JPH01226777A - Ceramic member provided with metallic piece and method for bonding ceramic member to metallic material - Google Patents

Abstract

PURPOSE:To firmly bond a ceramic member and a metallic material by providing a recess on the ceramic member, brazing a metallic piece into the recess, and brazing the bottom of the metallic piece to the metallic material at the time of bonding the ceramic member having excellent resistance to wear and heat to the surface of the metallic material. CONSTITUTION:When the ceramic member 2 is bonded to the surface of the metallic material 4 by brazing, a recess 1 is provided on the lower surface of the member 2, a metallic piece 6 to fit into the recess is brazed into the recess of the member 2 at a bonding surface 3 through a grazing part 9-1. The lower surface 5 of the piece 6 is then bonded to the metallic material 4 through a grazing part 9-2. In this case, a protrusion 7 is provided on the bonding surface 5 of the piece 6, an insertion hole 8 is provided on the metallic material 4, the protrusion of the piece 6 is inserted into the insertion hole of the metallic material 4, and the piece 6 is brazed to the metallic material 4 through the brazing part 9-2. The breakage of the ceramic 2 due to a thermal expansion coefficient difference during the cooling can be prevented, and a bonded material of the ceramic member and the metallic material which is not stripped off is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to metal members (for example, stirrer blades, blower parts, etc.) in which the surface of a metal material is covered with ceramics bonded to improve wear resistance and heat resistance. This invention relates to a ceramic member suitable for manufacturing and a method of using the same.

[Prior art] Ceramic pieces are brazed onto metal surfaces to cover them.
Joined bodies of ceramics and metals are widely used.

The metal material (hereinafter abbreviated as base metal material) to be coated with the ceramic piece is usually soldered as described below. FIG. 6 is a diagram showing an example of conventional brazing.

4 is a base metal material, 10 is a thermal stress buffer material, 11 and 1
2 is a brazing material, and 13 is a ceramic piece. During soldering, the entire laminate shown in Figure 6 is at the melting point of the brazing material (approximately 800°C).
The temperature is raised above, the brazing filler metal solidifies, and then cooled to room temperature. Because ceramics and metal materials have different coefficients of thermal expansion,
Direct soldering generates large thermal stresses, for example during the cooling process, which can cause the joint to come loose or break the ceramic. Therefore, the ceramic piece is usually soldered to the base metal material with a thermal stress buffer material 10 made of a soft metal or a material having a coefficient of thermal expansion between that of ceramics and the base metal material. However, this method has the following problems.

B. In Fig. 6, the entire back side of the ceramic piece 13-1 is soldered, so if L is large, for example, the difference in shrinkage between the ceramic piece 13 and the base metal material 4 will increase during the cooling process, resulting in heat The stress buffering material 1O alone is insufficient, and the ceramic pieces are likely to be damaged or peeled off. For this reason, although small ceramic pieces of 20 aim x 20 inches are commonly used, the ceramic pieces may still be damaged.

During soldering, the brazing material melts, but the ceramic piece is placed on top of the molten brazing material, so the ceramic piece shifts and moves, for example, as shown in ceramic piece 13-2 in FIG. The width of the joints between the ceramic pieces becomes uneven. If the width of the joint between the ceramic pieces becomes too wide, performance will be impaired at the joint, and if it becomes too narrow, adjacent ceramic pieces will press against each other, leading to breakage of the ceramic pieces after cooling.

JP-A No. 56-149383 discloses a method in which a space having a neck portion is formed in a ceramic member and metal is cast into this space, and JP-A No. 59-128277 discloses a method in which a space having a neck portion is formed in a ceramic member and metal is cast into the space. A method of joining is shown. However, in all of these methods, the ceramic piece is mechanically joined to the metal, and therefore a highly precise connection part is provided on the ceramic piece; This is not easy, and if only mechanical fitting is used, the ceramic piece is likely to be damaged by thermal stress or impact stress during use.

[Problems to be Solved by the Invention] The present invention provides a ceramic member that can reduce thermal stress when brazing ceramics to a base metal material;
The object of the present invention is to disclose a method for brazing this ceramic member to a predetermined position on a base metal material while keeping the joint width uniform.

[Means and effects for solving the problems] The present invention provides (1) a ceramic piece 2 having a recess 1 on the back surface as shown in FIG.
and a metal piece 6 having a fitting surface 3 that fits into the recess and a joining surface 5 that joins to the base metal material 4, the recess 1 of the ceramic piece and the fitting surface 3 of the metal piece are brazed together, It is a ceramic member equipped with a metal piece, and (2) it is equipped with a metal piece according to the above (1), in which the joint surface 5 in FIG. 3 is a joint surface provided with a protrusion 7 for joining. (3) In FIG. 4, a fitting hole 8 is provided on the surface of the base metal material 4 into which the protrusion 7 of the ceramic member of (2) is fitted, and the ceramic member according to (2) above is provided. This is a method of joining a ceramic member to a base metal material, in which the fitting hole 8 of the base metal material 4 and the protrusion 7 of the ceramic member are fitted and joined using a brazing material.

