JPH02229889A - Solid lubricant - Google Patents

Abstract

PURPOSE:To obtain a solid lubricant having abrasion resistance, heat-resistance and low friction by coating molybdenum disulfide or tungsten disulfide with glassy carbon. CONSTITUTION:(A) Particle or block of molybdenum disulfide or tungsten disulfide is mixed with (B) a thermosetting resin most preferably composed of phenolic resin, furan resin, etc., and the mixture is calcined at about 600-2000 deg.C e.g. in nitrogen atmosphere to obtain the objective solid lubricant containing the component A as a core and a glassy carbon layer firmly bonded to the outer circumference of the core. Since glassy carbon has high wettability, the present lubricant enables the compounding of molybdenum disulfide or tungsten disulfide to synthetic resin, metal, ceramics, etc., at a high compounding ratio without lowering the mechanical strength of the base matrix.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a solid lubricant having wear resistance, heat resistance, and low friction (lubricity). Targets synthetic resins, metals, ceramics, etc., as well as tangible products made from these specific shapes.

(Prior Art) It is known that a modifier such as molybdenum disulfide or tungsten disulfide is mixed with synthetic resins, metals, ceramics, etc. in order to impart low friction properties.

On the other hand, the composition of the bearing has been made to exhibit considerable wear resistance and heat resistance by mixing 50% or more of spherical glassy carbon formed by high-temperature firing of partially cross-linked phenolic resin etc. into synthetic resin. , Japanese Patent Publication No. 63-1954
This is disclosed in Publication No. 17, etc.

(Problem to be Solved by the Invention) However, in the former case, molybdenum disulfide, tungsten disulfide, etc. have poor wettability, so when mixed with synthetic resins, metals, ceramics, etc., they have poor adhesion and integrity; This resulted in a decrease in wear resistance and mechanical strength. Therefore, only small debts could be mixed.

In the latter case, the properties of glassy carbon provide excellent wear resistance and heat resistance, and while a certain level of low friction can be maintained, if a certain level of wear resistance and heat resistance can be achieved, As a material for which improvement in low friction is more important than these characteristics, it has not been possible to fully satisfy the requirements.

Focusing on the above points, the present invention is able to exhibit functionality that could not be satisfied conventionally, that is, a certain level of wear resistance and heat resistance, and at the same time, further improve low friction properties at the certain level. The purpose of the present invention is to provide a solid lubricant that can achieve the following.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a solid lubricant having a structure in which molybdenum disulfide or tungsten disulfide is coated with glassy carbon. Features.

(Function) According to the present invention, molybdenum disulfide or tungsten disulfide can be mixed with synthetic resins, metals, ceramics, etc. at high proportions without impairing mechanical strength due to the high wettability of glassy carbon. Become. On the other hand, in the process of using this solid lubricant, the glassy carbon on the surface is worn away by a load above a certain pressure, exposing part of the molybdenum disulfide or tungsten disulfide particles or lumps, so the glassy carbon becomes a solid lubricant. In addition to increasing the wear resistance and heat resistance of the material, the molybdenum disulfide or tungsten disulfide exhibits even lower friction properties.

(Example) Examples of the present invention will be described below.

Glassy carbon is optimally made of thermosetting resins such as phenolic resins and furan resins, but may also be made of epoxy resins and other thermoplastic resins, which are formed by firing them at high temperatures over time. However, by uniformly mixing the particles or lumps of molybdenum disulfide or tungsten disulfide with the resin and firing them, the particles or lumps of molybdenum disulfide or tungsten disulfide become nuclei,
The structure is such that glassy carbon is coated and bonded to the outer periphery.

The mixture itself strengthens the overall bond due to the good wettability of glassy carbon, and the molybdenum disulfide and tungsten disulfide do not impair mechanical strength.

Furthermore, even when mixed with synthetic resins, metals, ceramics, etc. at a high mixing ratio, the glassy carbon's good wettability allows it to be firmly bonded to these materials, so the mechanical strength is not impaired.

