Download e-book for iPad: High Temperature Ceramic Matrix Composites by Walter Krenkel, Roger Naslain, Hartmut Schneider

By Walter Krenkel, Roger Naslain, Hartmut Schneider

ISBN-10: 3527303200

ISBN-13: 9783527303205

A survey of the present kingdom of MMCs as engineering and sensible fabrics, making this of maximum worth to all fabrics scientists and engineers looking in-depth heritage info at the potentials for those fabrics in examine, improvement and layout engineering.

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Additional resources for High Temperature Ceramic Matrix Composites

Example text

It is possible, for example, that a preform before infiltration is flushed with gas, which can lead to a change in the oxygen partial pressure. 32 shows the dependence of the wetting angle in the system Al2O3/pure aluminum on the temperature for two oxygen partial pressures [40]. For high partial pressures of oxygen high wetting angles occur at low temperatures. Only when starting from temperatures above 1150 K does the value for the wetting angle decrease to that for a low oxygen partial pressure.

Fig. 20 19 20 1 Basics of Metal Matrix Composites Influence of the fiber length and fiber orientation on the reinforcement effect óC/óM for a composite material with 20 vol. % aluminum oxide fibers for different matrix yield strengths [29]. Fig. 21 strengths of the nonreinforced matrix (80 MPa and 115 MPa) [29]. Although for the calculations only models with simplified boundary conditions were used, they show the objective for the production and processing of such composite materials. A goal is an optimal alignment of the fibers with the retention of a long fiber length.

1. 40 describes this connection using the example of the adhesive strength of a solidified aluminum melt dropped onto a substrate as a function of the wetting angle, determined by the droplet shear test. For small edge angles high adhesive strength values with a failure by shearing result. At larger angles the adhesive strength decreases and the failure only occurs under tension. In systems with good wettability reactions play a substantial role. The adhesion in composite systems can be improved by reaction.

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High Temperature Ceramic Matrix Composites by Walter Krenkel, Roger Naslain, Hartmut Schneider


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