The present invention will be specifically explained below.

FIG. 1 is a diagram showing an example of the structure of a ceramic member of the present invention.

(A-1) is a plan view of ceramic piece 2, (A-2)
is its xx sectional view. A recess 1 is provided in the ceramic piece 2.

(B-1) is a plan view of the metal piece 6, and (B-2) is its Y
-Y sectional view. The metal piece 6 has a fitting surface 3 corresponding to the recess of the ceramic piece 2 and a bonding surface 5 between the base metal and the base metal. In the present invention, since the ceramic piece 2 and the metal piece 6 are soldered together, the fitting surface 3 fits into the recess 1. Any size or shape that allows a loose fit is sufficient.

(C) shows the recess 1 of the ceramic piece and the fitting surface 3 of the metal piece.
This is a diagram showing a state in which the two are soldered together.

In the figure, 9-1 is a soldering part.

(D) is an enlarged view of the soldered part 9-1, with a thermal stress buffer material 10 sandwiched between the ceramic piece and the thermal stress buffer material. An active brazing filler metal 11 with a composition of Obtained by cooling to room temperature. During this cooling, the ceramic member 2 and the metal piece 6
Thermal stress occurs due to the difference in coefficient of thermal expansion, but
Since Q of the soldered portion is smaller than L of the whole ceramic piece, the generated thermal stress is also small and absorbed by the thermal stress buffer 10, so that the ceramic piece is not destroyed.

Although an example in which the activated brazing filler metal 11 is used has been explained, a good brazing filler metal may also be obtained by metallizing the recess 1 of the ceramic piece and using the active brazing filler metal instead of ordinary B Ag-8 in the same manner as above. A contact portion 9-1 is obtained.

Although an example has been described in which the shape of the recess 1 and the fitting surface 3 is a truncated cone, other shapes may be used, as illustrated in FIG. 5, for example.

FIG. 2 is a diagram showing an example in which the ceramic member shown in FIG. 1 <C> is brazed to the base metal material 4. The ceramic member is brazed to the base metal material 4 at the joint surface 5 of the metal piece. This soldering is a joining between metals, and a sound soldered part 9-2 can be easily obtained, and during this soldering, a large thermal stress is generated in the soldered part 9-1 between the ceramic piece and the metal piece. I won't let you.

FIG. 3 is a diagram showing an example of another ceramic member of the present invention. This ceramic member is formed using a metal piece 6 having a protrusion 7 on a joint surface 5.

This protrusion 7 prevents the ceramic member from shifting from a predetermined position and making the width of the joint of the ceramic member uneven when the ceramic member is soldered to the base metal material 4.

FIG. 4 is a diagram showing the ceramic member shown in FIG. 3 being soldered to a base metal material.

In FIG. 4(A), a fitting hole 8 into which a projection 7 is fitted is provided in advance on the surface of the base metal material 4 at a position where a ceramic member is to be set. The projections 7 of each ceramic member are fitted into fitting holes 8 provided in the base metal, and the ceramic members are fitted and bonded using a brazing material. When ceramic members are joined by this method, the ceramic members are positioned by the protrusion 7 and the fitting hole 8 and do not shift during soldering, so a joint with a desired width can always be obtained. Although an example in which the protrusion has a cylindrical shape has been described, the protrusion may have another shape as illustrated in FIG. 5, for example.

[Example 1] 50X as shown in FIG. 1 (A-1) (A-2)
It has external dimensions of 50 x 4 mm, that is, L = 50 + am, and has a diameter of φ20 x 1.5 m + a, that is, II = 20 on the back side.
Ag2O-based ceramic piece 2 with m+a concavity 1
An active metal brazing filler metal of BAg-8 composition containing 2% Ti is placed in part (9-1) of the
Nine ceramic members shown in FIG. 1(C) were made by joining S41tR metal pieces 6 at 840° C. for XIO minutes in a vacuum furnace. Then, as shown in FIG.
The above ceramic members were arranged in 3 x 3 pieces on a 150 x 4 mm SS41 steel 4, BAg-1 brazing material was placed on the joint surface (9-2) between the metal piece 6 and the metal material 4, and the ceramic members were placed in a hydrogen atmosphere furnace. Bonding was carried out at 670° C.XtO minutes. Using the conventional method as shown in FIG.
O, type ceramics bonded together are thermal stress buffering materials.
Even when O was used, the ceramics were damaged, but no damage was observed in the above bonded body.

[Example 2] 20X as shown in FIG. 1 (A-1) (A-2)
It has external dimensions of 20 x 4 + am, that is, L = 20 mm, and has a diameter of φ10 x 1.5 + am, that is, fl = 10 on the back side.
AQzOs ceramic piece 2 having a recess 1 of +am
An active metal brazing filler metal of BAg-8 composition containing 2% Ti is placed in the (9-1) part, and the part to be embedded in the ceramic is φ9.8 x 1.5 m, as shown in Figure 3.
Then, 255 ceramic members shown in FIG. 3 were made by joining 5S41 steel metal pieces 6 with protrusions of φ5×2+am in a vacuum furnace at 840° C. for 10 minutes.

