JP2003206184A - Jointed body, high-pressure discharge lamp and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jointed structure and a joining method for joining a ceramic member or a cermet member strongly with a metal member such as a molybdenum member and obtaining a joined part having high gastightness and a high corrosion resistance and being prevented from fracture even when heat cycles are applied to the joined part. <P>SOLUTION: A joining body has the joining part 6 which is interposed between a first member of a metal and a second member 4 of the ceramic or cermet and joints the first member and the second member 4. The joining part 6 has a main layer 14 which is in contact with the metal member and an interface glass layer 13 which is present at the interface between the second member 4 and the main layer 14. The main layer 14 is formed from a sintered compact of a metal powder and composed of a porous skeleton 15 having open pores and an impregnated glass phase 10 impregnated into the open pores of the porous skeleton. It is preferable that the interface glass layer 13 and the impregnated glass phase 10 are formed from glass having substantially an identical composition. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined body of a metal member and a ceramic member and a method for manufacturing the same, and more particularly to a high pressure discharge lamp using a ceramic discharge tube.

[0002]

2. Description of the Related Art In a high-pressure discharge lamp, a plugging material (usually called a ceramic plug) is inserted inside both ends of a ceramic discharge tube to plug each end, and each plugging material is plugged. A through hole is provided in the through hole, and a metal member having a predetermined electrode system fixed thereto is inserted into the through hole. An ionized luminescent material is enclosed in the internal space of the ceramic discharge tube.
As such a high-pressure discharge lamp, a high-pressure sodium light emitting lamp and a metal halide lamp are known, and in particular, the metal halide lamp has a good color rendering property. By using ceramic as the material of the discharge tube,
It has become possible to use it at high temperatures.

In such a discharge lamp, it is necessary to hermetically seal between the end of the ceramic discharge tube and the electrode device holding material. The body of the ceramic discharge tube is tubular or barrel-shaped with both ends being narrowed, or is straight tubular. The ceramic discharge tube is made of, for example, an alumina sintered body. As a method of sealing the end portion of the ceramic discharge tube, for example, Japanese Patent Laid-Open No. 6-318435 discloses the following structure. A blocking member is inserted and held inside the end of the ceramic discharge tube. A through hole is formed so as to extend in the axial direction of the occluding material, and the elongated electrode device holding material is inserted and fixed in the through hole. Here, the plugging material is formed by cermet containing both alumina and the constituent metals of the electrode device holding material in a fixed ratio, and the coefficient of thermal expansion of the plugging material is the same as that of the electrode device holding material and the ceramic discharge. It should be located between the coefficient of thermal expansion of the tube.

When forming this sealing structure, when the ceramic discharge tube is fired without inserting the calcination body of the plugging material into the calcination body of the ceramic discharge tube, the inner diameter of the end is blocked. It is designed to be smaller than the outer diameter of the material. Therefore, the plug is firmly clamped and held in the end of the ceramic discharge tube. The same applies to the blocking material and the electrode device holding material.

Further, Japanese Patent Laid-Open No. 7-176296 discloses a method for sealing a metal vapor arc tube. According to this, after fixing the platinum pipe to the opening of the arc tube,
Insert a platinum cap equipped with a tungsten electrode into a platinum pipe, set a low melting point metal braze between the platinum pipe and the platinum cap, and heat the low melting point metal braze part by high frequency waves, etc. And the platinum cap is sealed. Alternatively, a niobium cap is inserted into the opening of the arc tube, and this cap is sealed with a low melting metal braze.

[0006]

However, the present inventor
As a result of further study on the above-mentioned sealing structure,
I found the following problems. In other words, in this sealing structure, the pressure between the blocking material and the electrode device holding material seals the two, but the lighting-off cycle is repeated many times, so that the thermal expansion of both In view of the difference in the coefficient, it is necessary to further improve the reliability of this sealed portion. In particular, since metal halides have high corrosion resistance, it is necessary to develop a seal structure having high corrosion resistance and reliability.

That is, for example, a ceramic discharge tube or a clogging material made of alumina and a metal member made of molybdenum can be firmly joined, and the airtightness and corrosion resistance of the joined portion are high, and the light-off-lighting cycle (thermal cycle It is necessary to have a joint structure that does not damage the joint part when () is added. Further, as the occluding material, one made of so-called cermet is also known, but in this case, the above-mentioned characteristics are required for the joint structure of the occluding material and the metal member.

Also, in the sealing method described in Japanese Patent Laid-Open No. 7-176296, a platinum pipe and an arc tube (ceramic tube) are joined and sealed with glass solder. Therefore, at the interface between the platinum pipe and the glass solder, there is no chemical bonding between the surface of platinum and the glass, and the mechanical soldering force is only applied to the platinum pipe from the glass solder. In addition, if a crack occurs in the glass solder, the crack easily propagates in the glass solder.

An object of the present invention is to firmly bond a ceramic member or a cermet member to a metal member such as molybdenum, and the bonded portion has high airtightness and corrosion resistance, and is bonded even when a thermal cycle is applied. It is an object of the present invention to provide a joining structure and a joining method in which parts are not damaged.

