JPS6018622B2 - Carbonaceous sliding material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon-efficient super-dynamic vehicle with excellent load carrying capacity and wear resistance.

The general manufacturing method of carbonaceous sliding material is as follows.

An organic binder such as tar or pitch is added to carbonaceous raw material powder such as coke, graphite, or carbon black, and the mixture is heated to a temperature higher than the melting temperature of the binder. This mixture is either extruded as is or cooled, pulverized and pressure molded, and then calcined in a non-oxidizing atmosphere at a temperature of about 800 to 1.200 oo. If necessary, this baked product
Graphitization by treatment at 0°C has also been carried out. In addition, tar and pitch are also impregnated into fired products and graphitized products. Furthermore, impregnation with tar, pitch, and various resins is performed to improve the strength of the carbonaceous bedding material, improve airtightness, and make it impermeable. The carbonaceous sliding material obtained in this way takes advantage of its features such as good lubricity, low coefficient of friction, non-seizure, and good chemical resistance, and is used in various applications such as sea bream sealing parts, bearings, etc. It is used in a wide variety of applications, including packing, blower blades, and vacuum pump blades. However, in recent years, usage conditions have become increasingly severe, and there are now fields in which carbonaceous sliding materials manufactured by the conventional method as described above cannot be used due to insufficient load resistance, heat resistance, abrasion resistance, etc. For example, shaft sealing material for auto-crepe rope shaving machines under high temperature and high pressure, sealing material for high temperature and high pressure fluid transport pumps, shaft sealing material for nuclear equipment that requires high reliability, and vane material for high speed vane pumps. etc.

The object of the present invention is to obtain a high-quality carbon-free sliding material that can be used in the above-mentioned applications where conventional carbon sliding materials cannot withstand use.

The present invention relates to a carbonaceous sliding material to which an inorganic filler containing a compound of a rare earth element and/or a mineral of a rare earth element is added. Conventional technology has low coefficient of friction as the characteristics of sliding materials.
Previously, evaluations were made from the viewpoint of the stability of the coefficient of friction, but in the present invention, we evaluated the characteristics from practical aspects such as load resistance, heat resistance, wear resistance, and surface roughness of the sliding village. confirmed.

As described above, the present invention can achieve the intended purpose by adding the following inorganic filler to the carbonaceous swamp material in order to improve load resistance, heat resistance, and abrasion resistance. .

The inorganic filler of the present invention necessarily contains a compound of a rare earth element and/or a mineral of a rare earth element, the main components of which are fluorides, citrates, and phosphates of rare earth elements. By adding it, it has better load bearing capacity, heat resistance,
Abrasion resistance can be improved. Because rare elements have similar properties, it is difficult to separate them in pure form, so the rare elements mentioned here include cerium as the main component, and other rare earth elements such as lanthanum, yttrium, praseodymium, neodymium, and gadolinium. Including simple elements and mixtures thereof. Examples of materials used include cerium fluoride with a purity of 95% or more, arc carbon of various purity, cerium fluoride of steel additive grade, ceriumite, aragonite, melanocerite, cariocerite, mosandrite, ferrite, There are key compounds of rare elements such as lincolite and monazite, citrate, and phosphate minerals. In the present invention, Japanese Patent Publication No. 52-32641 and Samurai Seki Sho 4
It is of course possible to use inorganic fillers as conventionally used solid lubricants such as those shown in No. 9-44013, such as molybdenum disulfide, tungsten disulfide, talc, sericite, and graphite fluoride. During the usual production of carbonaceous alcoholic materials, carbonaceous raw material powder such as graphite, coke, and carbon black is mixed in a predetermined amount with organic binders such as tar and pitch for 100 to 300 hours. The carbonaceous sliding material is melted at a temperature of 0 and then cooled, crushed, molded, and fired to produce a carbonaceous sliding material.

The amount of the inorganic filler added is preferably 2 to 20% by weight, but more preferably 30 to 1% by weight, based on the total amount of the carbonaceous raw material powder and the organic binder.

If it is too small, the addition has no effect, and if it is too large, the wear resistance deteriorates. The particle size is suitably between 150 microns and sap microns. The present invention will be explained below with reference to Examples.

Example 1 Carbon rack was blended with 4% by weight of graphitized artificial graphite and 4% by weight of pitch (La) by weight of tar, 5% by weight of ground mosandrite was added to the total amount of this blend, and 20% by weight of ground mosandrite was added. The mixture was heated and concentrated at 0 for 4 hours.

After cooling, the striped material was pulverized to a size of 100 mesh or less, and then pressure molded at a pressure of 1.500 k3/m. This molded body was buried in graphite powder so as not to be oxidized, and then fired in sintering nitrogen. The maximum firing temperature was 900°C. Example 2 Carbon black was blended in the proportions of graphitized artificial graphite 6, 25% by weight of pitch, and 15% by weight of tar, and 5% by weight of an inorganic filler having the following composition based on the total amount of the blend. The mixture was added and held for 4 hours at 200:00.

