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Short aramid fibres improve wear resistance
Vol. 18,
No. 7, Page 4
are undoubtedly a success story, being the cause of a revolution in aerospace design in the twenty years they have existed. Recently fine ceramic fibres have appeared, capable of being woven and withstanding temperatures in excess of 1OOO'C. Fibres are produced from many different materials and with different dimensions but can be defined as: long fine filaments of matter with diameters generally of the order of ten microns and aspect ratios of length to diameter of a hundred or more. This paper is summarised in the 28 May, 1988 issue of"Plastics & Rubber Weekly."
SRORT ARAWD FIBRES IMPROVE WEAB R~IST~CE
The reinforcement of nylon 66 and PPS polymers with short aramid fibres improves the wear resistance, and mechanical properties, and also increases the upper-use temperature. One very important fibre characteristic that distinguishes aramid from glass and carbon fibres is its lack of notch sensitivity. Aramid fibre is inherently very tough and bends without breaking. This toughness is the source of wear resistance. In contrast, glass fibre is brittle and breaks easily into short, abrasive particles that are detrimental to mating surfaces and to the matrix itself. This causes severe galling of the metal counter surface and high wear rates for brittle polymers such as polyphenylene sulphide. Among laboratory wear tests of plastics, the most common is the thrust washer test described in ASTM D3702. It generates wear information for a material based on area contact, not line or point contact as needed in some bearing applications. The thrust washer test is regarded as one of the most effective ways to define the true material characteristics in wear. This article is based upon tests carried out by Du Pont & Co.
Mod. Plast. Int., 1988,
GLASS
REINFORCED PI!3
INJECTION ALDER
POLYMILRS
28,
(Mar.),
231-233
In order for fibre reinforcements in thermoplastics to be as effect ive as possible, the fibres must be firmly bonded to the matrix Using carresin and fibre length should be as long as possible. bon fibres that were specially treated to promote adhesion to polycarbonate, an investigation was conducted to determine the physical properties attainable when the fibre-matrix mixture is It was found processed directly in an injection moulding machine. that higher values for tensile and flexural strength were attained in comparison with a commercially available, compounded material
Kunststoffe, 198, ADDITIVES FOR
(Apr.), 67
The results of a study on the influence of the reinforcing fibre on the behaviour of the fibre/matrix composite are described in this article, and the likely trends in development are also discussed.
Kunststoffe, 1988,
OF CABBON-FIBRERE~~R~~ POLYCARBONATE
I@,
78,
(Apr.),
308-311
Cont./......
o 19lWEbevierScience PublishemLtd., Englmd./88M).OO + 2.20 No part of this publication may be reproduced, stored in a retrieval system. or transmitted by any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the publishers (Readers in the U.S.A. - please see special regulations listed on back cover.)
No. 7, Page 4
are undoubtedly a success story, being the cause of a revolution in aerospace design in the twenty years they have existed. Recently fine ceramic fibres have appeared, capable of being woven and withstanding temperatures in excess of 1OOO'C. Fibres are produced from many different materials and with different dimensions but can be defined as: long fine filaments of matter with diameters generally of the order of ten microns and aspect ratios of length to diameter of a hundred or more. This paper is summarised in the 28 May, 1988 issue of"Plastics & Rubber Weekly."
SRORT ARAWD FIBRES IMPROVE WEAB R~IST~CE
The reinforcement of nylon 66 and PPS polymers with short aramid fibres improves the wear resistance, and mechanical properties, and also increases the upper-use temperature. One very important fibre characteristic that distinguishes aramid from glass and carbon fibres is its lack of notch sensitivity. Aramid fibre is inherently very tough and bends without breaking. This toughness is the source of wear resistance. In contrast, glass fibre is brittle and breaks easily into short, abrasive particles that are detrimental to mating surfaces and to the matrix itself. This causes severe galling of the metal counter surface and high wear rates for brittle polymers such as polyphenylene sulphide. Among laboratory wear tests of plastics, the most common is the thrust washer test described in ASTM D3702. It generates wear information for a material based on area contact, not line or point contact as needed in some bearing applications. The thrust washer test is regarded as one of the most effective ways to define the true material characteristics in wear. This article is based upon tests carried out by Du Pont & Co.
Mod. Plast. Int., 1988,
GLASS
REINFORCED PI!3
INJECTION ALDER
POLYMILRS
28,
(Mar.),
231-233
In order for fibre reinforcements in thermoplastics to be as effect ive as possible, the fibres must be firmly bonded to the matrix Using carresin and fibre length should be as long as possible. bon fibres that were specially treated to promote adhesion to polycarbonate, an investigation was conducted to determine the physical properties attainable when the fibre-matrix mixture is It was found processed directly in an injection moulding machine. that higher values for tensile and flexural strength were attained in comparison with a commercially available, compounded material
Kunststoffe, 198, ADDITIVES FOR
(Apr.), 67
The results of a study on the influence of the reinforcing fibre on the behaviour of the fibre/matrix composite are described in this article, and the likely trends in development are also discussed.
Kunststoffe, 1988,
OF CABBON-FIBRERE~~R~~ POLYCARBONATE
I@,
78,
(Apr.),
308-311
Cont./......
o 19lWEbevierScience PublishemLtd., Englmd./88M).OO + 2.20 No part of this publication may be reproduced, stored in a retrieval system. or transmitted by any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the publishers (Readers in the U.S.A. - please see special regulations listed on back cover.)