Another object of the present invention is to apply such a joining structure to a high-pressure discharge lamp, which has high durability against corrosive gases such as metal halides, high airtightness, and a lighting-off cycle. It is to prevent the joint part from being damaged even when

[0011]

The present invention is a joined body of a first member made of metal and a second member made of ceramics or cermet, which comprises a first member and a second member. It is provided with a joining portion for joining the first member and the second member interposed therebetween, and this joining portion is in contact with the main phase that contacts the first member, and the second member, and the second member. Equipped with an interface glass layer present at the interface between the member and the main phase,
It is characterized in that the main phase is made of a sintered body of metal powder, and has a porous skeleton having open pores, and an impregnated glass phase impregnated into the open pores of the porous skeleton.

The present invention also provides a ceramic discharge tube having an internal space filled with an ionized luminescent material and a starting gas, the ceramic discharge tube having an opening at an end thereof, and the ceramic discharge tube provided in the internal space. A high-pressure discharge lamp comprising: an electrode device, a plugging member at least partially fixed to an opening of a ceramic discharge tube, the plugging member having a through hole, and a metal member. The metal member and the occluding member constitute an airtight joined body, the joined body is made of the joined body, and the metal member is the first member and the occluding member is the second member. Characterize.

The present invention also provides a ceramic discharge tube having an internal space filled with an ionized luminescent material and a starting gas, the ceramic discharge tube having an opening at its end, and the ceramic discharge tube provided in the internal space. An electrode device which is, and a high-pressure discharge lamp comprising a metal member, the metal member and the ceramic discharge tube constitutes an airtight joined body, the joined body, the joined body, The metal member is the first member, and the ceramic discharge tube is the second member.

The present invention is also a method for producing a joined body of a first member made of metal and a second member made of ceramics or cermet, wherein the first member and the second member are joined together. In addition, a porous skeleton composed of a sintered body of metal powder and having open pores is arranged, and glass melted at a temperature lower than the melting point of the metal constituting the porous skeleton is impregnated into the open pores of the porous skeleton. By doing so, a main phase composed of a porous skeleton and an impregnated glass phase impregnated into the open pores is generated, and at this time, the molten glass is caused to flow into the interface between the second member and the main phase to form an interfacial glass layer. Is generated, thereby joining the first member and the second member.

1 (a) and 1 (b) -FIG. 8 are sectional views showing an example in which the present invention is applied to the end portion of a high pressure discharge lamp.

Inner wall surface 1 of the end 1a of the ceramic discharge tube 1.
When viewed in the direction of the central axis of the ceramic discharge tube, b extends straight. A part of the occluding material 4 is inserted inside the opening 40 of the end portion 1a. 4 c is an outer side surface of the occluding member 4, and 46 is a through hole of the occluding member 4.

A concave portion or a step portion 9 is provided on the inner wall surface 4a side of the closing member 4. The metal member 7 is housed in the step portion 9. In this example, the metal member 7 has a tubular shape, and an opening for enclosing the starting gas and the ionized luminescent material and then sealing is provided on the end 7d side. 7b is an inner side surface of the metal member 7, and 7c is an outer side surface thereof. The inner space of the metal member 7 communicates with the inner space of the ceramic discharge tube 1 (described later). The blocking member 4 is provided with a protruding portion 42, and the protruding portion 42 serves as the metal member 7.
Facing the end portion 7a.

As shown in FIG. 1 (a), the present inventor locates the porous skeleton 2 made of a sintered body of metal powder and having open pores between the metal member 7 and the closing member 4. It was Then, a glass material (not shown) was placed on the porous skeleton 2. At this time, the melting point of the porous skeleton 2 was set to be higher than the melting point of the glass material.

When the glass material is melted, the molten glass is impregnated into the open pores of the porous skeleton and impregnated into the porous skeleton and the open pores, as schematically shown in FIG. 1 (b). It was found to produce a main phase 14 consisting of an impregnated glass phase. Further, it was found that the molten glass slightly floats the porous skeleton from the surface of the occluding material 4, flows into the interface between the occluding material 4 and the main phase 14, and forms the interface glass layer 13. The main phase 14 and the interface glass layer 13 form a joint 6 that joins the metal member 7 and the occluding member 4. Reference numeral 41 is a joint surface of the blocking member 4. The joint 6 extends to the vicinity of the protrusion 42, and the protrusion 42 and the metal member 7
A bonding glass layer 48 was formed between the end glass 7 and the end 7a.

Such a structure will be described with reference to the scanning electron micrographs of FIGS. 2, 3, 4 and 5 and the explanatory views of FIGS. 6 and 7. 3 is an enlarged photograph of FIG. 2, and FIG. 6 is an explanatory diagram corresponding to the photograph of FIG. An interface glass layer 13 and a main phase 14 are formed on the surface of the blocking member 4. The main phase 14 is a porous skeleton 15 and a porous skeleton 1
5 of the impregnated glass phase 10 impregnated into the open pores. The interface glass layer 13 has the same composition as that of the impregnated glass phase 10, but in this example, the crystal phase 11 and the non-crystallized phase 12 were separated from each other, and the crystallized glass was formed. This is because only the crystallizable component in the glass material was precipitated in the glass as crystals. 5 is an enlarged photograph of FIG. 4, and FIG. 7 is an explanatory diagram corresponding to the photograph of FIG. On the surface of the metal member 7, the main layer 1 of the joining region 6
4 was generated.

