COMPATIBILITY OF CALCIUM-SILICATE INSULATING BOARD (JOHNS-MANVILLE PRODUCT HEAT-TREATED MARIMET-45) WITH ENGINEERING ALLOYS AT 1100 TO 1600℉

摘要

Calcium-silicate insulating board (Johns-Manville product "heat-treated Marimet-45") vas tested as a candidate material for spacer bushings which support electric clamshell heaters on high-temperature piping systems. Compatibility tests were made in typical piping configurations at temperatures from 1100 to l600℉ . No detrimental effects were observed on three metal alloys after 5700 hr exposure to calcium silicate at high temperature. It was concluded that the test material is suitable for use as support spacers for clamshell heaters. The material appears useful for other applications where a readily machinable, load-bearing, electrical or thermal insulation must, be in contact with the high-temperature alloys which were tested. The oxidation characteristics of the three alloys were noted at various positions along the tubes.