010]

Therefore, in the continuous casting mold according to the first to fifth aspects, since the thermal treatment is not performed after the thermal spraying,
Since it is possible to omit strain relief work and the like, it has become possible to reduce costs. In addition, since heat treatment is not performed, the long side having a large dimension (for example, width 1.5 to 3 in the continuous casting mold).
m) can also be constructed. Further, the wear resistance is improved, and it is possible to have a life of about 1.7 times or more as compared with the conventional casting mold for continuous casting in which the Ni—Cr alloy is sprayed. Particularly, in the continuous casting mold according to claims 1 and 4 and claim 5 subordinate thereto, since the high speed flame spraying machines are separately used for different materials at the same time, the spraying conditions can be adjusted accurately. Therefore, variations in manufacturing are reduced.
Then, it is no longer necessary to manufacture a composite material as in the prior art, and furthermore, a composite film of a self-fluxing alloy and Cr ₃ C ₂ / NiCr cermet, which was difficult by the conventional method, can be easily formed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. Here, FIG. 1 is an explanatory view showing a thermal spraying condition of the continuous casting mold according to the first embodiment of the present invention,
2 is a partial cross-sectional view of the continuous casting mold, FIG. 3 is a cross-sectional view of the continuous casting mold according to the second embodiment of the present invention, and FIG.
[Fig. 4] is a graph showing a material composition of a continuous casting mold according to a third embodiment of the present invention.

(First Embodiment) First, as shown in FIG. 1, undercoating with a thickness of about 100 μm is applied to the inner surface of a continuous casting mold body made of Cu—Cr—Zr. In this case, as the electrolytic solution, 350 g of S-Ni (nickel sulphonate) and 5 g of nickel chloride are contained in 1 liter.
A solution in which 30 g of boric acid is dissolved is used, the temperature of the plating solution is 45 to 60 ° C., and the current density is 3 A / dm ² . Although the base plating layer 14 is Ni plating in this embodiment,
For example, it may be Co, Fe, or alloy plating using these as a base material (the same applies to the following embodiments). Then, the base plating layer is subjected to blast treatment, and the surface Rz = 50 to 150 μm (preferably 70 to 100 μm).
The roughness of m) is used to improve the bonding degree of the thermal spray coating deposited thereon. In this case, for the roughening treatment, a grid of alumina having a particle size of # 20 is used, and the air pressure is set to about 3 kg / cm.
Blast processing was performed as ² . The process up to forming the roughened underlying plating layer was common to the following embodiments.

Next, as shown in FIG. 1, roughening is performed by using two high-speed flame spraying machines 10 and 11 capable of independently spraying a material A made of self-fluxing alloy and a material B made of cermet. Thermal spraying is performed on the treated base plating layer 14. In this case, as the cermet of the material B, a self-fluxing alloy, Ni
An alloy (including Ni-Cr alloy) or a Co alloy and a metal _{component, Cr 3 C 2, WC,} NbC, ZrC, or Si
C is the ceramics content. Then, the material A is supplied from the first high speed flame spraying machine 10 and the second high speed flame spraying machine 11 is used.
The material B is thermally sprayed to form the composite thermal spray coating 15 of the material A and the material B. In this case, the weight of the material B is set to 60 to 85% by weight of the total thermal spray material, and the base plating layer 14 is formed.
Also firmly adhered to the sprayed coating so that the sprayed coating had sufficient wear resistance.

When the torch angle θ of the first high speed flame spraying machine 10 and the second high speed flame spraying machine 11 is less than 45 degrees,
Since the spray particles sprayed from the high-speed flame sprayers 10 and 11 collide with each other, the formation of the spray coating 15 is poor. Therefore, it is preferable that the torch angles of the high-speed flame spraying machines 10 and 11 are close to 90 degrees. The spraying distance L ₁ of the first high speed flame spraying machine 10 is about 350 to 400 mm, and the spraying distance L ₂ of the second high speed flame spraying machine 11 is 25.
The optimum spraying distance for each is selected as 0 to 350 mm. The velocity of the spray particles in this case is about 70.
0-800m / sec (flame speed is 2500-2600m /
Seconds). This state is shown in FIG. 2, and 13 indicates a base material of the continuous casting mold.

