JPS5887206A - Porous sintered metallic material and its production - Google Patents

Abstract

PURPOSE:To carry out good plating down to the inside of pores by dipping a porous sintered metallic material into a plating soln., agitating the same forcibly in such a way that the plating soln. passes and flows in the internal voids to accomplish substituted plating then carrying out electroplating thereon. CONSTITUTION:A porous sintered metallic material is formed by sintering and integrating the inside part of powder particles 1 of Al of irregular shapes so that voids 2 are formed among the respective particles 1. Such porous material is dipped in a plating bath, and the bath is agitated forcibly to allow the plating bath to pass and flow through the inside of the voids 2, thereby forming plating layers on the outside surface of the porous material and the surfaces of the internal powder particles 2. Thereafter, electroplating is carried out upon this porous material without pretreatments such as defatting and washing at all. Thus, the uniform plating layers are formed satisfactorily in the inside as well.

Description

[Detailed Description of the Invention] The present invention relates to a porous 4-sintered material and a method for manufacturing the same.
For details, please refer to aluminum or its alloy WC.
At bottom, it is a sintered material of powder particles of *[referred to as A# material], which has a porous interior with a large number of holes between the powder particles, and has a good metal plating layer with a sufficient thickness. Regarding the porous gold F4 material and its manufacturing method, the gold II4 sintered material has a dense structure, but unlike the gold II4 sintered material, the porous electrical material has many pores inside. This porous material is different from the dense Araceae, but the meat M is 05 to 5.
．． Since the pores are formed within a volume of about 30 to 70 cm at a particle size of about 0 m, it is difficult to perform surface treatment on the surface or internal particle surfaces, and its uses are limited.

That is, in the porous sintered material made of 91D and A8M, the surface of each powder particle inside is covered with an oxide film,
゛It is easy to corrode, and if it is exposed to the atmosphere, especially in a corrosive atmosphere, Kg corrosion will progress rapidly and its applications will be limited. However, unlike porous sintered materials, which have a dense internal structure, irregularly shaped pores are formed in the internal sK.
Its telliO,IN is extremely large.

Even if plating treatment or monopolar oxidation treatment @ is performed, I
The A side is made of iron, and it is one picture to treat the inside. #Mi or 0
Since the surface treatment may proceed in advance, the treatment cannot be carried out internally.

Note that if there are pores inside and the shape of the pores is irregular, it is impossible to determine the conditions in the oxidation treatment, and it would be difficult to perform it industrially.
Gatsuki 1 to.

For this reason, painting may be considered as an alternative to the top-coating treatment, but although it may be possible to treat only the surface, it is difficult to coat the internal powder particle surfaces.

Therefore, the surface of the porridge that has been simply treated in a corrosive atmosphere is removed.

Corrosion progresses from the untreated internal parts and is exposed to the atmosphere, rainfall, and
*hvc awn rasu place K cannot be used.

17T, anodizing treatment has the same problems as mentioned above, but it is a technology developed as a surface treatment for one element.
It is thought that it is compatible with general surface treatment of Ag materials, but the anodic oxidation treatment method involves soaking the porous metal in a treatment layer such as porous acid, chromic acid, oxalic acid, etc., and pouring mt/lt as an anode. Even if the oxide layer is formed on the bottom of the can, the current flows inside the pores (1), and gases such as #!! marks generated during processing form iron particles in the irregularly shaped pores, causing the current to flow. Because of this, it is not possible to form a uniform and good Kw conversion reaction internally.Therefore, the combination of #j ultra-densification treatment and 1i11
1. M remains while the internal phagocytosis deteriorates.

Alternatively, when electroplating is performed, the metal component in the plating layer can be attached to the inside of the porous material with a machine string and attached to the long hole, but the inner plating layer is smaller than the surface. There is a dance between thinning and j! W.

When pickling, degreasing, and water rinsing are performed as a prerequisite for plating, chemicals from these pretreatments form ferrous substances in the pores, and during plating, these ferrous substances are retained (not exposed to the surface).・4: The purpose of the invention is to solve the problem of the upper Kiku point, and specifically, even if the porous metal sintered material is proposed a porous sintered metal in which a sufficient plating layer is formed inside (1) and a method for producing the same (K). According to this method, the pretreatment process can be omitted and the surface can be treated.

In other words, in the sintered material for one 8AK, the metal powder particles are sintered and bonded together, and many communicating holes are formed between the powder particles, resulting in porous sintering. #i of
- The formation of plating Ji# δ on surface 1 is defined as t# mold.

The first method is to immerse the porous mass J1 sintered firewood plating along the surface, and force the plating 'I&' to pass through the inner hollow barrier of the porous 5Ii sintered material. Stir to
This invention is characterized by displacement plating and then electroplating using a conventional method.

1. As shown in Fig. 1, AII powder particles 1 with irregular shapes inside are sintered and integrated into a porous material and sintered material, and each powder particle is formed by A hole 2 is formed in the space K. This porous material is immersed in the plating supply, and the plating bath is +I91 controlled & stirred, and in the summer, the plating bath is stirred so that it flows through the pores 2. As shown in Fig. 2, a plating field 3t is formed on the outer surface of the outer jacket and on the surface of the powder particles 2 inside.In this case, the porous material is plated with 0% button without any pretreatment such as degreasing or washing with water.

That is, prior to electroplating as in the conventional method, pickling, oil, etc. are applied to the plate, and the chemicals at this time form ferrous substances in the pores. For this reason, wash with water! When the chemicals are forced to circulate through the pores 1 inside the tank, the chemicals can be completely removed from the pores, but the amount of water that has been washed causes iron to form in the pores. Therefore, #L is poured into the plating solution to dilute the plating solution, and as a result, the currents tlf and t'L are blocked by the washing solution, resulting in a good metal key with a uniform and sufficient wall thickness. I can't get it.