According to the bonded body having the above structure, the tensile strength applied to the glass is dispersed by the metal particles (porous skeleton), and the compressive strength applied to the porous skeleton is dispersed by the glass in the open pores. That is, it is possible to cope with both the tensile stress and the compressive stress applied to the joining region by the cooperation of different kinds of materials. Further, although cracks are likely to occur in the glass alone, even if cracks propagate in the glass phase, the propagation of the cracks is blocked by the metal porous skeleton, so that breakage of the bonding region can be prevented. Moreover, the main phase composed of the porous skeleton and the impregnated glass phase adheres to the metal member, and the interface glass layer adheres firmly to the occluding material.

Further, a glass component susceptible to corrosion is impregnated mainly in the open pores of the porous skeleton.

Furthermore, since the main phase can act as a thermal expansion relaxation layer between the metal member and the occluding material, it is strong against thermal cycles. That is, as shown in the schematic view of FIG. 8, for example, when the thermal expansion coefficient of the plug 4 is larger than that of the metal member 7, the thermal expansion coefficient of the main phase 14 is Since it is a porous body, it can generally be close to the thermal expansion coefficient of the metal member 7. The coefficient of thermal expansion of the interface glass layer 13 can generally be close to that of the occluding material 4.

As described above, in the structure of the present invention, not only the mechanical pressure bonding force but also the above-mentioned physical and chemical bonding are generated between the metal member and the glass, so that the airtightness is improved. Is high and cracks are unlikely to propagate.

Such a joint is particularly suitable for a high pressure discharge lamp. In this case, the high-pressure discharge lamp is extremely stable with respect to the lighting-extinguishing cycle and is also stable with respect to the corrosive gas in the internal space of the ceramic discharge tube.

In this embodiment, preferably, the occluding material and the metal member are joined together. In addition, when not providing the blocking material,
The ceramic discharge tube and the metal member are joined together.

When the metal member and the discharge tube were directly joined by the joining structure and method of the present invention, it was extremely effective for miniaturization of the high pressure discharge lamp. That is, the widthwise dimension of the high pressure discharge lamp is limited by the dimension of the end portion. However, it is difficult to reduce the widthwise dimension of the ceramic discharge tube to a certain extent or more by inserting the blocker inside the end of the ceramic discharge tube. It was difficult to make it smaller. As a result, specifically, the output is 2
When the level was suppressed to 5 W or less, the luminous efficiency of the space inside the ceramic discharge tube became extremely low. When the metal member and the discharge tube are directly joined, the high-pressure discharge lamp can be downsized, so that a high-pressure discharge lamp with a low output of 25 W or less can be provided as a product, which is epoch-making. Is.

In the present invention, preferably, the interface glass layer and the impregnated glass phase have substantially the same composition. This means that they belong to the same component system as a whole, which improves the strength of the joint. It is further preferred that the composition of the interfacial glass layer and the impregnated glass phase be substantially the same. This means that the interface glass layer and the impregnated glass phase originate from the same glass material. In the interface glass layer and the impregnated glass layer, a part of the glass may be crystallized, and in this case, the bonding strength to the ceramic member is further improved. Crystallinity is 10% -5
0% is preferable.

When the present invention is applied to a high pressure discharge lamp,
The metal member may be an electrode device holding material to which the electrode device is directly attached, or may be a tubular member for inserting the electrode device holding material to which the electrode device is directly attached, and there is no particular limitation. . An example of the latter is JP-A-6-
The technique described in Japanese Patent No. 318435 can be exemplified.

The material of the metal member is preferably one or more metals selected from the group consisting of molybdenum, tungsten, rhenium, niobium, tantalum and alloys thereof, or alloys thereof.

Of these, the coefficient of thermal expansion of niobium and tantalum is almost in balance with the coefficient of thermal expansion of the ceramics, particularly alumina ceramics, which constitutes the ceramic discharge tube, but it is known that niobium and tantalum are easily corroded by metal halides. There is. Therefore, in order to prolong the life of the metal member, it is preferable to form the metal member with a metal selected from the group consisting of molybdenum, tungsten, rhenium and alloys thereof. However, metals having high corrosion resistance to these metal halides generally have a small coefficient of thermal expansion. For example, the coefficient of thermal expansion of alumina ceramics is 8 × 10 ^-6 K ^-1 , the coefficient of thermal expansion of molybdenum is 6 × 10 ^-6 K ^-1 , and the coefficient of thermal expansion of tungsten and rhenium is 6 × 10 ^-6. It is K ^-1 or less. As described above, the joining structure of the present invention also has an action of alleviating the difference in thermal expansion between the metal member and the ceramic discharge tube or the blocking member in this case as well.

Molybdenum is advantageous for the structure of the present invention in that it has a high corrosion resistance to metal vapor, particularly metal halide gas, and a high wettability to glass.

When molybdenum is used as the material of the metal member, molybdenum contains at least one of La ₂ O ₃ and CeO ₂ in a total amount of 0.1 wt% to 2.0 wt%. Is particularly preferred.

