| 摘要 |
<p>A bearing brass (see Group XXXIV), is of porous molybdenum and is coated with molybdenum disulphide over the bearing surface and to a lesser extent within the pores. The brass is placed in a gas-tight container in a furnace, and the container is flushed with nitrogen for about thirty minutes to remove air. The brass is then heated to a temperature of about 800 DEG C. and the nitrogen in the container is replaced by dry hydrogen sulphide gas which is circulated for about ten minutes with a gas flow of about 500 c.c./min. for each square inch of molybdenum surface to be sulphided. Gas flow of hydrogen sulphide is then reduced to about 30 c.c./min. per square inch of surface to be treated, and maintained for another twenty minutes. The container is then flushed with nitrogen and allowed to cool to room temperature.</p> |
