JPH0380162A - Method for joining ceramic parts with metallic parts - Google Patents

Abstract

PURPOSE:To increase the joined area and to increase the mechanical joining strength in brazing filler metals at the time of joining ceramic parts with metallic parts via the brazing filler metals by constructing the joined product so that the rugged grooves or projected lines of the ceramic parts are fitted or engaged with the projected lines or rugged grooves of the metallic parts over the whole body. CONSTITUTION:Rugged grooves 1c and 1d or projected lines are formed for the faces 1a and 1b to be joined in ceramic parts 1 as well as, for the faces 3a and 5a to be joined in metallic parts 3 and 5, projected lines 3b and 5b or rugged grooves fitted or engaged with the above rugged grooves 1c and 1d or projected lines and each having approximately same volume as that in the rugged grooves 1c and 1d or projected lines are formed. Furthermore, the ceramic parts 1 and the metallic parts 3 and 5 are heated and pressurized by interposing brazing filler metals 2 and 4 between them, so that joining is executed by the brazing filler metals 2 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for joining ceramic parts and metal parts.

[Prior Art] A ceramic-aluminum (,l) bonded structure is used, for example, in the flange portion of a heat exchanger using Na as a ripening medium. In this flange part, the heat exchanger side metal fitting and the piping side metal fitting are joined via an alumina ring, and the alumina link, the heat exchanger side metal fitting, and the piping side metal fitting are connected to A, Q.
It is heated and pressurized through a solder material made of aluminum. As this pressure bonding method, as shown in FIG. 10, solder materials 2 and 4 are interposed between the alumina ring 1 and the pipe-side metal fitting 3 and the heat exchanger-side metal fitting 5, and while heating in a vacuum atmosphere, The alumina ring 1, the pipe-side metal fitting 3, and the heat exchanger-side metal fitting 5 are joined by applying pressure.

[Problem to be solved by the invention] However, the above-mentioned joint structure of the alumina link 1, the pipe-side metal fitting 3, and the heat exchanger-side metal fitting 5 does not solve the problem that the alumina ring 1
Since both the upper and lower end surfaces of the material are flat, internal stress tends to separate the joint interface due to the difference in coefficient of thermal expansion between the two members, and as a result, if the mating cycle is repeated, the joint may peel. . Furthermore, as described above, it is not possible to increase the area of the bonding interface between the alumina ring 1, the pipe-side fitting 3, and the heat exchanger-side fitting 5, and therefore it is not possible to increase the mechanical bonding strength. At the same time, there was also the problem that the Na corrosion resistance was insufficient.

The purpose of this invention is to prevent A11 separation of the joint between a ceramic component and a metal component when subjected to thermal cycles, thereby improving durability, and increasing the mechanical joint strength by increasing the joint area. It is an object of the present invention to provide a method for joining ceramic parts and metal parts, which can further improve Na corrosion resistance.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention forms concave grooves or protrusions on the surfaces of ceramic parts to be joined, and
A protruding strip or concave groove that is fitted into or engaged with the concave groove or convex strip and has approximately the same volume as the concave groove or convex strip is formed on the surface of the metal component to be joined, and further, the ceramic component and the metal A method is used in which a reinforcing material is interposed between the parts, and the ceramic parts and metal parts are heated and pressurized to join them using the solder material.

[Function] By taking the means described in 1., the convex grooves or concave grooves of the metal member are entirely fitted or engaged with the concave grooves or convex lines of the ceramic component, so that the ceramic component and the metal It is possible to improve durability by alleviating thermal stress caused by differences in coefficient of thermal expansion with the parts, and since the single thread engages with the concave groove, the joint area of the joint is increased and mechanical Bond strength increases. Furthermore, by increasing the bonding area between the ceramic component and the metal component, the Na corrosion resistance of the bonding interface between the two components increases.

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIG. 2, the lower end surface (surface to be joined) la and upper end surface 1b (surface to be joined) of the alumina ring 1 as a ceramic component are made of A I -S i -Mg alloy LIIS.
Piping 1 made of Aj gold alloy as a metal part is inserted through solder materials 2 and 4 made of alloy number: BA4004).
Flange parts 3a and 5 of the metal fitting 3 and the heat exchanger side metal fitting 5
A. Pressure brazing, which will be described in detail later, is used to join the joints.

The purity of α-hole 1□03 forming alumina ring 1 is 7
It is 5% or more. In addition, the metal fitting 2.4 is composed of A (mainly containing Si: 6 to 13, Mg: 3°0% by weight or less,
It is made of an AlS1-Mg alloy that contains other impurities that can be avoided by cars. The material for forming both metal fittings 3 and 5 is A30 of JIS standard (alloy number) which is A, O alloy.
03 may also be used. This A1 alloy contains unavoidable trace impurities such as Si, Fe, Cu, Mn, Mg, Cr, and Z.
n, T i, etc. may be included.

Both end surfaces 1a and lb of the alumina ring 1 are provided with concave grooves over the entire circumference], c, 1. d is formed. Also,
Projections 3b and 5b are formed over the entire circumference of the joined surfaces of the flange portions 3a and 5a of the pipe-side metal fitting 3 and the heat exchanger-side metal fitting 5 so as to correspond to the concave grooves 1c and id. The shapes of the protrusions 3b, 5b and the concave grooves 1c, ld are substantially the same, or the solder materials 2, 4 are formed in the concave grooves 1. c,l
When the concave portion 41c enters into d, the convex portion 3b is formed within ld.
It is desirable that 5b is inserted exactly.

Next, based on FIG. 1, FIG. 2, and FIG. 5, the alumina ring 1, the pipe side fitting 3, and the heat exchanger fl! The method for pressure brazing with the IJ fitting 5 will be explained below.

