JPS62216971A - Composite structure of ceramic part and metal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite structure in which ceramic parts are attached to metal.

Traditionally, when brazing various ceramic parts, such as those with a large surface area such as various heat-resistant and wear-resistant liners, to a metal base metal, it is important to consider the difference in thermal expansion coefficient between the base metal and the ceramic. It was very difficult because of its size. Therefore, it is common practice to sandwich a flexible metal such as copper to relieve the stress caused by brazing, or to sandwich a metal with an adjusted coefficient of thermal expansion for brazing. Met.

However, as the joint surface bond of ceramic parts becomes larger, the stress caused by brazing cannot be fully absorbed, and the ceramic becomes more likely to crack, which has become a problem.

The present invention has been made in view of the above circumstances.

The composite structure of ceramic parts and metal of the present invention is:
On the back side of the ceramic component, a metal mounting plate that will be a female mold and a connecting plate that will be a male mold made of ceramic of the same material as the ceramic component or a material with a similar coefficient of thermal expansion are placed on a tapered surface or stepped. The ceramics and the bonding plate are assembled using a bonding material for ceramics or a duck brazing material to prevent the above three parts from coming apart, and then these are soldered to a fully contracted base metal. It is characterized by being attached by attaching, welding, or mechanical fixing methods.

The ceramics of the ceramic parts in the present invention include alumina, silicon nitride, nitride-containing titanium silicon nitride, silicon carbide,
It is a dense and strong ceramic sintered body made of partially stabilized zirconia, sialon, titanium carbide, or aluminum nitride.

Ceramic parts targeted by the present invention include metal parts such as heat-resistant and wear-resistant liners made of various ceramics, wear-resistant parts for measuring tools and machine tools, rocker arms and piston heads of engine parts for automobiles, etc. These are various parts that need to be strongly bonded to ceramics.

The principle of the structure of the present invention will be explained with reference to the cross-sectional configuration diagram of FIG. A component generally known as a metal mounting plate (2) made of ordinary stainless steel, carbon steel, aluminum base metal, heat-resistant base metal, etc. is arranged on the back side of ceramic component +11. Furthermore, ceramic parts f
Made of ceramics that are compatible with IL, or a single metal with a similar coefficient of thermal expansion.

A bonding plate (3) made of ceramics, graphite, or a composite material thereof is arranged. At this time, the mounting plate (2) and the joining plate (3) each have a tapered surface (4) as shown in the figure.
The female and male shapes are designed to fit together as a curved or stepped surface. The above ceramic parts (
The above +1+
l The parts (2) and (3) are joined to each other so that they do not come off, and then, at the same time or later, they are fixed to the base metal (7) by brazing, welding, or a mechanical method for assembly.

In the present invention, the ceramic component (1) and the bonding plate (3i
In order to join the
-Mn-5i02 metallization treatment using a composition based on Ti, Zr, l(f, Nb, V).

Contains active metal elements such as 1 to 40% by weight, with the balance being Cu.
, Ag, Sn, Ni, Co, Fe
, Cr, Mn, W, Ta, No
.

5i, C: Metallized using a metallizing composition containing no unavoidable impurities, and then Ni
After plating, etc., it is also possible to join by brazing using pot soldering, gold soldering, copper soldering, etc.

In addition, a foil of an active metal brazing filler metal containing the active metal element described above, with the remainder consisting of various elements as described above, or a layered metal foil of these component elements is bonded to the ceramic component F1+ (3). 203 y 2 o 203 y 2 o 203 y 2 o
3 series.

5in2- MgO-41203 series, 5in2-
At203- Y2O3-5iC system, SiO□-A
1203-MgO-sic system, sio□-A12
03- Y2O3-Si3N4 system or 5i02
Mg0-A! ! 203- It is also possible to interpose an inorganic bonding agent such as Si3N4 type between both parts and melt and bond them.

When joining using these joining methods, since the thermal expansion coefficients of the two are almost the same, it is possible to achieve an ideal strong joint, so the shear strength is lθ ~ 50 kg.
/tm2 can be achieved. The metal mounting plate (2) is not bonded, but is simply mechanically assembled with the joining plate (3) on a tapered, curved or stepped surface, so that it cannot be separated from the ceramic component (1). Even if the bonding plate (3) is bonded to the bonding plate (3) at a high temperature, the attachment plate (2) does not apply stress to the bonding plate (3), and no distortion remains. The metal mounting plate (2) can be attached directly to the base metal (7) to be attached by brazing or welding, or by providing bolt holes, or by welding, brazing, or caulking bolts or stand pins. Let's talk, Sara (
ζ It is also possible to pass a bolt or stand bottle through the base metal and indirectly attach it to the base metal by screwing, welding, brazing, caulking, or other methods. At this time, even if the bonding area is small, since it is a metal-to-metal bond, strength can be maintained and a highly reliable product can be obtained.

Furthermore, in the present invention, a coil spring, plate spring, disc spring, or bimetal made of gold rA is installed in the space f81 between the back surface of the joint plate (3) and the surface of the base metal (7) to be attached.

Heat-resistant synthetic rubber and elastomer, large and flexible copper, aluminum, and silver with heat ff + Hfi, or base metals made of these as main components, flexible graphite sheets, coil springs, leaf springs, and 1111 springs made of S-minute stabilized zirconia. Metal mounting plate (2) during turning at high or extremely low temperatures by inserting
To prevent it from expanding or contracting, creating a gap between the joining plate (3) and the tapered or stepped surface, causing loosening or rattling, or an impact load applied to the ceramic parts. It is also possible to have a soothing effect by making it W&.