Molding and firing were carried out in the same manner as in Example 1, except that the weight percent of Johnstrupite 5 was less than the weight percent of Mosandrite 5.

Example 3 The proportions of soot-based carbon powder 3 by weight, pitch coke-based artificial graphite 3 by weight, pitch 2 by weight, and tar 2 by weight are blended, and an inorganic filler having the following composition is blended as described above. It was added in an amount of 8% by weight based on the total amount of the product and then melted.

Cerium fluoride (purity 75%) 5% by weight Fluorite 20% by weight Calcined vermiculite 3% by weight or less Molding and firing were carried out in the same manner as in Example 1.

Example 4 The fired product obtained in Example 3 was placed in a vacuum pot and placed on the 250q01 side H.
After degassing at g for 2 hours, molten pitch was injected and
Pressure was applied for an hour.

When it was hot, it was taken out of the pot, the adhering pitch was scraped off, and it was cooled. The fired product impregnated with pitch was fired again in the firing kettle. Pitch-impregnated fired products are vacuum impregnated with furan resin and then pressurized to allow the resin to soak in thoroughly. After that, take it out from the impregnation tank, wipe off the surface resin with a solvent, and then put it in a dryer to prevent the resin from foaming. The temperature was gradually raised, and curing occurred at a maximum temperature of 1800°C. Comparative Example In Example 2, 5% by weight of waxite was used as an inorganic filler.
A fired product was obtained in the same manner.

As shown in Example 4, pitch impregnation and furan resin impregnation were performed to obtain a pitch-free carbonaceous sliding material. A comparison of the characteristics of the carbonaceous sliding material according to the present invention and a conventional carbonaceous sliding material will be described below.

The carbonaceous sliding materials manufactured in Example 4 and Comparative Example were
Assembled into a mechanical seal.

The mating material is carbide made of tungsten carbide and cobalt. Number of rotations: 20 rotations (rpm), surface pressure: 2
A mechanical seal test was conducted under the following conditions: 0k9/k, sealant: ethylene glycol, test time: 10q hours, test temperature 60pm. The test results are shown in Table 1. Table 1 Also, FIG. 1 shows an example of the surface roughness measurement results of the sliding material and the mating material in this test.

In Fig. 1, 1 is the surface roughness of the inventive product after the mechanical seal test, 2 is the surface roughness of the mechanical seal counterpart material of the present invention after the test, 3 is the surface roughness after the mechanical seal test of the comparative example, and 4 is the comparison. An example is the surface roughness of a mechanical seal mating material after testing. From these results, it can be seen that the wear resistance under high loads, which is the objective of the present invention, was significantly improved compared to conventional products. In Example 3 and Comparative Examples, pitch impregnation,
The PV limit was measured using a Matsubara friction and wear tester using the carbonaceous sliding material obtained by firing.

Sliding material dimensions: diameter 2 mm (0) x 25.6 side W) (sliding area 2), mating material FC-25 (4 types of gray cast iron), peripheral speed 1.00 rotation (rpm), atmosphere , in the atmosphere, with a load of 2
．． A test was conducted to measure the PV limit under the conditions of 5k9/uniform step and 10 minute hold. The results are shown in FIG.
In addition, in Fig. 2, 5 is the PV limit measurement result of the product of the present invention,
6 is the PV limit measurement result of the comparative example, 7 is the comparative example,
These are the PV limit measurement results excluding waxite. The PV limit of the sliding material according to the present invention is 27 (k9/ground・m/sec
) The comparative example is 17 (k9/mass/machine/sec), and the comparative example excluding wax stone is 13 (k9/enemy/skin/sec).
)Met.

As shown in FIG. 2, the friction coefficient of the sliding material according to the present invention is:
Although it is not necessarily lower than general carbon sliding materials, it has excellent load resistance.

[Brief explanation of the drawing]

Fig. 1 shows an example of the surface roughness measurement results of the test specimen and the moving surface of the mating tank in a mechanical seal test using the carbonaceous surikimura of the present invention and the conventional product, and Fig. It is a graph showing the PV limit measurement result by Matsubara type friction and wear test using a conventional product. 5 Explanation of symbols, 1...Surface roughness of the product of the present invention after the mechanical seal test, 2...Surface roughness of the counterpart material for the mechanical seal of the present invention after the test, 3...Surface after the mechanical seal test of the comparative example Roughness, 4...Surface roughness after test of comparative mechanical seal counterpart material, 5...PV limit measurement results of the product of the present invention, 06...
- PV limit measurement results of comparative example, 7... PV measurement results of comparative example excluding waxite. Figure lFigure 2

Claims (1)

[Claims] 1. A carbonaceous sliding material to which an inorganic filler containing a rare earth element compound and/or a rare earth element mineral is added.