JPS629787A - Hot hydrostatic pressure treating method - Google Patents

Abstract

PURPOSE:To reduce the treating cost by covering the periphery of a treating material with the inert ceramics particle of high softening point and by performing a hot hydrostatic pressure as well by arranging the ceramics material having lower softening point than the treating temp. on the out-most layer. CONSTITUTION:The treating materials 2, 2 performing a solid phase joining are arranged inside the metal made container 1 of stainless steel, etc. and the periphery thereof is surrounded by the ceramics A3 which is of high softening point, inert chemically and does not contaminate the treating materials 2, 2. The ceramics B4 of high softening point and fine grain size is used as the intermediate layer. The ceramics C5 of the glass of low softening point, etc. becoming an integral ceramics C5 of the glass of low softening point, etc. becoming an integral capsule with the softening flow under the hot hydrostatic treating temp. is used as the outmost layer. The hot hydrostatic treatment is performed in this state. The ceramics C5 of the outmost layer joins with solid phase the treating materials 2, 2 by forming a gas nonpermeable film with its softening melt. The treating cost is reduced by the reclaiming use of materials.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an in-phase joining method using H-P (hot isostatic pressing method).

[Conventional technology]

■ In the capsule method, the object to be treated is degassed and sealed in a metal or glass container, and then subjected to H-P treatment.

However, this method has drawbacks such as high cost due to the use of electron beam welding, contamination of the workpiece by molten glass, and the difficulty that it can only be applied to workpieces with simple shapes.

■ A method in which the opening at the bonding interface is sealed and degassed using an electron beam, followed by H-P treatment.

This method is expensive and cannot be used for solid phase joining of metals/ceramics.

■ The molten bath method is a method in which the object to be treated is subjected to H-P treatment using molten glass as a pressure transmission medium.

With this method, solid phase bonding is not possible because molten glass penetrates into the opening.

[Problem that the invention seeks to solve]

The conventional solid-phase bonding method using H-P requires complicated and expensive work before degassing and sealing and pre-firing, and also has shape limitations as it can only be applied to objects with simple shapes. there were.

In the present invention, in addition to solving the above-mentioned drawbacks by using three or more types of ceramics such as glass with different characteristics and a container (metallic case), it is also possible to reuse some of the glass materials. It also made it possible to reduce the material costs required for HIP processing.

[Failure to solve the problem]

The material to be treated is placed in a metal case, surrounded by ceramics such as glass, and a material with a low softening point is used for the outermost layer of the ceramic, and a material that does not contaminate the material to be treated is used for the innermost layer. do.

[Effect]

The outermost ceramic layer melts at the H-P treatment temperature and becomes gas-impermeable, and the isostatic pressure from the H-P is applied to the material to be treated via the ceramic on the (C) side.

〔Example〕

As shown in Fig. 1, the materials to be processed 2, 2 to be subjected to solid phase bonding are placed in a container (metallic case) L, and the materials to be processed are chemically inert and have a high softening point. Material 2.2 is surrounded by ceramic A3 of coarse grain size that does not contaminate the material.

For the outermost layer, a ceramic C5 such as glass with a low softening point that softens Km at the IIP treatment temperature and becomes an electrified capsule is used, and as an intermediate layer, a ceramic B4 such as glass with a high softening point and fine grain size is used.

Tests were conducted under the following conditions for the purpose of solid-phase bonding of metals. The material to be treated 2 was 10X10 as shown in Figure 2.
Prepare two pieces of 5US430.7 with a size of X5”.

The parts to be joined were back polished. This 2g material to be treated 2
were stacked and set in A3 ceramics such as glass.

■ Money, l! The thickness of the case l made by 1& is 0.5WR.
A thick type stainless steel one measuring 110φ×200H was used.

(Three) As Glass Temple's ceramic A3, we used transparent quartz glass, which has a softening point of 1580°C, which is higher than the temperature of H-P and has a coarse grain size of 1 to 2nφ.

■ Ceramic B4 of the glass issue was a transparent quartz glass similar to A, and the particle size was 200M, a fine kumquat.

(The softening point of Shigarasu Valley ceramic C5 is 8.
A fine-grained borosilicate glass having a temperature of 20°C, which is lower than the IiP temperature, and a particle size of 200M, was used.

Processed material 2-5 to be in-phase joined in stainless steel case l
Two US43QJ specimens and various ceramics such as glasses 3 and 4.5 were charged in a layered manner without adding any binder, etc., as shown in Fig. 3 (1000℃ x 100100O/cIrL).
2 x 1.5 hours).

At 1000°C, borosilicate glass softens and melts, forming a gas-impermeable film that covers the top surface inside the stainless steel case.
Material to be treated using quartz glass as pressure transmission medium-8US43
Give 0J an isotropic positive value. Furthermore, since quartz glass has no impurities and is inert, it does not contaminate SO343QJ.

Through this hIP treatment, it was confirmed that the two pieces of SUS 430 J were diffusion bonded as shown in the microstructure of FIG. 4. Also, the shear strength of this part is 20 kgf/M
There was IL2.

The glass capsule exhibits an external structure as shown in Figure 5, and it can be seen that layers of three polar types of ceramics such as glasses with different physical properties are formed.

Glass J- may be made of two layers depending on the case. For example, 2
When repairing one of the 13 casting defects, fine ceramic particles with a sieve softening point are placed directly around the material to be treated, and ceramic particles with a low softening point are placed on top of the ecl.
i! It doesn't work even if you do H/P processing.

In addition, in this specification, the reason why the ceramic A surrounding the processed material is described as coarse grain is to prevent the ceramic A from entering the bonding interface of the processed material, and for purposes other than bonding, it is particularly coarse grained. Therefore, there is no need to set the number to 3 or more.

[Effects of the invention] (a) Since the molten glass-purified ceramics can maintain airtightness between the materials to be treated, the process of capping the metal case and degassing and sealing it by electron beam welding is possible. No longer needed.

(b) Ceramics such as glass used for the inner layer do not change in quality at all even under the B-processing temperature, so they can be recovered and used for writing purposes.

(c) Mainly used ceramics such as glass are m? J
Like glass capsules (there is no need for pre-firing or binding materials, and there is no need to make a slurry).

) Preliminary fj'a formation, degassing and
For some crow and full-length cases that do not require a sealing process, it is possible to make capsules that are inexpensive, easy to store, and can be recovered and reused.

(e) By using a wood capsule, it becomes possible not only to perform in-phase bonding but also to remove internal defects in sintered bodies as well as surface defects in castings.

[Brief explanation of drawings]

, 241 shows a capsule in which ceramics of type 3A are combined and a processed material of 'U is embedded in it. Fig. 2 shows the treated material used for solid phase bonding. Fig. 3 shows HI A graph showing the operation pattern of the i' process is shown. Figure 4 is a photograph showing the microstructure a of the joint interface. The fifth problem is an enlarged view of the glass capsule. ■... Gold A-14 Case 2... Material to be treated 3
... Ceramics such as glass A 4 ... Ceramics such as glass B 5 ... Ceramics of glass thickness C Figure 1 CQ Li □ Procedural amendment (Hogen November 6, 1985)

Claims (1)

[Claims] When improving or joining materials to be treated using the hot isostatic pressing method, after charging the materials to be bonded into a container, a chemically inert ceramic with a high softening point is placed around the materials to be bonded. A hot isostatic pressure treatment method that is characterized by covering with particles, placing a ceramic material with a softening point lower than the treatment temperature in the outermost layer, and then applying hot isostatic pressure.