JPH0240636B2 - TANSOKABUTSUHENOKINZOKUHIFUKUHOHO - Google Patents

Description

[Detailed description of the invention] [Detailed description of the invention] The present invention relates to a method for metal coating carbonized materials.

Conventionally, methods such as ion sputtering method, plasma method, electrolytic plating method, and chemical plating method have been used to coat carbonized materials with metal. However, these methods have the following drawbacks: (1) It is difficult to coat metal on large objects or objects with complex shapes; (2) It is difficult to coat fine details on objects with complex shapes. (3) There were disadvantages such as the equipment was expensive and the operation was complicated.

An object of the present invention is to provide a method for metal coating carbonized materials, which does not have these disadvantages and can provide sufficient coating through relatively simple steps.

As a result of intensive research, the present inventor has determined that a chlorine-containing resin that has been brought into contact with a metal is heated to a predetermined temperature in an inert atmosphere using an electric furnace, and that This object has been achieved by the present invention, which is characterized in that the metal contact surface to the carbonized material is coated with Cr or Fe-Cr during the process of carbonizing the material.

In the present invention, a powdered, branched, rod-shaped, or thread-shaped Cr metal or Fe-Cr alloy is brought into direct contact with a mixture that is partially or entirely chlorine-containing. Therefore, various shapes can be coated with metal depending on the shape of the compound.

The chlorine-containing resin used in the method of metal coating a carbonized material of the present invention is a resin containing chlorine in its composition, such as polyvinyl chloride (PVC), polyvinylidene chloride, or chlorinated rubber.

The metal used in the present invention is a metal containing Cr, such as Cr metal or a Cr-Fe alloy, and its shape is plate-like, rod-like, thread-like, powder-like, etc.

Next, the compound is a mixture of a chlorine-containing resin and an organic polymer compound or an initial condensate thereof that is compatible with (1), and the chlorine-containing resin is at least 20% by weight.
It contains. Alternatively, it is a mixture of a chlorine-containing resin and an inorganic filler such as graphite ceramics, and the chlorine-containing resin contains at least 20% by weight. These compounds are kept in contact with the metal in an electric furnace under an inert gas atmosphere,
Sintering is performed at 1100℃.

Firing temperature, firing speed, firing time, etc. vary depending on the substances constituting the compound.

According to the method of metal coating a carbonized product of the present invention, metal coating can be applied to suit the shape of any carbon product if possible, and the used metal can be polished to a new metal surface using a file or the like. By releasing the metal, it can be used repeatedly until the metal itself is exhausted. Thus, the method of the present invention does not require complicated operations, labor, or expensive equipment. Furthermore, carbon products of various sizes or shapes can be coated with metal within the volume of the electric furnace used, and the used metal can be used repeatedly until it is exhausted, making it an advantageous method for reducing costs.

Next, the present invention will be explained with reference to examples. In addition,
The present invention is not limited to these examples, but can be freely modified within the scope of the technical idea of the present invention.

Example 1 100 g of chlorinated vinyl chloride, 400 g of graphite powder with a particle size of about 10 μm, and 300 g of diallyl phthalate monomer were mixed for 10 minutes in a Henschel mixer.
The resulting mixture was kneaded using two rolls and then formed into a film. This film was extruded into a round bar shape of 2 mmφ with a plunger, and
As shown in Fig. 1, the round rod-shaped molded product obtained by cutting into mm pieces is made of granular SUS-302 with a particle size of 100 μm or less.
It was set so as to be covered with stainless steel, and then heated to 300°C at a rate of 5°C/hr in an inert atmosphere using a horizontal electric furnace shown in Figure 3, and further heated to 20°C/hr.
Raise the temperature to 1100℃ with hr and hold at 1100℃ for 3 hours,
Cooling was then performed. The metal contact surface of the obtained carbide was silvery gray. Figure 4 shows the results obtained using an X-ray microanalyzer (hereinafter referred to as XMA).

It was confirmed that the components of the obtained silvery gray material were mainly Cr and contained a small amount of Fe. Furthermore, the silvery gray material was uniformly coated on the surface of the carbon material.

Example 2 400 g of chlorinated vinyl chloride, 200 g of furan resin, 400 g of graphite powder with a particle size of 10 μm or less, and 200 g of diallyl phthalate monomer were placed in a stainless steel container, mixed, and the resulting mixture was transferred using two rolls. The mixture was kneaded and then formed into a film. The obtained film has a thickness of about 500 μm,
This was drawn flat and formed into a 50 mm x 50 mm square.

