IMPLEMENTATION OF A STANDARD TEST METHOD FOR ABRASION RESISTANCE OF REFRACTORY MATERIALS FOR TESTING AT ELEVATED TEMPERATURES

摘要

ASTM-C 704 and ISO 16282 are commonly in use to determine the abrasion resistance of refractory ceramic surfaces against highly accelerated particles at room temperature (RT). To facilitate the development of abrasion-resistant high-temperature refractory materials, the test setup was transferred to elevated temperatures at conditions as close as possible as specified in the standards. The development is based on six years of experience on a testing device for the industry. For the implementation of test conditions up to 1400 °C the standard setup is supplemented with a ring shaped domestic gas burner in which the coaxial abrasion nozzle made of refractory silica glass is situated. The flame is focussed into the accelerating pressured air and they mix with each other. Prior to the test it is necessary and possible to adjust the temperature of the flame mixed with the compressed air stream. Thereafter the SiC particles are fed and heated to test temperature. The device also allows testing samples at RT with best correlation to the standard facility. The change of abrasion as a function of temperature is highly reproducible and is consistent with the tests performed at RT. By now, the method is well accepted by the industry. The test setup is easy to construct and may therefore be adopted by any institute. The method is capable to be implemented in the international standardisation system in the near future. This paper discusses preconditions which are necessary to provide reliable results and reproducible results for abrasion wear at elevated temperatures. Recent perceptions derived from inter laboratory tests at room temperature are transferred to the principle test setup at elevated temperatures.