KR100872206B1 - Method for manufacturing a friction member and a friction member made by the same - Google Patents

Abstract

A method for manufacturing a friction member suitable for the slipping surface and the friction member manufactured by the same are provided to not use female and male connection of the steel substrate without the opposite material(the wheel of the vehicles, disc etc) is worn by the composition is possible for the diffused junction. A method for manufacturing a friction member suitable for the slipping surface performs follows steps: a step preparing for alloying composition including 39.6~70.9 copper powder weight%, tin powder 2~8 weight%, impression graphite powder 15~25 weight%, silicidation calcium powder 2~5 weight%, 5~10 iron powder weight%, ni powder 3~7 weight%, molybdenum powder 2~5 weight% and carbon nano tube powder 0.1~0.4 weight%; a powder mixing step for alloying composition is charged in the mixer in which the agitation blade is built in and mixed, dried in drier; a molding step pressurizing the mold with the press, and compression-molds the charged alloying composition within the mold and makes the molding product of the friction material in the steel top of the substrate; and a sintering / jointing step sintered in the sintering furnace under vacuum or the inert gas atmosphere at 950~1100‹C temperature for 1~3 hours.

Description

Method for manufacturing a friction member and a friction member made by the same

The present invention relates to a method for manufacturing a friction member and a friction member made by the method, and more particularly, brake lining, disc pad, clutch used in braking devices such as automobiles, motorcycles, railway vehicles, aircraft, industrial machinery, etc. The present invention relates to a method for producing a friction member suitable for sliding surfaces such as a facing and a friction member made by the method.

Existing friction materials used in automobile brakes are made of asbestos, graphite, rubber powder, kebula pulp, metal powder, metal fiber, etc., and at least one of them is formed by phenol resin and heat treatment.

These friction materials are made of friction members such as brake linings, disk pads, clutch facings, and are then adhered by an adhesive to the steel substrate for application to drum brakes, disk brakes, clutches.

In the 90's, the use of asbestos for such friction members was regulated, and non-asbestos-based friction members have been released. These non-asbestos-based friction members have been proposed in combination with metal powder metallurgical sintered friction materials on steel substrates. .

Examples of the friction member using the metal powder sintered friction material may include a German Saab product mounted on a high speed train (KTX) operated by KORAIL Korea. This product is a sintered composite powder mixed with copper, iron, graphite, tin, silica powder, etc. It has the characteristics that the strength is maintained relatively well at high speeds. In addition to the problem of abrasion, the coupling between the friction material and the steel substrate made in Germany is not made by diffusion bonding, but by the male and female coupling method, there is a problem that the structure is complicated and the production cost is high accordingly.

The object of the present invention, which is proposed to solve the problems of the prior art, is not easily worn on its own, and does not wear the counterparts (vehicle wheels, discs, etc.) and friction at the same time to enable diffusion bonding without male and female coupling to the steel substrate. A composition of a member, a method of manufacturing a friction member therefrom, and a friction member made by the method are provided.

Friction member manufacturing method for achieving the object of the present invention is the first embodiment, copper powder 39.6 ~ 70.9% by weight, tin powder 2 ~ 8% by weight, graphite graphite powder 15 ~ 25% by weight, calcium silicate powder 2 ~ Preparing an alloy composition comprising 5 wt%, iron powder 5-10 wt%, nickel powder 3-7 wt%, molybdenum powder 2-5 wt%, and carbon nanotube powder 0.1-0.4 wt%; A powder mixing step of charging the alloy composition to a mixer having a built-in stirring blade and mixing the mixture; After mounting the steel substrate shaped as a base portion of the friction material on the lower mold of the mold corresponding to the friction material shape, and filling the dried alloy composition in the mold in which the steel substrate is mounted to combine the upper and lower molds, the mold Pressing to form a molded body of a friction material on the steel substrate by compression molding the alloy composition filled in the mold; And a sintering / bonding step of sintering at a temperature of 950 to 1100 ° C. for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 to 5 kgf / cm ² between the molded body of the friction material and the steel substrate. It features.