As shown in FIG. 1, a brazing material 2, a pipe-side fitting 3, and a pressure jig 6 are arranged in this order on the lower end surface 1a of an alumina ring 1 inside a heating container (not shown).

Further, on the upper end surface 1b of the alumina ring 1, a brazing material 4, a heat exchanger side metal fitting 5, and a pressurizing jig 7 are arranged in this order.

Next, the heating container was placed in a vacuum state (5x 10-3nun
Hg) and keep the inside of the heating container at 10°C.
Heating is performed at a temperature increase rate of /min. Next, as shown in Figure 4, after holding the temperature at 600°C for 30 minutes,
After lowering the temperature to 580'C at a cooling rate of min for about 30 minutes, the alumina ring 1, brazing material 2, pipe side fitting 3, brazing material 4, and heat exchanger side fitting 5 are removed. A pressurizing force of 0.5 kg/- is applied using a pressurizing jig 67 to join the alumina link 1 to the pipe-side metal fitting 3 and the heat exchanger-side metal fitting 5. This pressurizing operation opens between the liquidus temperature and the solidus temperature. i L, do this until the in-phase line temperature is below. In addition, the pressurizing force is 0.05 kg/rrl'
From 20 kg/rr? In that case, there is no difference in bonding strength.

Next, annealing is performed by holding the temperature at 400°C for 30 minutes.

Furthermore, when the annealing is completed, the temperature is lowered to 150°C, and the joining work is completed. Obtain epiphytes.

The above-mentioned hard-bonded horizontal body includes the pipe side fitting 3 and the heat exchanger side fitting 5.
Since the protrusions 3b and 5b are fitted into the concave grooves 1c, ] and d, the joint area between the alumina link 1 and the pipe-side fitting 3 and the heat exchanger-side fitting 5 increases, and the mechanical target strength increases.

In addition, since the thermal expansion coefficients of the piping-side metal fittings 3 and the heat exchanger-side metal fittings 5 are larger than the thermal expansion coefficient of the alumina link 1, a force that tends to separate the two members in the direction shown by the arrow in FIG. In this embodiment, the protrusions 3b of the pipe-side metal fittings 3 and the heat exchanger-side metal fittings 5 move.

5b is fitted into the concave grooves 1c, ], d, the force in the peeling direction is alleviated, and the peeling resistance is improved when repeated cycle cycles are performed.

The joint structure of the alumina link 1 and both metal fittings 3 and 5, which had been bent by 9'' in this way, was immersed in Na for a long time while being held at a temperature of 450°C, and a helium leak test was conducted. As shown in Figure 5, out of the 20 samples that were immersed for 1000 hours, all of the samples using the joining method of the present invention passed the test.At the immersion time of 1500 hours, a total of 9 samples of 20 pieces passed, and for the 2000 hour case. is top 8 out of 20
One passed the exam. On the other hand, in the case of the conventional sample, if the sample was immersed for 1000 hours, a total of 9 pieces with a width of 20 pieces, 1500
Only 20 pieces per hour and 20 pieces per hour and 20 pieces per hour and 20 pieces per hour, respectively, passed the test. In addition, in the above test, the amount of helium leak was I
Those with a score of C or lower were considered to have passed.

In addition, when a tensile test was conducted without immersing in Na, the average tensile strength of five samples in the conventional example was 750 k.
g, but the present invention has an average tensile strength of 830
A high result was obtained. Further, after being immersed in Na for 240 hours while being maintained at 450°C, a tensile test was conducted, and the results shown in the following table were obtained. In the conventional example, the average tensile strength of five samples was 450 kg, but the present invention obtained a high result of 660 kg, which is the average tensile strength of five samples.

table Note that this invention can also be embodied as follows.

The brazing materials 2 and 4 may be divided into multiple parts as shown in Fig. 6, the concave groove 1C1d may be triangular as shown in Fig. 7, or U-shaped as shown in Fig. 8. , forming chamfers on the top and bottom corners of the concave lid as shown in FIG. 9, or providing concave grooves on the metal fitting side and providing protrusions on the alumina ring (not shown).

[Effects of the Invention] As detailed above, the present invention makes it possible to firmly connect a ceramic component and a metal component through a soldering material, improve heat cycle performance, and improve the bonding of both components. This has the effect of improving the Nar#J corrosion resistance of the parts.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an alumina link according to the present invention and a metal part having a flange portion before liquid phase bonding, Fig. 2 is a sectional view after liquid phase bonding, and Fig. 3 is a sectional view of the alumina link and the heat exchanger I'!
! ! Figure 4 is a perspective view showing an exploded view of W's l1ll Kintada, pipe side joint J-1, and Dokubayashi Natato 0. Figure 5 is a graph showing the relationship between Na immersion time and the number of leak test passes, Figures 6 to 9 are cross-sectional views of main parts showing other examples of this invention, and Figure 10 explains the conventional joining method. FIG. 1... Alumina link as a ceramic component, 1,
c, ld... Concave pipe, 2, 4... Woven material, 3... Piping side fitting as a metal part, 5... Heat exchanger side fitting as a metal part, 3b, 5b... Convex stripes, 6, 7...
Pressure jig.

Claims (1)

[Claims] 1. A concave groove or a convex line is formed on the surface of the ceramic component to be welded, and a concave groove or convex line is fitted or engaged with the concave groove or convex line on the surface of the metal component to be welded. forming protrusions or concave grooves with approximately the same volume as, and further,
interposing a brazing material between the ceramic part and the metal part,
A method for joining ceramic parts and metal parts, characterized in that the ceramic parts and metal parts are heated and pressurized to join them using the solder material.