As described above, the present invention does not make it possible to connect large-area ceramic parts and the base metal to be attached, which was a national problem in the past, but also allows the use of a metal base that can be used in high temperatures or extremely low temperatures. In particular, silicon nitride, silicon carbide, sialon, etc. are highly heat resistant, wear resistant, and strong, but their thermal expansion coefficients are 8.2 to 4.
5X10/”C and the value of general metals 10.0 to 20.O
The present invention is particularly effective when a new ceramic sintered body having a value that is only a fraction of that of X LO-6/'C is used for the various parts mentioned above. The significance of the present invention is extremely great because it provides a method for attachment.

Examples of the present invention will be described below.

Example 1 In Fig. 2, the ceramic part (9) is a stepped plate made of pressureless sintered silicon nitride with an average angle of 50w and a thickness of 5w.
The same silicon nitride thickness as 0), 4 layers, bottom diameter 35 mm,
Tapered cylindrical plate with 60° edge, metal mounting plate (1
1) is a square with a thickness of 4fi and sides of 50mg, has a hole in the center with a tapered cylindrical surface that engages with the joint plate (10), and pins α with a dish-shaped head and a diameter of 6fi at the four corners. A square part made of 545cm material with a hole shaped to fit the head of a pigeon, 5a+ thick, 50m x 5mm in diameter, and a dish-shaped Inconel stand with a thickness of 0.3m, a diameter of 85mm, and a height of IM. As the base metal to be attached, I prepared a base metal H made of 345C steel with four holes in the thickness for installation.

Next, Cu is placed between the silicon nitride part (9) and the bonding plate (10).
- Sandwich the brazing filler metal (15) for ceramic bonding of a Ti-Nb based amorphous base metal, attach the mounting plate (11) to the +9+l tlol, fit it into a jig, and braze it in a hydrogen flow of approximately 920'C1. A structure of the present invention was produced by an additional treatment. This is the above-mentioned pin α, disk spring 03)
It was assembled to the base metal (14) as shown in the figure, and the tip of the pin was arc welded to the base metal (I4) to firmly connect it.

The structure of the present invention is arranged so as to interlock with a silicon nitride ceramic component (9) and the same ceramic component 6e) adjacent to each other at stepped edges (+191 (+9)) as shown in the figure. By doing this, it is possible to produce a ceramic liner that does not expose the metal parts to the surface at the joints even at high temperatures, and it is possible to produce a ceramic liner that does not expose the metal parts to the surface at the joints even at high temperatures. Although the test was repeated, no cracks or other damage were observed and good results were obtained.

Example 2 The eighth factor shows an example in which the composite structure of ceramic parts and metal of the present invention is applied to a rocker arm for an automobile engine. A pressureless sintered body of 513N4 with a 22 angle angle is used as a ceramic chip component with excellent wear resistance, and a disc-shaped ceramic screw υ made of the same material is used as a joint plate.A cold forged steel inner side is used as a metal mounting plate. 0.2 mm thick press-processed copper layer is installed inside for cushioning, and 0.2 mm between the base metal, the cast gA rocker arm body (goods), and the joint plate. A copper disc with a thickness of m -
Place. Ceramic parts (Ni-Cr-Nb-Zr-5i-
A C-8iC metallization composition is applied and welded in a non-oxidizing atmosphere at a high temperature of 1200° C. or higher to perform metallization treatment, and the surface is further plated with Ni. At the interface between the bonding plate υ and the metal mounting plate ■, the stepped surface is made into a deformed beveled ζ curved surface as shown in the figure to prevent excessive stress from concentrating on the ceramic. Apply a wax stopper to prevent the wax from going around.

The above parts -, round, - and A, mortar ↓1. (2) were arranged as shown in the figure, and the entire structure was assembled by brazing and brazing so that the load was applied to the interface between the shishishite υ, the interface between the shishishite and the candle, and the joint surface.

Even if the parts of this example were taken out of the brazing furnace at 400'C during cooling and left to cool, the ceramics would not crack and residual stress and distortion due to differences in thermal expansion would be completely eliminated. I was able to connect it by doing so. The overall joint strength was also sufficiently high, with a shear strength of 25 Kg 7m2.

As described above, according to the present invention, ceramics with a particularly low coefficient of thermal expansion, which was previously impossible, can be firmly attached to ordinary metal materials, and the groove structure can sufficiently withstand mechanical damage and thermal shock. We were able to provide a complex that can do this.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram showing the principle of the structure of the present invention. FIG. 2 is a sectional view showing an actual example in which the structure of the present invention is applied to a ceramic liner. Patent Applicant: Japan Hybrid Chikunoroses Co., Ltd. (No change in content) 1st 2nd Procedural Amendment June 2511, 1985 1 Indication of Case Patent Application No. 57642, 1985 3
Relationship with the case of the person making the amendment Patent applicant

Claims (1)

[Claims] On the back side of the ceramic component, a metal mounting plate that serves as a female mold and a connecting plate that serves as a male mold and is made of ceramic of the same material as the ceramic component or a material with a similar coefficient of thermal expansion are attached with a tapered or stepped surface. The ceramics and the bonding plate are assembled using a ceramic bonding material or a metal brazing material to prevent the above three components from coming apart, and then these are brazed, welded, or A composite structure of ceramic parts and metal, which is characterized by being attached using a mechanical fixing method.