Friction member manufacturing method for achieving the object of the present invention is the second embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2 ~ Preparing an alloy composition comprising 5 wt%, iron powder 7-14 wt%, nickel powder 3-8 wt%, and carbon nanotube powder 0.1-0.4 wt%; A powder mixing step of charging the alloy composition to a mixer having a built-in stirring blade and mixing the mixture; After mounting the steel substrate shaped as a base portion of the friction material on the lower mold of the mold corresponding to the friction material shape, and filling the dried alloy composition in the mold in which the steel substrate is mounted to combine the upper and lower molds, the mold Pressing to form a molded body of a friction material on the steel substrate by compression molding the alloy composition filled in the mold; And a sintering / bonding step of sintering at a temperature of 950 to 1100 ° C. for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 to 5 kgf / cm ² between the molded body of the friction material and the steel substrate. It features.

Friction member manufacturing method for achieving the object of the present invention as a third embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2 ~ Preparing an alloy composition comprising 5 wt%, iron powder 10-22 wt% and carbon nanotube powder 0.1-0.4 wt%; A powder mixing step of charging the alloy composition to a mixer having a built-in stirring blade and mixing the mixture; After mounting the steel substrate shaped as a base portion of the friction material on the lower mold of the mold corresponding to the friction material shape, and filling the dried alloy composition in the mold in which the steel substrate is mounted to combine the upper and lower molds, the mold Pressing to form a molded body of a friction material on the steel substrate by compression molding the alloy composition filled in the mold; And a sintering / bonding step of sintering at a temperature of 950 to 1100 ° C. for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 to 5 kgf / cm ² between the molded body of the friction material and the steel substrate. It features.

Friction member for achieving the object of the present invention is the first embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2-5 weight It is characterized in that it is prepared by compression molding an alloy composition comprising 5 to 10% by weight, 5 to 10% by weight of nickel powder, 2 to 5% by weight of molybdenum powder and 0.1 to 0.4% by weight of carbon nanotube powder. .

Friction member for achieving the object of the present invention is a second embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2-5 weight It is characterized in that it is prepared by compression molding an alloy composition comprising 7 to 14% by weight of iron powder, 3 to 8% by weight of nickel powder and 0.1 to 0.4% by weight of carbon nanotube powder.

Friction member for achieving the object of the present invention is a third embodiment, copper powder 39.6 ~ 70.9% by weight, tin powder 2 ~ 8% by weight, graphite graphite powder 15 ~ 25% by weight, calcium silicate powder 2 ~ 5 weight It is characterized in that it is produced by compression molding an alloy composition comprising 10 to 22% by weight of iron powder and 0.1 to 0.4% by weight of carbon nanotube powder.

The friction member is charged by mixing the alloy composition into a mixer with a built-in stirring blade, and then completely dried in a dryer, and a steel substrate shaped as a base part of the friction material is mounted on the lower mold of the mold corresponding to the friction material shape. After filling the dry alloy composition in a mold in which the steel substrate is mounted and the upper and lower molds are combined, the mold is pressed by a press to compress and mold the alloy composition filled in the mold. It is produced by sintering for 1 to 3 hours at a temperature of 950 ~ 1100 ℃ in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 ~ 5kgf / cm ² between the substrates.

The present invention improves abrasion resistance, does not easily wear on its own, and minimizes aggression to counterparts, thereby improving wearability on counterparts such as wheels and disks of vehicles, and at the same time enabling diffusion bonding to steel substrates without male and female coupling. By providing a composition of a friction member and a method of manufacturing a friction member therefrom and a friction member made by this method, the service life of the friction member is extended, thereby minimizing the inconvenience of frequent replacement of the friction member. In addition, it is possible to reduce all the additional costs due to frequent replacement, and it is possible to simplify the device assembly of the friction member, thereby reducing the production cost.

Hereinafter, a method of manufacturing a friction member according to a preferred embodiment of the present invention, the friction member made by this method will be described in detail.

Method of manufacturing friction member

The method of manufacturing the friction member of the present invention uses the composition of the friction member as described above, and may be performed as the following first, second, and third embodiments.

(First embodiment)

Friction member manufacturing method according to the first embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2-5% by weight, iron powder Preparing an alloy composition comprising 5 to 10 wt%, 3 to 7 wt% nickel powder, 2 to 5 wt% molybdenum powder, and 0.1 to 0.4 wt% carbon nanotube powder; A powder mixing step of charging the alloy composition to a mixer having a built-in stirring blade and mixing the mixture; After mounting the steel substrate shaped as a base portion of the friction material on the lower mold of the mold corresponding to the friction material shape, and filling the dried alloy composition in the mold in which the steel substrate is mounted to combine the upper and lower molds, the mold Pressing to form a molded body of a friction material on the steel substrate by compression molding the alloy composition filled in the mold; And a sintering / bonding step of sintering at a temperature of 950 to 1100 ° C. for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 to 5 kgf / cm ² between the molded body of the friction material and the steel substrate.

