Abstract
Cutsomary, friction plate of friction iron props in mines have been made of aluminium alloy. They have ideal characteristic, but the specific corrosions of aluminium alloy occures hard in Japanease mines that have much salt and are high moisture, moreover they catch fire when props are pulled out. Hence, 18-8 stainless steel, 18-8 stainless steel metalliconed zinc and hard copper alloy have been researched, but their characteristics are worse than aluminium alloy's. Namely the iron props that use 18-8 stainless steel friction plate have rigidity, that use copper alloy friction plate have contructibility, wherefore the great factor that exert an influence upon decent characteristic is young's modulus and friction factor. The friction factor between iron props and friction plate, and constricting pressure of cotter control the load that decent of iron props starts. If constricting pressure of cotter is constant, friction factor will exert an influence upon a clamping load. The other necessary material characteristics for friction plate are that plate don't melt and stick to iron props at high pressure, anticorrosion, antiflash, compressive strength and wear resistivity. Generally, the young's modulus of metal sintered products is influenced by its density and the amount of the second phase of its materials. In the experiment, we mixed iron powder and copper powder at excess rate and made sintering alloys, for making to be decreased the young's modulus and a friction factor of iron alloy. By measuring their young's modulus and friction factor (at high pressure), we selected the composition that indicated the near property to aluminium alloy. We use it as friction plate of iron props in a mine practically and find that it indicaded the ideal characteristic. Hence we report that result.
