By J. G. Wurm (auth.), F. L. Riley (eds.)
This quantity comprises the court cases of the 2d ecu Symposium on Engineering Ceramics held in London, 23-24 November 1987. The assembly used to be attended via virtually two hundred scientists and engineers, essentially drawn from undefined, and the periods have been chaired via Mr Eric Briscoe, prior President of the Institute of Ceramics. Very powerful symposium corporation was once supplied through IBC Technical prone Ltd. The engineering ceramics are a category of fabrics which has over a few 50 years came across well-established functions according to the fabrics' chemical balance and put on resistance. The final twenty years have obvious intensified efforts to increase purposes for those fabrics into components commonly occupied by means of metals, yet during which the common steel weaknesses of wear and tear, and of hot temperature creep and oxidation, at the moment are growing major difficulties. those efforts have, in spite of the fact that, in lots of situations been undermined at the one hand through the inherent ceramic weaknesses of brittleness and flaw sensitivity, and at the different via an insufficient knowing, and regulate, of the fundamental ceramic fabrication methods required for the inexpensive mass construction of quite advanced elements. The confident result of the efforts of the final two decades were the advance of a big new crew of ceramic fabrics believed to own intrinsic mechanical estate benefits, of which the transformation toughened zirconias, and the ceramic matrix composites are sturdy examples, including enhanced powder creation equipment and powder shaping processes.
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Two tribological configurations can be used: (i) ball-on-disc configuration, which minimizes the trapping of debris; 22 Philippe Boch. Jean-Claude Glandus. F. ,L.. ---1. =CI-glass tube Furnace Sleeve Guided rod Torque cell Housing Load 9-t-~;a-+. 8 --++hoiff-+, I 7 --+++"~rH- Fig. 4. Schematic of the high temperature tribometer. (ii) a disc-on-disc configuration, which maximizes the trapping of debris. The friction velocity can vary from 0·01 m S-l to more than 1·2 m S-l and the load can vary from 5 N to 10 N for the balloon-disc configuration and from 200 N to 10 000 N in the disc-on-disc configuration.
O,1",/s s·lkm Measurements Material pairings ~ sleel sleel kit 1 kit 2 alumina kll 3 kit' alumina • Friction farce • Wear ( sys tem. ball. disc) • Wear surfaces ( SfM. pralilametry ) Fig. 3. Sliding wear test system with specified parameters noted (from Ref. II). the track diameter). The test atmosphere was air, 50 ± 10% relative humidity. The test temperature was 23 ± 10 C. No lubricant was used. The operating variables were continuous unidirectional sliding at a velocity of 0·1 m s-', a normal10ad of 10 N, a sliding distance of I km, and a number of replicate tests of 3-5.
Multilaboratory tribotesting: results from the Versailles Advanced Materials and Standards Programme on wear test methods, Wear, 114 (1987) 109-30. 12. ASTM Committee G2 Research Reports on Standards G77 and G83, Philadelphia, USA, ASTM. 13. Study of the tribology of technical ceramics based on SiC. Si3N4 , and zr02 as a function of temperature and environment, Research action in the 30 14. 15. 16. 17. 18. 19. 20. 21. Philippe Boch, Jean-Claude Glandus, F. Platon EURAM programme, ENSCI Limoges, INSA Villeurbanne, Ceramiques et Composites Bazet, and University of Surrey.
2nd European Symposium on Engineering Ceramics by J. G. Wurm (auth.), F. L. Riley (eds.)