Hereinafter, the characteristics of each additive constituting the alloy composition will be described.

The copper powder is a main component of the friction member, electrolytic copper having a particle size of 50 μm and a purity of 99.9% is used. The copper powder is combined with tin powder to form a Cu—Sn alloy to maintain the hardness and strength of the friction material. In addition, it forms a skeleton of the friction member to act to join the steel substrate and the friction material.

At this time, if the content of the copper powder is 39.6wt% or less, the hardness and strength of the friction material is lowered, and the bonding strength of the Cu-Sn alloy is lowered.

In addition, when the content is more than 70.9wt%, while increasing the bonding strength of the Cu-Sn alloy, the hardness and strength of the friction material, in particular high temperature hardness and high temperature strength is to be lowered.

The tin (Sn) powder is a powder particle size of 10㎛, 99% purity reagent grade is used, the main function is to combine with Cu powder to form a Cu-Sn alloy to maintain the hardness and strength of the friction material, the skeleton of the friction member It forms a function to combine the steel substrate and the friction material.

At this time, if the content of tin powder is 2wt% or less, the hardness and strength of the friction material is lowered, and the bonding strength of the Cu-Sn alloy is lowered.

In addition, if the content is more than 8wt%, while increasing the bonding strength of the Cu-Sn alloy, it reduces the hardness and strength of the friction material, in particular, the high temperature hardness and strength.

The impression graphite powder is used in the particle size of 200 ~ 1,000㎛, more than 97% purity, the main function is to stabilize the lubrication function of the friction material, that is, the friction coefficient and abrasion resistance, and to reduce the noise generation function during friction.

At this time, when the purity is less than 97% (fixed carbon amount), due to the problem of material change due to impurities, the sintering reaction of the friction material is inhibited.

If the content of the graphite powder is less than 15wt%, the lubrication function of the friction material is insufficient to increase the coefficient of friction to increase the noise generation rate, while the wear rate of the friction material is lowered, while increasing the wear rate of the counterpart (Rotor or Disk). do.

In addition, if the content of the graphite powder is 25wt% or more, the hardness and strength of the friction material is lowered, the friction coefficient is lowered, the noise generation rate is lowered, the wear rate of the friction material is increased, while reducing the wear rate of the counterpart material.

The calcium silicate (CaSio2) powder is used as a reagent grade of 0.5㎛ particle size, purity of 99% or more, the main functions of the lubricant (phosphorus graphite) and friction promoter (Fe, Ni, Mo) and Cu-Sn alloy composition It acts to increase wear resistance and to increase coefficient of friction.

At this time, when the content of the calcium silicate powder is 2wt% or less, the function of agglomerating friction components (lubricant, friction promoter, Cu-Sn alloy composition) is weakened, so that abrasion resistance is weakened and friction coefficient is lowered.

In addition, when the content of the calcium silicate powder is more than 50wt%, the function of aggregating the friction member is enhanced to increase the coefficient of friction and to improve abrasion resistance, but to increase the noise generation rate.

The iron (Fe) powder is a powder particle size of 50㎛, purity of 99% or more reagent grade is used, the main function is to promote high temperature hardness and strength as a friction promoter. It acts to increase the coefficient of friction.

At this time, when the content of the iron powder is 5wt% or less, the friction coefficient is lowered, the wear rate of the friction member is increased, the noise generation rate is increased, the high temperature hardness and strength is reduced.

In addition, when the iron powder content is more than 22wt% high temperature hardness and strength is increased, the friction coefficient is increased more than necessary to increase the wear rate of the counterpart.

The nickel (Ni) powder is a powder particle size of 50㎛, reagent grade of more than 99% purity, the main function is to increase the coefficient of friction as a friction promoting material, to improve the binding force of the steel substrate and friction material, and to improve the corrosion resistance of the friction material To act.

In this case, when the content of the nickel powder is 3wt% or less, the friction promoting effect is insufficient, the binding force between the steel substrate and the friction material is insufficient, and the corrosion resistance of the friction material is insufficient.

