JPH01215769A - Production of ceramic-metal coupled body - Google Patents

Abstract

PURPOSE:To obtain the title coupled body with excellent bond strength and reliability without forming oxidized film, by heat treatment, in a non-oxidative atmosphere, of a ceramic-metal coupled body with a ceramic body fitted into an alloy with precipitation-hardening potential. CONSTITUTION:Firstly, a projected part 2 of a ceramic member 1 such as of Si3N4 is pressed and fitted into the recessed part 4 of an intermediate member 5 consisting of an alloy with precipitation-hardening potential (e.g., incoloy 903) bonded to, through e.g., frictional pressure contact, one end of a metallic member 3. Thence, the resultant ceramic-metal coupled body is heated at e.g., ca. 720 deg.C for ca. 8hr in a non-oxidative atmosphere (e.g., N2) and further retained at ca. 620 deg.C for 8-10hr to perform heat treatment to effect precipita tion hardening, thus obtaining the objective coupled body of high bond strength.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a ceramic-metal composite.

(Prior art) Conventionally, a convex part of a ceramic member is fitted into a concave part of an alloy member made of a precipitation-hardened alloy in a non-precipitation-hardened state, and then the convex part of the ceramic member is fitted and bonded, and then the combined body is subjected to precipitation hardening treatment. A method for obtaining a metal composite was known from JP-A-61-40879. That is, as shown in FIG. 1, a protrusion 2 is provided on a ceramic member 1, and a metal intermediate member 5 made of a low thermal expansion metal is provided between the protrusion 2 and a metal member 3. Create a recess 4 in the member and press fit.

After being firmly joined together by a method such as cold fitting, a heat treatment for precipitation hardening treatment was performed in the atmosphere to obtain a ceramic-metal composite.

(Problems to be Solved by the Invention) When the precipitation hardening treatment is performed in the air, that is, in an oxidizing atmosphere, as described above, the outer peripheral surface of the convex portion 2 of the ceramic member 1 at the cancer joint end 6 and the metal intermediate member 5 Since the shape of the mating end of the intermediate member gradually changes (for example, taper or R) between the inner circumferential surface of the recess 4 provided in the intermediate member,
There is a problem in that heating creates a gap based on the difference in thermal expansion between the members, and an oxidizing atmosphere enters the gap to form an oxide film. Furthermore, a gap is created between the outer circumferential surface of the convex portion 2 of the ceramic member 1 and the inner circumferential surface of the concave portion 4 of the intermediate member 5 due to the difference in thermal expansion between the members due to heating, and an oxide film is formed on the entire surface. There were also problems that arose.

The purpose of the present invention is to solve the above-mentioned problems and provide a method for manufacturing a ceramic-metal composite that can easily realize a ceramic-metal composite that has good bonding strength and high reliability. It is something to do.

(Means for Solving the Problems) The method for manufacturing a ceramic-metal composite of the present invention is to produce a ceramic-metal composite in which a ceramic is engaged with a metal part of a precipitation hardening alloy in a non-oxidizing atmosphere. The metal part of the body is precipitation hardened by heat treatment.

(Function) In the above-mentioned configuration, after the convex part of the ceramic member and the concave part of the metal member made of a precipitation hardening type alloy are bonded together, the precipitation hardening process is performed in a non-oxidizing atmosphere. Since it is possible to completely prevent the formation of an oxide film on the inner circumferential surface of the recess, especially on the joint edges, the resulting ceramic-metal composite will not have excessive stress caused by the oxide film, and will be stable. It becomes possible to maintain good bond strength.

(Example) An example of the manufacturing method of the present invention will be described below with reference to FIG. 1.

First, SNCM 439. SACM 645. S.A.
A metal member 3 made of a heat-resistant alloy such as CM 435,
An intermediate member 5 having a recess 4 made of a precipitation hardening alloy such as Incoloy 9o3°YAG 300 is joined by friction welding. Next, a ceramic member 1, such as a turbocharger rotor, is prepared in a conventional manner, and the convex portion 2 is press-fitted into the concave portion 4, and the ceramic-metal composite is formed by cold shrinking or shrink-fitting in a non-oxidizing atmosphere. obtain. Note that it is preferable to use silicon nitride, silicon carbide, sialon, or the like as the ceramic material.

Next, the obtained ceramic-metal composite is subjected to a heat treatment for precipitation hardening in a non-oxidizing atmosphere, preferably a nitrogen atmosphere. For this heat treatment, it is necessary to select the optimal treatment depending on the metal that constitutes the four parts 4. For example, when Incoloy 903 is used, it is heated at 720°C in a non-oxidizing atmosphere.
After heating for X8 hr, it was further held for 620'CX8 to 1 Ohr, and then cooled in the air or allowed to cool in the furnace.

An actual example will be explained below.

A convex part 2 with a diameter of 12 mm of a ceramic member 1 made of 5i3Nn having the shape shown in FIG. Inner diameter 11.9mm
and the recessed portion 4 were connected by press fitting. After that, the bonded body was heated to 720”CX8 in nitrogen atmosphere and argon atmosphere.
The composite of the present invention was obtained by performing a precipitation hardening treatment using a heat treatment schedule of heating at 620° (xBhr) and air cooling after heating at 620° (xBhr).For comparison, the same material, the same shape, the same press-fitting conditions, Comparative composites were also prepared that had the same treatment heat schedule but were heat treated in air, ie, in an oxidizing atmosphere.

A bending test was carried out by applying a load to a position 401 from the joint end of each of the prepared joints of the present invention and comparative example, and the breakage load of the joint was determined. The results are shown in Table 1.

Chapter 1 Table FIG. 2 shows a partial sectional view of a second embodiment of the invention.

A convex portion 12 with an outer diameter of 10 mm of a ceramic rotor 11 made of Si and N4 having the shape shown in FIG. 2, and an SNCM 439
Example 1 A ceramic turbocharger rotor was constructed in which an intermediate member 15 having four press-fitted inner diameter parts 14 of 9.92 mm made of Incoloy 903 bonded by friction welding was coupled to one end of a metal shaft 13 made of It was manufactured by applying heat treatment under the same conditions as . The obtained ceramic turbocharger rotor was installed in a high-temperature rotation test device, and the circumferential speed was 500 m/sec using combustion gas at 900″C.
A rotation test was conducted for 200 hours at a rotation speed of 200, but no abnormality was observed.

The present invention is not limited to the embodiments described above,
For example, it can be suitably used for rotating bodies such as gas turbine engines.

(Effects of the Invention) As is clear from the above detailed explanation, according to the present invention, after the convex portion of a ceramic member is press-fitted into the recess made of a precipitation hardening alloy of a metal member, By performing the precipitation hardening treatment with a heat treatment schedule appropriate for each alloy, a ceramic-metal composite with stable and good bonding strength can be obtained without forming an oxide film.

[Brief explanation of the drawing]

Figure 1 shows ceramics to which the manufacturing method of the present invention can be applied.
FIG. 2 is a cross-sectional view showing an example of a metal composite body, and FIG. 2 is a cross-sectional view of a ceramic turbocharger rotor to which the present invention is applied. 1... Ceramic member 2.12... Convex portion 3...
・Metal member 4.14... recess 5.15...
・Intermediate member 6...Gun joint end 11...Ceramic rotor 13...Metal shaft Fig. 1 Fig. 2

Claims (1)

[Claims] 1. A ceramic/metal composite body consisting of a metal part of a precipitation hardening alloy and a ceramic mated to the metal part, which is characterized by precipitation hardening of the metal part of the composite body by heat treatment in a non-oxidizing atmosphere. Method for producing conjugate.