JPH052088A - First wall of fusion device - Google Patents

Abstract

PURPOSE:To provide first wall for a fusion device which never separate due to thermal load, by metallurgically contacting armortile and a base plate. CONSTITUTION:In the first wall 3 of a fusion device which contacted armortile 4 and a base plate 7 metallurgically, an edge notch part 10a is formed by cutting the base plate along the periphery of the contact surface 9 leaving a little margin on the base plate 7 side of the contact surface edge 10. Alternatively, projections and recesses are provided on the joining surface 9 between the armortile and the base plate and they are jointed metallurgically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first wall such as a diverter or a limiter of a nuclear fusion device.

[0002]

2. Description of the Related Art FIG. 7 shows a structure of a reactor body around a first wall in a nuclear fusion device. In the fusion device, against high heat load and high particle load from high temperature, high energy plasma (1),
A first wall (3) is provided on the plasma-side surface of these members for the purpose of protecting the vacuum container (2) that becomes a vacuum boundary, the blanket, the shield, and the like. Since the first wall (3) receives a high heat load from the plasma (1), it is made of a high melting point material such as tungsten, molybdenum or graphite.

FIG. 8, FIG. 9 and FIG. 10 show a conventional typical first wall structure.

(4) is an armor tile, (5) is an armor mounting bolt, (6) is an armor mounting seat, (7) is a support substrate, (8) is a cooling hole, and (9) is a metallurgical bonding surface. .
By thermally connecting the armor tile (4) and the supporting substrate (7), heat input from the plasma is removed via the cooling water in the cooling holes (8) of the supporting substrate.

FIG. 8 shows a structure in which an armor tile (4) is mechanically connected to an armor mounting seat (6) on a support substrate (7) by an armor mounting bolt (5). FIGS. FIG. 9 is a first wall of a structure in which supporting substrates are connected by metallurgical bonding.
FIG. 10 shows the case where the supporting substrate (7) is large. In the mechanical connection structure of FIG. 8, the armor tile (4) and the supporting substrate (7)
Due to the contact thermal resistance between them, the temperature of the armor tile (4) surface becomes high during the heat load from the plasma. On the other hand, in the metallurgical joining structure of FIG. 9, since the heat resistance of the joining surface is small, the heat input from the plasma is removed in a relatively short time, so the armor tile (4) does not become too hot. .

Since the amount of heat input from the plasma is large in the experimental reactor class nuclear fusion device, the metallurgical joining structure as shown in FIG. 9 occupies the majority. Generally, the high melting point material forming the armor member has a small thermal expansion coefficient, and the constituent material of the support substrate (7) for joining the armor material has a relatively large thermal expansion coefficient. Therefore, in the metallurgical joining structure, due to the difference in thermal expansion, excessive thermal stress is generated at the end portion of the joining surface during plasma heat load or joining.

[0007]

The problems of the conventional metallurgical joint first wall of FIGS. 9 and 10 are as follows. As described above, excessive thermal stress is generated in the joint surface due to the difference in thermal expansion coefficient between the armor material and the supporting substrate. At this time, the thermal stress in the vicinity of the end portion (10) of the joint portion is large, and as a result, there is a possibility that the joint surface may be damaged or the two members on the joint surface may be separated. When the peeling of both members (4) and (7) or the cracking of the end of the joint surface progresses, heat removal by heat conduction between both members becomes impossible, and the armor tile (4) becomes extremely hot, and Melting armor tiles (4),
It may be damaged. In addition, at the time of metallurgical bonding between the armor tile (4) and the supporting substrate (7), the bonding surface end (1
In 0), defects and cracks are likely to occur, and due to excessive thermal stress near the ends, cracks tend to propagate along the joint surface. As a result, there is a big problem of separation between the members (4) and (7).

According to the present invention, in the first wall of the fusion device in which the armor tile and the supporting substrate are metallurgically bonded, the bonding surface does not peel off due to the thermal stress at the time of heat load and is structurally highly reliable. The purpose is to provide a first wall of a fusion device.