The porous skeleton is composed of a sintered body of metal powder. As a material of the metal powder, a metal selected from the group consisting of molybdenum, tungsten, rhenium, niobium, tantalum and alloys thereof is preferable. Particularly, in order to further improve the corrosion resistance against halogen of the metallized layer, a metal selected from the group consisting of molybdenum, tungsten, rhenium and alloys thereof is particularly preferable.

The main component of the metal forming the metal member and the main component of the metal forming the porous skeleton are preferably the same, and molybdenum is more preferable. Here, the main component of a metal is 60% by weight of this metal.
It means that it occupies the above.

The open porosity of the porous skeleton is preferably 30% or more, more preferably 40% or more, whereby the strength of the joining region can be further increased. The open porosity is preferably 80% or less, and more preferably 70% or less, whereby glass is appropriately impregnated into the open pores of the porous skeleton,
The stress applied to the porous skeleton can be dispersed, and the durability against heat cycle can be improved.

In order to appropriately generate the impregnated glass phase according to the present invention, it is preferable that the tap density of the metal powder as the raw material of the porous skeleton be 2.5 to 3.5 g / cc.

The second member or occluding member is made of ceramics or cermet. This ceramic is preferably one or more ceramics selected from the group consisting of alumina, magnesia, yttria, lanthanum and zirconia, or a mixture thereof.

More specifically, as the material of the occluding material,
The same material as the ceramic discharge tube can be used, or different materials can be used. When the current conductor is made of niobium or tantalum, it is preferable that the ceramic discharge tube and the blocking member are made of the same ceramic material. This is because in this case, the thermal expansion coefficients of the current conductor, the ceramic discharge tube, and the plug can be approximated. However, the same kind of material here means that the base ceramics are common, and the added components may be different.

On the other hand, when molybdenum, tungsten, rhenium or an alloy thereof is used as the material of the metal member, the difference in thermal expansion between the ceramic discharge tube and the metal member becomes relatively large, so the material of the plugging material. It is preferable that the coefficient of thermal expansion is between the coefficient of thermal expansion of the current conductor and the coefficient of thermal expansion of the material of the end portion of the ceramic discharge tube. For this purpose, the occluding material may be formed by cermet.

Cermet is a composite material of ceramics and metal. As this ceramic, alumina,
One or more ceramics selected from the group consisting of magnesia, yttria, lanthanum and zirconia are preferably used alone or a mixture thereof, and particularly, the same ceramic as the material of the ceramic discharge tube is preferable. This makes it possible to simultaneously fire the ceramic discharge tube and the plugging material. From this viewpoint, it is more preferable that the ceramic discharge tube and the ceramic component of the cermet are both alumina ceramics.

The metal component of the cermet is tungsten,
It is preferable to select from refractory metals having corrosion resistance to metal halides such as molybdenum and rhenium, or alloys thereof. This makes it possible to impart high corrosion resistance to metal halides to the occluding material. In the cermet, the ratio of the ceramics component is preferably 55% by weight or more, more preferably 60% by weight or more (the ratio of the metal component is the balance).

The glass constituting the interface glass layer and / or the impregnated glass layer is Al ₂ O ₃ , SiO ₂ , Y ₂ O.
It is preferably composed of a material selected from the group consisting of ₃ , Dy ₂ O ₃ , B ₂ O ₃ and MoO ₃ , and particularly preferably contains Al ₂ O ₃ and SiO ₂ . Further, from the viewpoint of wettability, it is preferable to contain the main component of ceramics or cermet forming the second member. Here, the main component means a ceramic component occupying 70% by weight or more of ceramics, or a ceramic component occupying 60% by weight or more of cermet.

The preferred composition range is as follows. Al ₂ O _3: 10-30 wt% SiO _2: 15-40 wt% Y ₂ O _3: 0-40 wt% Dy ₂ O _3: 0-70 wt% B ₂ O _3: 0-5 wt% MoO ₃ : 0-10% by weight

The joining method as described above can be adopted at both ends of the ceramic discharge tube, but at one of these ends, it is necessary to inject the ionized luminescent material through the inside of the metal member. The metal member needs to be tubular. At the other end, a metal member having various shapes such as a rod shape and a tubular shape can be adopted.

The shape of the ceramic discharge tube is generally
It may be tubular, cylindrical, barrel-shaped, etc., and is not particularly limited. When the metal member is a tubular electrode member holding device, and the ionized luminescent material is sealed inside the discharge tube through the electrode device holding material, the electrode device holding material is closed by laser welding or TIG welding after this sealing. Let At the time of laser welding, for example, an Nd / YAG laser is used.

In the case of a metal halide high pressure discharge lamp, an inert gas such as argon and a metal halide are enclosed in the internal space of the ceramic discharge tube, and further mercury is enclosed if necessary.

FIG. 1, FIG. 9 and FIG. 10 show the shape of the end of a high pressure discharge lamp to which the present invention can be applied. However,
Description of the components shown in FIGS. 1 and 8 is omitted.

A step portion 9 is provided between the blocking member 4 and the metal member 7.
The joint portion 6 of the present invention is present inside the joint portion 6,
The two are joined by and the airtightness is maintained.

