Liferature survey The literature survey is prepared by M.R. Alexander, C. Barran, J. Collins, M.D. Glendenning and A.J. Hosty, University of Shefield, UK . - - .

CVD Sic/AI composites produced by a vacuum suction casting process Kun, Y., Dollhopf, V. and Kochendorfer, R. Composites Science and Technology Vol 46 No 1 (1993) pp I-6

A technique has been devised to manufacture composites of aluminium reinforced with chemical vapour deposition (CVD) Sic filaments. Three types of filament were tested and the wettability and degradation of the filaments during liquid infiltration was studied. Measurements were also made of the mechani- cal properties of the composite rods. Good wettability allowed low infiltration tempera- tures to be used. Uncoated SIC filaments showed severe degradation when exposed to molten aluminium whereas SCS filaments showed a good protective response.

The elfect of heat treatment on the properties of PEEK and APC2 Folkes, M.J., Kalay, G. and Ankara, A. Composites Science and Technology Vol 46 No I (1993) pp 77-83

A systematic study has been made of the effect

of various heat treatments on the properties of PEEK and APC2. X-ray diffraction and dynamic mechanical thermal analysis (DMTA) have produced T, values considerably higher than is generally reported. It is also shown that tan 6 for quenched APC2 is also higher than that for slowly cooled materials. This is concluded to be due to poor fibre/matrix adhesion.

Measurement of yarn shape and nesting in plain-weave composites Yurgartis, S.W., Morey, K. and Jortner, J. Composites Science and Technology Vol 46 No I (1993) pp 39-50

This paper aims to develop methods of quantifying yarn shape. Two measures of yarn shape and one of cloth nesting are presented. These are inclination angle, crimp angle and angle match. Best-fit sinusoidal descriptions of yarn shape are also obtained. The measure- ments are made using a computer-aided image

processing technique for greater reliability and speed. Examples are given for carbon/carbon composites reinforced with plain weave cloth. It is shown that sinusoidal descriptions of yarn shape may not be correct and that yarn shape can change significantly during processing.

A study of the elfect of forming temperature on the mechanical bebavionr of carbon- fibre/‘PEEK composites Jar, P.-Y., Mulone, R., Davies, P. and Kausch, H.-H. Composiles Science and Technology Vol46 No 1 (1993) pp 7-19

A study is made of the effect of forming temperature on the mechanical properties of carbon fibre/PEEK composites. Various configurations and properties are tested of material formed over the range of 366440°C. It is seen that, by forming at a higher temperature than recommended (38o”C), improvements in mechanical properties can be made. It is suggested that the improvements in the mechanical properties is due to increased interfacial strength between fibre and matrix.

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60 Composites Manufacturing No. 1 1993