JPS6254570A - Production of composite brazed member - Google Patents

Abstract

PURPOSE:To provide reduction in the weight of a device, etc. by forming a brazing filler metal layer consisting of an Al alloy contg. specific weight % of Si and having a prescribed thickness to a member such as pure Mo to be brazed then subjecting the member to vacuum brazing to a base material consisting of pure Al, etc. via the brazing filler metal layer. CONSTITUTION:The brazing filler metal layer contg. 3-14% Si is fixed and formed to 0.1-1mm average thickness on the brazing surface of the member which consists of any among pure Mo, Mo alloy, pure W and W alloy and is to be brazed. The base material made of pure Al or Al alloy is then superposed thereon in this state and is subjected to vacuum brazing via the brazing filler metal layer. Since the vacuum brazing is executed via the brazing filler metal layer consisting of the Al alloy, the brazing strength is improved and since the Al or Al alloy is used for the base material, the joint member of the device is lighter in weight. The improvement in the brazing strength and the reduction in the weight of the device are thus simultaneously made possible.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a composite wax that is lightweight, has a high cooling effect, and is suitable for use as, for example, a reflector for a carbon dioxide laser or an inner wall material for a vacuum furnace. The present invention relates to a method of manufacturing a mounting member.

[Conventional technology]

Conventionally, pure CL has generally been used as a reflector for carbon dioxide gas, for example.
The surface made of I has a mirror finish, and the surface is further coated with A.
ll plating is used.

However, with these Cu reflectors, when the laser irradiation time becomes long, metal and non-metal vapors generated from the processed material are deposited on the mirror surface, which not only reduces the reflectance but also causes the mirror surface to become more sensitive to the laser. Accidents have occurred in which the mirror absorbs energy and melts, damaging the reflector.

To prevent such accidents, it is necessary to periodically remove deposits from the mirror surface, but since the pure Cu and AL+ plating that makes up the mirror 1 is very soft, it is necessary to remove the deposits from the mirror surface when wiping it off. It was easily damaged and often caused damage to its reflective properties.

For this reason, in recent years, carbon dioxide lasers have been banned! )
The use of hard Mo instead of pure CU as a material for J-mirrors is becoming established. As this Mo reflector,
In particular, monocrystalline materials and polycrystalline materials with fine crystal grains exhibit excellent performance with less adhesion of evaporated substances.

[Problem that the invention seeks to solve]

On the other hand, since carbon dioxide laser devices are installed not only on the ground but also on space stations, there is a need for the devices themselves to be lighter. It is strongly desired to reduce the weight of a large (heavy) Mo reflector by one.

[Means for solving problems]

Therefore, from the above-mentioned viewpoint, the inventors of the present invention focused on Mo members such as Mo reflectors, MO alloy members, and similarly heavy W members and W alloy members, and tried to reduce their weight. As a result of extensive research, we found that a part of a member made of pure Mo, Mo alloy, pure W, or W alloy was made of light (low specific gravity) It+At or Al alloy, and on the other hand, For example, pure MO and pure Al have specific gravity (pure Mo
: 10.2. Pure At: 2.7), thermal expansion coefficient (![!MO:5X10''8/℃, pure Δt: 23.3
x 10-6/℃), and thermal conductivity (pure MO:
0.35 Cat/cm-8-℃, pure At: 0.53
Can/cm -3-'C) and other characteristics, so it is extremely difficult to braze these two parts with high bonding strength.
, Mo alloy, pure W, and W alloy, the Al alloy containing 3 to 14% by weight of Si is preliminarily applied to the brazing surface of the member by welding a foil or hot-dip plating. When a brazing material layer is firmly formed, and in this state, it is mated with the brazing surface of a pure Al or At alloy member, and vacuum brazing is performed through the brazing material layer.
They obtained the knowledge that brazing with high bonding strength is possible.

This invention was made based on the above knowledge, and the brazing surface of a member to be brazed made of pure Mo, Mo alloy, pure W, or W alloy is coated with Si: 3 to 3.
Contains 14% by weight. A brazing material layer with an average layer thickness of 0.1 to 1 # made of 11 alloy is fixedly formed, and the member to be brazed is connected to a substrate made of pure AJ or Δ1 alloy through the brazing material layer. This method is characterized by a method of manufacturing a composite brazed member, which comprises vacuum brazing the parts.

In addition, in the method of this invention, the Si-containing fleas in the brazing filler metal is limited to 3 to 14% by weight because the content is 3% by weight.
If the temperature is below 660°C, the melting point of the brazing material will become too high, exceeding 660°C, and a brazing temperature higher than the melting point of the base material may be required, making brazing impossible. Even if the content exceeds 14% by weight, not only will the melting point of the brazing filler metal exceed 660°C in some cases, but the reaction with the parts to be brazed will become significant, causing erosion. Therefore, the content of 1 was determined to be 3 to 14% by weight. Also, the reason why the average layer thickness of the brazing metal layer is set to 0.1 to 1M is because if the average layer thickness is less than 0.1m, it is not possible to secure the desired strong bonding strength. This is because if it exceeds 11 nIn, the brazing filler metal will protrude from the brazing surface, making post-treatment troublesome.

〔Example〕

Next, the method of the present invention will be explained using examples.

As the parts to be brazed, members each having the composition shown in Table 1 and having dimensions of 100 s in diameter and 12 mm in thickness were prepared, and the brazing parts [1] on one side of the part were
A brazing filler metal layer having the composition and average layer thickness shown in Table 1 is deposited in advance by the known means also shown in Table 1, that is, by welding over the brazing filler metal [placed on one side of the member]. 1
×10→torr vacuum, heating to a temperature of near 00°C, or hot-dip plating by immersion in molten brazing filler metal kept at a temperature of near 00°C, and then this brazing member is , which also has the composition shown in Table 1 and has the dimensions of diameter: 100 s x thickness: 20 m, is assembled via the brazing material layer, and on this
Pressure crab lX10'tor with K9 weight on it.
15 to a temperature within the range of 600-630 °C in a vacuum of r.
Each of Methods 1 to 8 of the present invention was carried out by performing vacuum brazing under conditions of holding for minutes to produce a composite brazed member.

Next, a specimen was cut out from the composite brazed member obtained as a result, and the tensile strength of the joint surface was determined by m11, and the results are shown in Table 1.

[Effects of the Invention] From the results shown in Table 1, in Methods 1 to 8 of the present invention, the l! T! Mo, Mo alloy, pure W.

and a member made of any one of W alloy, and pure 2
It is clear that it is possible to braze with a member made of A2 alloy or A2 alloy with strong joint strength.

As mentioned above, according to the method of this invention, pure MO, MO
It is possible to replace some of the 4T heavy 71 parts made of alloy, pure W, and W alloy with light pure △t or △ alloy, reducing the weight of various heavy parts. In addition, since pure aluminum or Al alloys have an excellent cold effect, these materials have excellent performance when applied to the manufacture of reflectors for carbon dioxide lasers, inner wall materials for vacuum furnaces, etc. Industrially useful effects can be obtained, such as the ability to be exerted throughout Nagato.

Claims (1)

[Claims] The brazing surface of a member to be brazed made of pure Mo, Mo alloy, pure W, or W alloy is Si:
Average layer thickness composed of Al alloy containing 14% by weight:
A brazing material layer of 0.1 to 1 mm is fixedly formed, and then the member to be brazed is bonded to the brazing material layer through the brazing material layer.
A method for manufacturing a composite brazing member, which comprises vacuum brazing to a base made of pure Al or an Al alloy.