In addition, when the content of the nickel powder is more than 8wt%, the binding force between the steel substrate and the friction material increases, the corrosion resistance of the friction material is improved, but the noise generation rate is increased due to the friction coefficient increases, and the wear rate of the counterpart material is increased.

The molybdenum (Mo) powder is a powder particle size of 50㎛, the purity of more than 99% of the reagent grade, the main function is to increase the friction coefficient as a friction promoter, to enhance the hardness and strength of the high temperature, and to increase the heat resistance do.

At this time, when the content of the molybdenum powder is 2wt% or less, the friction promoting effect is insufficient, the high temperature hardness and strength is lowered, the heat resistance is lowered.

In addition, when the content of the molybdenum powder is 5wt% or more, the amount of wear of the counterpart due to the increase of the friction coefficient is increased, the noise generation rate is increased, the high temperature hardness and strength is increased, and the heat resistance is increased.

The carbon nanotube (CNT) powder uses a reagent particle size of 10㎛, purity more than 99%, the main function is to improve the heat resistance of the friction material by thermal conductivity and thermal stability, to prevent the friction performance degradation due to friction heat, high temperature It works to increase strength.

At this time, when the content of the carbon nanotube is 0.1wt% or less, the thermal stability is insufficient, the heat resistance is deteriorated, the thermal conductivity is insufficient, and the performance deterioration by the frictional heat occurs.

In addition, when the content of carbon nanotubes is 0.4wt% or more, the sintering reactivity of the alloy is suppressed, and the high temperature strength and the friction coefficient are reduced.

The powder mixing step will be described below.

The alloy compositions were weighed according to a predetermined blending ratio, charged into a mixer with a built-in stirring blade, charged with a predetermined amount of normal hexane with a certain amount of paraffin wax and mixing accelerator, and then rotated in a dryer for 50 minutes, and then transferred to a dryer. Heating to a temperature of ˜60 ° C., followed by volatilization of normal hexane to complete drying.

The molding step is described below.

The mold is pressurized to a pressure of 1 to 3 ton / cm ² by a press. When the molding pressure is 1 ton / cm ² or less, the green density of the compression molded body is lowered and the strength of the compression molded body is too low, and 3 ton If / cm ² or more, the hardness of the compression molded article is increased by the labor, the structure of the compression molded article is unstable and cracks are easily generated inside / outside.

After the molding step is completed, the sintering / bonding process for the molded body of the friction material placed on the steel substrate is performed.

Referring to the sintering / bonding step as follows.

In order to promote the bonding between the steel substrate and the molded article of the friction material, a pressure of 2 to 5 kgf / cm ² is applied between the molded body of the friction material and the steel substrate, at a temperature of 1 to 3 at a temperature of 950 to 1100 ° C. in a sintering furnace under a vacuum or inert gas atmosphere. Sinter for time.

As a result, the sintering treatment of the molded body of the friction material and the joining process between the sintered friction material molded body and the steel substrate are completed.

Here, when the sintering temperature is 950 ° C. or less, the compacted compact of the compressed friction material is unstablely sintered, the alloy structure becomes unstable, breaks well, bubbles are generated therein, and when the temperature is 1100 ° C. or more, the friction material The alloy structure of the molded article is excessively sintered, the hardness of the molded article is lowered, a nonuniform structure appears in the molded article, and the friction coefficient of the molded article is lowered.

In addition, when the sintering time is 1 hour or less, the alloy structure of the molded body is not sintered properly, the hardness of the molded body is lowered, the friction coefficient is also lowered, and if it is 3 hours or more, the alloy structure of the molded body is excessively sintered, Uneven structure appears in the molded body, and the coefficient of friction of the molded body is lowered.

In addition, when the pressure between the molded body of the friction material and the steel substrate is 2 kgf / cm ² or less, the bonding force between the molded body of the friction material and the steel substrate becomes unstable, and when 5 kgf / cm ² or more, a large pressure is applied before the sintering reaction to the molded body sufficiently occurs. Cracks are generated in the compacts that are applied to the compacts and compressed.

Optionally, after the sintering and joining process, the friction member to which the sintered friction material is bonded to the steel substrate may be resintered by hot iso-static pressing. At this time, the working conditions are neon gas or argon gas pressure 900 ~ 1200 atm, temperature 700 ~ 900 ℃, compression time is 60 ~ 90 minutes.

