JP2883223B2 - Method of joining ceramic member and metal member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a ceramic member and a metal member, and more particularly to a method for joining a ceramic member and a metal member using a precipitation hardening alloy as the metal member. .

[0002]

2. Description of the Related Art In recent years, mechanical parts used under high loads and high temperature atmospheres in various types of industrial machine equipment include heat resistance,
Ceramic members excellent in corrosion resistance and abrasion resistance, high in strength and small in specific gravity have been frequently used. However, since the above ceramic members are poor in workability, the parts where high temperature acts are composed of ceramic members with excellent heat resistance, corrosion resistance, wear resistance and low specific gravity, and the parts where high loads act are processed with high strength. A composite structure combining a ceramic member and a metal member, such as a composite member composed of a metal member having excellent properties, has attracted attention, and various joining methods of the ceramic member and the metal member have been studied and proposed.

[0003] For example, Japanese Patent Application Laid-Open No. 3-69570 discloses that a precipitation hardening type alloy is used as a metal member, and a ceramic member is joined to the metal member via a filler metal material. Discloses a method of performing a treatment for precipitating and hardening the metal member while keeping the furnace cool.

[0004]

However, in the method of joining a ceramic member and a metal member, the material metal is generally subjected to a solution treatment before machining, and a concave portion is formed in the material metal by machining. Things as metal members,
During the cooling process after the melting and filling process in which the ceramic member is joined to the metal member via the filling metal material, a process is performed in which the metal member is deposited and hardened by maintaining the furnace in a cooling process.

[0005] Therefore, when forming a concave portion by machining from a material of a precipitation hardening alloy in the metal member, heat generation and distortion generated by the machining causes a solution treatment performed on the material metal before machining. The effect has been lost.

[0006] In the case of the precipitation hardening type alloy in which the effect of the solution treatment is lost, even if the precipitation hardening treatment is performed while maintaining the furnace cooling during the cooling process after the melt filling treatment, the precipitation hardening treatment is performed after the melt filling treatment. High temperature strength to generate sufficient shrink-fit stress in the fitting portion between the ceramic member and the metal member during cooling, the bonding strength between the ceramic member and the metal member is weak, and the bonding is unstable. There were challenges.

[0007]

SUMMARY OF THE INVENTION A method of joining a ceramic member and a metal member according to the present invention comprises a solution treatment step of forming a concave portion in a metal member made of a precipitation hardening alloy and then solution-treating the metal member. A fitting step of fitting a joint of a ceramic member to a concave portion of the metal member after the solution treatment through a filler metal material having a melting point higher than the precipitation hardening temperature of the precipitation hardening alloy; A melting and filling process in which the filling metal material is melt-filled between the joint of the ceramic member and the concave portion of the metal member by heating the furnace to a temperature equal to or higher than the melting point, and furnace cooling is maintained during a cooling process after the melting and filling process And a precipitation hardening step of depositing and hardening the metal member forming the concave portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for joining a ceramic member and a metal member according to the present invention will be described in detail. In the joining method of the present invention, first, after a concave portion of a metal member made of a precipitation hardening alloy is formed by machining or the like, it is kept in a vacuum or an inert gas atmosphere at a predetermined temperature for a predetermined time or more, and then quenched. As a result, deterioration and distortion due to heat generated during machining of the metal member are removed, and the effect of the precipitation hardening process after the melt filling process, which is the final process of joining, is enhanced.

The above-mentioned precipitation hardening type alloy is not particularly limited, but Incoloy 903, 9 which is an iron-based alloy mainly containing nickel (Ni) and cobalt (Co).
04 and 909 can be suitably used.

The solution treatment is carried out at a solution treatment temperature of 95%.
The temperature is preferably in the range of 0 ° C. to 1050 ° C. If the temperature is outside the range, the solution becomes insufficient or the grains grow, which is not desirable. On the other hand, in order to sufficiently obtain the effect of solution treatment, it is preferable that the holding time at the solution treatment temperature is 10 minutes or more and 120 minutes or less. Further, it is preferable that the cooling rate after maintaining the solution temperature is rapidly cooled at 500 ° C. or more per hour to prevent precipitation of another crystal phase.

Next, a joint of a ceramic member having the same shape, which is several tens μm smaller than the internal dimension of the concave portion, is formed in the concave portion of the metal member after the solution treatment, and the melting point higher than the precipitation hardening temperature of the precipitation hardening type alloy. Fit through the filled metal material.

