Self-lubricating heat-resistnat and wear-resistant materials

Abstract

The invention opened a heat-proof and wearing self-lubricating material. It can be used to the shafting bearing, bearing bush, axile bush and the other break-away friction parts of the metallurgy, mining area and machine, especially for the parts of the high temperature (350 DEG C-800 DEG C).the weight ration of the composition is C 2.6-3.%, S 0.35-0.49%, Si 0.5-1.0%, Cr 18-35%, Mo 0.8-1.5%, Cu 0.8-1.2%, Al 1.5-5.0%, V 0.1-0.25%, B 0.05-0.15%, RE 0.008-0.08%, P<=0.3%, Ni<=0.3%, Mn<=0.3%, the residue is Fe. The weight ratio of Cr / C is 5.5-10. The material has the good resistance to heat and wearing character, also it can resist the corrosion of the CO2 and SO2.

Description

technical field [0001] The invention belongs to the field of metal self-lubricating materials. The self-lubricating materials are suitable for manufacturing bearings, bearing bushes, bushings and other types of sliding friction parts in the fields of metallurgy, mining, machinery, etc., and are especially suitable for manufacturing under high temperature conditions (350°C- 800℃) heat-resistant wear-resistant self-lubricating materials used in service parts. Background technique [0002] The service life of industrial components used in metallurgy, machinery, mining and other industries is often greatly affected by high temperature, heavy load, dust pollution and serious oxidation, especially when it is difficult to add some high-temperature lubricating oil (grease), and the cooling device fails And unfavorable parts for maintenance and maintenance, the wear of wear-resistant parts will directly affect the efficiency of continuous production operations and product quality. ...

AI Technical Summary

Problems solved by technology

However, since the material must be lubricated by grease lubrication, when the temperature of the working condition makes the temperature of the wear-resistant part itself reach a temperature higher than the carbonization point of the lubricating grease, the lubricating oil will be carbonized, forming a large number of carbonized particles, and the surface of the friction body is formed by the boundary (or Fluid) friction mode is changed to abrasive wear mode, and the friction coefficient increases rapidly, resulting in failure of wear parts

The bearing wear-resistant parts made of powder metallurgy materials introduced in Table 2 are suitable for use at ambient temperatures below 500 ° C. In the same use position as the current GCr15 material bearing, this type of material has self-lubricating properties (low friction coefficient) in short-term use. ), but under heavy-duty working conditions, the wear-resistant parts made of such materials will quickly increase the amount of wear, the friction gap will be excessive, and the wear-resistant parts will be crushed and failed due to uneven force; under high-temperature working conditions , MoS in wear parts made of this material 2 After the solid lubricant is precipitated, it cannot be continuously replenished, the high-temperature lubricating performance decreases, and the surface enters dry friction due to accelerated oxidation, so the service life of this type of material is short

According to another high-sulfur alloy steel introduced in relevant literature (see Table 2 for details of the main components), when it is used in the same part of the wear-resistant parts made of GCr15 material, the high-sulfur sulfide formed by itself can be used as a solid lubricant. It can significantly reduce the friction coefficient of materials, but the solid lubricating film on the surface of bearings made of this type of material is discontinuous under heavy load conditions, and the wear gap quickly exceeds the design value; when used under high temperature conditions, the surface is easily oxidized, causing friction The coefficient increases; in addition, the use of such materials to make wear-resistant parts requires large initial design tolerances and operating start-up power, which is not suitable for manufacturing precision wear-resistant bearing parts

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