The reason for the resintering process is that the friction material, which is sintered and alloyed in the whole process, increases the alloy density, the alloy structure is dense, and the mechanical / physical properties are improved, and the liquid bonding between the alloyed friction material and the steel substrate is induced. Bonding is done rigidly.

Here, when the gas pressure is 900 atm or less, sufficient compression does not occur in the sintered friction material, and the resintering treatment effect is insufficient. When the gas pressure is 1200 atm or more, the shape and characteristics of the sintered friction material change.

If the temperature in the hot anticompressor is 700 ° C. or lower, no compression occurs in the solid friction material, and if it is 900 ° C. or higher Particle growth of the alloy structure of the friction material occurs to change the properties of the friction material.

In addition, when the compression time is 60 minutes or less, the liquid phase movement does not sufficiently occur inside the alloy of the friction material, and the resintering treatment effect is insufficient. If the compression time is 90 minutes or more, the characteristic change of the friction material occurs due to grain growth of the alloy structure of the friction material.

Second Embodiment

In the method of manufacturing the friction member of the present invention according to the second embodiment, the molding step and the sintering / bonding step of the first embodiment are made in the same manner, except that the composition of the friction member in the powder mixing step is different.

Thus, description of the entire manufacturing process will be omitted, and only the powder mixing step will be described.

Powder mixing step according to the second embodiment is 40 to 78% by weight of copper powder, 10 to 25% by weight of iron powder, 1 to 8% by weight of tin powder, 9 ~ 20% by weight of graphite graphite powder, 0.1 to 2 carbon nanotube powder Charge the alloy composition containing the weight percent and 1 to 5% by weight of calcium silicate powder into the mixer with a built-in stirring blade, and after charging a certain amount of normal hexane with a certain amount of paraffin wax and mixing accelerator, the mixer for 50 minutes After the rotation, transfer to a dryer and heated to a temperature of 50 ~ 60 ℃ includes the step of completely drying the hexane to remove the hexane.

(Third Embodiment)

In the method of manufacturing the friction member of the present invention according to the third embodiment, the molding step and the sintering / bonding step of the first embodiment are made in the same manner, except that the composition of the friction member in the powder mixing step is different.

Thus, description of the entire manufacturing process will be omitted, and only the powder mixing step will be described.

In the powder mixing step according to the third embodiment, copper powder 35 to 78% by weight, iron powder 10 to 25% by weight, tin powder 1 to 8% by weight, graphite graphite powder 9 to 20% by weight, carbon nanotube powder 0.1 to 2 Alloy compositions comprising wt%, calcium silicate powder 1-5% and silica powder 0.5-5% by weight are charged in a mixer with a built-in stirring blade, and a certain amount of normal hexane is added together with a certain amount of paraffin wax and a mixing accelerator. After charging, the mixture was rotated for 50 minutes, then transferred to a dryer and heated to a temperature of 50-60 ° C. to remove volatilized normal hexanes, followed by complete drying.

Friction member

The friction member of the present invention uses a method of manufacturing the friction member as described above, and may be made as the following first, second, and third embodiments.

(First embodiment)

Friction member of the present invention according to the first embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2-5% by weight, iron powder It is prepared by compression molding an alloy composition comprising 5 to 10% by weight, 3 to 7% by weight of nickel powder, 2 to 5% by weight of molybdenum powder, and 0.1 to 0.4% by weight of carbon nanotube powder.

Here, when the compression molding process is described in detail, the alloy composition is charged into a mixer with a built-in stirring blade, mixed, and then completely dried in a dryer, and the base of the shape of the friction material is formed on the lower mold of the mold corresponding to the shape of the friction material. After mounting a steel substrate shaped as a part, and filling the dried alloy composition into a mold in which the steel substrate is mounted and the upper and lower molds are combined, the mold is pressed by a press to fill the mold with the alloy composition. It is produced by sintering at a temperature of 950 ~ 1100 ℃ for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere, while applying a pressure of 2 ~ 5kgf / cm ² between the molded product made by compression molding and the steel substrate.

At this time, normal hexane is charged together with the alloy composition and a predetermined amount of paraffin wax and a mixing accelerator, and then mixed with a mixer having a built-in stirring blade, rotated for 50 minutes, and then transferred to a dryer and heated to a temperature of 50 to 60 ° C. to remove volatilized normal hexane. To dry completely.

