JPH0531574A - Brazing method for ni-based heat resistant alloy - Google Patents

Abstract

PURPOSE:To provide the brazing method for a precipitation hardening type Ni-based heat resistant alloy. CONSTITUTION:This brazing method for the Ni-based heat resistant alloy consists in subjecting the brazing surfaces of the precipitation hardening type Ni-based heat resistant alloy members contg., by weight %, >=1.5% Ti and >=1.5% Al to dry blasting by fine glass powder or ceramic powder of >=500mum grain size, then by applying an Ni brazing filler metal or Co brazing filler metal on the surfaces and heating the members in a vacuum higher than 5X10<-5>mmHg for >=5 minutes at >=950 deg.C, in the case of brazing of the above- mentioned members by using the Ni brazing filler metal or Co brazing filler metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing method for a precipitation hardening type Ni-base heat resistant alloy member, and more particularly to a moving blade, a stationary blade, a combustion product and a disk for a gas turbine, a steam turbine, a high temperature blower, a boiler, The N such as a jet engine
The present invention relates to a brazing method for a component manufactured using an i-based heat resistant alloy.

[0002]

2. Description of the Related Art Ti: 1.5% or more, Al:
Precipitation hardening type Ni-based heat-resistant alloys containing 1.5% or more have poor wettability of the brazing material, and the brazing surface has been Ni-plated for brazing. If you try to braze a narrow part of the high temperature member to a deep groove with a width of 1 mm and a depth of 1 to 2 mm, it is difficult to apply Ni plating, and the Ni plating work requires days and skill. The cost will be higher.

[0003]

DISCLOSURE OF THE INVENTION Conventional precipitation hardening Ni
When brazing a base heat-resistant alloy, it is necessary to perform Ni plating as a pretreatment for the brazing work. Not only the Ni plating has the above-mentioned difficulties, but also the work environment and waste liquid treatment due to the use of acid chemicals. There was a drawback that consideration was necessary.

In view of the above-mentioned state of the art, the present invention aims to provide a brazing method which does not have a problem with the precipitation hardening type Ni-base heat resistant alloy as in the conventional method.

[0005]

The present invention is based on the weight percent T
When a precipitation hardening Ni-based heat-resistant alloy member containing i: 1.5% or more and Al: 1.5% or more is brazed using a Ni brazing material or a Co brazing material, the brazing surface has a grain size of 500 μm or less. After dry blasting with fine glass powder or ceramic powder, Ni brazing material or Co brazing material is applied, and then at a temperature of 950 ° C. or more for a time of 5 minutes or more, 5 ×
This is a brazing method for a Ni-base heat-resistant alloy, which comprises heating in a vacuum higher than 10 ⁻⁵ mmHg.

[0006]

[Function] A precipitation hardenable Ni-based heat-resistant alloy having a Ti content of 1.5% or more and an Al content of 1.5% or more in weight% has a thin (generally a few μm or less) coating of a dense oxide of Ti and Al on its surface. Since it is generated, the wettability of the Ni brazing material or the Co brazing material is considered to be poor.

Therefore, in order to remove the dense oxide film, a dry blast treatment is carried out by using glass powder of hard material or ceramic powder such as alumina. By this dry blasting treatment, the dense oxide film on the surface of the precipitation hardening Ni-based heat-resistant alloy is removed, and at the same time, the surface roughness of the Ni-based heat-resistant alloy is roughened (the depth from the surface is several μm to several tens μm).
It is presumed that the processed layer of (3) is formed), the specific surface area of the brazing surface becomes large, and the brazing material easily diffuses. However, when the particle diameter of the glass powder or the ceramic powder exceeds 500 μm, the surface roughness after blasting becomes too large, and the N
Since the i-based heat resistant alloy cannot be used as a high temperature member,
The particle size of these powders should be below 500 μm. As the blast material powder, a ceramic powder (generally Hv: 1000 or more) harder than the hardness of the Ni-based heat-resistant alloy (generally Hv: 500 or less) is preferable.

Precipitation hardening type N that has been dry-blasted as described above.
When a Ni brazing material or a Co brazing material is applied to the surface of the i-based heat-resistant alloy and brazing with another material is performed by heating at a temperature of 950 ° C. or higher for a time of 5 minutes or longer. If the degree of vacuum is poor (for example, 10 ^-4 mm
Hg) Ti and Al are reoxidized and the surface of the Ni-based heat-resistant alloy is covered with an oxide film, which deteriorates brazing. Therefore, the heating atmosphere should be in a vacuum state higher than 5 × 10 ⁻⁵ mmHg.

[0009]

Example: C: 0.15%, Cr: 8.25 in% by weight
%, Co: 10.1%, Mo: 0.67%, W: 10
%, Ta: 3.01%, Ti: 1.07%, Al: 5.
53%, B: 0.02%, Zr: 0.09%, Hf:
1.41%, Ni: Precipitation hardening type Ni-base heat-resistant alloy consisting of the balance 40 mm long, 40 mm wide, 5 mm thick plate-shaped test material was used, and glass having a grain size of 100 to 300 μm was used on the brazing surface. Dry blasting was performed by blowing the powder at a nitrogen gas pressure of 6 kg / cm ² for about 8 seconds.

Furthermore, as shown in FIG. 1, the length is 15 m.
Place a thin plate of m, width 15 mm, thickness 2 mm of SUS310,
The powdered Ni brazing material shown in Table 1 was applied around the gap between the two, and the brazing operation was performed by heating in a high vacuum furnace of 5 × 10 ⁻⁵ mmHg at 1080 ° C. for 15 minutes.

As a result, as shown in FIG. 2, the brazing material sufficiently penetrated into the brazing surface and good results could be obtained.

[Table 1]

Similar results were obtained when the powdered Co brazing material shown in Table 2 was used instead of the Ni brazing material shown in Table 1 above.

[Table 2]

[0013]

According to the method of the present invention, the precipitation hardening type Ni-base heat resistant alloy can be easily brazed to another member, and its industrial effect is remarkable.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of brazing according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a state after brazing shown in FIG.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C22C 19/05 Z 8928-4K (72) Inventor Hachiro Terauchi Hijigo Betsusho, Miki City, Hyogo Prefecture Within Osaka Metallurgy Kogyo Co., Ltd.

Claims (1)

Claims: 1. By weight%, Ti: 1.5% or more, Al:
A precipitation hardening Ni-based heat resistant alloy member containing 1.5% or more is
When brazing using i brazing material or Co brazing material, the brazing surface is dry-blasted with fine glass powder or ceramic powder having a particle size of 500 μm or less, and then Ni brazing material or Co brazing material is applied, Then, a brazing method for a Ni-base heat-resistant alloy, which comprises heating at a temperature of 950 ° C. or higher for a time of 5 minutes or longer in a vacuum higher than 5 × 10 ⁻⁵ mmHg.