As shown in FIG. 9, the shaft 27 of the electrode device 18 is
Is attached to a sealing member (preferably made of metal) 19, the electrode device 18 is housed in the internal space of the ceramic discharge tube, and the sealing member 19 is inserted inside the metal member 7. As shown in FIG. 10, the end portion 19a of the sealing member 19 is different from the metal member 7.
Are joined by the above-mentioned welding or the like to form the sealing portion 21. As a result, the ionized luminescent material and the starting gas in the internal space of the ceramic discharge tube are sealed so as not to come into contact with the outside air, and the sealing member 19 is attached to the electrode device 18.
Power can be supplied via. The protrusion 42 is
It has a function of positioning the metal member 7 and a function of lengthening the outflow path of the corrosive gas.

FIG. 11 is a schematic view showing an example of a high pressure discharge device. The same reference numerals are given to the components shown in FIGS. 1, 9 and 10, and the description thereof will be omitted.

The high-pressure discharge device 23 is generally provided with an outer tube 30 made of hard glass, and the high-pressure discharge lamp 1 is housed in the outer tube 30. Both ends of the outer tube 30 are closed by the ceramic bases 22. A sealing member 19 is housed and joined in each metal member 7. The external lead wire 25 is connected to the outer end portion 19 a of the sealing member 19.

In the embodiment of FIG. 12, no protrusion is provided on the inner wall surface side of the blocking member 4. Then, the metal member 7 and the occluding member 4 are provided over substantially the entire length of the through hole 46 of the occluding member 4.
Is joined to the inner wall surface 4a. In addition, 6A is a joining part, 13A is an interface glass layer, and 14A is a main phase.

In the embodiment of FIG. 13, the inner wall surface 1b of the end portion 1a of the ceramic discharge tube 1 extends straight when viewed in the direction of the central axis of the ceramic discharge tube. End 1
A stepped portion 31 is provided on the end 1d side of the inner wall surface 1b of a. The end portion 7 a of the metal member 7 is housed in the step portion 31. Between the discharge tube 1 and the metal member 7, there is a joint 6B in the step portion 31, and the joint 6
Both are joined by B and airtightness is maintained. 32 is a metallization layer.

FIG. 14 is an enlarged view of the vicinity of the step portion 31 in FIG. The bonding portion 6B includes a main phase 14B that contacts the metal member 7 and an interface glass layer 13B that contacts the discharge tube 1. The metallized layer 32 covers the inner wall surface 1b of the end portion 1a of the discharge tube 1, and further covers the surface of the step portion 31,
It contacts the edge surface of the end 7a of the metal member 7 and joins the joint 6B.
Extends to the edge of the.

In the embodiment shown in FIG. 15, no protrusion is provided on the inner wall surface 1b side of the end portion 1a of the discharge tube 1, and the inner wall surface 1b extends substantially straight. The metal member 7 and the inner wall surface 1 of the end 1a are provided over substantially the entire length of the opening 40 of the end 1a.
It is joined with b. 6C is a joint part, 13C is an interface glass layer, and 14C is a main phase.

In each of the embodiments described above, the joint portion of the present invention is formed between the outer peripheral surface of the metal member and the inner wall surface of the end portion of the ceramic discharge tube or the inner wall surface of the blocker. . In other words, the joint of the present invention does not block the opening at the end of the ceramic discharge tube or the through hole of the blocker. However, since the joint portion of the present invention has high corrosion resistance, the interface glass layer is brought into contact with the inner wall surface facing the opening of the ceramic discharge tube, and the opening is formed by the interface glass layer and the main phase. Can be airtightly closed. Alternatively, the interfacial glass layer can be brought into contact with the inner wall surface of the occluding member facing the through hole, and the through hole can be airtightly closed by the interfacial glass layer and the main phase. In these cases, the metal member is joined to the main phase without penetrating the joint. 16 and 17 relate to these embodiments.

In the embodiment of FIG. 16, the inner surface 38b of the ceramic discharge tube 38 of the high pressure discharge lamp on the side of the end surface 38c.
The first occluding member 37 is inserted in. The outer peripheral surface 38a of the discharge tube 38 extends in a substantially straight line when viewed in the longitudinal direction, and the thickness of the discharge tube 38 is substantially constant. A second cylindrical occlusion material 39 is inserted inside the first occlusion material 37. Both the blocking members 37 and 39 are made of ceramics or cermet, like the blocking members described above. Inside the second closing member 39, the joint portion 6D of the present invention is formed.

When forming the joint portion 6D, first, the porous skeleton is inserted inside the occluding member 39. The metal member 35 preferably made of molybdenum and the metal shaft 27 are previously joined to the porous skeleton. At this time, if the dimensions of the outer peripheral surface of the porous skeleton and the inner wall surface 39a of the occluding member 39 are made completely the same, the porous skeleton cannot be inserted when a dimensional error occurs. Provide a clearance of 10 mm. When the porous skeleton is inserted and the glass material is melted on the porous skeleton, the glass is impregnated in the portion of the porous skeleton and the main phase 14D is generated, and in the gap between the porous skeleton and the blocking member 39. The interface glass layer 13D is generated.