And, the molded body is to be produced at a molding pressure of 1 ton / cm ² to 3 ton / cm ² .

Then, the friction member to which the sintered friction material is bonded to the steel substrate to be re-sintered in the hot-air compressor.

(2nd Example)

Friction member of the present invention according to the second embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2-5% by weight, iron powder It is prepared by compression molding an alloy composition comprising 7 to 14% by weight, 3 to 8% by weight of nickel powder and 0.1 to 0.4% by weight of carbon nanotube powder.

At this time, the compression molding process of the alloy composition is made in the same process as the first embodiment.

(Third Embodiment)

Friction member of the present invention according to the third embodiment, copper powder 39.6-70.9% by weight, tin powder 2-8% by weight, graphite graphite powder 15-25% by weight, calcium silicate powder 2-5% by weight, iron powder It is prepared by compression molding an alloy composition comprising 10 to 22% by weight and carbon nanotube powder 0.1 to 0.4% by weight.

At this time, the compression molding process of the alloy composition is made in the same process as the first embodiment.

Abrasion Test for Friction Members

Using the friction member specimens (20mm * 50mm * 10mm) manufactured through the first, second, and third embodiments, the following test results could be derived.

First, in a lathe capable of selectively fixing the specimens and rotating at 1800 rpm using a caststeel brake drum disc as a counterpart, the friction material specimen and the counterpart are mounted in surface contact with each other. The counterpart was rotated at 1800 rpm and the friction specimen was set to take a load of 20 kgf / cm 2. And the load on the friction material specimen was operated until the counterpart material stopped.

In addition, a friction material made by Saab, Germany, which is employed in a high-speed train operated by KORAIL, Korea, was tested on the same test apparatus and under the same conditions using a friction material specimen of a conventional example.

The test results are shown in Table 1 below.

Sample Coefficient of friction Weight change Counterpart Hardness (Amount of Wear of Relative Material) Bonding between steel substrate and friction material Example 1 0.83 3.4 g 1.7 g U Example 2 0.66 2.8 g 1.5 g U Example 3 1.16 4.9 g 2.2 g U Friction material made by Saab, Germany 1.08 4.35 g 19.3 g Only male and female coupling possible without bonding

As can be seen in Table 1, Example 1 has a lower friction coefficient than the conventional example, but the braking effect is lower, but the friction coefficient of the friction material is generally allowed at 0.5 to 1.5, and therefore, may be used as a friction material. The weight change is small and the aggressiveness against the counterpart is low, so that it can be used for a long time without damaging the counterpart than the conventional friction material, and the friction material can be maintained at high strength with the steel substrate.

In addition, the second embodiment has a lower friction coefficient than the conventional example, but the braking effect is lower as in the first embodiment, but the friction coefficient of the friction material is generally used at 0.5 to 1.5, so that it can be used as a friction material. This small and low aggressiveness to the counterpart material can be used for the longest time without damaging the counterpart material than the conventional friction material, and the friction material can be held and bonded to the steel substrate at high strength.

In addition, the third embodiment has a higher friction coefficient than the conventional example, and the braking effect is superior to that of the conventional example. However, the weight change amount is higher than that of the first and second embodiments, and the attack to the counterpart is also high. However, when compared with the conventional friction material, the aggressiveness against the counterpart material is much lower, so that it can be an excellent friction material from the viewpoint of damaging the counterpart material less than the conventional friction material, and the friction material can be maintained at high strength with the steel substrate. have.

1 is a graph comparing abrasion resistance of a friction member test piece manufactured as a second embodiment of the present invention and a conventional friction member test piece, and showing a change in thickness of the test piece, the thickness of the conventional friction member test piece as a measurement order progresses. In contrast, the friction member test specimen of the present invention can be seen that the change in thickness is very small.

Figure 2 is a graph comparing the wear resistance of the friction member test specimen prepared as a second embodiment of the present invention and the conventional friction member test piece showing the change in weight of the test piece, the test results show that the weight change of the conventional friction member test piece is much higher It can be seen that the wear of the specimen was severe.

FIG. 3 is a graph comparing the aggression of the friction material test specimen and the friction material test specimen prepared as the second embodiment of the present invention, showing the wear amount of the counterpart material, the wear amount of the counterpart material by the conventional friction member test piece 20g On the other hand, the wear amount of the counterpart material by the friction member test piece of the present invention is only about 1.5g.