[0009]

In order to achieve the above object, as a first means in the present invention, a bonding surface is formed on a first wall of a fusion device in which an armor tile and a supporting substrate are metallurgically bonded. The support substrate is cut away along the periphery of the bonding surface to leave end cutouts, leaving the support substrate side of the end slightly.

The tip of the notch may have a circular or elliptic arc-shaped cross section.

A second means of the present invention is to provide an uneven portion on the joint surface side of the armor tile and the support substrate in the first wall of the nuclear fusion device in which the armor tile and the support substrate are metallurgically joined, The uneven parts are engaged with each other and metallurgically joined.

An end gap may be provided between the armor tile and the supporting substrate along the periphery of the joint surface,
The side surface of the meshing uneven portion may be tapered.

[0013]

According to the first means, the thermal stress due to the difference in the coefficient of thermal expansion between the armor tile and the supporting substrate is concentrated on the end portion of the joint surface. This is to restrain the thermal elongation between the members by being in the joined state. After the metallurgical joining, the thermal stress concentrates on the end portion as residual stress after cooling, and is generated by the support substrate restraining the warping deformation of the end portion of the armor during thermal load. Therefore, the rigidity of the support substrate side near the joint surface is greatly reduced by forming a structure in which the lower periphery of the joint surface is largely cut out while leaving the support substrate side near the end of the joint surface slightly. With this shape, the supporting substrate does not restrain the warping deformation of the armor tile at the time of joining and heat load, so that the thermal stress and stress concentration at the end of the joining surface are greatly reduced. The effect becomes more remarkable when the support substrate is made of a material such as copper which immediately reaches a plastic region at a high temperature.

According to the second means, when the armor tile and the uneven portion of the joint surface of the support substrate are intermeshed with each other, even if a crack occurs at the joint surface end portion during joint or heat load. At the joint surface parallel to the heat flow at the meshing portion, the cracks stagnant and the armor tile does not separate.

[0015]

【Example】

(First Embodiment) A first embodiment of the first wall of the nuclear fusion device according to the present invention will be described below with reference to FIG.

The end portion (10) of the joining surface of the supporting substrate (7) is cut off along the periphery of the joining surface (9) while leaving the joining substrate (9) slightly on the supporting substrate side. The armor tile (4) and the supporting substrate (7) are metallurgically bonded to each other with the end notch (10a) having the arcuate portion (10b) at the tip.

In the first wall structure for metallurgically joining the armor tile (4) and the supporting substrate (7), the joining surface end (1
0) Supporting the joint surface end portion (10) by slightly leaving the supporting substrate (7) side and notching the tip along the periphery of the joint surface (9) into an arcuate portion (10b). The rigidity of the substrate (7) is reduced. As a result, the supporting substrate (7) does not restrain the warping deformation of the armor tile (4) at the time of joining and at the time of heat load, and the thermal stress and stress concentration at the joining surface end portion (10) are significantly reduced. .

As described above, in this embodiment,
It is possible to reduce the thermal stress at the ends of the joint surface during joining and heat load. Therefore, it is possible to prevent the occurrence of cracks at the ends of the joint surface, and thus it is possible to provide the mechanically safe first wall of the nuclear fusion device without the problems of peeling of the armor tile and the supporting substrate and dropping of the armor tile.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention.

An end in which the end portion (10) of the joint surface of the armor tile (4) and the support substrate (7) is cut out along the periphery of the joint surface with a little leaving the support substrate side, and the tip is a square portion (10c). The partial cutout portion (10a) is formed. Others are as in Example 1.

With the above arrangement, the end notch (10
In addition to the easy processing of a), the same function and effect as in Example 1 can be obtained.

(Embodiment 3) Next, a third embodiment will be described with reference to FIGS.