Then, as shown in FIG.
X 4+am SS41 steel 4 with φ5. IX2.1111
11 fitting holes 8 are provided at 20 m+m intervals, 5 x 5, and BAg-1 is provided on the joint surface (9-2) between the metal piece 6 and the metal material 4.
A brazing filler metal was placed and bonding was performed at 670° C. for 10 minutes in a hydrogen atmosphere furnace. The spread of the joints between the ceramic pieces is suppressed,
In addition, a healthy bonded body was obtained, with no pressing of the ceramic pieces against each other.

[Example 3] As shown in FIG. 1 (A-1) (A-2), 20
It has external dimensions of
B Ag-8 where 2% Ti is contained in the (9-1) part of the Si, N, based ceramic piece 2 having the recess 1 of mna.
In the first step, a copper metal piece 6 with a diameter of 9.8 x 1.5 mm was bonded at 840°C x 10 minutes in a vacuum furnace using an active metal brazing filler metal of the same composition.
Ten ceramic members shown in Figure (C) were created. Next, the ceramic member was 30×25×
BAg-1 was applied to the 12 mm SS41 steel 4 on the joint surface (9-2) between the metal piece 6 and the metal material 4, as shown in FIG.
A brazing filler metal was placed and bonding was performed in a hydrogen atmosphere furnace for 670''CX10 minutes.

When the shear bonding strength of the brazed joint was measured, it was found to be 50 kgf/am'' on average.The fracture occurred at the bonding surface (9-2) between the metal piece 6 and the metal material 4, or at the ceramic.

[Effects of the Invention] When the ceramic member of the present invention is used, a bonded body of ceramic and metal material can be obtained without generating large thermal stress in the ceramic piece or the base metal material, and the ceramic and metal material are able to absorb heat during joining. It will not be damaged by stress.

Furthermore, when the ceramic member of the present invention having the protrusion 7 on the joint surface 5 is used and the ceramic member is bonded to a metal material by the method of the present invention, a uniform joint with the desired width is always obtained. The performance of the bonded product between metal and metal is improved, and the bonding work can be performed easily.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the configuration of a ceramic member of the present invention, Fig. 2 is a diagram showing an example of the ceramic member of the present invention being brazed to a base metal, and Fig. 3 is a diagram showing an example of the structure of a ceramic member of the present invention. Figure 4 shows the ceramic member shown in Figure 3 being soldered to a base metal material. Figure 5 shows the shape of the recess in the ceramic, the shape of the mating surface of the metal piece, and the shape of the protrusion of the metal piece. FIG. 6 is a diagram illustrating another example of the present invention in which the fitting hole is made of a different metal material. (A-1) (B-1) (B-2) (C)
CD) Figure 1 Figure 3 (A) CB) Figure 6 Procedural amendment (method) % formula % 1. Indication of case 1988 Patent Application No. 050600 2. Title of invention Ceramic member with metal piece and Method 3 for joining ceramic members to metal materials, and its relationship to the case of the person making the amendment Patent applicant address: 2-6-3 Otemachi, Chiyoda-ku, Tokyo Name (66
5) Nippon Steel Corporation Representative Yutaka Saito 4, Agent address 4-24-3-6 Shinbashi, Minato-ku, Tokyo 105
, "Column for brief explanation of drawings" of the specification to be amended 7. On page 12, line 19 of the specification of the contents of the amendment, the statement "is." has been replaced with "Figure 6 shows an example of the conventional method." This is a figure shown in the figure below.

Claims (3)

[Claims] (1) A ceramic piece 2 having a recess 1 on the back surface, a metal piece 6 having a fitting surface 3 that fits into the recess and a bonding surface 5 that joins to a metal material 4, are connected to the recess 1 of the ceramic piece and the metal piece. A ceramic member comprising a metal piece, characterized in that it is soldered to a fitting surface 3 of the metal piece. (2) A ceramic member including a metal piece according to claim 1, wherein the bonding surface 5 is a bonding surface provided with a protrusion 7 for bonding. (3) Projections 7 of the ceramic member on the surface of the metal material 4
A ceramic piece 2 is provided with a fitting hole 8 into which it is fitted, and has a ceramic piece 2 having a recess 1 on the back surface, a fitting surface 5 which fits into the recess, and a bonding surface 5 having a bonding protrusion 7 which is bonded to the metal material 4. The fitting hole 8 of the metal material 4 and the protrusion 7 of the ceramic member are connected using a ceramic member including a metal piece, in which the metal piece 6 is soldered to the recess 1 of the ceramic piece and the fitting surface 3 of the metal piece. A method for joining a ceramic member to a metal material, characterized by fitting and joining using a brazing material.