Such a friction member of the present invention has the advantage of extending the life of the entire braking device.

Figure 4 is a graph comparing the noise measurement and the friction member test specimen prepared as a second embodiment of the present invention and the conventional friction member, it can be seen that the results of the friction member test piece of the present invention in terms of noise generation is excellent. have.

1 is a graph comparing the wear resistance of a friction member test piece prepared as a second embodiment of the present invention and a conventional friction member test piece.

Figure 2 is a graph comparing the wear resistance of the friction member test specimen and the friction member test specimen prepared as a second embodiment of the present invention.

Figure 3 is a graph comparing the relative material aggressiveness of the friction member test piece prepared as the second embodiment of the present invention and the conventional friction member test piece.

Figure 4 is a graph comparing the noise measurement and the friction member test specimen and the friction member test specimen prepared as a second embodiment of the present invention.

Claims (14)

Copper powder 39.6 ~ 70.9% by weight, Tin powder 2 ~ 8% by weight, impression graphite powder 15 ~ 25% by weight, calcium silicate powder 2-5% by weight, iron powder 5-10% by weight, nickel powder 3-7% by weight Preparing an alloy composition comprising 2 to 5 wt% molybdenum powder and 0.1 to 0.4 wt% carbon nanotube powder; A powder mixing step of charging the alloy composition to a mixer having a built-in stirring blade and mixing the mixture; After mounting the steel substrate shaped as a base portion of the friction material on the lower mold of the mold corresponding to the friction material shape, and filling the dried alloy composition in the mold in which the steel substrate is mounted to combine the upper and lower molds, the mold Pressing to form a molded body of a friction material on the steel substrate by compression molding the alloy composition filled in the mold; And And a sintering / bonding step of sintering at a temperature of 950 to 1100 ° C. for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 to 5 kgf / cm ² between the molded body of the friction material and the steel substrate. Friction member manufacturing method. Copper powder 39.6 ~ 70.9% by weight, Tin powder 2 ~ 8% by weight, impression graphite powder 15 ~ 25% by weight, calcium silicate powder 2-5% by weight, iron powder 7-14% by weight, nickel powder 3-8% by weight And preparing an alloy composition comprising 0.1 wt% to 0.4 wt% of carbon nanotube powder; A powder mixing step of charging the alloy composition to a mixer having a built-in stirring blade and mixing the mixture; After mounting the steel substrate shaped as a base portion of the friction material on the lower mold of the mold corresponding to the friction material shape, and filling the dried alloy composition in the mold in which the steel substrate is mounted to combine the upper and lower molds, the mold Pressing to form a molded body of a friction material on the steel substrate by compression molding the alloy composition filled in the mold; And And a sintering / bonding step of sintering at a temperature of 950 to 1100 ° C. for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 to 5 kgf / cm ² between the molded body of the friction material and the steel substrate. Friction member manufacturing method. Copper powder 39.6 ~ 70.9 wt%, Tin powder 2 ~ 8 wt%, Impression graphite powder 15 ~ 25 wt%, Calcium silicide powder 2 ~ 5 wt%, Iron powder 10 ~ 22 wt% and Carbon nanotube powder 0.1 ~ 0.4 Preparing an alloy composition comprising a weight percent; A powder mixing step of charging the alloy composition to a mixer having a built-in stirring blade and mixing the mixture; After mounting the steel substrate shaped as a base portion of the friction material on the lower mold of the mold corresponding to the friction material shape, and filling the dried alloy composition in the mold in which the steel substrate is mounted to combine the upper and lower molds, the mold Pressing to form a molded body of a friction material on the steel substrate by compression molding the alloy composition filled in the mold; And And a sintering / bonding step of sintering at a temperature of 950 to 1100 ° C. for 1 to 3 hours in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 2 to 5 kgf / cm ² between the molded body of the friction material and the steel substrate. Friction member manufacturing method. The method according to any one of claims 1 to 3, In the powder mixing step, normal hexane is charged together with an alloy composition, a predetermined amount of paraffin wax, and a mixing accelerator, charged together with a mixer equipped with a stirring blade, rotated for 50 minutes, transferred to a dryer, and heated to a temperature of 50 to 60 ° C. to normal hexane. Method