Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1982-01-26
1984-03-06
Jacobs, Lewis T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524496, C08K 334
Patent
active
044355386
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to compositions for the preparation of a carbonaceous base for use in the manufacture of siliconized antifriction materials.
BACKGROUND OF THE INVENTION
Known in the art is a composition for the preparation of a carbonaceous base employed in the manufacture of siliconized antifriction materials. This composition comprises a powder-like carbonaceous filler a petroleum coke and a binder-phenolic thermosetting resin such as phenolformaldehyde resin (cf. British Pat. No. 1,394,106 Cl. C 01 B 31/36, published May 14, 1975).
However, siliconized antifriction materials based on the above-mentioned composition have insufficient mechanical strength (compression strength not more than 4,500 kgf/cm.sup.2) and resilience (not more than 3 kgf.cm/cm.sup.2), as well as a low wear-resistance in liquid media containing abrasive impurities and in bulk materials (the wear rate is 0.055 mm/1.000 hrs.). Furthermore, these antifriction materials are insufficiently resistant to wear in agressive liquids such as solutions of acids and alkalis (the rate of wear is 0.129 mm/1,000 hrs).
DISCLOSURE OF THE INVENTION
The present invention is directed to the provision of such a composition for the preparation of a carbonaceous base to be used in the manufacture of siliconized antifriction materials with improved mechanical strength characteristics and a low rate of wear in liquid media containing abrasive matter, in neutral and agressive liquid media, in fluid media as well.
This object is accomplished by a composition for the preparation of a carbonaceous base to be used in the manufacture of antifriction materials consisting of a carbonaceous filler, phenolformaldehyde resin and a devitrified glass material (sital) having the following components, percent by weight: Al.sub.2 O.sub.3 --10-12, CaO--12-14, MgO--9-11, Na.sub.2 O--5-6, SiO.sub.2 --the balance: the composition contains the ingredients in the following proportions, percent by weight:
______________________________________ carbonaceous filler 65 to 85
phenolformaldehyde resin
12 to 30
sital 3 to 5.
As the carbonaceous filler in the composition according to the present invention use can be made of a carbonaceous powder with a particle size of from 0.01 to 0.5 mm.
It is also advisable to use carbon fibres as the carbonaceous filler.
Furthermore, as the carbonaceous filler in the composition according to the present invention use can be made of a mixture of carbon fibres with carbon powder at a weight ratio therebetween of from 1:1 to 1:5 respectively.
The above-specified proportions of the ingredients in the composition according to the present invention is optimal and ensures the best characteristics of siliconized antifriction materials.
The composition according to the present invention makes it possible to obtain siliconized antifriction materials having an increased wear-resistance (wear rate is 0.010 to 0.031 mm/1,000 hrs) which in turn enables the use of these antifriction materials in friction assemblies operating in neutral and aggressive liquid media, liquid media with abrasive matter and in fluid media as well.
The pressure of sital in the composition according to the present invention contributes to a higher wear-resistance of siliconized antifriction materials in aggressive liquid media.
Siliconized antifriction materials produced from the composition of the above-specified formulation have improved mechanical strength characteristics: compression strength is 4,500 to 5,500 kgf/cm.sup.2, resilience -2.2-22.0 kgf.cm/cm.sup.2.
BEST MODE FOR CARRYING OUT THE INVENTION
The composition according to the present invention is prepared by mixing a carbonaceous filler, phenolformaldehyde resin and sital in the predetermined proportions.
As the carbonaceous filler in the composition according to the present invention use is made of a carbon powder such as a powder of artificial graphite, coal, coke (petroleum, coal-tar, phenolic), as well as a mixture of carbon powders in any proportions thereof. Fur
REFERENCES:
patent: 2581301 (1952-01-01), Saywell
patent: 3969124 (1976-07-01), Stewart
patent: 4316834 (1982-02-01), Ueda et al.
Koshelev Jury I.
Kosova Lyana I.
Kostikov Valery I.
Tarabanov Alexandr S.
Tatievskaya Elena M.
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