The friction and wear characteristics of various Y-TZP-sialon sliding systems were examined. These systems consisted of a Y-TZP sphere reciprocating against various sialon plates. The sialons differed in phase content and composition. They range from cz-sialons to 13-sialons and include 0~-13 composites. The length of the wear tracks was 10 mm, the loads used were 2 and 8 N, the frequencies 1,4 and 8 Hz and the humidity was controlled by flushing with dry nitrogen. The tests were continued for 8, 24 and 72 h at room temperature. The total vertical displacement and the friction coefficient were measured continuously and sampled. Various additional measurements were performed after each test and the worn surfaces were observed microscopically. It was concluded that the :z-J3 composites show less wear than the 0~-and 13-sialons. It was also concluded that the amount of wear increases approximately linearly with load and increases significantly more than linearly with frequency. A wear mechanism was derived incorporating the measured data and the observations.
The fl'-sialons (Si6_zAIzOzNs_z) can be produced by carbothermal reduction of kaolin. The reaction mechanism of the sialon formation has been studied by several methods. Firstly, the composition of the reaction product is determined by XRD as function of the reaction time at 1400 and 1500 ~ C. The influence of additives, pellet size, nitrogen flow and clay type on the reaction is studied. Secondly, the carbon monoxide leaving the furnace is monitored. By studying the changes in carbon monoxide output as a function of the above-mentioned parameters a better understanding of the reaction mechanism has been obtained.
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