| 摘要 |
A two-layer friction bearing material (I) comprises (A) a plastic friction layer (1) with a polyamide matrix containing 3-40 vol.% PTFE; and (B) a base material. Also claimed are processes for the production of (I). Preferably layer (1) consists of a polyamide (PA) 11 or 12 matrix with 10-20 vol.% PTFE and no lead, optionally modified with additives such as calcium carbonate, mica, polyethylene, wax, mineral oil, synthetic oil, calcium fluoride, molybdenum sulphide, graphite, bronze powder and/or fibres, preferably with a total additive concentration of 2-40 wt%. Base (B) (material 2) consists of (B1) metal, preferably sub-eutectoid steel such as DIN 1624 steel, Grade St3 or St4, with a 10-25 mu protective layer (3) of PA 11 or PA 12 on the side opposite layer (1), or (B2) bronze, brass, aluminium or a not very reactive copper alloy, or (B3) a woven fabric (5), preferably made of carbon, glass, aramid or metal fibres.
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