As a result, the through-hole 46 of the occluding member 39 is almost occluded by the main phase 14D, and the main phase 14D and the occluding member 3 are closed.
An interface glass layer 13D is generated in a gap between the inner wall surface 39a of the inner surface 9 and the inner wall surface 39a. The metal shaft 27 is joined to the surface of the main phase 14D on the inner space 17 side, and the metal member 35 is joined to the outer surface of the main phase 14D. A glass layer 45 is further formed in the gap between the metal member 35 and the blocking member 39.

In the embodiment of FIG. 17 as well, similar to FIG. 16, the joint portion 6E of the present invention is formed in the opening 40 of the end portion 1a of the discharge tube 1.

When forming the joint 6E, first, a porous skeleton is inserted into the inner opening 40 of the end 1a of the discharge tube 1. The metal member 35 and the metal shaft 27 are previously joined to the porous skeleton. At this time, preferably between the outer wall surface of the porous skeleton and the inner wall surface 1b of the discharge tube 1 is preferably 0.05-
Provide a clearance of 0.10 mm. When the porous skeleton is inserted and the glass material is melted on the porous skeleton, the porous skeleton is impregnated with glass to generate the main phase 14E, and in the gap between the main phase 14E and the discharge tube 1. Interface glass layer 1
3E is generated.

Next, the most preferable process for manufacturing the high pressure discharge lamp according to each aspect of the present invention will be described. When the occluding material is used, the occluding material powder (preferably alumina powder) is molded to obtain a ring-shaped occlusive molding. At this stage, it is preferable to press-mold the powder granulated with a spray dryer or the like at a pressure of 2000 to 3000 kgf / cm ² . The obtained molded body is preferably degreased and calcined to obtain a calcined body, which has a dew point of -15 to
In a reducing atmosphere of 15 ° C., main firing is performed at a temperature of 1600 to 1900 ° C. to obtain a plugging material.

At this time, the degreasing treatment is preferably carried out by heating at a temperature of 600 to 800 ° C., and the calcination treatment is preferably carried out at a temperature of 1200 to 1400 ° C. in a hydrogen reducing atmosphere. By this calcination treatment, a certain degree of strength is given to the molded body of the occluding material, the paste leveling failure due to the suction of the solvent when the metallizing material is brought into contact with the occluding material is prevented, and the operability of the occluding material is improved. be able to. The recess can be formed by, for example, machining.

On the other hand, a metal powder is prepared, crushed, dried, a binder such as ethyl cellulose or acrylic resin is added and kneaded to obtain a paste, and the paste is applied to the outer peripheral surface of the end of the metal member. Dry at 20 ° C-60 ° C. This calcined body is heated to 1200 to 17 in a reducing atmosphere with a dew point of 20 to 50 ° C., an inert gas atmosphere or under vacuum.
Bake at a temperature of 00 ° C.

On the other hand, by molding the body of the ceramic discharge tube,
The molded body is degreased and calcined to obtain a calcined body of a ceramic discharge tube. A pre-fired body of the occluding material is inserted into the end surface of the obtained calcined body, set at a predetermined position, and main-fired at a temperature of 1600 to 1900 ° C in a reducing atmosphere having a dew point of -15 to 15 ° C. , Get a ceramic discharge tube.

On the other hand, the powder or frit prepared to have a predetermined glass composition is crushed, a binder such as polyvinyl alcohol is added, granulated, and press-molded,
A glass material is obtained by degreasing. Alternatively, a powder or frit for glass is melted, solidified, a solidified product is crushed, a binder is added, granulated, press-molded, and degreased. At this time, it is preferable to add 3-5% by weight of binder to the glass, press-mold at a pressure of 1-5 tons, degreasing is performed at about 700 ° C., and calcination is 1000-
It is performed at about 1200 ° C. Assemble the discharge tube, the blocker, the metal member, the porous skeleton, and the glass material as shown in FIG.
Heat to 1000-1600 ° C. in a non-oxidizing atmosphere.

According to the above manufacturing process, the ceramic discharge tube described with reference to FIGS. 1 to 8 was manufactured.
However, the ceramic discharge tube and the blocking material were formed of alumina porcelain, and a molybdenum pipe was used as the metal member. Further, molybdenum powder having an average particle size of 3 μm was used, and ethyl cellulose was used as a binder. The tap density of the molybdenum powder was 2.9 g / cc. The glass composition was 60% by weight dysprosium oxide, 15% by weight alumina, and 25% by weight silica.

A thermal cycle test was conducted on this ceramic discharge tube. Specifically, the temperature was kept at room temperature for 15 minutes, then the temperature was raised to 950 ° C., the temperature was kept at 950 ° C. for 5 minutes, and then the temperature was lowered to room temperature. . Thereafter, was measured the presence of a leak by a helium leak test, leak amount ^{10 - 1 0 atm · cc ·} se
It was less than c. It should be noted that 850 ° C. is a normal use temperature and 950 ° C. is an overload temperature. The durability against this means that even when the starting gas and the ionized luminescent material are press-fitted into the discharge tube at a higher pressure than usual, they can be safely held for a long period of time.

Note that FIG. 2 is a scanning electron microscope photograph showing the vicinity of the interface between the inner surface of the occluding member 4 and the joint region at this time, and FIG. 3 is an enlarged photograph of a part of FIG. Yes, FIG. 6 is an explanatory diagram of FIG. 3. FIG. 4 is a scanning electron microscope photograph showing the vicinity of the interface between the surface of the metal member 7 and the bonding region, FIG. 5 is an enlarged photograph of a part of FIG. 4, and FIG. FIG.