Although the ceramic member is not particularly limited, silicon nitride, silicon carbide, zirconia, alumina and the like can be preferably used.

The filler metal material has a melting point higher than the precipitation hardening temperature of the precipitation hardening alloy and lower than the melting point of the precipitation hardening alloy, such as silver brazing, palladium brazing, copper brazing and nickel brazing. Such a filled metal material is used in a disk shape or a ring shape obtained by stamping and forming a plate material of the material, or in a shape in which a wire material of the material is wound.

Further, the above-mentioned filled metal material is heated and melted to a temperature not lower than the melting point, and the filled metal material is filled between the joint of the ceramic member and the concave portion of the metal member. In the process, the solidification is reached while the solidification temperature is reached, and at the same time, the solidification is performed while cooling to room temperature. Further, the melting and filling process can be performed in a state where a load is applied so that the joint portion of the ceramic member and the concave portion of the metal member are in close contact with each other.

[0015] In the cooling process after the melting and filling process, the furnace is kept in a predetermined temperature range for a predetermined time or longer to precipitate and harden the concave portion of the metal member. As a result, the recess is hardened by solute precipitation from the supersaturated solid solution, and the high-temperature strength required for joining with the joint of the ceramic member is obtained. Furthermore, shrink-fit stress generated from the difference in the amount of shrinkage based on the difference in the thermal expansion coefficient between the joint and the recess acts to increase the joining force.

The above-mentioned precipitation hardening temperature is preferably within ± 100 ° C. from the precipitation hardening temperature, and the holding time is also 10 minutes.
If it is less than minutes, sufficient precipitation hardening cannot be attained, so that sufficient bonding strength cannot be obtained, and no change is observed in the bonding strength even when it is held for a long time exceeding 300 minutes. Therefore, the holding time is preferably set to 10 minutes or more and 300 minutes or less.

Hereinafter, a method for joining a ceramic member and a metal member according to the present invention will be described in detail with reference to specific examples. FIG. 1 is a cross-sectional view in which a main part of a joined body of a ceramic rotor and a metal shaft joined by applying the joining method of a ceramic member and a metal member according to the present invention is partially cut away. In FIG. 1, reference numeral 1 denotes a ceramic rotor which is a ceramic member in which a joint 2 is fitted in a concave portion 4 formed by joining a metal shaft 6 to a metal sleeve 3 which is a metal member made of a precipitation hardening alloy. A filler metal material 5 is melt-filled between the joint 2 of the member 1 and the metal sleeve 3 to form a joined body of a ceramic rotor and a metal shaft.

The ceramic rotor 1 is made of silicon nitride (S
i ₃ N ₄₎ as a main component, as a sintering aid yttria (Y ₂ O ₃₎ and ratio _of tungsten oxide (WO ₃₎ becomes such a silicon nitride sintered body containing a junction 2 of a ceramic rotor 1 It is formed in the center. On the other hand, the metal sleeve 3 is made of Incoloy 909 which is a precipitation hardening type alloy having a solution temperature of 980 ° C.
Are joined to form the recess 4. The outer diameter of the joint 2 is 10.00 mm, and the inner diameter of the metal sleeve 3 is 10.08.
mm. The inner peripheral surface of the metal sleeve 3 was plated with nickel in order to improve the wettability of the filler metal material 5 made of silver solder of BAg-8 having a melting point of 780 ° C. to the metal sleeve 3.

First, the ground metal sleeve 3 is heated and held in a vacuum furnace at a temperature of 980 ° C. for T ₁ hour, ie, 60 minutes, under a heat treatment condition as shown in FIG. Introduce gas and use cooling fan for T ₂ hours,
That is, it was forcibly cooled to room temperature over about 110 minutes. Thereafter, the inner peripheral surface of the metal sleeve 3 was plated with nickel having a thickness of about 10 μm.

The metal sleeve 3 is connected to the ceramic rotor 1
And a silver brazing material having a melting point of 780 ° C. and equivalent to the BAg-8 standard is placed on the end face of the joint 2 as a filling metal material 5. The thus assembled product was set with the silver brazing portion set upward, a load was applied so as to press the metal sleeve 3 against the joining portion 2, and at a temperature of 830 ° C. in a vacuum furnace under the heat treatment conditions shown in FIG. Holding for t ₁ hour, that is, 15 minutes, the filling metal material 5 was melted and filled between the joint 2 and the metal sleeve 3. Thereafter, argon gas was introduced into the vacuum furnace, and the cooling fan was used for t ₂ hours, that is, 610 for 60 minutes.
C., forcibly cooled to 610 ° C. for t ₃ hours, that is, 300 minutes, and then again using a cooling fan as described above.
_It was forcibly cooled to room temperature for ₄ hours, that is, 60 minutes.

