Investigation of friction and wear in certain polymers

Investigation of friction and wear in certain polymers

LITERATURE 246 AND CURRENT EVENTS and on the structure of the material, and also their anti-friction properties and abrasion resistance. Wear of...

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LITERATURE

246

AND

CURRENT

EVENTS

and on the structure of the material, and also their anti-friction properties and abrasion resistance.

Wear of Glass-fibre Reinforced Plastics Rubbed with Loose Abrasive. V. N. Vinogradov et al., Soviet Plastics, London, (6) (1965) 40-43; 5 figs., 2 refs.

An

The wear resistance of glass-fibre reinforced plastics of various structures prepared on the basis of BF-4 adhesive when they are rubbed with loose abrasive is higher than that of materials of analogous structures based on PN-I resin. Glass-fibre reinforced plastics based on unidirectional glass fibre are more resistant to wear than those based on other forms of glass filler.

Anti-friction Composition Based on FT-1 Organophosphorus Thiokol and Epoxy Resin. A. D. Kurmaev, Soviet Plastics, London, (8) (1965) 36-38; 3 figs., z tables, IO refs.

Together with ETS-52 and ETS-52-2 thiokolepoxy, anti-friction compositions, the composition ETS-52-3, based on organophosphorus thiokol and epoxy resin, using maleic anhydride and orthophosphoric acid as hardeners, merits attention. ETS-52-3 has a low coefficient of friction and high mechanical properties. InfIuence of Low Temperatures on the Antifriction Properties of Polycaprolactam. Yu. A. Evdokimov et al., Soviet Plastics, London, (9) (1965) 45-46; 5 figs., 6 refs. This investigation relates to the friction propperties of Kapron on steel with and without lubricants at zo-25’C and -50°C with various combinations of pressures and rates of slip. Anti-friction Properties of some Plastics. 0. F. Degtyareva et al., Soviet Plastics, London, (6) (1965) 63-66; 5 figs., 3 tables. Kapron (a Soviet nylon-6) is shown to have the best anti-friction properties of a number of plastics tested, and is also the least subject to wear : it can therefore be used for bushes in bearings. With inadequate lubrication it is best to use Kapron with the addition of 35% graphite. Kapron bushes, in contrast, for example, with bronze bushes, by wearing out themselves cause little wear of the shaft. This is a great advantage since it is simpler to replace bushes than a shaft. Investigation

of

Friction

and

Certain Polymers. V. P. Mitrovich, Soviet Plastics, (1965) 64-65; 4 figs., 4 refs.

Wear

in

London,

(8)

Polypropylene, polyformaldehyde and a number of Soviet polyamides were investigated in a couple with steel. Lubrication was by means of mineral oil, under conditions approximating to those of bearings of the same materials, where heating of the friction part is possible. Wear Resistance of Polyformaldehyde in Plain Bearings. V. N. Kestelman, D. 1. Feldman and N. Ya. Kestelman, Soviet Plastics, London, (7) (1965) 67-68; 4 figs., 3 refs. Tests on laboratory machines, and road and bench tests of car-suspension units, show that polyformaldehyde bearings are 3 to 4 times as wear resistant as nylon-6 and I. 5 to z times as wear resistant as metal-ceramic bearings. W’eav, g (1966)

239-247

Investigation of the Corrosion- and Erosionresistance of SNP Plastic to Coke-chemical By-products. L. P. Vladimirov et al., Soviet Plastics, London.

(6) (1965)

53-55;

4 figs.

The investigation relates to the use of SNP (a combination of a styrene-acrylonitrile copolymer and nitrile rubber) as a lining for ducts and containers in contact with acid and alkaline solutions and dry and moist hydrogen sulphide. 7. TESTING Friction Machine for Studying the Lubricating Power of Oil Mists. M. D. Bezborod’ko and 1. I. Solomenko, Ind. Lab., 30 (5) (May 1964) 773-774. (Transl. Zavod. Lab., 30 (5) (1964) 616-617 by Instru-

ment Society of America, Pittsburgh, Pa.) For abstract see A$$. Mech. Rev., 18 (II) (1965)

949.

Study of the Radiometric Method and Use of the Liquid-scintillation Technique for Toolwear Determination. G. F. Wilson and W. D. Mcllcnry, /. Eng. Ind., I (Feb. 1965) 47-52 (Trans. ASME, 87 A).

For abstract (1965)

see Appl.

Mech.

Rev.,

18

(7)

608.

Application of Radioactive Labelling to Wear Studies on Piston Rings and Cylinders in a Diesel Engine. (in German) J, Pirs, A. Filip and A. KostiC, [email protected]%&;!, 7 (4) (1965) 123-128: 8 figs., I table, 12

The design and mode of operation of an arrangement for wear studies with radioactive plugs are described, and comparative wear tests on piston rings and cylinders in a Diesel engine are reported. The results obtained are also discussed with reference to the results of metallographic structure studies on materials of piston rings and cylinders made from grey cast iron. BOOK ness.

: Measuring

ASTM

Spec.

pp.

Tech.

; price: $ 6.

Road-surface Publ.

No. 366,

Slipperi1965,

112