Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1982-01-26
1983-12-13
Lusignan, Michael R.
Stock material or miscellaneous articles
Composite
Of silicon containing
264 60, 264 65, 427294, 427314, 427355, 427401, B32B 906, B32B 1504, B05D 300, B05D 302
Patent
active
044205392
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the art of manufacture of structural antifriction materials.
BACKGROUND OF THE INVENTION
Known in the art is a process for the production of an antifriction material by impregnating a carbonaceous base with molten copper and silver. The process comprises placing the carbonaceous base and the metals in the solid state in an electroconducting vessel and heating, by means of electric current to the melting temperature of the metals (cf. French Pat. No. 1,368,129 Cl. C 04 B, published June 31, 1964).
Using this process it is, however, not always possible to obtain an antifriction material having a uniform degree of impregnation of the carbonaceous base which results in substantial non-uniformity of its properties relative to the entire volume thereof.
Also known in the art is a process for the production of antifriction materials by impregnating a carbonaceous base having a density of from 1.68 to 1.79 g/cm.sup.3 with metals or alloys thereof whose melting point lies within the range of from 200.degree. to 1,000.degree. C. in an autoclave under an inert gas pressure (cf. U.S. Pat. No. 3,619,430 Cl. 264-29, published Nov. 9, 1971).
The antifriction materials produced by this process have insufficient wear-resistance (wear rate is 0.8-1.0 .mu.m/hr) and a low mechanical strength (compression strength is 2,300 kgf/cm.sup.2), wherefore it is substantially impossible to use these materials in friction units operating in liquid media containing abrasive matter and in fluid (bulk) materials.
SUMMARY OF THE INVENTION
The present invention is directed to the provision, in a process for the production of antifriction materials comprising impregnation of a carbonaceous base with metals or alloys thereof, of such a carbonaceous base and such conditions for the treatment thereof which would enable the production of antifriction materials with improved mechanical strength characteristics and a low wear rate.
This object is accomplished by a process for the production of antifriction materials comprising impregnation of a carbonaceous base with metals or alloys thereof, wherein according to the present invention as the carbonaceous base use is made of a siliconized graphite consisting of 5 to 25% by weight of silicon, 25 to 55% by weight of silicon carbide, carbon being the balance, and prior to the impregnation the siliconized graphite is thermally treated in a vacuum of from 10.sup.-1 to 10.sup.-3 mm Hg at a temperature within the range of from 1,500.degree. to 2,000.degree. C. for a period of from 15 to 60 minutes.
The process according to the present invention makes it possible to obtain antifriction materials with increased mechanical strength characteristics (compression strength is as high as 4,300 kgf/cm.sup.2) and a high wear resistance (wear rate is as low as 0.3 .mu.m/hr) which, in turn, enables the use of these antifriction materials in friction units operating in liquid media containing abrasive matter and in bulk materials. The process is simple, makes use of standard equipment, is non-hazardous and highly efficient. All the process parameters during the manufacture of antifriction materials can be easily and reliably controlled.
BEST MODE FOR CARRYING-OUT THE INVENTION
The process for the production of antifriction materials according to the present invention is effected in the following manner.
As the starting carbonaceous base for impregnation with metals or alloys thereof use is made of a siliconized graphite. For the production of siliconized graphite use can be made of porous carbon blanks calcined (at a temperature of from 700.degree. to 1,000.degree. C.) or graphitized (at a temperature of from 2,000.degree. to 3,000.degree. C.), obtained from various carbonaceous fillers and binders. For example, use can be made of carbonaceous porous blanks based on the following carbonaceous fillers: petroleum and coal cokes, artificial and naturally-occurring graphites, carbon fabrics and fibres, as well as the following binders: coal-tar pitches, petr
REFERENCES:
patent: 3619430 (1971-11-01), Hiratsuka et al.
patent: 3850668 (1974-11-01), Heffer
patent: 3949804 (1976-04-01), Kaneko et al.
patent: 4221831 (1980-09-01), Kostikov et al.
Filimonov Evgeny F.
Khomenko Alexandr A.
Koshelev Jury I.
Kostikov Valery I.
Telegin Vasily D.
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