On the metallurgical bonding surface (9) side of the armor tile (4) and the supporting substrate (7), there are provided concavo-convex portions (11) which can be meshed with each other, and these are meshed and metallurgically bonded. The support substrate (7) is provided with cooling holes (8) apart from the bonding surface (9). The interlocking joint surface is joined by pouring a joint material between the heat flow vertical joint surface (9a) and the heat flow parallel joint surface (9b). The heat flow vertical joint surface of the joint surface end portion (10) is provided with an end gap (10d) so as to separate the periphery of the armor tile (4) and the supporting substrate (7).

The thermal stress due to the coefficient of thermal expansion between the armor tile and the supporting substrate is concentrated on the ends of the joint surface, and cracks are likely to occur at the ends. By providing an end gap (10d) between the armor tile (4) around the end (10) of the joint surface and the support substrate (7) as in the third embodiment, the armor tile (4) is warped against thermal deformation. On the other hand, since the restraint by the supporting substrate (7) is reduced, the thermal stress at the end portion (10) of the joint surface is reduced, and the possibility of crack generation at the end portion is reduced. or,
The cracks generated at the ends are joined surfaces (9
It is easy to propagate along a) and the joint surface (9
Since it is difficult to propagate along the b), the joint surface (9), (9a), (9b) is made to have the meshing structure of the concavo-convex portion (11) as in the present embodiment, so that the end crack is prevented. Progress is stagnant and does not lead to peeling of armor tiles.

As described above, in this embodiment,
Mechanically safe fusion that reduces the thermal stress at the edges of the joint surface and prevents cracks from developing even if cracks occur at the edges, without the problem of peeling between the armor tile and the support substrate. Can provide the first wall of the device.

(Embodiment 4) FIG. 6 shows a meshing portion of an uneven portion (11) at an end portion of a first wall vertical cross-section joint portion in a fourth embodiment of the present invention. This is the same as the third embodiment except that the concavo-convex portion is provided with a taper (14) to improve the bondability between the armor tile (4) and the supporting substrate (7).

Even in this case, substantially the same effect as that of the third embodiment can be obtained.

[0028]

As described above, according to the present invention, the thermal stress at the end of the joint surface can be reduced and the occurrence of cracks at the end of the joint surface can be prevented. It can provide the first wall of a non-mechanically safe fusion device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a main part of a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing a third embodiment of the present invention.

FIG. 4 is a sectional view taken along the line AA of FIG.

FIG. 5 is an enlarged view showing a joint surface end portion and an uneven portion of FIG. 3;

FIG. 6 is a vertical cross-sectional view showing a main part of a fourth embodiment of the present invention.

FIG. 7 is a schematic diagram of a reactor body around the first wall of the nuclear fusion device.

FIG. 8 is a vertical cross-sectional view showing a conventional mechanically coupled first wall.

FIG. 9 is a vertical cross-sectional view showing a metallurgically-bonded first wall when a conventional supporting substrate is small.

FIG. 10 is a vertical cross-sectional view showing a metallurgically bonded first wall in the case where a conventional supporting substrate is large.

[Explanation of symbols]

3 ... the first wall 4 ... Armor tile 7 ... Support substrate 9 ... Bonding surface 10 ... End of joint surface 10a ... Edge notch 11 ... Uneven portion

Claims (2)

[Claims] 1. A first wall of a nuclear fusion device in which an armor tile and a supporting substrate are metallurgically bonded to each other, and the supporting substrate is cut out along the periphery of the bonding surface, leaving the supporting substrate side at the end of the bonding surface slightly. A first wall of a nuclear fusion device, characterized in that an end cutout is formed. 2. A first wall of a fusion device in which an armor tile and a supporting substrate are metallurgically bonded, a concavo-convex portion is provided on a joint surface side of the armor tile and the supporting substrate, and the concavo-convex portion is meshed with each other to perform metallurgy. The first wall of the nuclear fusion device, which is characterized in that they are joined together mechanically.