Point 1: In the method of the present invention, after sintering, the porous V is hardly contaminated with oil and fat jaws, etc.Ktr
Prior to the eye plating process, is the plating process carried out in a plating acid without any pre-treatment such as degreasing, pickling, or water washing? do. Therefore, since there is no pre-treatment, there is no problem of chemicals or water remaining in the pores.
Good plating resistance can be obtained.

To explain the history in detail, in the 0th row, the porous jetting of AJ material is done immediately after sintering by pouring, degreasing, and pickling.

Without pre-treatment of washing with water, the reel is immersed in a stannic acid sorter or potassium stannate plating,
Electroplating is performed by forcibly circulating plating acid. In this case, it is preferable to treat the oxidation reaction of 1 yen + ff 17 with 9 yen of free alkali for the K and the caustic potash (r6 p).

In this way, when immersed without pretreatment, it is possible to remove the contact film on the surface of the AIJ material by the reaction acid of the first order (1) and K (2), and at the same time remove each powder particle of the porous material. A uniform tin plating layer is obtained on the surface.

3 Na, 5n(OH), +4 A#-+3Sn +4
NaA#Oz+2NaOH+8 so 0
・・・・・・・・・(1) Ae 10 ~ aO) 1 + H2
0→NaA#Uz + 2 Hz -----"121 As is clear from this equation (2), the acid skin glands of the porous material remove the rock and the AI on the surface by the K111 reaction. In this case, if the reaction of formula 21 proceeds in advance, hydrogen gas will be generated violently, and the plating reaction according to formula (1) will proceed. 1 format, the fine tin plating layer cannot be seen.

Therefore, when adding caustic acid to remove oxidized film during plating, the plate-making process is carried out in such a way that the reaction of formula 11 proceeds smoothly. It is necessary to keep the plating acid in good condition.Also, when using a free alkali such as caustic soda for the reaction of Type 21, when hydrogen gas is generated, Some pinholes may be generated in the castle due to the actual gas.In this case as well, the b# of m in the plating #!
JI Garan 9 Upper (240-250 C) After heating the towel to as many bags as possible at 1, the towel can be quickly cooled and removed at a heat exchange.

Next, the 14th day of the ceremony will be held.

Thickness 3 is obtained by sintering gold maple powder (porosity 40 cm by volume) consisting of powder particles of A8 material in a reducing atmosphere.
(2) The porous sintered image was immersed in the plating process and displacement plating was performed while stirring during the plating process. To this plating acid, a stannic acid sorter of 80 to 100 r/#-caustic soda of 1 to 3 t/8 was added.

The tM* was rarely between 50 and 70C. In this way, the plating acid was treated with forced φIK accent δ.

After processing time of 3 to 5 minutes, the surface has a 2 to 5 μm thick awn with a shape of drinking awn f1. In the inner part, especially in the central part, a 9-metsky was formed.

Collection 1!2 1su, 5)! The porous material produced in the axis v/ll and lr'j was heated with lead (80~100 t/8) and hydrofluoric acid (2~) for oxidation & film removal. t9/
8) was crushed into the plating layer containing lead, and the plating chamber was forcibly circulated in the porous phase, causing the lead plating reaction to occur. The awns were evenly formed.

Wow, this plating reaction was performed based on the first-order (312) 2Ae+3Pb (BF4), -+3Pb+2A8 (BP
,).

・・・・・・・・・(3) In addition, it was sufficient to use plating acid once in the room.

LTC has added surfactant 2i to the porous material plating solution.
When /8 was applied to the skin, the plating acid easily entered the pore fat,
The plating reaction progresses rapidly inside, and as shown above, during the plating process, the free S in the plating solution is reduced.
苤弗## Degreeke 20-50ノ/IK increase.

When electroplated using a conventional method, the overall KIN awn was 2 ~
A 5μ plating acid was obtained.

Furthermore, it is possible to increase the concentration of free hydrofluoric acid using the projection method 11.
Ii, the sacrificial experience makes me vomit. Its original application is likely to be used for phase detection of lead-acid batteries.

To provide a plating layer on the inside of the porous M material to keep the θ clear and fc transparent.

Corrosion resistance and weather resistance are improved, making it possible to use it completely without any problems, and also for forming this plating layer.
The oxide film is completely removed by stretching and embedding in the plating layer without RT treatment.
'I will perform direct conversion plating 1 while it is done, so I [according to the reaction] =&
If it is a surface, the plating is formed on the inside of the surface, so pre-treatments such as greasing and washing can be omitted.

A thick island-like plating layer can be formed inside the pores.
52 years old, but 1 tree brother light method light AI drama infrared force outside the L A meeting 4 pieces A table 0 Examples can be used for processing zinc, nickel, -, chromium, and other porous materials.

[Brief explanation of drawings]

]Figure a base? Figure 2 shows a part of the structure of a part of porous gold jf4 sintered material made of porous metal sintered material according to the present invention V. The appearance is clear. Code 1...Each powder sheet 2...Pore 3...Plating I@% Injection 1 person Nippon Thai Acre Bite Co., Ltd. Tanukito 9f
− Hitoshi Suzuki, Physician and Matsushita Patent Attorney

Claims (1)

[Claims] 1) In porous tR bonding where metal powder particles are sintered and bonded to each other and a large number of communicating pores are formed between the powder particles, a plating layer extends to the surface of the internal powder particles. A porous precious metal sintered material with t% characteristics. 2) Immerse the porous JJ8 sintered material in the plating solution. Porous sintered gold and steel characterized in that the plating solution is forcibly stirred so as to flow through the internal voids of the porous sintered gold and steel material, displacement plating is performed, and then 1-air plating is performed by a conventional method. Method of manufacturing wood.