A self-fluxing alloy (NiCrSiB) was used as the material A, NiCr 25% / Cr ₃ C ₂ 75% was used as the material B, and the thermal spraying was performed with the thermal spraying ratio of the material A and the material B being 4: 6. As a result of forming the sprayed coating 15 of about 0.9 mm (possible up to 0.1 to 1.0 mm), conventional Ni-Cr
Contrary to 1200 charges (ch) of the continuous casting mold sprayed with a system alloy, the continuous casting mold according to the first embodiment has 1700 charges, but its wear amount is 2 times that of the conventional mold.
It was / 3. The adhesion of the thermal spray coating 15 is 17 kg.
/ Mm ² . Instead of the material B, NiCr1
Although 5% / Cr ₃ C ₂ 85% was used, the wear resistance and life were the same as the above results.

(Second Embodiment) Further, in the continuous casting mold according to the second embodiment, as shown in FIG. 3, a rough surface-treated substrate is used by using the high-speed flame spraying machine 10. First, the material A is sprayed on the plating layer 14 to form the sprayed coating 1
6 was formed, and then the material B was sprayed using the high-speed flame spraying machine 11 to form the sprayed coating 17. In this case, the thickness of the thermal spray coating formed of the material A and the material B is 0.9 mm (0.1 to 0.1).
The ratio of the material A to the material B was 3: 7. In this case, the self-fluxing alloy described above is used as the material A, and Cr ₃ C is used as the material B.
_The result of using 80% NiCr20% is
It was found to have a life of 1.5 times to 2 times or more that of the i-Cr type mold.

(Third Embodiment) Further, in the continuous casting mold according to the third embodiment, as shown in FIG. 4, the material A and the material B are fed into the high-speed flame spraying machine 10,
11 was used at the same time to perform gradient blending to form a sprayed coating.
In this case, the self-fluxing alloy firmly adheres to the underlying plating layer and the surface becomes a cermet material having abrasion resistance, so the abrasion resistance is further improved, and the life of the continuous casting mold may be further extended. confirmed. Further, since the material A and the material B are sprayed by the high-speed flame spraying machines 10 and 11 which are independent of each other, the spraying conditions for each material are optimized,
Can be sprayed efficiently. Note that, although the degree of gradient mixing of each material is shown in FIG. 4, when the gradient mixing is performed linearly, the degree of internal wear increases when the surface of the thermal spray coating slightly wears. It is preferable that the amount of the material A is larger and the amount of the material B on the surface side is larger than that of the linear blend b.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a thermal spraying condition of a continuous casting mold according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the continuous casting mold.

FIG. 3 is a partial cross-sectional view of a continuous casting mold according to a second embodiment of the present invention.

FIG. 4 is a graph showing a material composition of a continuous casting mold according to a third embodiment of the present invention.

[Explanation of symbols]

10 High-speed flame spraying machine 11 High-speed flame spraying machine 13 Base material 14 Undercoating layer 15 Thermal spray coating 16 Thermal spray coating 17 Thermal spray coating

Claims (5)

[Claims] 1. A continuous casting mold in which a thermal spray coating is further formed on an underplating layer whose inner surface has been roughened, wherein the thermal spray coating is made of 15-40 wt% self-fluxing alloy. A and 60 to 85% by weight of Cr ₃ C ₂ / NiCr
Or a composite coating with WC / Co material B,
Moreover, the continuous casting mold is characterized in that the material A and the material B are simultaneously sprayed using independent high-speed flame sprayers. 2. A continuous casting mold in which a thermal spray coating is further formed on an undercoat plating layer having an inner surface roughened, wherein the thermal spray coating is a self-fluxing alloy formed on the undercoat plating layer. A continuous casting mold comprising: an adhesive material consisting of: and a wear-resistant cermet material sprayed onto the adhesive material. 3. A continuous casting mold in which a thermal spray coating is further formed on a base plating layer having an inner surface roughened, wherein the thermal spray coating is an adhesive material made of a gradient blended self-fluxing alloy. And a cermet material having wear resistance, wherein the distribution of the adhesive material is high on the side of the base plating layer, the continuous casting mold. 4. The continuous casting mold according to claim 3, wherein the adhesive material and the cermet material are simultaneously sprayed by different high-speed flame sprayers. 5. The base plating layer is made of Ni, Co, Fe or an alloy plating containing these as a base material, and the surface thereof is subjected to a roughening treatment of Rz = 50 to 150 μm. The casting mold for continuous casting according to any one of 1 to 4.