When the plugging material is not used in the high pressure discharge lamp, the main body of the ceramic discharge tube is molded, the molded body is degreased, calcined, and then main-fired. Meanwhile, a paste of metal powder is manufactured as described above, the paste is applied to the surface of the metal member, printed, and heat-treated to generate a porous skeleton.
A high pressure discharge lamp is obtained by assembling a discharge tube and a metal member, setting the above-mentioned glass material, and heat-treating as described above.

The joined body and joining method of the present invention are applicable to all 900 °, such as a switch such as a vacuum switch, in addition to the high pressure discharge lamp.
It can be widely applied as a part of a structure having a conductive portion or a terminal which requires airtightness at a high temperature.

[0073]

As described above, according to the present invention, the first member made of metal such as molybdenum can be firmly joined to the second member made of ceramics or cermet, and the airtightness of the joined portion can be improved. It is possible to provide a joining structure and a joining method that have high corrosion resistance and do not damage the joining portion even when a thermal cycle is applied.

[Brief description of drawings]

FIG. 1A is a cross-sectional view schematically showing a state in which a porous skeleton 2 is installed between a blocking member 4 and a metal member 7 in the joining method of the present invention, and FIG. It is sectional drawing which shows typically the joined body after the glass material is melted.

FIG. 2 is a scanning electron micrograph showing the vicinity of the interface between the inner surface of the occluding member 4 and the joint in the example of the present invention.

FIG. 3 is a scanning electron micrograph showing a part of FIG. 2 in an enlarged manner.

FIG. 4 is a scanning electron micrograph showing the vicinity of the interface between the surface of the metal member 7 and the joint in the example of the present invention.

FIG. 5 is an enlarged photograph showing a part of FIG.

FIG. 6 is an explanatory view of the photograph of FIG.

FIG. 7 is an explanatory diagram of the photograph of FIG.

FIG. 8 is a schematic diagram showing the relationship between the laminated structure of the joint and the thermal expansion coefficient of each layer in the joint body of FIG. 1 (b).

FIG. 9 shows a sealing member 1 in a metal member 7 of the high pressure discharge lamp of FIG.
It is sectional drawing which shows the state which inserted 9.

FIG. 10 is a cross-sectional view showing the high pressure discharge lamp after the metal member 7 and the sealing member 19 of FIG. 9 are joined to form the sealing portion 21.

FIG. 11 is a schematic view showing an example of a high pressure discharge lamp.

FIG. 12 is a cross-sectional view schematically showing a form of an end portion of a high-pressure discharge lamp according to another embodiment of the present invention, in which a metal member 7 is joined over substantially the entire length of the inner wall surface of the closing member 4.

FIG. 13 is a cross-sectional view schematically showing a form of an end portion of a high-pressure discharge lamp according to still another embodiment of the present invention, in which an end portion 1a of a discharge tube 1 and a metal member 7 are joined together, In addition, the metal member 7 and the metal shaft 27 of the electrode device 18 are electrically connected by the metallized layer 32 that covers the surface of the end portion 1a.

14 is an enlarged cross-sectional view showing the vicinity of the step portion 31 of FIG.

FIG. 15 is a cross-sectional view schematically showing a form of an end portion of a high-pressure discharge lamp according to still another embodiment of the present invention, in which the metal member 7 is provided over substantially the entire length of the inner wall surface of the end portion 1a of the discharge tube 1. It is joined.

FIG. 16 is a cross-sectional view schematically showing a form of an end portion of a high pressure discharge lamp according to still another embodiment of the present invention, in which a closing member 39 is provided.
The through hole 46 is closed by the joint portion 6D of the present invention.

FIG. 17 is a sectional view schematically showing a form of an end portion of a high-pressure discharge lamp according to still another embodiment of the present invention, in which the opening 40 of the end portion 1a of the discharge tube 1 is formed by the joint portion 6E of the present invention. It has been blocked.

[Explanation of symbols]

1 Ceramic discharge tube 1a Opening part
2,15 Porous skeleton 4,37,39 Closing material
4a, 39a Inner wall surface 4b of the occluding material
End surface 4c of the closing member 4c Outer peripheral surface 6 of the closing member 4,
6A, 6B, 6C, 6D, 6E Joint part 7
Metal member (current conductor) 9, 31 Step portion 10 Impregnated glass phase
11 Crystallized part in interface glass layer 12 Non-crystallized part of interface glass layer 13, 13A, 13
B, 13C, 13D, 13E Interface glass layer 14, 14A, 14B, 14C, 14D, 14E Main phase 17 Internal space of the ceramic discharge tube 1
18 Electrode Device 32 Metallized Layer 40 Opening of Ceramic Discharge Tube 41 Bonding Surface 42 Projection 46 Through Hole of Closing Material 48 Bonding Glass Layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01J 61/36 H01J 61/36 BF term (reference) 4G026 BA02 BA03 BA05 BB21 BB31 BF02 BF04 BF31 BF45 BF52 BG02 BG10 BG23 BG28 BH06 4K018 AA19 AA21 AA40 AB06 AD09 CA08 CA11 DA32 DA33 FA42 KA32 5C012 JJ01 JJ02 5C043 DD15