for producing a friction member, characterized in that to remove completely by volatilization. The method according to any one of claims 1 to 3, The forming step is a friction member manufacturing method, characterized in that for maintaining the molding pressure 1 ton / cm ² to 3 ton / cm ² . The method according to any one of claims 1 to 3, The impression graphite powder is an artificial graphite powder having a particle size of 200 ~ 1,000㎛, the purity member is a friction member manufacturing method, characterized in that more than 95% by weight. The method according to any one of claims 1 to 3, After the sintering / bonding step, further comprising the step of re-sintering the friction member bonded to the sintered friction material on the steel substrate in a hot anticompressor, wherein the neon gas or argon gas pressure is 900 ~ 1200 atm And a temperature of 700 to 900 ° C. and a compression time of 60 to 90 minutes. Copper powder 39.6 ~ 70.9% by weight, Tin powder 2 ~ 8% by weight, impression graphite powder 15 ~ 25% by weight, calcium silicate powder 2-5% by weight, iron powder 5-10% by weight, nickel powder 3-7% by weight It is prepared by compression molding an alloy composition comprising 2 to 5% by weight of molybdenum powder and 0.1 to 0.4% by weight of carbon nanotube powder, The alloy composition was charged into a mixer with a built-in stirring blade, mixed, and completely dried in a dryer, and a steel substrate formed as a base portion of a friction material was mounted on a lower mold of a mold corresponding to the friction material shape. After the substrate is filled and filled with the dried alloy composition in a mold in which an upper and lower molds are combined, the mold is pressed by a press to compress the molded alloy composition in the mold, and between the molded body and the steel substrate 2 to 2. Friction member, characterized in that produced by sintering for 1 to 3 hours at a temperature of 950 ~ 1100 ℃ in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 5kgf / cm ² . Copper powder 39.6 ~ 70.9% by weight, Tin powder 2 ~ 8% by weight, impression graphite powder 15 ~ 25% by weight, calcium silicate powder 2-5% by weight, iron powder 7-14% by weight, nickel powder 3-8% by weight And it is prepared by compression molding an alloy composition comprising 0.1 to 0.4% by weight of carbon nanotube powder, The alloy composition was charged into a mixer with a built-in stirring blade, mixed, and completely dried in a dryer, and a steel substrate formed as a base portion of a friction material was mounted on a lower mold of a mold corresponding to the friction material shape. After the substrate is filled and filled with the dried alloy composition in a mold in which an upper and lower molds are combined, the mold is pressed by a press to compress the molded alloy composition in the mold, and between the molded body and the steel substrate 2 to 2. Friction member, characterized in that produced by sintering for 1 to 3 hours at a temperature of 950 ~ 1100 ℃ in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 5kgf / cm ² . Copper powder 39.6 ~ 70.9 wt%, Tin powder 2 ~ 8 wt%, Impression graphite powder 15 ~ 25 wt%, Calcium silicide powder 2 ~ 5 wt%, Iron powder 10 ~ 22 wt% and Carbon nanotube powder 0.1 ~ 0.4 In the friction member manufactured by compression molding an alloy composition comprising a weight%, The alloy composition was charged into a mixer with a built-in stirring blade, mixed, and completely dried in a dryer, and a steel substrate formed as a base portion of a friction material was mounted on a lower mold of a mold corresponding to the friction material shape. After the substrate is filled and filled with the dried alloy composition in a mold in which an upper and lower molds are combined, the mold is pressed by a press to compress the molded alloy composition in the mold, and between the molded body and the steel substrate 2 to 2. Friction member, characterized in that produced by sintering for 1 to 3 hours at a temperature of 950 ~ 1100 ℃ in a sintering furnace under a vacuum or inert gas atmosphere while applying a pressure of 5kgf / cm ² . delete The method according to any one of claims 8 to 10, Charge the normal hexane together with a mixer with a built-in stirring blade with the alloy composition and a predetermined amount of paraffin wax and mixing accelerator, rotate for 50 minutes, transfer to a dryer and heat to a temperature of 50 ~ 60 ℃ to completely remove the normal hexane Friction member, characterized in that for drying. The method according to any one of claims 8 to 10, Friction member, characterized in that the molded body is produced at a molding pressure of 1 ton / cm ² to 3 ton / cm ² . The method according to any one of claims 8 to 10, And a sintering treatment of the friction member to which the sintered friction material is bonded to the steel substrate in a hot anticompressor.

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