As shown in Figure 2, this was sandwiched between 100 mm x 100 mm x 2 mm plates of SUS-302 stainless steel, and then heated to 300 °C at a rate of 5 °C/hr in a nitrogen gas atmosphere using the horizontal electric furnace shown in Figure 3. The temperature was then raised to 1100°C at a rate of 20°C/hr, held at 1100°C for 3 hours, and then allowed to cool naturally. The metal contact surface of the obtained carbide had a silvery gray color, and as a result of examining the components of the silvery gray substance by XMA, it was confirmed that it was Cr and Fe.

Example 3 (In the case where all of the resin is chlorinated vinyl chloride resin) 400 g of chlorinated vinyl chloride resin powder and 200 g of diallyl phthalate monomer were thoroughly mixed in a Henschel mixer, and the resulting mixture was kneaded using two rolls. Then, it was formed into a film.

As shown in Fig. 2, the obtained film was
Set it so that it is sandwiched between metal Cr plates, and then
Using the horizontal electric furnace shown in Figure 3, the temperature was raised to 300°C at a rate of 5°C/hour in a nitrogen gas atmosphere, then further raised to 1100°C at a rate of 20°C/hour, and then heated to 1100°C.
The mixture was held for 3 hours and then naturally cooled. The metal-Cr contact surface of the obtained carbide sheet had a silver-gray color, and it was confirmed by XMA that the component of the silver-gray color was Cr.

Example 4 (When inorganic powder other than graphite powder is used) 600 g of chlorinated vinyl chloride resin powder, 200 g of B ₄ C powder with an average particle diameter of about 5 μm, and 300 g of diallyl phthalate monomer were mixed in a Henschel mixer. and mix the resulting mixture with 2
The mixture was kneaded using this roll and then formed into a film.

This film is 1mmφ with a plunger.
The round bar molded product obtained by extruding it into a round bar shape and cutting it into 100 mm pieces was set so as to be covered with powdered metal Cr having an average particle size of about 100 μm, as shown in Figure 1. Next, using the horizontal electric furnace shown in Fig. 3, the temperature was raised to 300°C at a rate of 5°C/hour in a nitrogen gas atmosphere, and further at 20°C/hour.
After raising the temperature to 1100°C, it was held at 1100°C for 3 hours, and then naturally cooled. The metal Cr contact surface of the obtained carbide sheet had a silvery gray color.
XMA confirmed that the silvery gray component was Cr.

[Brief explanation of drawings]

FIG. 1 shows the round rod-shaped molded product of Example 1 covered with stainless steel powder and set in a stainless steel box. In the figure, 1: Stainless steel box, 2: SUS-302
Stainless steel powder, 3: Round rod-shaped molded product, FIG. 2 shows the film-shaped molded product in Example 2 set on a stainless steel plate. In the figure, 4: SUS-302 stainless steel plate, 5:
FIG. 3 is a schematic diagram of an apparatus for metal coating and carbonization firing. In the figure, 6: Sample, 7: Horizontal tubular furnace, 8: Graphite heat insulating material, 9: 4N-NaOH aqueous solution, Figure 4 is a photograph in place of a drawing, a is a cross section of the round bar of Example 1, and b is Cr distribution state, c is a photograph taken by an X-ray microanalyzer of Fe distribution state. d: Confirmation diagram that b is Cr, e: c is
Diagram confirming that it is Fe.

Claims (1)

[Claims] 1. Molding a compound partially or entirely made of chlorine-containing resin into an appropriate shape, and molding the resulting molded body with metal.
In the process of bringing the molded body into contact with a metal containing Cr or Cr-Fe and carbonizing the molded body by heating and raising the temperature in an inert atmosphere, the metal contact surface of the molded body is exposed to Cr,
Alternatively, a method of metal coating a carbonide, characterized by coating with Cr-Fe to a thickness of about several μm. 2. The molded article contains at least 20% by weight of chlorine-containing resin.
A method for metal coating a carbonized material according to claim 1. 3. The method of metal coating a carbonized material according to claim 1, wherein the molded body is a mixture of a chlorine-containing resin and an organic polymer compound compatible therewith, or an initial condensate thereof. 4. The method for metal coating a carbonized product according to claim 1, wherein the molded body is a mixture of a chlorine-containing resin and an inorganic filler such as graphite or ceramics. 5. The method of metal coating a carbonized material according to claim 1, wherein the heating temperature in the carbonization is a temperature up to the melting point of the metal to be coated.