In the cooling step, first, the above-mentioned filled metal material 5
When the temperature reaches 780 ° C. or lower, which is the solidification point of the molten metal, the molten filler metal material 5 solidifies and joins the joint 2 and the metal sleeve 3. Next, while maintaining the temperature at 610 ° C., the metal sleeve 3 is hardened by the precipitation of the solute from the supersaturated solid solution, and the high-temperature strength required for bonding with the bonding portion 2 is obtained. Unless the above-mentioned solution treatment is applied to the metal sleeve 3 which has been ground, sufficient bonding strength cannot be obtained.

After joining the ceramic rotor 1 and the metal sleeve 3 as described above, the metal shaft 6 is electronically beam-welded to the end surface of the metal sleeve 3 and the ceramic shaft is finished by machining. A joined body of a rotor and a metal shaft was manufactured.

With respect to the joined body of the ceramic rotor and the metal shaft, the pull-out strength of pulling out the ceramic rotor 1 from the metal sleeve 3 integrated with the metal shaft 6, and the torsional strength of twisting the ceramic rotor 1 and the metal sleeve 3 in opposite directions. Was measured in an atmosphere of 500 ° C., and it was found that the conventional joint without the solution treatment had a pull-out strength of 5.0 kg /
less than mm ^2, torsional relative strength that is 3.6 kg / mm ² or less, 5.4~6.0kg / mm ² is抜強degree in assembly by bonding method of the present invention, the torsional strength is 3.7
An improvement of the bonding strength of 4.0 kg / mm ² was confirmed.

Further, as a result of conducting a high-speed high-speed rotation test using the joined body of the same lot at an exhaust gas temperature of 950 ° C., the conventional joined body was broken at 150,000 revolutions per minute. It was confirmed that the joined body obtained by the joining method of the present invention did not break even at 200,000 revolutions per minute and was joined well.

[0025]

As described above in detail, in the method for joining a ceramic member and a metal member according to the present invention, a filler metal material having a melting point equal to or higher than the precipitation hardening temperature is melted before being fitted to the joint of the ceramic member. Between the concave portions of the metal member subjected to the chemical treatment, the filled metal material solidifies during the subsequent cooling process, and the joining portion and the concave portions are joined, and the concave portions are formed by the precipitation hardening process during the subsequent cooling process. Precipitation hardens to obtain the high-temperature strength required for joining with the joint, and shrink-fit stress is generated between the joint and the recess due to thermal shrinkage, increasing the joining strength between the two. Even when the melting point of the material is higher than the precipitation hardening temperature, the joining strength does not decrease, and the ceramic and metal members that constitute the joined body are maintained while maintaining the high joining strength, and the durability is excellent. Especially high temperature oxidizing atmosphere It is possible to obtain the bonded body of the ceramic member and the metal member is capable of long-time continuous use in air.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in which a main part of a joined body of a ceramic rotor and a metal shaft joined by applying a joining method of a ceramic member and a metal member according to the present invention is partially cut away.

FIG. 2 is a view showing heat treatment conditions for performing a solution treatment by the method for joining a ceramic member and a metal member according to the present invention.

FIG. 3 is a view showing heat treatment conditions for a melt filling process and a precipitation hardening process in the method for joining a ceramic member and a metal member according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic member 2 Joint part 3 Metal member 4 Depression 5 Filled metal material

Claims (1)

(57) [Claims] 1. A solution treatment step of forming a concave portion in a metal member made of a precipitation hardening alloy and then solution-treating the metal member, and forming a joint of the ceramic member in the concave portion of the metal member after the solution treatment. A fitting step of fitting via a filler metal material having a melting point higher than the precipitation hardening temperature of the precipitation hardening type alloy, and heating the filler metal material to a temperature equal to or higher than the melting point and joining the filler metal material to the joining portion of the ceramic member. And a melt-filling process of melting and filling between the recesses of the metal member, and a precipitation hardening process of depositing and hardening the metal member forming the recesses by furnace cooling during the cooling process after the melt-filling process. A method for joining a ceramic member and a metal member, comprising: