JPS589152B2 - Katoyouchiyaku code - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to flexible cords, and more particularly to flexible cords for forming coatings on parts as a result of melting.

A spray-card of the type having an inner core consisting essentially of an inorganic powder and an organic sheath surrounding the core is disclosed in a Japanese patent application filed on March 12, 1971. It has already been disclosed in No. 13657/1983.

The spray cord is characterized in that the core contains a low proportion of inorganic compounds capable of maintaining the agglomeration of the powder particles at the combustion temperature of the organic binder until complete melting of the powder particles.

This type of spray cord makes it possible to form a coating on the surface of a metal part by spraying with the torch of a spray gun.

The core of this spray cord consists essentially of an organic binder and an inorganic powder made up of the materials used to form the coating.

In short, the materials used to form the coating have particle diameters of 50 to 150 microns, more commonly 5 to 500 microns.
It is in the form of a powder in the micron range.

The agglomeration of these particles until their melting is achieved is maintained by adding an inorganic compound to the core of the spray cord.

However, as the melting point of the material to be applied as a coating increases, the effect of the addition becomes incomplete.

Also, in many cases it is actually advantageous to form a coating on a component using a refractory material having a large particle size.

This is especially the case when it is desired to obtain a coating with high friction properties or when it is desired to impart high wear resistance to coated parts.

However, it is not possible to spray refractory materials with large grain sizes using techniques such as those described above, and one must rely on welding techniques to do so.

By making some modifications to the spray codes disclosed in the prior patent application, we have developed a dense, highly adherent coating of the material that makes up the core, based on the nature and particle size of the material. It was discovered that it is possible to form the structure regardless of the

The object of the invention is to provide an improved flexible cord which in all cases maintains a good agglomeration of the powder particles achieving a core and which allows the formation of a coating by welding or melting.

The welding cord according to the invention is characterized in that the organic sheath has a low proportion of inorganic compounds, for example less than 20 parts, so that the agglomeration of particles in the core at the combustion temperature of the organic part is significantly improved. It is a unique feature.

Another feature of the welded cord of the present invention is that the addition of an inorganic compound to the exterior portion maintains the agglomeration of partially non-meltable refractory particles until the fusible portion melts. The purpose is to make it possible to incorporate particles into the internal part.

In one preferred embodiment, the inorganic compound capable of maintaining the agglomeration of the particles constituting the core at combustion temperatures is a silicate, preferably sodium silicate.

The refractory material is preferably a carbide, but may also be a nitride or a boride.

Alternatively, tungsten carbide may be used.

Furthermore, the fusible material is preferably made based on nickel, cobalt or iron.

The refractory particles have at least two different particle sizes.

Furthermore, the core preferably comprises an inorganic compound comprising glass fibers.

A more complete understanding of the invention may be obtained from the following description of some embodiments of flexible cords according to the invention.

As already mentioned, the welding cord of the present invention has two parts:
That is, it is composed of a flexible core portion and a flexible peripheral exterior portion.

The sheath is composed of an organic material whose action is enhanced by the addition of inorganic materials such as silicates.

The core of the cord body contains, on the one hand, particles of a refractory substance and particles of an accessible metal alloy, and, on the other hand, an organic binder in which all said particles constituting the inorganic material are embedded. There is.

Preferably, the particles of refractory material have two or three different values of particle size.

This means that, on the one hand, large particle sizes, e.g. 3 mm
It has particles with a diameter of the order of magnitude, which makes it possible to adjust the density of the refractory particles.

This is because the interspace between particles of large diameter is mostly filled by particles of small diameter.

Furthermore, particles of the metal alloy constituting the fusible matrix are also intercalated between the particles of the refractory material.

In this way, the core is very well filled with active material and a very small amount of binder.

In order to increase the cohesive strength of the particles of the cord, it is also possible to strengthen the core of the cord with glass fibers instead of an organic binder.

The special arrangement described above makes it possible to intimately adhere the refractory material constituting the core to the surface of the component on which the coating is to be applied.

In practice, the small-sized refractory particles are packed into the spaces left by the large-diameter particles on the component surface.

The flexible matrix is preferably made of nickel, cobalt, iron or an alloy of these different metals.

Regarding refractory particles, they can be carbides, nitrides or borides.

However, tungsten carbide is particularly preferred.

Several embodiments of making flexible cords in accordance with the present invention will now be described.

These examples are not intended to be interpreted in any limiting sense; they are merely intended to provide a practical method of manufacturing the flexible cord of the present invention.

Example 1 Calcium zirconate flexible cord: The core is composed of the following materials: - Calcium zirconate powder 50-200 microns...100 parts (by weight) Calcium monophosphate...4 Parts (by weight) of monohydroxy ethyl cellulose...6 parts (by weight) The exterior part is formed by the same organic binder with the addition of 8 parts of sodium silicate.

Example 2 The core has the following composition: -Nickel-chromium-boron-silicon alloy...10
0 parts (weight) Tungsten monocarbide (diameter 2)...200 parts (
Weight) - Tungsten carbide (diameter 0.8mm)...5
0 parts (weight) - Tungsten carbide (diameter 0.3 mm) 50 parts (weight) - Glass fiber...4 parts (weight) - Binding material...10 parts (weight) The exterior part is Formed by an organic binder added with 10% sodium silicate.

Said bonding material is made by the method described in said patent application.

The bonding material used for the sheath may preferably be of the same nature as the bonding material used to form the core.

Restating one method of manufacturing the organic binder, 20 liters of hot water and 6 kg of hydroxy ethyl methylcellulose are mixed separately in a paddle mixer to make an organic sheathing paste.

After approximately 45 minutes of mixing, when the jelly-like material is considered completely homogenized, 3 kg of pure glycerin are added, optionally with a small amount of organic colorant.

Mixing is then continued for an additional 15 minutes and the resulting paste is left in a closed container for a minimum of 48 hours before being packed into cylinders as an inorganic paste.

Example 3 The same casing as above is used.

The core has the following composition.

-Cobalt, chromium, boron, silicon alloy...14
0 parts (weight) - Titanium boride (diameter 3 mm)...200 parts (weight) - Titanium boride (diameter 1 mm)...80 parts (weight) - Glass fiber... ...2 parts (by weight) -Binding material...10 parts (by weight) Example 4 The exterior part described in Example 1 is again employed.

The core is composed of the following materials: -Cast chromium/iron alloy...150 parts (weight)-
Chromium carbide (diameter 1.5 mm) 200 parts (
Weight) - Chromium carbide) diameter 0.3 mm)...100 parts (weight) - Glass fiber...4 parts (weight) - Binding material...10 parts (weight) The flexible welding cord described above can be used with a flame blowing torch or T
It can be used to assemble parts using an electric arc using IG or MIG methods.

From a practical working point of view, the flexible cord can be guided close to the melting zone by sliding within a stationary metal sleeve.

This allows continuous and automatic work planning.

Furthermore, French Patent No. 69 of August 28, 1969
As disclosed in No. 29483 (Publication No. 2056072), the flexible cord can preferably have one or more conductive wires disposed in the core, either within the sheath or outside the sheath.

These wires can be straight or spiral.

During welding, a knife is installed that is used to cut away the sheath, or a brush is installed that ensures electrical contact to the flexible cord as it is fed into the welding torch. .

Claims (1)

[Claims] 1. A core consisting essentially of a mixture of refractory material particles and fusible metal alloy particles and a filmogenic organic binder, and an organic sheath surrounding the core. and in which the core portion contains an inorganic compound, the inorganic compound capable of maintaining the agglomeration of the substance constituting the core portion at the combustion temperature of the cord is added to the organic sheathing portion. A flexible welding cord characterized in that it has.