On the other hand, in the process of using this solid lubricant, the low friction properties of the glassy carbon coating the surface are exhibited under low load conditions. Under load conditions above a certain pressure corresponding to the wear resistance strength of glassy carbon, the glassy carbon on the surface wears away, exposing a portion of molybdenum disulfide or tungsten disulfide particles or lumps, resulting in low friction performance. is exhibited, significantly improving lubricity and at the same time complementing wear resistance. In this way, glassy carbon exhibits the wear resistance and heat resistance of a solid lubricant, and molybdenum disulfide and tungsten fluoride exhibit low friction properties.

As a result, it is possible to provide a solid lubricant that exhibits a certain level of wear resistance and heat resistance using glassy carbon, and at the same time can achieve further improvement in low friction properties at the same level using molybdenum disulfide or tungsten disulfide. .

First Example A powder or lump of molybdenum disulfide (or tungsten disulfide) and a phenol resin (or furan resin) were mixed into the former 9
9.9-0. The latter 0.1-99.9W for lwt%
t% of the latter while melting, the mixture is cured until uniformly dispersed, and fired at about 1000°C (a range of about 600 to 2000°C is possible) in a nitrogen stream. This was ground into a powdered solid lubricant.

Second Example A mixture similar to the above is molded into a desired shape using a mold, molded into a bearing as an example, hardened, fired in the same manner as above, and then sintered to form a predetermined shape. We obtained a tangible product, an example of which is a bearing as a part.

Third Example Various synthetic resin materials and the powdered solid lubricant of the first example were mixed and molded while heating to obtain tangible products.

Fourth example molten gold 1j! GO. About 59 wt % of the powdered solid lubricant of the first example were mixed together until uniform, then molded and hardened to obtain a tangible product.

Fifth embodiment: 0.1 to about 50 wt% of metal powder or ceramic powder and about 50 to 99.9 wt% of the powdered solid lubricant of the first embodiment
The mixture was mixed until uniform, molded, hardened, and sintered to obtain a tangible product.

In all of the above examples, low friction properties were exhibited that were superior to the lII friction properties of glassy carbon alone.

(Effects of the Invention) According to the present invention, molybdenum disulfide. Or a powdered solid lubricant with tungsten disulfide as the core and coated with glassy carbon, a solid lubricant as a tangible product obtained by molding and sintering this, the above powdered solid lubricant and a synthetic resin or metal material. A solid lubricant can be obtained as a tangible product by mixing and molding, or a solid lubricant as a tangible product can be obtained by mixing the powdered solid lubricant with metals and ceramics and molding and sintering the mixture.

Molybdenum disulfide or tungsten disulfide, which has excellent low friction properties, is coated with glassy carbon that has good wettability. It is possible to mix without sacrificing the strength of the product. Additionally, it can be mixed with synthetic resins, metals, ceramics, etc. at high mixing ratios.

Furthermore, there are no restrictions on the size of the particles or lumps of molybdenum disulfide or tungsten disulfide that are mixed.

For such solid lubricants, glassy carbon guarantees a certain level of wear resistance and heat resistance, and during use, the surface glassy carbon wears out due to loads above a certain pressure. As a result, a part of the molybdenum disulfide or tungsten disulfide particles are exposed, so it can exhibit superior low friction properties compared to the friction properties of glassy carbon alone, and is preferably applied to low friction parts. becomes. For example, metals, ceramics,
Achieves remarkable improvement in low friction properties in synthetic resins. In addition, in the case of a low load, the low abrasion properties of glassy carbon are exhibited.

Furthermore, by mixing the above-mentioned two materials, it is possible to realize improvements in wear resistance and low friction, especially under high loads.

Claims (1)

[Claims] A solid lubricant consisting of molybdenum disulfide or tungsten disulfide coated with glassy carbon.