Claims (16)

[Claims] 1. A joined body of a first member made of metal and a second member made of ceramics or cermet, which is interposed between the first member and the second member. It is provided with a joining portion for joining the first member and the second member,
This joint portion comprises a main phase in contact with the first member, and an interface glass layer in contact with the second member and present at the interface between the second member and the main phase, and the main phase Is a sintered body of metal powder, and comprises a porous skeleton having open pores and an impregnated glass phase impregnated in the open pores of the porous skeleton. 2. The main component of ceramics or cermet forming the second member is contained in the interface glass layer and the impregnated glass phase,
The joined body according to claim 1. 3. The metal member and the ceramic member according to claim 1, wherein the metal forming the porous skeleton contains a main component of the metal forming the first member. And a joint. 4. The bonded body according to claim 1, wherein the interface glass layer and the impregnated glass phase are made of glass of the same component system. 5. The open porosity of the porous skeleton is 30% or more,
80% or less, The joined body as described in any one of Claims 1-4 characterized by the above-mentioned. 6. A ceramic discharge tube having an internal space filled with an ionized luminescent material and a starting gas, the ceramic discharge tube having an opening at its end, and an electrode provided in the internal space. A high-pressure discharge lamp comprising: a device, a closing member at least a part of which is fixed to the opening of the ceramic discharge tube, the closing member having a through hole, and a metal member, The metal member and the occluding member constitute an airtight bonded body, the bonded body is the bonded body according to any one of claims 1 to 5, and the metal member is the A high pressure discharge lamp, which is a first member, wherein the closing member is the second member. 7. At least a part of the metal member is inserted into the through hole, and a joint surface joined to the metal member on the through hole side of the closing member, and an edge portion of the metal member. a projecting portion provided between the inner portion space is provided, wherein the bonding glass layer is provided between the edge portion of the metal member said projecting portion and, wherein Item 6. A high pressure discharge lamp according to item 6. 8. At least a part of the metal member is inserted into the through hole, and an inner wall surface of the closing member facing the through hole is joined to the metal member over the entire length thereof. 7. The high pressure discharge lamp according to claim 6, wherein: 9. At least a part of the metal member is inserted into the through hole, and a part of an inner wall surface of the closing member is joined to the metal member via the joining portion.
And metallization layers is formed on a region where the joint portion of the inner wall is not provided, electrically connected ends of the <br/> Internal space side of the metallization layer to the electrode device The high pressure discharge lamp according to claim 6, wherein the high pressure discharge lamp is provided. 10. The interfacial glass layer is in contact with an inner wall surface of the closing member facing the through hole, and the interfacial glass layer and the main phase hermetically close the through hole, The high pressure discharge lamp according to claim 6, wherein a metal shaft is joined to a surface of the main phase on the inner space side, and a metal member is joined to an outer surface of the main phase. 11. A ceramic discharge tube having an internal space filled with an ionized luminescent material and a starting gas, the ceramic discharge tube having an opening at its end, and an electrode provided in the internal space. A high pressure discharge lamp comprising a device and a metal member, wherein the metal member and the ceramic discharge tube constitute an airtight bonded body, and the bonded body is any one of claims 1-5. A high pressure discharge lamp comprising the joined body according to claim 1, wherein the metal member is the first member and the ceramic discharge tube is the second member. 12. At least a part of the metal member is inserted into the opening, and a joining surface joined to the metal member is provided on the opening side of the ceramic discharge tube, and an edge portion of the metal member. a projecting portion provided is provided between the inner portion space, characterized in that the bonding glass layer between the projecting portion and the edge portion of the metal member is provided, claim 11. The high pressure discharge lamp described in 11. 13. At least a part of the metal member is inserted into the opening, and an inner wall surface of the ceramic discharge tube facing the opening is joined to the metal member over its entire length. The high-pressure discharge lamp according to claim 11, which is characterized in that: 14. At least a part of the metal member is inserted into the opening, and a part of an inner wall surface of the ceramic discharge tube is joined to the metal member via the joining portion. and metallization layers is formed on a region where the joint portion of the inner wall is not provided, that end of the inner portion space side of the metallization layer is electrically connected to the electrode device The high-pressure discharge lamp according to claim 11, which is characterized in that: 15. The interface glass layer is in contact with an inner wall surface of the ceramic discharge tube facing the opening, and the interface glass layer and the main phase hermetically close the opening, The high pressure discharge lamp according to claim 11, wherein a metal shaft is joined to a surface of the main phase on the inner space side, and a metal member is joined to an outer surface of the main phase. 16. A method for producing a joined body of a first member made of metal and a second member made of ceramics or cermet, wherein the first member and the second member are: Made of a sintered body of metal powder, a porous skeleton having open pores is arranged,
A glass melted at a temperature lower than the melting point of the metal constituting the porous skeleton is impregnated into the open pores of the porous skeleton, thereby forming the porous skeleton and an impregnated glass phase impregnated into the open pores. By generating a main phase consisting of, and at this time molten glass is allowed to flow into the interface between the second member and the main phase to generate an interface glass layer, the first member and the second A method for manufacturing a joined body, which comprises joining a member.